ENPPI Pressure Vessels

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CONTENTS PAGE

1.0

SCOPE

4

2.0

REFERENCE DOCUMENTS

4

3.0

ORDER OF PRECEDENCE

5

4.0

DEFINITIONS

6

5.0

MECHANICAL DESIGN

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FABRICATION

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APPENDICES APPENDIX 1.0:

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STANDARD DETAILS

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PRESSURE VESSELS SPECIFICATION

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SCOPE

This specification together with equipment data sheet supplements the requirements of the reference code for the design, fabrication, inspection and testing of metallic pressure vessels. It also covers the vessel attachments and appurtenances. 2.0

REFERENCE DOCUMENTS

The reference documents listed below form an integral part of this Specification. 2.1

LAWS & REGULATIONS

LAWS AND REGULATION REFERENCES IN THIS SPECIFICATION ARE ALWAYS REFERRED TO THOSE OF COUNTRY OF EQUIPMENT INSTALLATION. 2.2

CODES, STANDARDS, RECOMMENDED PRACTICES & GUIDELINES

ASME Sec. VIII Div. Div. 1 ASME Sec. VIII Div. 2 ASME Sec. II ASME Sec. V ASME Sec. IX ASME B16.5 ASME B16.9 ASME B16.11 ASME B16.20 ASME B16.21 ASME B16.25 ASME B36.10M ASME B16.47 UBC ASCE 7 WRC 107 WRC 537

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WRC 297

Rules for construction of Pressure Vessels. Rules for for construction construction of of Pressure Pressure Vessels, Vessels, Alternative rules. rules. Boiler & Pressure Vessel Code – Materials. Boiler & Pressure Vessel Code – Non-destructive Examination Boiler & Pressure Pressure Vessel Code - Welding, Brazing, and Fusing Qualifications. Pipe Flanges and Flanged Fittings. Factory-made Wrought steel Butt welding Fittings. Forged Fittings, Socket-Welding and Threaded. Metallic gaskets for pipe flanges and ring Joint and spiral wound. Non-metallic Flat and Jacketed Gaskets for Pipe Flanges. Butt-Welding Ends. Welded and Seamless Wrought Steel Pipe. Large Diameter Steel Flanges. Uniform Building Code. Minimum Design Loads in Buildings and other Structures. Local Stresses in Spherical and Cylindrical Shells due to External Loadings. Precision equations and enhanced diagrams for local stresses in spherical and cylindrical shells due to external loadings for implementation of WRC Bulletin 107. Local stresses in cylindrical shells due to external loadings on nozzles.

NACE MR0175/ MR0175/ ISO ISO 15156

Petroleum and Natural Gas Industries – Materials for Use in H2S Containing Environment in Oil and Gas Production.

NACE MR 0103 0103

Material Materialss Resistan Resistantt to Sulphide Sulphide Stress Stress Cracking Cracking in corrosiv corrosivee Petroleum Refining Environments. Environments.

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ENPPI SPECIFICATIONS

3750-200-100-003

Tower internals.

3750-200-100-076

Welding Specification.

Unless otherwise stipulated, the applicable version of these documents, including relevant appendices and supplements, is the latest revision published at the EFFECTIVE DATE of the CONTRACT. Codes & Standards equivalent to those referenced herein shall not be substituted without written approval from Enppi.

3.0

ORDER OF PRECEDENCE

In the event of conflicts among the referenced documents above, the order of precedence shall be as follows: a) b) c) d)

The Laws and Regulations. The Equipment Data Sheet(s). The referenced Specifications. The referenced Codes & Standards

Where this specification states no overriding requirements, the referenced Codes and Standards shall apply in full. Any conflicts between this specification and other applicable Specification, Codes and Standards or local applicable laws shall be brought to the attention of Enppi for resolution.

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DEFINITIONS

COMPANY

The Organization which initiate the Project and pay for it.

CUSTOMER

The Organization or person that receives a product.

CUSTOMER REPRESENTATIVE

The Organization or Person duly appointed by the CUSTOMER or COMPANY to act as its representative(s) to supervise and control the job.

INSPECTION

The Conformity evaluation by observation and judgment accompanied as appropriate by measurement, testing or gauging.

MANUFACTURER

The party selected by the CUSTOMER as the Manufacturer for the construction of a pressure vessel in accordance with the rules of the applicable division and who holds an ASME Certificate of Authorization to apply the Code Symbol Stamp.

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MECHANICAL DESIGN LOADS

Vessel shall be designed to the design loads as specified in ASME code Section VIII including pressure load, liquid weight, equipment weight, wind, seismic, operating and test load…etc. The liquid level and specific gravity are given on the vessel data sheet and weir heights are given in the tray specification for vessels with trays. The increased pressure resulting from the liquid load shall be added to the internal design pressure in design code calculation. All pressure parts shall be designed according to applicable design code, the design conditions mentioned in the data sheet and all possible simultaneous application of the following loadings: 

Pressure Load:

the load due to internal or external pressure



Erection Load:

the weight of bare equipment before installation of any removable internal or external attachments.



Empty Load:

the erection weight plus weight of all removable internals and external attachments.

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Operating Load:

the empty weight plus weight of operating liquid in addition to pressure load.

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Hydrostatic Load:

the empty weight plus weight of test water in addition test pressure load.

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Cyclic Loads:

cyclic and dynamic reactions due to pressure or thermal variations, or from equipment mounted on a vessel, and mechanical loadings; if specified in vessel datasheet.

The vessel, its support and fixation bolts shall be designed for the following load combinations:

a. Erection: erection load plus greater of wind and seismic load for erection case. ) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

b. Empty: empty load plus greater of wind and seismic load for empty case. c. Operating: operating load plus greater of wind and seismic load for operating case. d. Hydrostatic: hydrostatic load plus quarter of wind load for hydrostatic case. Effect of thrusts or friction loads from thermal expansion of piping shall be checked. Local stresses from differential thermal expansion between vessel components or between the vessel and its support due to dissimilar material of construction or thermal gradient shall be evaluated.

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Shell, heads and nozzles shall be checked against imposed loads from external piping and external attachments according to WRC 107/537 and WRC 297 or (FEA) finite element analysis. Refer to attached maximum allowable nozzles load table ( Standard Detail-12); unless otherwise superseded by other nozzle loads applicable in the project. The vessel shall be capable, proven by calculations, of field hydrostatic test in the erected position and the induced membrane stress in corroded conditions shall not exceed 90% of the ferritic material ambient yield strength or 90% of the 1% proof stress for austenitic material, unless otherwise required by the applicable code. For establishing the wind pressure in the area of installation, UBC or ASCE 7 shall be used. Unless a detailed analysis is made that includes the actual projected area of each external attachment, the greater of the following shall be used:  

The outside diameter of the vessel or its insulation plus 1220 mm. Vessel outside diameter plus 610 mm plus the outside diameter of the largest pipe and its insulation extending down the vessel.

