API SPEC 11P - Packag ed Hig h-Speed Separab le Eng ine-Dri ven Rec ipr ocat ing Gas Compressors 1. Discharge temperature - Limited to 176.7°C (350°F). 2. Vibration and critical speeds - No requirements.
3. Compressor cylinders a. Must Must be rated the greater greater of 10 percent percent or 103.4 kPa (15 (15 psi) above above discharge discharge
pressure. b. Replaceable liners preferred, but not required.
4. Cylinder cooling - As per manufacturer.
5. Pistons and piston rods - Rods shall be SAE 4140.
6. Crankshafts - No requirements.
7. Crossheads - No requirements.
8. Bearings - No requirements.
9. Distance pieces a. Drain and vent required. b. Two Two com compa partm rtmen entt dis dista tanc nce e pie piece ces s req requi uire red d ifif cra crank nkca case se and and lub lube e oil oil syst system em materials not resistant to attack from compressed gas. c. No packing vent required. 10. Packing - No requirements.
11. Lubrication a. Pressure system not required for frame. b. Cooler - provide if necessary. c. Filter - full flow if pressure lubricated. d. Forc Forced ed-f -fee eed d mec mecha hani nica call lub lubri rica cato tors rs for for cyl cylin inde derr and and pac packi king ng with with res reser ervo voir ir..
12. Guards a. Required on all moving parts. b. No requirements for outdoor guards. 13. Piping and pressure codes a. Piping per ASME B31.3. b. Lube oil piping cleaned and oiled. c . S cr cr ew ew ed ed hy hy dr dr oc oca rb rb on on pi pi pi pi ng ng 1« 1« -i-i n a nd nd le le ss ss sh sh al al l b e S ch ch 60 60 . d. Misc. piping details specified. e. Pulsation bottles per ASME SEC VIII. f. Air cooler coolers, s, shell shell and tube exchan exchanger ger design design detail details s give given n (TEMA (TEMA,, ASME ASME,, API API STD 661 not required).
14. Instrumentation a. Gauges 1. Oil pressure. 2. Gas temperature at discharge only of each cylinder. 3. No gas pressure required. 4. No oil cooler temperatures required. 5. Differential pressure for lube oil filter. 6. No water temperatures required. b. Shutdowns 1. Low oil pressure 2. Low suction pressure. 3. High suction. 4. High discharge pressure. 5. Cooler vibration.
API STD 618- Recip roc atin g Com pres sor s fo r Gener al Refi nery Servi ces 1. Discharge temperature - Limited to 148.9°C (300°F). 2. Vibration and critical speeds a. No torsional natural frequencies within 10 percent of any shaft speed and 5 percent of twice any shaft speed. b. Vendor states all critical speeds. 3. Compressor cylinders a. Must Must be rated the greater greater of 10 percent percent or 103.4 kPa (15 (15 psi) above above discharge discharge pressure. b. Horizontal cylinders with bottom discharge for saturated gases. c. Replaceable liners preferred, but not required. d. Cylinder heads, stuffing boxes, clearance pockets, and valve covers mounted with studs. 4. Cylinder cooling a. Static cooling if T d 87.8°C (190°F) and _ T 83.3°C (150°F). b. Thermosiphon if 87.8°C (190°F) T d 98.9°C (210°F) and _ T 83.3°C (150°F). c. Forced liquid if T d > 98.9°C (210°F), _ T> T> 83.3°C (150°F), or cylinder runs unloaded. d. Coolant system designed for P > 517.1 kPa (75 psig), _ P 68.9 kPa (10 psi), _ T 5.6°C (10°F) and fouling factor = 0.002. 5. Pistons and piston rods a. Pistons attached to rod by shoulder and lock nut. b. Rod positively locked to crosshead. c. Bearing load of fluorocarbon wear rings 34.5 kPa (5 psi). d. Rods shall be SAE 4140 with 50 Rockwell C hardness. e. Rod finishing specified. f. Rod load reversal required. 6. Crankshafts a. Forged or cast in one piece. b. For power > 112 kW (BHP > 150) use forged steel. c. Dynamically balanced if speed > 800 rpm. 7. Crossheads a. For power > 112 kW (BHP > 150) use forged or cast steel. b. Replaceable slides. 8. Bearings a. For power > 112 kW (BHP > 150) use replaceable main and crank. b. Replaceable bushings for crosshead pins. 9. Distance pieces a. Drain and vent required. b. Pack Packin ing g ven ventt req requi uired red..
