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HDP 250 L

Hammelmann high pressure pumps are built to operate at the continuous maximum duty stated in the performance parameters. Operating pressure and flow rate determine the power and pump selection. We can offer a large number of combinations to meet specific requirements.

Bare shaft pump HDP 250 L

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Performance parameters

  • Power rating up to 335 hp
  • Operating pressure up to 43,500 psi
  • Flow rate up to 202.2 gpm

  • Rod force: 18,430 lbf
  • Stroke: 2.95 inch
  • Mean piston speed at n2:
    390 r.p.m. = 3.2 feet/sec
    465 r.p.m. = 3.8 feet/sec
    555 r.p.m. = 4.6 feet/sec

  • Dimensions: 45.4 inch (length) x 40.6 inch (width)  x 17.9 inch (height) (horizontal)
  • Weight: approx. 2300 lbs

Hammelmann plunger pumps convert 93 to 98 % of the shaft power to hydraulic energy.



  • Horizontal 5 cylinder design
  • Wide variety of complementary ancillaries

Quality and reliability

  • Stainless steel pump head free of alternating stress
  • Cross head piston bellows seal
  • Choice of application specific seal assemblies
  • Solid ceramic or tungsten carbide plungers
  • Choice of bronze or stainless steel suction chamber
  • Crank section calculation by ‘Finite element method’ ensures long working life under continuous load
  • Crankshaft supported by 3 bearings and incorporating twin helical speed reducing gears
  • Pressurised oil lubrication system with oil cooler/filter