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NP-400 Liquid Nitrogen Triplex Pump

The unit is specifically designed to deliver high flow rates at high pressure while providing exceptional low flow rate turndown. The pump uses low-friction roller bearings and a pressure feed lubrication system for positive lubrication, ensuring increased pump life over conventional pumps.

  • Description Description
  • Ruler Specifications

Our NP-400 pump satisfies the market requirement for high-pressure pumping rates up to 467,000 SCFH.

The NP-400 pump is a medium-rate version of the NP-1000 pump that has proven its durability for years. This new design approach uses low-friction roller bearings rather than journal bearings to significantly enhance durability—particularly at low speeds at which other pumps using journal bearings are most vulnerable. The NP-400 design also operates at a much cooler temperature.

This pump has a simplified design and is internally balanced on each cylinder for smooth pumping operation. The maximum rod load is 42,000 lb, enabling 15,000 psi working pressure at rates up to 324,000 SCFH.


NP-400 Liquid Nitrogen Triplex Pump Specifications

Cold-end diameter 1.875 in. (4.7625 cm) 2 in. (5.08 cm) 2.25 in. (5.715 cm)
Number of pistons 3
Stroke length 2.00 in. (5.80 cm)
Weight without cold ends and lube oil 1,975 in. (898 cm)
Length 35.0 in. (88.9 cm)
Width 39.0 in. (99.1 cm)
Height 21.0 in. (53.3 cm)
Gearbox Available
Maximum RPM 900
Operation characteristics at 90% volumetric
Maximum flow 64 gal/min (244 L/min) 73 gal/min (278 L/min) 93 gal/min (352 L/min)
Maximum flow 324,000 SCFH (9200 m3/hr) 369,000 SCFH (10 400 m3/hr) 467,000 SCFH (13 200 m3/hr)
Maximum pressure 15,000 psi (103 MPa) 13,000 psi (89.6 MPa) 10,000 psi (68.9 MPa)

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