Evaluating sustained load case in FIRE Condition

[Qaci]

Hello guys,
I have a FIRE condition, and I should extract reactions in the support at W+P1+T_fire, but I'm wondering if it's necessary to analyse a sustained case corresponding to Tfire, knowing that I don't have nonlinear restraints
Many thanks

 

[goutam_freelance]

The fire protection system is typically designed for the protection of occupants and buildings. Also, the equipment can be protected up to a certain extent.

Referring to ISO 834 fire temperature curve, the temperature can reach about 1000 deg C after 1 hour. It may be futile to try a long-duration protection of pipes after such a fire. To cover the expenses against such an incident, we have fire insurance.

However, to a limited extent, the piping can be protected. B31.1 allows a factor of 3 for allowable stress range S_A, refer to 102.3.2 (b) (2) for non-cyclic thermal displacement.

Again, the degree of protection required will be determined by AHJ as per NFPA.

 

[GD2]

Hello guys,
I have a FIRE condition, and I should extract reactions in the support at W+P1+T_fire, but I'm wondering if it's necessary to analyse a sustained case corresponding to Tfire, knowing that I don't have nonlinear restraints
Many thanks

There is no Fire Load Case given in ASME BPVC Code. Usually, after a fire event, you/your company has to initiate a FFS. Essentially, it will be assessment of mechanical properties of components subject to heat exposure and re-rating/replacement if required.
You need to call an expert third party who does FFS.