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.
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DB500-PGN-2
