Nikkiso Clean Energy & Industrial Gases Group

Products & Services

Cryogenic Pumps

Centrifugal Pump

The AC/TC34 pump assemblies are a vertically oriented, two- or four-stage, close coupled pump. They are mounted directly on the drive motor. All of  which is contained within a sump. The motor is designed to be flooded with the liquid being pumped. And, the motor is specifically designed for Variable Frequency Drive (VFD) applications. The bearings are cooled by the liquid being pumped; for the bearing nearer the impeller, the liquid flows from behind the second stage impeller, while the far end bearing receives flow through a drilled orifice in the discharge manifold.

Features & Benefits

  • Gastight design – use where product loss is not acceptable
  • Pump and motor are fully submerged in liquid, minimizing loss and guaranteeing quick response pumping
  • Vacuum jacketed sump provides extremely low heat leak – ideal pumping conditions (optional)
  • Sealless & submerged design minimizes maintenance requirements
  • Vertical pump design provides greater stability & longer life
  • Specially designed VFD motor provides broad range of operation


  • Liquid Storage transfer
  • Mobile Fueling
  • Fuel Loading
  • Boost Pump
  • Low Pressure Fuel Systems

Liquids Pumped

  • Nitrogen
  • Oxygen
  • Argon
  • Methane (LNG)

AC/TC34 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


  • Optional accessories include:
    • Vacuum jacketed sump
    • Variable frequency drive
    • Differential pressure gauge
    • Loss of prime detector (cavitation protection)
    • Safety relief valve
    • Dual conduit box per NFPA standards for LNG service

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