Ariel JGJ Series, Technical Manual

Page: 41 / 141

F
OR
M
ODELS
: JGW, JGR
AND
JGJ S
ECTION
3 - S
TART
U
P
1/01 PAGE 3 - 7
Relief Valve Settings
It is the responsibility of the packager to provide relief valves for every stage of com-
pression in compliance with API SPEC 11P, paragraph 7.20.3, as follows:
"Relief valve setting shall take into consideration all possible types of equipment
failure and the protection of the lowest pressure rated component in any contin-
uous system. Relief valves shall be set to operate at not more than the maxi-
mum allowable working pressures but not less than the values following:
System Discharge Relief Valve Margin
Pressure Above System
psig (kPa) Discharge Pressure
-14.7 to 150 (-101 to 1034) 15 PSI (100 kPa)
151 to 2500 (1035 to 17 237) 10%
2501 to 3500 (17 238 to 24 132) 8%
3501 to 5000 (24 133 to 34 474) 6%
NOTE: For rated discharge pressures above 5000 psig (34 474 kPa), the relief
valve setting shall be agreed upon between the purchaser and the vendor.”
CAUTION
WHEN A BYPASS IS FURNISHED, A RELIEF VALVE MUST
BE INSTALLED IMMEDIATELY DOWNSTREAM OF THE
BYPASS VALVE OR ON THE INLET SCRUBBER OF THE
DOWNSTREAM CYLINDER. THIS RELIEF VALVE MUST BE
SET FOR THE MAXIMUM ALLOWABLE WORKING PRES-
SURE OF THE CYLINDER WHICH HAS THE LOWEST MAWP
OF THOSE IN THE BYPASS CIRCUIT. THIS IS TO PROTECT
AGAINST DISCHARGE-CHECK VALVE FAILURE WHEN
OPERATING ON BYPASS. (SEE ARIEL PACKAGER’S STAN-
DARDS, SECTION 4.4 “RELIEF VALVES”).
!