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JFD COBRA Advisory Notice

Bailout system

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COBRA Bailout System

23 May 2019

Page 1 of 3

ADVISORY NOTICE

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.

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.

DB500-PGN-2

jfdglobal.com

enquiries@jfdglobal.com

Page 1 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.
Page 2 Fit the test plug (DB5003843), test nut (DB5003844) and o-ring (E13330) to the hot water relief valve DB5002335 as shown in figure 1. These items are contained in the COBRA Tool and Test Kit. Fit a 3/8” UNF plug to the outlet of the relief valve.
Page 3 JFD are currently undertaking work to improve the flow capacity of the relief valve. This will ensure that the COBRA set is protected from overpressure, even if the COBRA set hot water outlet is totally blocked for any reason. A further guidance note and replacement parts will be issued in the near future to allow clients to carry out this modification.