The projected areas of ladders and platforms shall be added to the total effective projected area, as follows:  

For ladders, 0.6 m2/m of the total equipment height. One platform at intervals of 5 m of the vessel height with an exposed area equal to 2m 2 2 per each, plus one top platform with 3 m .

Tall, relatively slender vertical vessels shall be checked for the deflection at the top end. The allowable top deflection limit is 5 mm per meter height. Anchored guy wires shall not be used to limit the top deflection. All vessels shall be self-supported without benefit of braces and shall be stable with respect to wind induced vibration. Vertical vessels shall be checked for wind-induced vibration (Vortex shedding effects) on the vessel under erection, empty and in operating conditions by the Manufacturer when: The height to diameter ratio H/D is greater than or equal 15 or, when W/HD² < 400 Where: ) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

H is the height of the vessel in meters, including the supports D is the diameter of vessel in meters. (For multi-diameter vessels the diameter shall equal the average diameter of the top third). W is the weight of the vessel in kilograms in both the erected empty and operating conditions. Vessels shall be checked for transportation and erection loads; where significant. They shall be checked for abnormal maintenance loads; where specified.

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MINUMUM THICKNESS 

For cylindrical shell, conical shell sections, conical heads, toriconical heads, ellipsoidal heads and F&D heads: Tcorr = the greater of (0.001D + 2.54) and 5 mm.



For hemispherical heads: Tcorr = the greater of (0.0005D+2.54) and 5 mm. Where: Tcorr = minimum corroded thickness before adding corrosion allowance [mm]. D = inner diameter of the section or the large end of a cone [mm].



Skirt: The minimum skirt thickness shall be as follows:

Vessel Inner Diameter, D

D ≤ 1000 mm

4 mm

1000 mm < D ≤ 2000 mm

6 mm

2000 mm < D ≤ 3000 mm

8 mm

D > 3000 mm



Min. Skirt Thickness

10 mm

Saddles: The minimum thicknesses of saddles plating shall be 6 mm. (refer to Standard Detail 6)



Internals: For non-pressure steel internal piping, at least the thickness of the standard pipe shall be used. For non-pressure alloy piping, at least schedule 10S pipe or from 3 mm plate thickness shall be used. Plate-type flanges 16 mm thick minimum is acceptable for non-pressure piping. No corrosion allowance shall be added to this minimum thickness unless specified on the vessel data sheets.

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The minimum corroded thickness for any internal non-pressure parts such as, fixed internal rings, plates, piping supports, etc., shall be the greatest of 3 mm or thickness required by strength calculation. 

The thickness of external reinforcement pad shall not exceed the thickness of pressure part attached to it.

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LOW TEMPERATURE REQUIREMENTS

Pressure vessels designed in accordance with ASME Section VIII with operating temperature below minus 29 oC, shall be in accordance with the requirements for low temperature operation as specified in the applicable code paragraph pertaining to the type of material of construction. The impact test specimens shall be oriented with the longitudinal axis parallel to the final direction of rolling. The impact test temperature shall be 10oC lower than the lowest temperature to which the vessel may be subjected to during the operating cycle. The acceptance criteria, based on energy absorption of full size specimen shall be as per ASME Section IIA, SA-20 and the applicable paragraph in the ASME Sec VIII code. 5.4

CORROSION ALLOWANCE

The Corrosion Allowance shall be suitable for a 20 years life unless otherwise specified. Minimum Corrosion Allowance of 3.2 mm shall be provided for all carbon and low alloy steel (Materials P-1, P-3, P-4, P-5) pressure containing parts unless otherwise specified on equipment data sheet. The Corrosion Allowance shall be added to carbon steel and low alloy steel beyond applied liners, to each side of partitions. Vessel corrosion allowance shall be applied for each exposed side for non-removable internal parts including any support rings. For Corrosion Allowance on trays refer to Tower Internals Specification. Total Corrosion Allowance of 1.6 mm shall be added to carbon steel and low alloy steel removable internal parts. No Corrosion Allowance shall be added to external bolting, flange faces, or to high alloy and nonferrous parts unless otherwise specified.

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In case that alloy material is proposed rather than the provision of the corrosion allowance on internal parts. A Formal written approval must be obtained from the Customer. For fillet and seal welds on internal attachments, the corrosion allowance shall be added to the required throat thickness. For jacketed vessels, corrosion allowances shall be applied to both the internal and the jacket side of the shell plate.

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Unless otherwise specified on data sheet, Vessels which are Corrosion Resistant Alloy cladded is applied, no Corrosion allowance to be provided, but shall be provided on vessels coated with a polymeric coating. 5.5

CORROSION RESISTANCE ALLOY CRA CLADDING:

When Corrosion Resistance Alloy (CRA) cladding is specified to protect the base metal from corrosion, the alloy protection may be integral cladding, or weld overlay. Applied liners are not acceptable unless specified by Customer in writing. If stainless steel plate or integral clad plate is used, the Manufacturer shall purchase iron free cladding from the mill as determined by the ferroxyl test described in ASTM A380. Manufacturer shall take the necessary precautions to maintain this condition during fabrication especially from rolls, which could embed rust in stainless steel cladding. If embedded iron contamination is suspected, additional testing is required using the ferroxyl test or copper sulphate test. For Carbon and low alloy steel vessels cladded with Corrosion Resistant Alloys (CRA); manufacturer shall perform cleaning, descaling and passivation (as applicable) for clad surface and other CRA steel attachments in accordance with ASTM A380 after completion of all vessel component welding and prior to heat treatment. Manufacturer shall take all necessary measures to avoid degradation of stainless steels due to heat treatment. Examples of degradation are sigma phase formation and heat tinting. Measures may include control of PWHT holding temperature and exposure time, selection of low-carbon or stabilized grades of stainless steel with supplementary Intergranular Corrosion Test to achieve a No. 1 Finish of SA-480 as indicated in ASME code, Section II. Alloy protection thickness shall not be considered in calculation of pressure thicknesses, even if permitted by design code, it shall be considered only as corrosion allowance. When applied liners are allowed, vent to the outside of the vessel through vent holes tapped for 1/8” NPT. 5.6

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SOUR SERVICE

In petroleum and natural gas service, all vessels and parts used in hydrogen sulphide containing service shall comply with requirements of the NACE Standards MR0175/ ISO 15156. For vessels and parts in refinery service, compliance with requirements of NACE MR0103 shall be made. Unless otherwise specified, for any H2S containing environment, the carbon steel and low alloy steel materials shall be certified as resistant to hydrogen induced cracking (HIC). This is applicable only for the pressure parts manufactured from rolled plates and

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whenever the environment containing H2S.Testing shall be conducted in accordance with NACE TM 0284 and the acceptance criteria shall follow the NACE MR0175/ISO15156. 5.7

