Rupture disc versus PSV for HEX Tube Rupture case
Rupture disc versus PSV for HEX Tube Rupture case
(OP)
Hi all,
If I have a HEX tube rupture case, and 10/13 rule is not applied in this case for the LP side. The question is, can I install a PSV which sized for tube rupture flow? Or it is always prudent to have rupture disc installed? Does anyone know if PSV can be used for tube rupture case?
Thanks.
If I have a HEX tube rupture case, and 10/13 rule is not applied in this case for the LP side. The question is, can I install a PSV which sized for tube rupture flow? Or it is always prudent to have rupture disc installed? Does anyone know if PSV can be used for tube rupture case?
Thanks.





RE: Rupture disc versus PSV for HEX Tube Rupture case
RE: Rupture disc versus PSV for HEX Tube Rupture case
RE: Rupture disc versus PSV for HEX Tube Rupture case
Depends also on maintenance department and how often you expect the event to happen.
PSVs usually, (but not always) will reseat.
You have to weigh the operations and maintenance consequences of disk replacement versus possible valve "stuck-open"
Additionally, the PSV, if made from exotic materials can cost a whole lot more..
Your call...
-MJC
RE: Rupture disc versus PSV for HEX Tube Rupture case
Does anyone has any opinion on this?
RE: Rupture disc versus PSV for HEX Tube Rupture case
RE: Rupture disc versus PSV for HEX Tube Rupture case
RE: Rupture disc versus PSV for HEX Tube Rupture case
Your application would be governed by ASME section VIII in the US, and a PSV is acceptable to the ASME. That code is recognized as LAW in most states. It also allows for a Rupture disc. The hot setup is to use both. Put a nonfragmenting disc under a PSV. Same set pressure. If the disc bursts, the PSV pops. Then the valve reseats when the event has concluded. But during the valve's entire service life before that time it has never been exposed to the process fluid, so it should be in new condition. The code requires that you have a device between the disc and the valve to allow for (1) indication of a burst disc(2) testing of the valve. Your PSV vendor can supply this.