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Cryogenic Liquid Pump

Cryogenic Liquid Pump Manufacturer for High-Pressure Transfer of LNG and Industrial Gases

 

Reciprocating and centrifugal cryogenic pumps developed for transferring, pressurizing, and cylinder-filling applications involving liquefied industrial gases, including liquid nitrogen (LN2), liquid oxygen (LOX), liquid argon (LAr), liquid carbon dioxide (LCO2), and liquefied natural gas (LNG). Engineered to operate continuously at extreme cryogenic temperatures down to minus 196 degrees C, these units handle discharge pressures up to 35.0 MPa and flow rates up to 40 m3/h.


Manufacturing operations integrate CNC precision machining of cold-end components, automatic vacuum jacket welding, and strict oxygen-cleaning protocols compliant with ASTM G93 standards. Every pump undergoes liquid nitrogen cryogenic performance testing and cryogenic seal pressure verification prior to factory release.

 

 
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Product Types

Series

Type

Primary Application

Flow Range

Max Discharge Pressure

P200 Series

Reciprocating High-Pressure

High-pressure cylinder filling, gas pipeline vaporization supply

300 - 1200 L/h

16.5 - 35.0 MPa

SLP Series

Reciprocating Medium-Pressure

Dewar cylinder filling, liquid gas transfer, industrial skid systems

500 - 3000 L/h

2.5 - 10.0 MPa

CLP Centrifugal Series

Centrifugal Submerged/Direct-Drive

LNG/LOX/LN2 transport tanker unloading, storage tank transfer

5.0 - 40.0 m3/h

0.8 - 3.2 MPa

 

Technical Specifications

Technical Parameter

P200 High-Pressure Reciprocating

SLP Medium-Pressure Reciprocating

CLP Centrifugal Transfer

Working Media

LN2, LOX, LAr

LN2, LOX, LAr, LCO2

LN2, LOX, LAr, LNG

Flow Rate

300 - 1200 L/h

500 - 3000 L/h

5.0 - 40.0 m3/h

Max Discharge Pressure

35.0 MPa (5076 psi)

10.0 MPa (1450 psi)

3.2 MPa (464 psi)

Inlet Pressure Range

0.02 - 0.8 MPa

0.05 - 1.5 MPa

0.05 - 1.6 MPa

NPSHr

0.6 m

0.8 m

1.2 m

Cold End Material

Austenitic Stainless Steel (S30408 / S31608)

Austenitic Stainless Steel (S30408)

Stainless Steel 316L / Bronze Impeller

Piston / Seal Material

Bronze-filled PTFE / Filled Polymer Rings

Carbon-filled PTFE / Polyimide

Mechanical Seal / Submerged Cryogenic Bearings

Motor Specification

5.5 - 22 kW Ex-d IIBT4

7.5 - 30 kW Ex-d IIBT4

11 - 45 kW Ex-d IICT4

Pre-Cooling Duration

10 - 15 minutes

10 - 15 minutes

15 - 20 minutes

 

Applications
 

High-Pressure Cylinder Filling

Pressurizing liquid gas from storage tanks into high-pressure gas cylinders (15.0 to 20.0 MPa) via ambient vaporizers at industrial gas distribution stations.

LNG Station Unloading & Bunkering

High-flow unloading of liquefied natural gas from road tankers into stationary storage vessels or direct pressure boosting for LNG fuel dispensers.

Air Separation Unit (ASU) Support

Continuous transfer of liquid products from cold box separation columns to bulk storage tanks or vaporizing pipelines.

Industrial Pipeline Vaporization

Supplying continuous high-pressure gas streams to steelworks, chemical plants, and electronics manufacturing facilities through cryogenic liquid pumping into vaporizers.

 

High Capacity Liquid CO2 Cylinder Filling Pump For Cylinder Plants

 

Customization Options

Transmission & Drive Configuration: Belt drive, direct coupling, or variable frequency drive (VFD) speed control tailored to specific flow modulation needs.

 

Skid-Mounted System Integration: Complete pre-assembled skids including vacuum-insulated piping, inlet strainers, return gas lines, safety valves, explosion-proof control boxes, and temperature/pressure transmitters.

 

Seal & Packing Material Options: Customized piston ring formulations (bronze-filled, graphite-filled, or carbon-fiber PTFE) matched to non-lubricated high-purity gas or abrasive fluid conditions.

 

Instrumentation & Output Signals: PLC integration with automated pre-cooling temperature sensors, over-pressure cutoff switches, and 4-20mA pressure/vibration signal output.

 

Quality & Compliance

 

1

Oxygen Degreasing & Cleanroom Assembly

LOX-service cold end components undergo ultrasonic solvent degreasing and blacklight UV inspection to guarantee zero hydrocarbon residuals before assembly in Class 10,000 clean environments.

2

Cryogenic Nitrogen Testing

 

100 percent of manufactured cold ends undergo full-load cryogenic running tests using liquid nitrogen to verify flow capacity, discharge pressure stability, and seal integrity.

3

Dynamic Balancing & NDT

 

Impellers and crankshafts are dynamically balanced to ISO 1940 Grade G2.5; pressure-retaining castings and welds undergo 100 percent radiographic or liquid penetrant inspection.

4

Certifications

 

ISO 9001 quality management certified; electrical components and motors comply with CE/ATEX explosion-proof directives (Ex d IIB/IIC T4).

 

 

Our Certificate

 

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FAQ

 

Q: What is the average service life of cold-end piston rings and dynamic seals?

A: Under standard operating conditions with clean fluid, bronze-filled PTFE piston rings and packing sets provide 1,500 to 2,500 hours of continuous operation before replacement is required. Routine seal replacement can be performed without dismounting the entire pump drive end.

Q: How do you prevent cavitation during pump startup?

A: The pump cold end is constructed with low-NPSHr intake valves and vacuum-jacketed thermal insulation. Pre-cooling procedures vent flash gas through the return line until the liquid temperature stabilizes at the inlet, preventing vapor locks during startup.

Q: Are these cryogenic pumps suitable for liquid oxygen (LOX) service?

A: Yes. Pumps intended for LOX service undergo specialized degreasing, solvent cleaning, and strict hydrocarbon residue testing compliant with ASTM G93 standards. Assembly takes place in a dedicated oil-free clean environment using oxygen-compatible lubricants only.

Q: Can you supply complete skid-mounted pumping units rather than bare-shaft pumps?

A: Yes. We supply fully integrated skid packages including the structural base frame, cryogenic pump, VFD drive motor, vacuum-jacketed piping manifolds, safety relief valves, bypass valves, and an ATEX/CE-compliant PLC control panel.

Q: What spare parts should be kept on-site for routine maintenance?

A: We recommend stocking a standard Cold End Maintenance Kit, which includes dynamic packing sets, piston rings, suction/discharge valve discs, valve springs, and static O-rings.

Q: What documentation and test certificates accompany each pump shipment?

A: Each shipment includes a Factory Acceptance Test (FAT) Report covering flow, pressure, and cryogenic temperature readings, Material Test Reports (MTRs) for pressure-retaining parts, Cleanliness Inspection Certificate for LOX service, Ex-proof Motor Certificate, and operating manuals.

As one of the most professional cryogenic liquid pump manufacturers and suppliers in China, we're featured by quality products and good price. Please rest assured to buy advanced cryogenic liquid pump in stock here from our factory. We also accept customized orders.

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