Design Calculation Offshore Basket

DESIGN APPROVAL OFFSHORE BASKET

(14300 MM L x 1200 MM W x 1400 MM H)

MODEL: BTS-OB-05 REVISION: 0

PT. BESMINDOTAMA SEMESTA Jl. POJ KALIMALANG DS. CIBUNTU, CIBITUNG BEKASI – JAWA BARAT 17520 INDONESIA i ©M.I.Z 2014, PT Besmindotama Semesta

BTS‐OB‐05

CONTENTS

TITLE …………………………………………………………………………....

i

1. CONTENTS …………………………………………………………………….

ii

2. GENERAL ………………………………………………………………………

1

3. DIMENSION AND RATING …………………………………………………..

2

4. MATERIAL AND CONSTRUCTION ………………………………………....

3

5. PRESERVATION ……………………………………………………………….

4

6. MARKING ……………………………………………………………………..

7

7. TESTING AND INSPECTION ………………………………………………....

8

8. DESIGN CALCULATION FOR LIFTING SETS AND PADEYES …...............

10

OFFSHORE BASKET REFERENCE DRAWING:

Drawing Title: OFFSHORE BASKET (Dim. 14300 MM L x 1200 MM W x 1400 MM H) Drawing Number: BTS-119-WI-140530-01

ii ©M.I.Z 2014, PT Besmindotama Semesta

BTS‐OB‐05

1. GENERAL 1.1. Operational Environment The offshore basket is designed and manufactured for repeated use in transport of goods or equipment, handled in open seas, to, from or between fixed and floating installations and ships. It is able to withstand extremes of temperature range -20oC thru 80oC without effect on the offshore basket strength or weather proofness. 1.2. Standard and Regulation The offshore basket is built in accordance with technical requirements of the EN 12079 Part 1 & 2:2006 and DNV 2.7-1:2013 1.3. Design approval of the offshore basket by Bureau Veritas system will be applied.

1 ©M.I.Z 2014, PT Besmindotama Semesta

BTS‐OB‐05

2. DIMENSIONS AND RATINGS 2.1. External Dimensions Length

:

14,300 (± 5) mm

Width

:

1,200 (± 5) mm

Height

:

1,530 (± 5) mm

Length

:

14,100 (± 5) mm

Width

:

1,000 (± 5) mm

Height

:

1,200 (± 5) mm

Width (internal dimension)

:

288 mm

Height (internal dimension)

:

108 mm

Center Distance

:

2,050 mm

:

19.70 m3

Maximum Gross Weight

:

14,700

kgs

Maximum Payload

:

10,500

kgs

Estimated Tare Weight

:

4,200

kgs

2.2. Internal Dimension

2.3. Forklift Pocket

2.4. Inside Cubic Capacity Capacity 2.5. Ratings

©M.I.Z 2014, PT Besmindotama Semesta 2

BTS‐OB‐05

3. MATERIAL AND CONSTRUCTION

3.1. Bottom Rail Material

: ASTM A.500 Grade B or equivalent quality

Geometry

: Rectangle hollow section

Size

: 200 x 100 x t 6.0 mm

3.2. Corner Post Material

: ASTM A.500 Grade B or equivalent quality

Geometry


Size

: 100 x 100 x t 6.0 mm

3.3. Top Rail Material

: ASTM A500 Grade B or equivalent quality

Geometry


Size

: 150 x 100 x t 6.0 mm

3.4. Intermediate Post Material


Geometry

: Square hollow section

Size

: 100 x 100 x t 6.0 mm

3.5. Bracing Material


Geometry

: Square hollow section

Size

: 100 x 100 x t 6.0 mm

3.6. Forklift Pocket Material

: ASTM A.36 or equivalent quality

Geometry

: Rectangular hollow section

Size

: 250 x 120 x t 6.0 mm


BTS‐OB‐05

3.7. Base Plate Material


Geometry

: Hot rolled steel plate

Size

: t 10.0 mm

3.8. Pad Eye Material

: JIS G 3106 SM 490 YA

Geometry

: High tensile strength plate

Size

: t 32.0 mm

3.9. Pad Eye Cheek Plate

3.10.

Material


Geometry

: Hot rolled steel plate

Size

: t 6.0 mm

Properties of Steel Material Chemical Composition (%) Material

C

Si

Mn

P

S

ASTM A.36

0.14

0.18

0.71

0.016

0.005

ASTM A.500 Grade B

0.05

0.02

0.84

0.010

0.008

JIS G 3106 SM 490 YA

0.22

0.55

1.70

0.040

0.030

Mechanical Properties Material

Yield Strength min. Tensile Strength min. Elongation min. (kg/mm2) (kg/mm2) (%)

ASTM A.36

250

400

23

ASTM A.500 Grade B

317

400

23

JIS G 3106 SM 490 YA

355

490

19


BTS‐OB‐05

4. PRESERVATION 4.1.

Surface preparation of steel part

4.1.1. Prior to assembly All steel parts are pre-shot blasted and coated. 4.1.2. After assembly - Components : All

welded

areas of

exterior and interior of

assembled offshore basket. - Process

: Manual shot blasting.

- Cleaning

: All dirt, dust shot ball etc. to be completely removed before the basket enters the paint booth.

4.2.

Painting - The offshore basket is airless sprayed outside using zinc rich primer and acrylic top coat, which is the converted at 60oC. - The offshore basket is airless sprayed inside using zinc rich primer and epoxy polyamide finish, which is the converted at 60oC. - The paint system and thickness are as follows: D.F.T (Microns) Outside Epoxy zinc rich primer (Including shop primer) 40 Part

Inside

Bottom

Description

Epoxy polyamide zinc phosphate primer

40

Polyurethane top coat

40

Total D.F.T (min.)

