Replacing 2 PRV's(3/4" by 1 1/2" Stainless Steel) on Jet A-1 fuel storage tank inlet 8" and outlet 5" pipeline. MAWP based on the highest operating pressure reasonably expected to be encountered is 96 PSIG  (Pump deadhead pressure 87 PSIG plus 10%)
You can legally use a PRV set at up to the pressure stamped on the nameplate of your coded vessel for unfired pressure vessels as governed by ASME section III.  10% overpressure at relief, 21% overpressure during fire, and 50% overpressure (valve gagged) for Hydro-test are all addressed in the ASME rating of the vessel. 
You are not going to want to set the valves at less than 106.7 psi because once you pop a valve it is allowed to blow down to 10% below the setpoint.  You want your operating point to be less than this or you could pop the gate valve and it would stay open.  Your max operating point is 96.  96/.9 is 106.7. 

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