H2 deflagration

[Bill3752]

I have a reactor consuming hydrogen. The MAWP is 90 psig. The NFPA Pmax ~ 87 psig and Pred ~136 psig. Because the Pmax is lower than the MAWP, does this mean that the vessel will contain a deflagration - i.e. that we do not need to install rupture discs for this scenario?

 

[georgeverghese]

What about transient pressure caused by detonation ? - this will be much higher than deflagration generated pressures