Certain of Circor Aerospace Unit’s 8100 Series Devices Affected
Circle Seal Controls, working with the National Highway Traffic Safety Administration, has initiated a recall of certain of its 8100 series pressure relief devices for compressed natural gas fuel systems.
Circle Seal, which is a unit of Circor Aerospace, says the problem could cause CNG fuel leaks in cold weather.
“Failure, which can occur at low temperatures,” the firm has told customers, “could result in the leakage of CNG and a consequent safety hazard if such leakage occurs in an enclosed environment.”
‘The O-Ring May Fail at Temperatures of 20F and Below’
The PRD models were manufactured between July 2011 and December 2013, Circle Seal says, and “might fail at temperatures of minus-5F and below under normal operating conditions due to an apparent problem with an O-ring used in the PRD.
“In addition,” states the bulletin to customers, “in the unlikely scenario that a CNG tank is completely emptied and then refilled at low temperatures, the O-ring may fail at temperatures of 20F and below.
“Such a scenario, although generally very unlikely, is most likely to occur with ‘dual fuel vehicles’ that are capable of running either on CNG and petroleum since an operator could run the CNG tank completely dry and then switch to petroleum before refilling the CNG tank.”
Circle Seal is preparing replacement parts and has established 951-270-6231 as a dedicated telephone line for questions related to the PRD recall.
As many as 67,416 units may be affected, NHTSA says.
Contact information is only available to premium subscribers. Click here to purchase a subscription.
Source: NHTSA with Fleets & Fuels follow-up