Patent ID: 7066353

Claim:
An injection system comprising, a source of pressurized fluid, a source of chemical additive ( 56 ), a delivery line ( 62 ) having an inlet fluidly coupled to said source of pressurized fluid and an outlet, a flow meter ( 42 ) fluidly coupled in said delivery line, a hydraulic prime mover ( 24 , 19 ) fluidly coupled between a first point (A) of said delivery line upstream of said flow meter and a low pressure region ( 52 ), a metering pump ( 27 , 28 ) mechanically coupled to said hydraulic prime mover ( 24 , 19 ) and fluidly coupled between said source of chemical additive and a second point (B) of said delivery line downstream of said flow meter ( 42 ), and a control system ( 40 , 30 ) coupled between said flow meter ( 42 ) and said prime mover ( 24 , 19 ), said control system arranged and designed to control said prime mover as a function of the level of fluid flow measured by said flow meter ( 42 ).