Filter design-Safety relief valve

[santeilam]

hello

i have designed a new filter for our diesel products in our loading facilities but i am confused about the installation of the safety relief valve.

According to exxon design practices , a vessel with Diam>600mm , V>600L must have installed a safety relief valve for fire contigency. In case that Diam<600mm and V<600L and made of pipe parts and it is not characterised as a vessel, it may not have a safety relief valve in case of fire contigency. So i designed a filter with smaller dimensions because in our offsites facilities (which are away from the refinery) do not have a flare in order to discharge the product safely in case of fire.

However a constructor can construct the case of the filter according to asme viii vessel code (which means its characterised as a vessel).

what should i do about the safety relief valve?
where to discharge the product, where in case of fire it has 300 oC ?

thank you

 

[LittleInch]

I'm sure the exxon design manual covers this. you say that if a vessel is > 600 diam and > 600l it needs a relief, then if its a vessel with less than that it doesn't.

I'm not familiar with exxon design practice so you need to read it carefully, but in these instances it is rare to find a pressure relief. If you have one then you need to pipe it to closed drain vessel / sump. You don't need a flare for a liquid system.



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[SNORGY]

Be careful with sizing for fire in this case, because the issue that is probably going to come up is interpreting NFPA and API 521 to determine how much piping volume and surface area needs to be included that contributes to the relief scenario. If it's a relief valve intended only to protect the filter because the filter itself is nameplated to the ASME VIII Code, try to rationalize things in such a way that *thermal* is the sizing basis, as opposed to *fire*. Otherwise, you will end up with a potentially large relief valve that is, in effect, protecting the *piping* in the fire case, which might make it more of a monument than it needs to be.