Pressure pump with volumetric leak rate detector

Claim 1

A pressure pump with volumetric leak rate detector, comprising, in combination, a level testing unit, a pressure vacuum pump and a safety can connected together by a piping system, and said piping system including means for connection to an underground installed piping system; said level testing unit comprising a tank, a hydraulic cylinder mounted inside a lower end of said tank, a spring biased piston inside said cylinder forming a lower and an upper chamber in said cylinder, a first pipe of said piping system communicating with said lower chamber, said upper chamber freely communicating with an interior of said tank, a piston rod of said piston being tubular and connected to a flexible hose extending outwardly of said tank for exterior communication of said lower chamber, a vent valve on said hose and a vent valve on said tank, and said tank having a lower sight glass for reading a fluid level inside said tank; a second pipe of said piping system being connected to said pressure vacuum pump; and a third pipe of said piping system being connected to said safety can; and said piping system including a plurality of guages, and a plurality of valves and check valves for selective communication between said level testing unit, said pressure vacuum pump, said can and said underground installed piping system.