SHELL AND HEADS

Unless otherwise specified or requested, plates of different thickness shall be aligned along the internal surface of the vessel. Shell courses shall have only one longitudinal weld, unless otherwise agreed. Minimum shell course height shall be 600 mm, unless otherwise agreed. Whenever possible, heads shall consist of a single piece. However, heads of diameter larger than 2000 mm can be fabricated from the lowest possible number of pieces. Weld seam shall be fully radiographed before forming and again in the knuckle region after forming. 100% surface crack detection shall be made after forming. Weld seam shall intersect or be within a concentric circle of diameter having 0.8 times the head diameter. Elliptical and torispherical heads shall have a straight flange where the minimum length is 0.3 D.th or 50 mm, which is ever greater but not exceeding 100 mm. Where D is the inner diameter of head and th is the minimum head thickness, both in mm. 5.8

NOZZLE CONNECTIONS

All pressure connections shall be flanged unless otherwise stated in equipment data sheet. Minimum nozzle connection is NPS 2 (DN50) with 300lb rating minimum, except for temperature measurement nozzles can be NPS 1.5 (DN40) of the Long Weld Neck type and 300 lb rating minimum. Trim vent and drain connections and manholes shall be flush with the inside of the vessel when specified on the nozzles orientation sketch. Loose nozzle liner are not accepted in case of vacuum service, cyclic temperature service and temperature higher than 345°. Nozzles shall comply with the standard ASME B 36.10M for steel pipes. ) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

Pipe couplings, socket welded, single fillet welded, studded and screwed connections are not permitted. All nozzles less than NPS 20 (DN 500) shall be seamless; while nozzles formed plate necks may be used for NPS 20 (DN 500) and larger. Longitudinal welds in such branches shall be 100% radiographed. Nozzles should normally be of the set-in design, unless it is impracticable to use set-in branches, set-on branches may be used; only after written Customer approval.

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In the case of set-on branches, the edges of the holes in the shell plate shall be examined to prove that the plate local to the connection is not laminated. Magnetic Particle Inspection (MPI) and Ultrasonic Testing (UT) shall be used on ferritic material and Dye Penetrant inspection (DPI) on austenitic material. The examination shall also be conducted after welding to ensure that lamellar defects have not developed during welding. Nozzles shall not pass through weld seams. Compensation pads when permitted should not cover weld seams, unless agreed by Customer. The first flange on the bottom branch of a vertical vessel supported on a skirt should be located outside the skirt. Pipework welded to the vessel nozzles shall be designed to the vessel code. All nozzles inner diameter shall be equal along all the neck length. For carbon steel nozzles, nozzle neck minimum thickness shall be as follows: Nozzle Nominal Diameter

5.9

Nominal Thickness

NPS 3 (DN80) and smaller

SCH 160

From NPS 4 (DN100) up to NPS 12 (DN300)

SCH XS

From NPS 12 (DN300) up to NPS 24 (DN600)

SCH 60

From NPS 24 (DN600) and larger

SCH 40

BUTT-WELD NOZZLE CONNECTIONS

When the vessel data sheet specifies butt-weld connections instead of flanged nozzles, butt-weld ends shall be prepared in accordance with the latest edition of ASME B16.25 with these exceptions: 

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No backing rings are permitted. The inside contours at all butt-weld ends shall be taper-bored at a slope not exceeding 1 to 3 to match the adjoining specified pipe ID.

5.10 OPENINGS REINFORCEMENT

The reinforcement for the nozzle opening shall be integral type, when required by the applicable codes or where any of the following conditions are met: 

Vessel component (plate) thickness is thicker than or equal to 40 mm,



Vessel operating temperature exceeds 300°C,



Where Operating partial pressure of hydrogen exceeds 20 barg or exceeds 5 barg simultaneously with operating temperature exceeds 150°C,

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For ferritic vessels, where operating temperature is below minus 50°C,



For wet sour or hydrofluoric (HF) acid services,



When internal inspection of vessel will not be easy or feasible.



If cyclic load is specified.

Reinforcing pads when permitted shall be provided with one tell-tale hole per sealed section drilled and tapped ¼” NPT to permit an air test of the attachment welds at 1 barg. The holes shall be left open during welding and PWHT, and to be plugged with heavy grease after testing. 5.11 NOZZLE PROJECTION

Final nozzle projections will be given on Customer orientation sketches, dimensioned from the vessel centerline, otherwise specified; projections are established from the inner diameter of the shell as follows.

NOZZLES PROJECTION (mm) Size

300 lb and less

600 lb and larger

NPS 3 (DN80) and smaller

200

250

NPS 4 (DN100) through NPS 12 (DN300)

250

350

NPS 14 (DN350) and larger

300

500

5.12 INSPECTION OPENINGS

Manhole or Inspection Openings shall be in accordance to code requirements unless otherwise specified. Additional manholes over and above the minimum requirements of the design codes shall be provided in vessels as required for inspection, installation, and removal of vessel internals. Minimum two manholes are required for vessels having tan to tan length higher than 9 m. ) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

Manhole shall not be less than 460 mm inside diameter. Where a vessel has large removable internals, the preferred size of manhole is 610 mm inside diameter. Wherever practicable, multiple manholes on one vessel should be located vertically in line. A manhole should be provided in any large compartment to permit access to all parts of the interior of the vessel. Manhole covers should be equipped with swing arm davit. Grab Rungs for Manholes shall be as per Standard Detail 4. Vertical distance between manhole centerline and adjacent platform floor should be 1100 mm. Where manholes are in positions where access is limited (e.g. high up on tall

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vessels), consideration shall also be given to the size of the platform in the event that emergency treatment of personnel is required. Where a manhole is not feasible due to small vessel diameter, the vessel head may be flanged to access to internals. All internal edges on manhole and inspection openings shall be rounded to at least 3 mm. 5.13 FLANGES

Flanges shall be of welding neck type and shall comply with the following standards: 

Up to NPS 24: ASME B 16.5



Over NPS 24: ASME B 16.47 Series “A” only.

Covers for flanges over NPS 24 (DN600) size shall satisfy ASME Code requirements. Manholes and hand holes shall be circular and provided with bolted covers, gaskets, bolts and nuts. Flange bolt holes shall straddle the vertical or east-west, north-south horizontal centerlines unless otherwise noted. On flanges that are not vertical or horizontal, the bolt holes shall straddle the radial centerline unless otherwise noted, see Standard Detail 1. Flange facing shall be raised face with smooth surface finish 3.2 to 6.35 μm (Ra) maximum for all flanges of rating up to and including 600 lb, while facing shall be ring type joint for flange rating 900 lb and above, unless otherwise specified in data sheet. All flanges shall be either Weld Neck, Long Weld Neck or Self Reinforced Flanges. Lap joint, socket welding or slip on flanges shall not be used without written acceptance from Customer. Flange hub thickness shall be equal to thickness welded to it. Flange ratings shall not limit the maximum allowable working pressure. 5.14 GASKETS

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The type of gasket to be utilized will be specified in the vessel data sheet. The Manufacturer shall furnish gaskets for all cover plates, manholes, blind flanges and bolted attachments supplied with the vessel. Gaskets shall be new, asbestos free and in accordance with ASME B16.20 and ASME B16.21. For rating up to and including 600 lb. rating, spiral wound gasket shall be used. Spiral wound gasket material for application temperature less than minus 29° C shall be with PTFE filler, whilst temperature greater than minus 29° C, filler material shall be graphite. For nozzle flanges of rating greater than 600 lb, ring joint gaskets shall be used; Gasket material shall be soft iron Zinc plated or equivalent.

