Honeywell HON COCON 13 - Operation; Before Getting Started; Leakage Test and Setup; 1- Slam Shut Valve

Operators manual
© 2017 Honeywell International Inc.
Operators manual underground gas pressure reducing station
Type: HON COCON 13
Page 23
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4.3–Operation
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4.3.1–Beforegettingstarted
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1 Checkiftheupstream&downstreamblockvalvesareclosed.
2 Checkifthesystembetweentheblockvalvesisdepressurized.
3 Assurethattheupstreampiping&equipmenthavebeencleaned.
4 AssurethatboththeinsideoftheHONCoconbodyand
theHONCoconcartridgehavebeencheckedfor
propercleaning,anydamageandsufficientgreasing.(especiallynearsealarea's)

5 Checkinletheader,cartridgeretentionboltsforpropertightening.
6a Presetthereliefvalvebyfullyturninginward(CW)thepressureadjustingscrew.(ifapplicable)
6b Checkiftheuppertrip
valueoftheslam‐shuthasbeenset,otherwiseturntheadjustmentscrewfullyinward
(CW).
6c Checkifthelowertripvalueoftheslam‐shuthasbeenset,otherwiseturntheadjustmentscrewfully
outward(CCW)
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7 Relaxpressurespringofpilotregulator(s)byfullybackingoutthe
adjustscreworremovalofthecap,spring
cupandspring.
8 Providethedischargelineofthereliefvalvewithanopeningindicator(eg.bysubmergingatubeinwater)
9 Checkifboththepurgevalvesareclosed
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4.3.2–Leakagetest& Setup
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4.3.2.1–Slam
ShutValve
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Startat4.3.1(firsttimeonly)
 
1 Closetheisolationvalves.
2 Closethessdvalvebyusingthemanualoverride(pushtheemergency‐button).
3 Open&closeboththepurgevalvestodepressurizethemodule.
4 Failtheregulatoropenbyadvancingtheadjustscrews(CW)
untilalittlespringtensionbuildsup.

5 Checktheupstream&downstreampressuresonthegaugesprovidedforlockupofblockvalves.
6 CracktheupstreamblockvalveandtheupstreamisolationvalveoftheHONCocon.
7 Checkthedownstreampressureforlockup.
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8 Relatchthessdcontroller,
enableresetbypresettingthedownstreampressureabovethelowertripvalueof
theSSVbyadvancingtheadjustscrew(CW)oftheregulatorpilot.
9 DecreasethedownstreampressuretothedesiredlowertripvalueoftheSSV(openthepurgevalve)by
backingouttheadjustscrew(CW)of
theregulatorpilot.
10 Slowlyincreasethetrippressurespringtensionofthessdvalvebyadvancingtheadjustscrewofthe
controller(CW)untilthetripmechanismisactivated.
11 Relatchthessdcontroller(takenoteoftheminimalrelatchingdifferential)byfirstadvancingtheadjust
screwofthe
regulatorpilotandthenincreasingthedownstreampressure,closethepurgevalve.Equalize
pressureovertheclosingmemberbyusingthebuilt‐inbypass(pushthereset‐buttonaspreviously
described)FinallyrelatchtheSSVbypushingthebuttonallthewaytoitsstop(pushtwice)

12 Re‐checkthe
lowertrippressureandfine‐adjustifnecessarybyrepeatingactions9to11
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13 IncreasethedownstreampressuretothedesireduppertripvalueoftheSSV(donotopenthepurgevalve)
byadvancingtheadjustscrew(CW)oftheregulatorpilot.

14 Slowlydecreasethetrippressure
springtensionofthessdvalvebybackingouttheadjustscrewofthe
controller(CCW)untilthetripmechanismisactivated