Fireproofing of PSVs

[hg_55]

In what cases PSVs designed for fire cases can be fireproofed? Our process engineers have recommended us to apply fireproofing on some PSVs. What can be the driving factors?

[luca]

Some facilities require equipment to remain functional for 30 minutes, 60 minutes, 120 minutes, depending on evacuation philosophy.
If a PSV is needed to continue relieving pressure during prolonged fire exposure, fireproofing may help preserve its mechanical integrity.

[opo21]

If your process engineers have recommended fireproofing only for selected PSVs, they may have identified one or more of the following during the design or risk assessment:

Jet fire exposure -Very high heat flux can impair PSV operation before it relieves effectively.
Proximity to high-pressure hydrocarbon equipment -Greater likelihood of direct flame impingement.
Deluge system limitations -Passive protection compensates where active fire protection may not be sufficient.
Long emergency response or depressuring time -PSV must remain functional for an extended duration.
Critical service (e.g., toxic, hydrogen, sour gas) -Higher consequences if the PSV fails to operate.
Pilot-operated or bellows PSV -More heat-sensitive internal components.
Escalation prevention -Ensures continued overpressure protection of adjacent equipment during a major fire.

[sys1]

That must have been recommended to reduce the thermal load when there is an actual call in fire case scenario.
Fireproofed assets would support reducing that load.