I wanna start two 6000 gpm pumps which have C27 airstart engines. please help in selecting air compressor.?

C27 cat engine needs to be started. Cat people say the air consumption of the air starter is 0.3 m3/sec at 862 kPag. Now my question, i want to use the smallest compressor may be with an air vessel and start two engines at a time. The vessel needs to be mounted onthe compressor. Also, the pump is a fire pump which is skid mounted and not stationery.