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5.15 PRESSURE BOLTING

Stud bolts, which have an unthreaded area with a diameter greater than the root diameter, shall not be used. The strength of bolts is based on the cross section at the smallest diameter. Integral headed bolts are not permitted. Bolts shall be extended not more than 6 mm beyond the nuts. On bolts 1½" and larger, hardened washers under nuts shall be furnished. Coat all studs with a suitable thread lubricant before assembly. Use solid dry film lubricant on all studs with design temperature of 426 oC or above, and all studs 1½” and larger. Hydraulic bolt tensioners shall be used for all joints with nominal bolt diameter 2” and over; or when nominal bolt diameter is 1½” and over and the flanges are either on hydrogen service or are 600 lb or over. Bolts for bolt tensioning shall be extended by the length of one nut and suitably protected by a cap during service. Customer should issue details of the hydraulic bolt tensioning equipment on site for the Manufacturer to ensure that the flange design is suitable. 5.16 QUICK OPENING CLOSURE

End closure door shall conform to ASME section VIII, Division 1, UG-35.2 (Quick Actuating Closures). Design of quick opening closure shall be according to ASME Section VIII, Division 1, Appendix 24. Quick opening closure shall be of the jaw type or other type approved by Customer and shall have safety system (safety bleeder lock) allowing the opening only when there is no pressure in the equipment. The safety system shall be designed such that there is no risk of blockage within the safety bleeder mechanism. ) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

Quick opening closure shall be hand operated by one man, to permit door opening and closing within an acceptably short period of time without the use of additional tools, the maximum force applied for the closure shall not exceed 20 kg and an adequate stress reducer shall be used to make it fall within the allowable value. The system of operation for the end closure door shall ensure that, in the event of failure of any part of the door opening mechanism, the door shall remain shut in a safe condition. End closure shall incorporate a permanently attached warning plate in both English and Arabic languages that gives the Manufacturer's instructions for safe operation of the closure.

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5.17 INTERNAL STRUCTURES

Continuous weld shall be used on both sides of internal shell or head attachments, such as baffles, tray support rings, vortex breakers…etc. Covering shell weld seams should be avoided. Details of some special internal features are shown in the following figures: 

Standard Detail 2 Vortex Breakers.



Standard Detail 3 Demister Pad Assembly and Details.

The vessel Manufacturer shall furnish and install all internal support rings and other internals where specified by Customer. The design of trays, tray supports or other internals welded to the vessel shall take into account the effect of differential strains which may arise due to transient temperature/pressure conditions in service as specified, during PWHT or hydraulic test. The design of internals shall permit all reasonable internal inspection. The design of internal fittings shall ensure that they are proof against loosening by vibration. Coils and other internals shall, where necessary, be supported by temporary stiffeners to prevent damage during transportation and erection. These temporary supports shall not be welded to the vessel. Single-sided fillet welds or intermittent welds may be used to prevent damage for the attachment of internals to the shell. Internal supports in clad vessels shall be welded to base metal, unless otherwise specified by Customer. Removable internals shall be installed after any PWHT has been carried out. Removable internals and piping shall be constructed in properly sized and flanged sections to pass through adjacent manhole. First internal flanges shall be located as close to the shell as possible leaving room for bolts removal and wrench clearance. ) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

For the general requirements of trays and components, refer to tower internals specification.

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5.18 SUPPORTS FOR VERTICAL VESSELS

Vertical vessels shall be supported on skirts, unless legs or lugs are specified. Typical vertical vessel support details are shown in the following figures: Standard Detail 5

Skirt Opening Details

Standard Detail 7

Vertical Vessel Base Ring Details

Standard Detail 8

Vertical Vessel Angle Legs

The supports shall be designed for wind and seismic loads. The requirements of Appendix G of the ASME Section VIII, are mandatory. The skirt and its attachment welding shall be located to leave the bottom girth seam exposed. Design stresses higher than allowed by the code shall not be used. In order that foundation design and construction can proceed before the Manufacturer completes the final vessel design, Manufacturer shall furnish the number, size, and bolt circle of the foundation at early stages of design. Minimum spacing between foundation bolts shall be 400 mm. The maximum allowable stress used in calculation for base rings shall not exceed 100 N/mm 2, The skirt shall be attached so that its mean diameter coincides approximately with the vessel mean diameter. Attachment welds shall be continuous and shall not cover a shell to head weld. When the skirt is welded to a head of thickness exceeding 100 mm or for equipment in cyclic operation or high temperature service (design temperature greater than 345 oC), this weld shall be full penetration butt weld, to be carried out by an external projection on the vessel made by either forging or weld build-up with 100% Ultrasonic Examination according to ASME section VIII, Division 2, Fig. 4.2.4, detail (e). 5.19 SUPPORTS FOR HORIZONTAL VESSELS

Only two supports for horizontal vessels shall be used; unless otherwise specified. Standard Detail 6, Horizontal Vessel Feet, shows the type of support required. Alternative designs with the same fixation bolts locations and support base dimensions may be used if accepted by Customer. ) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

The Manufacturer shall determine the web and flange plates thicknesses, attachment weld sizes, and the need for reinforcing plates on the shell. Manufacturer shall also determine the induced stresses in shell due to the location of saddle supports in accordance with ASME code, Section VIII, Division 2, in no way should the support to head tangent distance exceed 0.2 tangent to tangent length. Fixation bolts and support plates thickness shall be designed against overturning and uplift due to the greater of wind and seismic loads. Stresses due to expansion load during operation shall be verified as well as the stresses due to load required to extract any internals during erection or maintenance.

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Saddle wear plates shall be provided with one ventilation hole drilled and tapped ¼” NPT at its lowest point. The holes shall be left open during welding and PWHT. For stacked vessels, the design for superimposed loads shall be proven by calculation and Manufacturer shall provide levelling shims in accordance with Standard Detail 14. 5.20 FIXATION BOLTS

The fixation bolts number, diameter and spacing shall be shown on Manufacturer drawings. Corrosion allowance of 3.2 mm shall be provided on the bolt diameter. The maximum allowable stress used in calculation for fixation bolts shall not exceed 100 N/mm2, while the foundation concrete bearing stress shall be considered equal 4.5 N/mm2. For vertical vessels, fixations bolts shall be supplied in multiples of four and with minimum number as shown below: B.C.D. (mm)

Min. No. of Bolts

BCD ≤ 1200

4

1200 < BCD ≤ 3000

8

3000 < BCD ≤ 5000

12

5000 < BCD ≤ 7000

16

BCD > 7000

20

Circumferential bolts spacing shall not be less than 400 mm, unless otherwise agreed. 5.21 LIFTING LUGS

Manufacturer shall provide lifting lugs or trunnions for all vertical vessels and as specified in equipment data sheet considering a design load factor of 1.5 unless otherwise agreed. For some small size equipment or special equipment, lifting from a suitably designed nozzle may be proposed in order to avoid large permanent attachments. ) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

Lifting lugs and trunnions attachment welds to the shell shall be full penetration welds. Orientation of lifting lugs to be approved by Customer. Tailing lug shall be provided for vertical vessel with tan to tan length higher than 5 m.

