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Active Contributor

Join Date: Apr 2010
Posts: 14

Violation of API RP 520 for Relief Valve

02/07/2011 10:54 PM

I know that API 520 states that if a block valve exists between two equipments that are supposed to be protecting against over pressure for both of these equipments by a common single relief valve, then this is not permissible until the block valve between the two equipments is removed. There can be block valves at the beginning of the first equipment and at the end of the second equipment. The question is if the block valve between the two equipments we are trying to protect is made "Car Seal Open", then is this still a violation of the recommend practice? My understanding is that it still is not permissible, but can someone verify this?

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Power-User

Join Date: Dec 2010
Location: Tulsa, OK
Posts: 184
Good Answers: 2
#1

Re: Violation of API RP 520 for Relief Valve

02/09/2011 7:30 AM

Generally if the block valve can be locked open, be it car seal or chained open, it is acceptable.

The biggest issue might be what are the local regulations and what are the company regulations, these could be more stringent than API

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