High Velocity Pump

Largest NFPA Compliant Fire Pump Ever Built

The USFP High Velocity Pump (HVP) is an engine driven fire pump designed to meet NFPA 1901 performances up to 6,250 GPM from draft and more. With sufficient engine power and a pressurized water system, performance will exceed 10,000 GPM.

The key to this fire pump design is optimized flow through layout, which maximizes the pumps performance from pressurized water systems with capabilities of over 10,000 GPM. Part of this high flow design includes a 12” flanged suction inlet feeding an impeller eye, which exceeds 10″ in diameter with a discharge outlet of 8” for the 5,500 GPM unit and 10″ for the 6,250 GPM unit.

An important option designed into this pump is an auxiliary drive output to power SAE C/D hydraulic systems used to drive large foam systems or a flanged output to drive air compressors. Additional design features include optional bronze pump construction, Teflon ring mechanical seal backup, and quite helical gear transmission.

High Velocity Pump | Why Settle for Any Average Process Pump

Features and Benefits

High Velocity Pump Comparison

  • The suction inlet and discharge outlet along with the internal hydraulic configuration are designed to maximize hydrant flow through
  • The gearbox has helical class 11 gears for quiet operations and is designed for engines up to 700HP
  • The bottom drive configuration has an optional auxiliary drive port for SAE C or D application, capable of driving up to a 300 GPM foam pump
  • The largest NFPA1901 fire pump in the world, designed for the big jobs and to maximize the now available larger diesel industrial engines up to 700HP
  • Suction inlet has built-in pre-rotation baffles and is over sized to compensate for the baffles area
  • The lower drive utilizes tapered roller bearings to give maximum drive strength
  • Mechanical seal has a back up Teflon ring
  • Pump shaft is made of 17-4PH stainless steel
  • The gearbox and volute have multiple mounting pads and holes to make mounting easier

Pump End

  • Impeller – Bronze mixed flow single suction impeller with a closed shroud design with front and rear wear hubs.
  • Wear Rings – Front and rear replaceable bronze wear rings.
  • Pump Shaft – Single piece design made of 17-4PH heat treated stainless steel. Shaft is rigidly supported by a matched set of tapered roller bearings on one end and a roller bearing on the other end.
  • Seal System – Maintenance free self-adjusting mechanical seal with stainless steel spring and hardware is provided. Seal will have Viton cup and bellows seal, carbon rotating element and a tungsten carbide seat. A Teflon backup-sealing ring is supplied.
  • Volute – Single cut water, vertically split design, cast iron volute designed to be flippable to change rotation. Volute can be rotated on the 12 bolt connection in 30-degree increments.
  • Hydrostatic Rating – 500PSI per NFPA 1901
  • Hydrodynamic Rating – 300PSI
  • Volute Connections – Suction intake 12” ASA flange size and discharge is an 8” ASA flange for the 5500 GPM unit and a 10″ ASA flange for the 6000 GPM unit.
  • Inboard Head – Cast iron housing holding rear wear ring and mechanical seal seat and cup.
  • Outboard Head – Cast iron housing with 12” ASA intake flange connection, built in stabilized bushing bullet housing and pre-rotation baffles. Head also has ¾” FNPT top primer tapes positioned for optimum priming.

Integrated 3 Gearbox

  • Gear Case- – The case, top cap, end cover and tail shaft housing are made of 30,000psi fine grain cast iron. Mounting points will be provided on the top of the cap and on both lower sides of the main case.
  • Bell Housing Adapter – Designed to accommodate SAE 1 engine bell housings.
  • Bearings – Pump shaft is supported by a matched set of tapered roller bearings on one end and a roller bearing on the other end. The idler gear is supported by a matched set of tapered roller bearings. The lower drive has a matched set of tapered roller bearings and cage roller bearings support it.
  • Gears – The gears are class 11, 20 degree helical 6DP gears made of heat treated 8620 steel. With ratios available are 1:1, 1:1.26 or 1:1.51. The pinion is carried in an eccentric housing, which allows changing ratios with out replacing the main gearbox casing.
  • Oil Seals – Main drive, along with the top output, will have double lip oil seals.
  • Drive Shafts – The lower drive shaft is made of heat treated 8620-alloy steel and designed to accept a engine matching elastomeric drive coupling disc.
  • Oil Seals – The input and output drives and shafts will have double


  • Bronze and Stainless Steel volutes are available
  • Lubrication Cooler
  • Gear Case Heater
  • Hydraulic SAE “D” Auxiliary Output Drive
  • Available in 316 SS, Bronze and Cast Iron

Bronze Pump Now Available

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