10. Packing a. Packing glands bolted on and made of steel. b. Cooling criteria for packing gland set. 11. Lubrication a. For power > 112 kW (BHP > 150) use pressure system for frame. b. Auxiliary pump required c. Cooler details specified. d. Filt Filter er:: 1. Full flow filter. 2. 25 microns for babbitt bearings. 3. 10 microns for aluminum or microbabbitt bearings. 4. Clean _ P 34.5 kPa (5 psi). 5. Maximum design _ P > 344.7 kPa (50 psi). e. Forced-feed mechanical lubricators for cylinder and packing with sight flow lubrication, check valve, and 30-hour reservoir capacity. 12. Guards a. Required on all moving parts. b. Outdoor guards weatherproofed and ventilated. 13. Piping and pressure codes a. Piping designed to ASME B31.3. b. Charpy test for material and welds for T -28.9°C (-20°F). c. St St ai ai nl nl es ess lu lu be be oi oi l p ip ip in in g d ow ow ns nst re re am am of of fifi ltlt er er ; c ar ar bo bo n p ip in in g p ic ic kl kle d u ps pst re re am am . d. Threaded connections seal welded with two passes. e. Cast iron and malleable iron pipe, fittings, valves, strainers not allowed in pressu pressuriz rized ed flam flammabl mable or toxic toxic servic service. e. f. Piping 1« in and less shall be Sch 80. g. Miscellaneous piping details specified. h. Pulsation bottles designed to ASME B31.3. i. Shell-and-tube exchangers in accordance with TEMA Class B, C or R. For flammable or toxic gases ASME, Section VIII, Div. 1. j. Air coolers per API STD 661. 14. Instrumentation a. Gauges 1. Bearing oil header pressure. 2. Gas temperature at inlet and discharge of each stage. 3. Gas pressure at inlet and discharge of each stage. 4. Oil cooler inlet and outlet oil temperatures. September 1992 Page 81 5. Differential pressure for lube oil filter. 6. Water temperatures in and out of coolers. b. Alarms or shutdowns 1. Low oil pressure - shutdown. 2. High discharge temperature if handling air or oxygen - alarm. c. Relief valves - As required per API STD 510.
6. High scrubber level. 7. High discharge temperature each stage. c. Relief valves - No requirements. 15. Materials a. Cylinder - manufacturer's standard. b. Pressure vessels - per ASME SEC VIII. c. No corrosion allowance required on bottles. d. No miscellaneous casting requirements.
16. Tests a. Tests per code requirements. b. No helium test.
17. Pulsation design a . B ot tl es wi th 5 t im es pis to n d isp la ce me nt , i f n ot hi ng el se sp eci fi ed . b. No criteria established. 18. Guarantees a. Capacity 3 percent with P s > 5 psig b. Capacity 6 percent with P s 5 psig 19. Miscellaneous items a. Specifies scrubber design details.
15. Materials a. Cylinder - gray iron (ASTM A278) or nodular iron (ASTM A395) for MAWP up to 6895 kPa (1,000 psig). b. Cast steel (ASTM A216) for MAWP up to 17,237 kPa (2,500 psig). c. Forged steel for MAWP greater than 17,237 kPa (2,500 psig). d. Pressure vessels - per ASME SEC VIII. e. Welding - per ASME SEC IX. f. Pulsation bottles - 1/8 in corr osion allowance. g. Miscellaneous casting requirements. 16. Tests a. Hydrostatic with water to 1 1/2 MAWP for cylinders, cooling jackets, piping pressure vessels, filters, coolers, etc. b. Helium test at MAWP if MW of gas 12 or more than 0.1 mol percent H 2S in addition to hydrostatic test. c. Test maintained for 30 minutes. 17. Pulsation design a . P ur ch as er mu st sp ec if y d es ig n a pp ro ach . b. Criteria established for each approach. 18. Guarantees - No negative tolerance on capacity; that is, as a minimum, the compressor must meet specified condition of th