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5.22 EXTERNAL ATTACHMENTS

Permanent welded attachments to pressure parts shall be of the same material type and meet the same requirements as the pressure part. All attachments shall be welded to the vessel before painting and shipment. Any exceptions must be noted on Manufacturer's drawings and accepted by Customer. Interference between shell seams, manholes, nozzles or other attachments shall be avoided. When it is necessary for external attachments to cross-vessel seams, the attachment weld at the seams shall be omitted. Carbon steel reinforcing pads, vessel supports, and external attachments shall not be welded to other than carbon steel shells and heads. For vessels with a design temperature of below minus 29 oC, load-bearing attachments shall be made from a material with impact properties equal to or better than those of the vessel. This applies from the point of attachment to the vessel to a point where the metal temperature is minus 29 oC or above. The effects of external attachments loading to shells and heads shall be checked using the WRC bulletin No 107/537 - "Local Stress in Spherical and Cylindrical Shells due to External Loading ". This shall include lifting loads at lifting attachment. Where WRC is not applicable, FEA shall be performed. Doubling plates shall be provided at any external attachments where unacceptable stresses would otherwise occur. Corners of doubling plates shall be rounded to a radius not less than 50 mm. Each pad shall contain one ventilation hole tapped ¼” NPT each sealed compartment. The holes shall be left open during welding and PWHT. Insulation supports, stiffening rings and external attachments shall be designed and constructed to prevent the holding of rainwater, which can cause under- lagging corrosion. For the low temperature service , If vessels external attachments` guides / supports are required by material requisition, the special type shall be supplied as per piping standard drawings in order that Any contact between the welded attachment and load bearing members (i.e. Pipe guides, pipe supports & platform support clips.. Etc) shall be special type for low temperature service complete with polyurethane or wooden blocks. ) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

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5.23 STIFFENING RINGS

Stiffening rings are acceptable to overcome problems encountered in design. Typical uses are reinforcing the shell for external pressure, reinforcing the cone to cylindrical shell junctions for internal pressure or stiffening shell at saddles for large diameters and thin wall horizontal vessels. Stiffening rings required to satisfy an external pressure design condition shall have the following minimum spacing: Vessel inner Diameter, D

Min. Distance Between Rings or Lines of Support

D≤

3600 mm

1800 mm

3600 mm < D ≤

6000 mm

D/2

6000 mm < D ≤

7300 mm

3000 mm

D>

7300 mm

3600 mm

Stiffeners shall be positioned at least 100 mm clear of circumferential seam welds, branches and other permanent attachments. 5.24 NAMEPLATE

An austenitic stainless steel Customer nameplate shall be provided as per Standard Detail11, 2 mm minimum thickness, permanently attached to a bracket welded to the vessel body, not on supports. In addition, the nameplate required by design code shall show the item number, service and other data required by the applicable design Code. In case of vertical vessels with skirt support, an additional Customer nameplate shall be added on vessel skirt to facilitate access to nameplate from ground. Where a vessel comprises separate compartments, a name plate shall be provided for each compartment. ) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

Nameplates shall be of stainless steel with the required data stamped, or preferably, engraved. Lettering shall be of 4 mm high, unless otherwise shown. When cold temperature insulation is specified for the vessel, an additional nameplate mounted on a wooden block that is bolted to vessel attachment is required. Nameplate support shall be of C shape and of the same material as part attached to it and of minimum thickness of 4 mm. It shall extend at least 50 mm beyond the outer surface of vessel or insulation, if any.

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5.25 INSULATION

Insulation for thermal conservation shall be provided when required in datasheet. Insulation for personnel protection shall be applied for operating temperature equal to or o higher than 60 C, while Cold insulation is required when operating temperature is equal to or below 0oC. Insulation supports/clips details shall be as per Standard Detail 9 and its material of construction shall be of the same grade of the part welded to it. 5.26 GROUNDING LUGS

Two austenitic stainless steel grounding lugs shall be provided on each vessel, and shall be in accordance with Standard Detail 13.

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

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6.0 6.1


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FABRICATION GENERAL

Fabrication Procedure shall be submitted by manufacturer showing step by step the fabrication processes including material receiving, marking, Cutting, drilling, fitting, welding operations, cladding application and cleaning before heat treatment showing the grinding tools and rolling machines suitable for vessel material of construction. 6.2

WELDING

An arc welding process shall be used. In order to simplify, clarify and expedite the required purchases approval of weld procedures, Manufacturer shall submit his weld map. The weld map shall provide space for a simple single line sketch of an item. All pressure containing welds and dissimilar-metal welds shall be indicated and a separate letter or number shall identify each different welding procedure. Each different procedure shall be described separately. All welding shall be performed and qualified according to approved manufacturer Welding Procedure Specification (WPS), Procedure Qualification Records (PQR) and Welders Performance Qualification Records (WPQR’s); complying with the recommended ASME Section IX Forms QW 482, QW 483 and QW 484A or B. All main seam welds shall be full penetration butt-welds and, where possible, double sided conforming to type no. (1) of ASME section VIII Div.1 table UW-12. All nozzle to shell or head welds shall be full penetration. Permanent weld backing bars are unacceptable unless specifically approved by Customer in writing. Temporary back-up bars must match the chemical composition of the base metal being welded. Welding filler metal shall be similar, with respect to chemistry, corrosion resistance, and mechanical and physical properties, of the base metal being welded.

