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ISSUE

Water ingress to COBRA scrubber

A client reported water ingress to the scrubber on a COBRA set.  JFD inititally replaced the 
Hot Water Housing (as it was thought the fault occurred in this component) but the clients own 
investigations revealed an incorrectly set hot water PRV.  The incorrectly set PRV failed to protect 
the COBRA set from excessive hot water pressure and this caused the inner liner of the hot water 
housing to deform and lose contact with the sealing o-ring.  As a result hot water leaked into the 
scrubber housing.

SOLUTION

Following a thorough review and investigation of the hot water PRV, JFD recommend 
resetting the relief valve to open at 3 psi (rather than 4 psi as previously advised in the manual) and 
checking the setting fortnightly thereafter. 

 

Please see following pages for procedure.

COBRA Bailout System

23 May 2019

Page 1 of 3

ADVISORY NOTICE

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Background

A client reported water ingress 
to the COBRA scrubber.  Their 
own investigations discovered the 
cause to be excessive hot water 
pressure due to an incorrectly 
set relief valve in the COBRA hot 
water system.

Copyright © JFD Limited 2019
DB500-PGN-2

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