The Patterson self-contained Pre-Pac® Fire Pump is pre-engineered to meet, or exceed, all applicable codes. For an added measure of security, it is completely tested in accordance with NFPA 20, and all piping is hydrostatically tested. It offers a very simple hook-up to water and electricity at the job site for contractors. The system features Patterson's split case or vertical turbine pump, featuring discharge pressures of 40 to 390 psi and capacities of 150 to 5,000 gpm. Patterson Pumps. Circle 4.