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

Cladding shall be stripped back on clad plate to a minimum of 5 mm from the plate edges before welding of the backing plate. Backing plate shall be welded with matching electrodes so that the weld on the clad side is flush with the backing plate surface. Deposited ferritic weld metal must not contact the austenitic or high chromium steel cladding. When CRA overlayering protection is specified, minimum depth of the required undiluted composition of overlay from the finished deposit surface shall be 3 mm. For welded seams in clad plate and clad restoration weld overlay, chemical composition of the cladding weld shall be checked using a proven quantitative analytical technique . The major alloying elements shall be analysed, including carbon to establish that the overlay meets the specified composition

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The chemical analysis must meet the minimum requirements of the SFA specification for the welding electrode being used, to the depth of the cladding thickness from the finished deposit surface. One analysis of each procedure and one analysis of each shell course shall be made. If any welds are deficient, all overlay welds shall be checked. Weld overlays, both automatic and manually welded, must be liquid penetrant examined in accordance with ASME Section VIII and V. This includes the overlay on shell courses and the overlay required to cover welds between courses and around nozzles. Where a weld seam and an attachment weld unavoidably intersect or lie within 40 mm of each other, an examination of the seam weld shall be carried out prior to making the attachment weld and after prior written Customer approval. The examination shall be for a distance of 100 mm or three times the shell thickness, whichever is greater, from the point where the welds lie closest. Main weld shall be ground and flush, surface flaw shall be detected then examined with Ultrasonic and X-ray. On completion, surface flaw shall be detected at both main seam and component weld. The minimum leg length of internal fillet welds shall be 5 mm plus the corrosion allowance. In general, a weld subject to forming shall have full radiographic or ultrasonic examination before forming and surface flaw detection after. The position the elevation of longitudinal and circumferential welds of the shell shall be shown and specified. Wherever possible, these welds shall not interfere with nozzle welds or anything else welded to the vessel. Welds shall not overlap. 6.3

WELDED JOINTS LAYOUT:

Welded joints shall be arranged so that: 





) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1





Visual inspection can be made with all internals in place No openings intersect with a longitudinal or girth joints No saddle bearing plates, nozzle-reinforcing pads, or wear plates cover longitudinal or girth joints No nozzle or other attachment weld edge shall be closer to the nearest longitudinal or girth joint weld edge than 1.5 times the related shell or head wall thickness, with a minimum distance of 40 mm Centres of the longitudinal joints of two adjacent courses shall be staggered 30° minimum apart.For horizontal vessels, longitudinal weld seams shall be located above the horizontal plane through the centreline of the vessel and oriented at 30° minimum above the horizontal plane for shell courses containing saddle support.

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Welds inaccessible for double-sided welding (e.g. circumferential closing joint of small diameter vessels, piping and fitting butt welds) shall be single butt welds equivalent to a double butt-welded type no. (1) of the Code table UW-12 (which means in particular full access for visual inspection at the back side of the weld). Attachment of intermediate heads shall be as shown in the Code Fig UW-13.1 sketch (e). 6.4

NOZZLES WELDING

Full penetration welds shall be used for all nozzle and manhole attachments. Details for 1, 2, 3, and 4 of figure UW-16.1 of the ASME Section VIII Division 1, are the preferred welding attachment details. Details (c), (d) and (e) of that figure are acceptable. Other attachment weld details are not acceptable without specific written approval of Customer. 6.5

HOT FORMING

Hot forming describes operations carried out above the normal stress relieving temperature and above the lower critical temperature of carbon and low alloy steels. When hot forming operation is carried out the Manufacturer shall ensure, through mechanical testing, that the hot formed material meets the requirements of the original material specification. 6.6

WELD HARDNESS

Hardness tests shall be on P-1 material. The maximum Brinell hardness is 200. Hardness test shall be made at or near the centre of the weld or surface to be tested on the side exposed to the process environment. Where not practical, the test may be made on the opposite side. The surface shall be prepared in accordance with ASTM E-10. Telebrineller portable tester shall be used or other device of comparable accuracy that can be verified by calibration. The tests shall be performed after final Post Weld Heat Treatment. Manufacturer shall make one hardness test for each 3 meters, or fraction thereof, for each longitudinal and circumferential seam of each course. One hardness test shall be made for each nozzle to shell weld. One test shall be made on each surface cut with oxy-fuel or Arc-Air, which is left un-welded on the finished part. One test shall be made on each area where a temporary weld was made and removed. All hardness readings in excess of 200 BHN shall be reported to Customer. Any corrective action shall be reviewed with Customer before proceeding.

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

For material other than P-1, the maximum hardness and test locations will be given in the requisition. 6.7

TOLERANCES

In addition to the fabrication tolerances specified in ASME Section VIII, tolerances given in Standard Detail 10 shall be applied.

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6.8


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DIE STAMPING

Where die stamping is permitted, rounded or blunt dies shall be used 6.9

SPECIAL PRESSURE TESTS

Manufacturer shall apply an air test of at least 1 barg to each external nozzle reinforcing pad, saddle wear plate or similar attachment. Before Post Weld Heat Treatment and after hydrostatic test, pressure all alloy liners with 1 barg air and apply a leak-detecting solution to the liner welds. Any leaks shall be repaired and retested. Vent holes through the backing plate shall be left open during the hydrostatic test. 6.10 MARKING

Marking materials may result in harmful contamination of surfaces. Marking ink or paint for use on austenitic stainless steel, nickel alloys, and other alloys shall not contain harmful metal or metal salts such as zinc, sulfur, lead, copper or hydrogen; which cause corrosive attack on heating. 6.11 POST WELD HEAT TREATMENT (PWHT)

Annealed chrome-moly P-4 and P-5 materials shall be Post Weld Heat Treated at a minimum temperature of 704 oC. Quenched and tempered P-4 and P-5 materials shall be Post Weld Heat Treated in accordance with the code. Where local Post Weld Heat Treatment is employed, thermocouples shall be placed inside and outside at both top and bottom. PWHT procedures shall be submitted for review whenever PWHT is required. When PWHT is required, base material shall be ordered with at least 2 additional PWHT cycles other than required for production. Certificates shall include all required test at both conditions, min and max PWHT cycles. On all vessels subject to heat treatment due to service, Manufacturer shall paint on two sides of the shell in letters two inches high, POST WELD HEAT TREATED FOR SERVICE DO NOT WELD, HAMMER, OR DEFORM . The paint used must be compatible with both the primer and the finish paint. ) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

6.12 STRESS CRACKING

When vessel data sheet specifies PWHT for service conditions, welding, hammering, or deformation are not permitted after PWHT. All internal and external attachments, clips, insulation studs, nameplate bracket, and the like shall be welded to the unit before post weld heat treatment.

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6.13 PREVENTION OF STRESS CRACKING OF STAINLESS STEELS

Special precautions shall be taken with vessels fabricated of austenitic stainless steels to prevent stress-cracking resulting from contact with chlorides. Water as specified in Paragraph 6.16 shall be used for hydrostatic testing or washing. Vessel shall be drained and mopped immediately following testing and washing. Any puddles or pockets of water shall be dried. Also contact with the ground shall be avoided. 6.14 INSPECTION

Vessels shall be inspected to the requirements of the code by Inspection Authority or any other specified authority. The NDE schedule and all NDE procedures shall be subject to approval by Customer. All personnel concerned with inspection, interpretation and NDE shall be qualified to at least ASNT Level II. Evidence of the qualification shall be available to Customer for verification. Customer reserves the right to test and monitor the performance of any NDE operator employed by the Manufacturer, or his sub-Manufacturer, and to exclude any that are deemed unsatisfactory. Valid calibration certificates for NDE equipment shall be available for inspection at all times. The complete length of all welds on lifting and tailing attachments (e.g. attachment of lug to pad, pad to vessel, etc.) shall be examined by NDE for surface flaws. For carbon and low alloy steel material where the plate thickness exceeds 50 mm, ultrasonic examination of all longitudinal and circumferential seam welds shall be made in addition to radiography. Vessels requiring radiography, ultrasonic and PWHT shall be subject to radiography and ultrasonic before PWHT, and ultrasonic after; provided that ultrasonic test has permanent record and after Customer written approval.

