Nikkiso Clean Energy & Industrial Gases Group

Products & Services

Cryogenic Pumps

Centrifugal Pump

Our AC-32 pump assembly is a vertically oriented, single-stage, close coupled pump and is mounted directly on the drive motor. It is designed to be flooded with the liquid being pumped. No sump is required for operation. The bearings are cooled and lubricated by the fluid being pumped. Also, the inducer provides quicker and more reliable priming. The motor is specifically designed for Variable Frequency Drive. A VFD allows the pump speed to be tailored to the specific service, thus providing best efficiency.

Features & Benefits

  • Minimal start-up & downtime with guaranteed quick, responsive pumping
  • No mechanical seal – minimizes maintenance costs
  • No sump required – lowers cost
  • Multi-frequency motor provides an efficient, broad range of operation & power
  • Electrical motor & bearing life is extended being cooled by cryogen it is pumping – heat input is minimal & carried off by discharging liquid
  • Low NPSH inducer coupled with variable speed soft start motor eliminates cavitation at pump start-up
  • Zero-leakage design environmentally safe, releasing no volatile organic chemicals or contaminants (VOC’s) into the atmosphere


  • Liquid Storage transfer
  • LNG
  • Fuel Loading
  • Storage Tank Refilling
  • Pipeline
  • Peak-shaving

Liquids Pumped

  • Nitrogen
  • Argon
  • Ethane
  • Ethylene (C2H2)
  • Methane (LNG)

AC-32 Pump Table

Flow Rate Max.1000³/h (4400 gpm)
Head max.600m (1,970 ft)
Fluid Temperature
-130℃ to +450℃ (-201 to 842°F)
Viscosity Max.500mPa·s
Design Pressure:20MPa (2900 psig)
Casing Material

Austenitic Stainless steel (304SS, 316SS, etc.)
Hastelloy*1 C/B Equivalent Alloy
Monel*2, others Equivalent Alloy

Motor power range0.75 to 250kW
Ex-ProtectionVarious international explosion-protection (ATEX,IEC,CSA,TRCU, etc.) CE marking


  • Suitable for Class I, Div I (IEC Zone 0 and 1)
  • Pass-thru connection

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