Heavy Duty Balanced Opposed Compressors
Heavy Duty Balanced Opposed Compressors
Heavy Duty Balanced Opposed Compressors
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FOR MODELS: JG AND JGA SECTION 3 - START UP<br />
Relief Valve Settings<br />
It is the responsibility of the packager to provide relief valves for every stage of compression<br />
in compliance with API SPEC 11P, paragraph 7.20.3, as follows:<br />
"Relief valve setting shall take into consideration all possible types of equipment<br />
failure and the protection of the lowest pressure rated component in any continuous<br />
system. Relief valves shall be set to operate at not more than the maximum<br />
allowable working pressures but not less than the values following:<br />
System Discharge Relief Valve Margin<br />
Pressure Above System<br />
psig (kPa) Discharge Pressure<br />
-14.7 to 150 (-101 to 1034) 15 PSI (100 kPa)<br />
151 to 2500 (1035 to 17 237) 10%<br />
2501 to 3500 (17 238 to 24 132) 8%<br />
3501 to 5000 (24 133 to 34 474) 6%<br />
NOTE: For rated discharge pressures above 5000 psig (34 474 kPa), the relief<br />
valve setting shall be agreed upon between the purchaser and the vendor.”<br />
!<br />
CAUTION<br />
WHEN A BYPASS IS FURNISHED, A RELIEF VALVE MUST<br />
BE INSTALLED IMMEDIATELY DOWNSTREAM OF THE<br />
BYPASS VALVE OR ON THE INLET SCRUBBER OF THE<br />
DOWNSTREAM CYLINDER. THIS RELIEF VALVE MUST BE<br />
SET FOR THE MAXIMUM ALLOWABLE WORKING PRES-<br />
SURE OF THE CYLINDER WHICH HAS THE LOWEST MAWP<br />
OF THOSE IN THE BYPASS CIRCUT. THIS IS TO PROTECT<br />
AGAINST DISCHARGE-CHECK VALVE FAILURE WHEN<br />
OPERATING ON BYPASS. (SEE ARIEL PACKAGER’S STAN-<br />
DARDS, SECTION 4.4 “RELIEF VALVES”).<br />
11/01 PAGE 3 - 7
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