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

Radiographic examination during fabrication shall be carried out with X-ray equipment unless the use of isotopes is specifically approved by Customer. On carbon and low alloy steel vessels subject to PWHT, the shell to nozzle welds on nozzles of 220 mm outer diameter and over shall be subject to MPI after PWHT. In addition to the ASME Code Section VIII requirements, welds joining nozzles of 170 mm outer diameter and over to carbon and low alloy steel vessel walls of 50 mm thickness and over shall be magnetic particle examined. The examination and acceptance criteria is to be made in accordance with the applicable relevant paragraph of ASME Code Section VIII.

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Examination shall include the root pass, the back gauged area and the weld cover passes. All saddle-on type nozzles with nozzle thickness over 50 mm, which have full penetration welds, require a magnetic particle examination of the surface of the shell opening. This examination is to be made in accordance with applicable relevant paragraph of ASME Section VIII after all welding and heat treatment is completed. Final NDT shall be undertaken after PWHT. 6.15 SOUR SERVICE

Vessels in wet sour service shall be subject to: 

100 % radiography;



100 % wet fluorescent MPI on internal welds;



100 % MPI on external welds.





The location of any temporary construction welds shall also be subject to MPI as above. Final NDE shall be carried out after PWHT.

6.16 HYDROSTATIC TEST

Each vessel shall be Hydrostatically shop tested in accordance with ASME Code, Paragraph UG-99 (C) for Section VIII Division 1 vessels and Part 8 for Section VIII Division 2 vessels. Connections with sight glasses, where the Manufacturer furnishes the glass, shall have the sight glass in place during hydrostatic test. Hydrostatic test shall be for one hour minimum. Vertical vessels may be pressure tested in the horizontal position with suitable support. The design of vertical vessels shall enable them to be tested in the vertical erected position. The value of field hydrostatic test pressure shall be indicated on the name plate.

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

The gaskets, joint rings and bolting, used on all flanged connections during pressure testing shall be identical to those for operation. Operating / Service gaskets shall not be installed for shipment of vessel or hydrotest. They shall be shipped separately with spare gaskets and bolting for site installation. No repairs shall be carried out after hydraulic testing without the approval of Customer. As soon as possible after completion of the hydraulic test, all vessels shall be drained and dried throughout.

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6.17 TEST MEDIUM

The hydraulic test fluid shall be fresh water unless prior approval has otherwise been given by Customer. For carbon and low alloy steel vessels, the minimum temperature shall not be less than 7 °C. For hydrostatic testing of the carbon and low alloy steel vessels, use fresh water with less than 3000 ppm chloride content after injecting 100 ppm biocide inhibitor. For austenitic stainless steel vessels or austenitic clad, where complete draining is possible or where trapped water pockets can be mopped, use potable water with less than 25-PPM chlorides and mop dry all water pockets. If the vessel cannot be mopped dry and pockets are unavoidable use demineralized water with less than 10 PPM chlorides. 6.18 PREPARATION FOR SHIPPING

The vessel shall be thoroughly drained and cleaned before shipping. Weld slag, loose scale, oil, dirt and rubbish shall be removed. All machined surfaces shall be covered with an easy removable rust preventative. After testing, vent holes shall be filled with stiff grease or other material that is not capable of sustaining pressure. Openings shall be closed with protective covers of metal, gaskets and four or more bolts. Permanent blind flanges or covers included in the Manufacturer’s supply shall be bolted with hydrostatic test gaskets, stud bolts and nuts in place. Weld end opening must be closed with plastic and heavy tape. Prior acceptance by Customer is necessary before using temporary bracing to hold internals in place during shipment. All parts and accessories being shipped shall be tagged and boxed separately. Customer item number and purchase order number shall be shown on the identification marking.

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

Stainless steel or CRA cladded vessels and vessels having internal stainless steel parts, shall be protected during transportation by internal nitrogen blanketing with manometer for pressure checking and nitrogen bottles to maintain the nitrogen pressure during shipment. All other items shall be protected by no toxic corrosion inhibitor such as desiccants or vapors corrosion inhibitors (VCI).

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APPENDIX 1.0:

STANDARD DETAILS

STANDARD DETAIL 1, BOLT HOLE PLACMENT

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

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STANDARD DETAIL 2, VORTEX BREAKERS (1/2)

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STANDARD DETAIL 2, VORTEX BREAKERS (2/2)

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STANDARD DETAIL 3, DEMISTER PAD ASSEMBLY AND DETAILS

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

REV. 0

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STANDARD DETAIL 4, GRAB RUNGS FOR MANHOLES

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

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STANDARD DETAIL 5, SKIRT OPENING DETAILS

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

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STANDARD DETAIL 6, HORIZONTAL VESSEL FEET

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

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STANDARD DETAIL 7, VERTICAL VESSEL BASE RING DETAILS

BOLT DIA

T1

T2

T3

¾”

-

20

-

7/8”

-

20

1”

20

1/8”

H

12mm THK. WASHER

MIN. GAGES (3)

S

WELD

SIZE

HOLE

A

B

C

30

57 x 57

22

-

40

40

-

-

-

35

57 x 57

25

-

45

40

-

-

20

12

38

65 x 65

29

45

50

40

135

6

20

20

12

42

70 x 70

32

50

50

40

135

6

1 ¼”

20

20

16

45

75 x 75

35

50

60

40

140

6

1

3/8”

20

20

16

48

75 x 75

38

50

60

45

140

6

1 ½”

22

20

16

52

82 x 82

42

55

60

45

140

8

1 ¾”

22

25

20

57

90 x 90

48

60

68

50

145

8

2”

25

25

20

64

100 x 100

54

65

75

50

145

8

2 ¼”

25

25

22

70

100 x 100

60

70

80

54

150

8

2 ½”

25

25

22

75

115 x 115

67

75

82

60

160

10

2 ¾”

30

32

22

82

120 x 120

73

82

90

68

165

10

3”

30

32

22

90

130 x 130

80

90

100

75

170

12

1

) 3 1 / 1 1 (

MINIMUM

8 NOTES: 0 0 0 1. M 2. R F 1 E G 3. 0 4. 0 0 5. Z 0 0 0 0 1

W

ALL DIMENSIONS ARE IN mm, EXCEPT OTHERWISE NOTED. BOLT HOLES STRADDLE VESSEL CENTERLINES AND ARE EQUALLY SPACED, WHERE TWO CONCENTRIC ROWS OF ANCHOR BOLTS ARE REQUIRED THEIR SIZE, LOCATION, ORIENTATION AND THE BASE RING DETAILS MUST BE AS STANDARD DETAIL 8, VERTICAL VESSEL ANGLE LEGS SHOWN IN THE VESSEL SPECIFICATION. FOR ¾” & 7/8” ANCHOR BOLTS, OMIT CHAIRS OR DOUBLE RING AND USE “H” DIAMETER HOLES IN BASE RING. GAGES A, B & C ARE MINIMUMS. GAGES A & C MAXIMUMS ARE TABLE VALUES PLUS 12mm IF MANUFACTURER IS UNABLE TO HOLD GAGES WITHIN THESE LIMITS, NOTIFY ENPPI.