120

Epoxy zinc rich primer (Including shop primer)

40

Epoxy polyamide zinc phosphate primer

40

Polyurethane top coat

40

Total D.F.T (min.)

120

Epoxy zinc rich primer (Including shop primer)

40

Wax. Based under coating

200

5 ©M.I.Z 2014, PT Besmindotama Semesta

BTS‐OB‐05

5. MARKING All offshore basket are to be marked in accordance with the EN 120791:2006, requirements as well as certain customers marks and logos as indicated below. The marking applied on the offshore basket will be self adhesive decal of cast vinyl and seven years life. Unless otherwise specified, all markings included in this guideline are to be in decal. 1. Owner’s code and serial number The offshore basket serial number has to be placed in accordance with owner’s requirements. 2. Weight The weight of the offshore basket is positioned on the right hand door in such a manner that no information is hidden by door hardware. The weight shown is the maximum gross weight of the Tool Box, the tare weight of the container and maximum designed cargo weight. All weights are to be expressed in kilograms and pounds. 3. Owner’s logo The owner’s logos are to be placed in accordance with owner’s requirements. 4. Other Other markings are affixed in accordance with owner’s requirements. 5. Identification plate. Identification plate is riveted on the one of the door by stainless steel blind rivets. The rivets heads and periphery of the plate are sealed by sealant except bottom area.


BTS‐OB‐05

6. TESTING AND INSPECTION 1. Proto-type Container Prototype

container

manufactured

in

accordance

with

this

specification will be tested according to the standard classification container procedures. The deflection of the components during test are measure with scaled and dial gauges. Upon completion of the test, the basket will certified by the society with a test report showing the deflection and variations within the criteria of the permissible values specified in the society’s rules. 2. Testing item and load (R) Gross Weight

= 14,700 kgs

(P) Pay Load

= 10,500 kgs

(T) Tare Weight

=

4,200 kgs

(S) Sling Weight

=

70 kgs

ITEM

TEST LOAD

1. Lifting from the top pad eye - All pad eye

2.5 x R

= 36,750 kgs

- Two pad eye diagonally

1.5 x R

= 22,050 kgs

2. Lifting from the forklift pocket

1.6 (T + S) =

6,832 kgs

3. Vertical Impact Test - Drop test

1xR


= 14,700 kgs

BTS‐OB‐05

3. Production Line Container Every container is manufactured under effective quality control procedure to meet the specified standards. After completion, all containers are subject to dimension check, door operation check and weather proof test. The offshore basket will be inspected by the surveyor of the classification society and identified with the appropriate society seal when they meet the standards of this specification.


BTS‐OB‐05

7. DESIGN CALCULATION FOR LIFTING SETS AND PAD EYE

1. Objective 

To determine quad assembly (master link & intermediate), sling & shackle.



To determine minimal required breaking strength of lifting sets and pad eye strength.

2. Design Reference 

EN 12079 Part 1 & 2:2006 and DNV 2.7-1:2013

3. Basic of Design 

Lifting Point (n)



Number of Intermediate Link

n1 = 2



Number of Master Link

n2 = 1



Tare Mass (T)

T=



Payload (P)

P = 10500 kg



Rating or Maximum gross mass (R) = T+P

R = 14700 kg



Standard acceleration of gravity (g)

g = 9.8 m/s2



Angle of sling leg from vertical (ß)

ß = 45º



Material Padeye JIS G 3106 SM 490 YA Yield Strength (C) = (Re)

n=4

4200 kg

C = Re = 355 N/mm2

Conclusion: 

If R = 14,700 kg, find the minimum required working load limit (WLLmin) WLLmin =19,200 kg


BTS‐OB‐05



Master Link Assembly Dimension: Select a master link assembly with a WLL of at least 19,200 kg Master Link size minimum1-3/8”



Sling Leg Dimension: WLLsl =

WLLmin 19200 = = 9,050 kg 3cosβ 3 cos 45 o

Select a wire rope with a WLL of at least 9,050 kg Wire rope size minimum 28 mm


BTS‐OB‐05



Shackle Dimension: WLLs =

WLLmin 19200 = = 9,050 kg 3cosβ 3 cos 45 o

Select a shackle with a WLL of at least 9,050 kg. Shackle size: 9.5 T (1-1/8”)



Shackle Information: 

Shackle Type

G-2130 S-2130



Working Load Limit

WLLs = 9500 kg



Nominal Size Shackle

Shackle 1-1/8”



Pin diameter

B = 31.8 mm



Shackle Width

A = 46 mm



Shackle Height

C = 108 mm

- Pad eye hole diameter (max.)

: DH = B + 6% B : 31.8 + (0.06 x 31.8) = 34 mm

- Pad eye thickness (min.)

: T = A x 75% : 46 x 0.75 = 34 mm



Resulting Sling Force on the pad eyes:

RSF = =


3xRxg (n  1)Cos45o

3 x14700 x9.8 = 203731 N 3Cos 45 o BTS‐OB‐05



Pad Eye Strength:



Padeye Information: Hole Diameter

:

DH

= 33 mm

Padeye Radius

:

H

= 65 mm

Check Plate Radius

:

R

= 40 mm

Plate Thickness

:

t1

= 32 mm

Total Thickness

:

t2

= 44 mm

- Tear-out Stress Ri =

3 xRSF 2 xHxt1  DHxt1

Ri =

3x203731 = 197 N/mm2 2x65x32  33x32

197 Ri = = 0.55 (maximum 0.85) Re 355

 OK

- Contact Stress Ri = 23.7 x

RSF DHxt2

Ri = 23.7 x

203731 = 280 N/mm2 33x44

280 Ri = = 0.79 (maximum 0.85) Re 355

 OK


BTS‐OB‐05

Design Calculation Offshore Basket

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