Dear Fellow Engineers,
I am writing to get your opinion on the fire case PSVs on the exchanges with one particular Project. We have AEU type shell & tube exchangers and Compabloc type frame and plate exchanges. Per Client's Standard (attached), exchangers with large gaskets and bolts tend to self-relieve during fire, thus, only fire thermal relief is required. Otherwise, regular fire vapor generation is required.
For AEU type, there are no flanges / gaskets in the rear part. For Combaloc type, the plates are welled and no gaskets between plates. I prefer to use the more conservative fire vapor generation method, which gives larger PSV sizes. My lead insists to use the fire thermal method, which required only a ¾” thermal relief valves.
Here is the link to the Compabloc exchanger for your reference:
https://www.alfalava...gers/compabloc/