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STANDARD DETAIL 8, VERTICAL VESSEL ANGLE LEGS

VESSEL OD

38 mm MIN.

13 mm TYP.

BOLT CIRCLE DIAMETER

m m 6

HEADSEAM

.

TANGENT LINE

. n i m m m 0 5 1

6 mm PLATE COVER

45

m m 6MIN. EACH LEG

NOTCH LEGS TO CLEAR HEAD

m m 6

E T A L P m . m N 2 I 1 M

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

    

USE FOUR LEGS UNLESS INDICATED OTHERWISE ON VESSEL SKETCH. MIN. ANGLE SIZE IS 64 X 64 X 6 MM. BOLT CIRCLE DIAMETER EQUALS VESSEL INNER DIAMETER LESS 38 MM. NOTIFY ENPPI OF ANY DEVIATIONS. PROVIDE FIRE PROOFING SUPPORTING STUDS, WHERE FIREPROOFING IS REQUESTED IN THE VESSEL DATA SHEETS, FOR GINITE MATERIAL 50 MM THICKNESS.

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STANDARD DETAIL 9, VESSEL INSULATION SUPPORTS (1/2)

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

REV. 0

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STANDARD DETAIL 9, VESSEL INSULATION SUPPORTS (2/2)

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

REV. 0

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STANDARD DETAIL 10, VESSEL TOLERANCES (1/3) C

B

A I

T

D B

F

C E

R

F E

J Reference plane

N

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

O

P

Q

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STANDARD DETAIL 10, VESSEL TOLERANCES (2/3) E

N B

C

F J L

K

F R

E

T K

Reference lane

M

I ) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

L

X K D

G

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STANDARD DETAIL 10, VESSEL TOLERANCES (3/3)

SHELL R

Difference between the maximum and minimum inside diameters at any cross section 1% 0.5%

T 12 mm 10 mm/m

For all vessels. For vessels fitted with cartridge trays/internals Deviation from verticality for vertical vessels and curvature for horizontal vessels up to 9 m vertical vessel overall length For vertical vessels of overall length greater than 9 m and horizontal vessels, max. 40 mm

NOZZLES A

2o

B 1.6 mm 2.8 mm 4.8 mm 6.4 mm C

D

6.4 mm 12.7 mm 3.2 mm 1o

E

Deviation circumferentially measured on the outer surface of vessel from reference line, max. 6 mm Max. Tilt across gasket face For nozzles less than 6" For nozzles 6" till 14" For nozzles greater than 14" For access openings only Deviation from horizontal, vertical or the intended position in any direction. For all nozzles, except access opening For access opening only Deviation of bolt holes in any direction Centreline rotation, Max. 5 mm Distance between centrelines and/or faces of any couple of nozzles.

F

6.4 mm 3.2 mm 12.7 mm

For reboiler nozzles or other. For an instrument nozzles Nozzle elevation from reference plane

I

3 mm

Deviation of bolt holes in any direction

J

Nozzles projection. 4.8 mm

for all nozzle

12.7 mm

For access openings only.

SADDLES

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

G

6 mm

Distance from bottom of base plate to reference line.

K

3 mm

Distance centreline of boltholes/support to reference line/shell centreline

L

3 mm

Distance between boltholes in base plate or between boltholes or slots of two saddles

M

2.5 mm/m

Transverse tilt of base plate

N

3 mm

Longitudinal tilt of base plate

BASE RING O P Q S

1.5 mm 3 mm 4.5 mm 6 mm

Flatness Out of level Anchor bolt holes circle diameter and distance between successive holes Distance from bottom of base ring to reference line.

REV. 0

PAGE 44 OF 47

SPECIFICATION SUMED

AIN SUKHNA-EGYPT


STANDARD DETAIL 11, NAMEPLATE

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

NOTES: 1. All dimensions are in mm, unless otherwise noted.

3656-200-100-007

REV. 0

PAGE 45 OF 47

SPECIFICATION SUMED

3656-200-100-007


AIN SUKHNA-EGYPT


REV. 0

STANDARD DETAIL 12, ALLOWABLE NOZZLE LOADS

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

NPS

FR (KN)

MT (KN.m)

NPS

FR (KN)

MT (KN.m)

1.5

1.96

0.41

30

30.74

98.96

2

2.40

0.63

32

32.79

112.59

3

3.55

1.35

34

34.84

127.11

4

4.60

2.24

36

36.89

142.50

6

6.67

4.86

38

38.94

158.78

8

8.76

8.21

40

40.99

175.93

10

11.03

12.76

42

43.04

193.96

12

13.08

17.87

44

45.09

212.87

14

14.23

21.56

46

47.14

232.67

16

16.30

28.15

48

49.19

253.34

18

18.43

35.62

50

51.24

274.89

20

20.29

43.96

52

53.29

297.32

22

22.30

53.21

54

55.34

320.63

24

24.38

63.32

56

57.39

344.82

26

26.64

74.33

58

59.44

369.89

28

28.69

86.21

60

61.49

395.84

FR

AXIAL FORCE

FC = 1.5 FR

CIRCUMFERENTIAL SHEAR FORCE

FL = 1.5 FR

LONGITUDINAL SHEAR FORCE

MT

TORSIONAL MOMENT

MC = 0.6 MT

CIRCUMFERENTIAL MOMENT

ML = 0.8 MT

LONGITUDINAL MOMENT

NOTES: 1. 2. 3. 4.

FR MT MC

ML

FC FL

THIS TABLE IS APPLICABLE FOR RATING 150 LB AND 300 LB. FOR RATING 600 LB AND 900 LB, THE VALUES IN TABLE SHALL BE MULTIPLIED BY 1.25. IN CASE THAT EXCESSIVE REINFORCEMENT IS REQUIRED TO WITHSTAND THESE VALUES, MANUFACTURER MAY ASK FOR CUSTOMER ADVICE. NOZZLE LOAD APPLICATION POINT IS AT NOZZLE TO SHELL INTERSECTION.

PAGE 46 OF 47

SPECIFICATION SUMED

AIN SUKHNA-EGYPT


STANDARD DETAIL 13, GROUNDING LUG DETAIL

) 3 1 / 1 1 ( 8 0 0 0 M R F 1 E G 0 0 0 Z 0 0 0 0 1

NOTES: 1. All dimensions are in mm, unless otherwise noted.

3656-200-100-007

REV. 0

ENPPI Pressure Vessels

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