Pump assembly

A pump assembly for use in fire fighting service and adapted to be mounted on a mobile unit such as a fire truck comprising:

• a main pump having an impeller means, a suction to the impeller means, and a discharge from the impeller means,
• means for connecting the discharge of said main pump to a first high flow rate fire fighting application,
• a booster pump having an impeller means, an inlet to the booster pump impeller means, and a discharge from the booster pump impeller means,
• means for connecting the discharge of said booster pump to a second fire fighting application,
• means for connecting the discharge from said main pump to the inlet of said booster pump, and
• drive means for said main pump and said booster pump including rotating pump shaft means,
• said main pump impeller means being mounted on one portion of said shaft means so as to be driven thereby, and said booster pump impeller means being mounted on another portion of said shaft means so as to be driven thereby, valve means for controlling the flow through said main pump and booster pump discharges and operable to flow control positions in which flow is permitted through either of said discharges only or through both of said discharges concurrently, said booster pump discharge being connected to a low flow high pressure second fire fighting application such as a hose reel and said first fire fighting application comprises a fire hose, said main pump being a single stage centrifugal pump constructed to deliver water to said first fire fighting application and to said booster pump inlet at a first pressure, and said booster pump being a two stage centrifugal pump designed to deliver water to said second fire fighting application at a second pressure substantially higher than said first pressure, the volute and the impellers of said booster pump being hydraulically designed to pump water optimumly at low volume and high pressure.

A pump assembly for use in fire fighting service and adapted to be mounted on a mobile unit such as a fire truck comprising:

• a main pump having an impeller means, a suction to the impeller means, and a discharge from the impeller means,
• means for connecting the discharge of said main pump to a first high flow rate fire fighting application,
• a booster pump having an impeller means, an inlet to the booster pump impeller means, and a discharge from the booster pump impeller means,
• means for connecting the discharge of said booster pump to a second fire fighting application,
• means for connecting the discharge from said main pump to the inlet of said booster pump, and
• drive means for said main pump and said booster pump including rotating pump shaft means,
• said main pump impeller means being mounted on one portion of said shaft means so as to be driven thereby, and said booster pump impeller means being mounted on another portion of said shaft means so as to be driven thereby, valve means for controlling the flow through said main pump and booster pump discharges and operable to flow control positions in which flow is permitted through either of said discharges only or through both of said discharges concurrently, a recirculating flow connection from said booster pump back to said main pump to provide for a recirculating flow of liquid from said main pump to said booster pump and back again to said main pump by a recirculating path including said means for connecting the discharge from the main pump to the inlet of said booster pump and said recirculating flow connection.