psv fire case scenario requirement

[saidin]

hi, I want to check if the fire case scenario is required for psv for my skid? the medium is only sea water for water treatment which no heater involved. we have vassel made from plastic, the max design temp for this vassel is 49 degc and to be tie in with this psv.

the location is in offshore and the environment might have external fire due to location in hazadous location..
your advise is much appreciated.

thus, my question is.. fire case scenario for this sizing is applicable?

 

[TiCl4]

1st - Do I detect a Wheel of Time fan?

2nd - What material is this tank? HDPE? If so, the melting point is ~110 C. The vessel will very likely melt during a fire, long before over-pressure becomes a concern.

IBCs are made from HDPE as well. Look what happens during a small fire exposure:

https://www.youtube.com/watch?v=eF48jq2-b5o

 

[The Obturator]

Are you sure that 'Plastic' as the material of a significant piece of equipment (vessel), is acceptable for use in the stated offshore environment? Flammable plastics are generally prohibited for use on offshores structures such as in UK/Norwegian waters etc..

To better answer your question, provide more details such as design code/standard and a general explanation of your system. A schematic can help also.



*** Per ISO-4126, the generic term 'Safety Valve' is used regardless of application or design ***

*** 'Pressure-relief Valve' is the equivalent ASME/API term ***

 

[don1980]

The equipment owner gets to decide whether or not a fire-sized relief design is needed. In this case the answer is obviously "no" because the plastic vessel is incapable of being protected from fire exposure. If the owner decides this isn't an acceptable situation, then they need to replace the plastic vessel with a metallic vessel. Once that's done, they can proceed with sizing the relief device for fire exposure, if that's what they want to do.