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Manifolded Atmospheric Tank Pressure Relief

Manifolded Atmospheric Tank Pressure Relief

Manifolded Atmospheric Tank Pressure Relief

(OP)
I have six tanks that are manifolded together for a blanket gas / vapor recovery system.  The tanks have various MAWP and MAWV ratings.

#1  
When considering relief, should the relief valves for normal venting/vacuum and/or emergency venting be set for the tank with the lowest MAWP/MAWV, "the weakest link".  

#2
When considering a tank with a frangible roof (per API 650), API 2000 allows you take credit for it, in lieu of an emergency relief valve/hatch.  (Normal venting & vacuum still applies)  My question is, in a system of tanks manifolded together, how do you assume/calculate the pressure that the tank with the frangible roof would accumulate in an emergency (fire)?  The reason why I'm concerned is if the accumulated pressure is somewhere at 7 inches of water column (IWC), and a nearby manifolded tank has a MAWP of 2 IWC - couldn't I have an overpressure scenario for the lower MAWP tank?

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