Reciprocating cryogenic pumps SDPD

Reciprocating cryogenic pumps SDPD are designed for cylinders and buffer vessels filling under a pressure of up to 420 bar.

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Each pump is mechanically and cryogenically tested prior to its delivery. Such tests ensure the greatest productivity, which meets Customer’s requirements.

Thanks to the precise diagnosis of measuring devices, necessary results are achieved:

  • differential pressure;
  • flow velocity;
  • tightness;
  • pump efficiency;
  • the height of the liquid column above the suction port of the pump;
  • noise and vibration levels.

Peculiarities of SDPD cryogenic pumps:

  1. The cold end is slanted upwards by 10 o, thus improving degassing of the pump cylinder and preventing accumulation of gas in the suction chamber prior to start-up and during operation. 
  2. Thanks to the excellent vacuum insulation, the lowest temperature is kept in the pump body, and the liquid is available for an instant re-start (without venting).
  3. The suction chamber is designed to separate any flash gas from the incoming liquid, assuring a homogeneous flow of cold liquid into the cylinder.
  4. The straight inflow suction valve provides the best possible low resistance flow characteristic, ensuring a low NPSH requirement. (large diameter of the inflow suction valve.
  5. The thin"hat" seal rings remain flexible even at extremely low temperatures.
  6. The cold end is either screwed in, or bolted to an intermediate piece. This open distance piece serves as a cold break between the cylinder and the crank drive. 
  7. Both the crank drive and the intermediate part have connections for an optional nitrogen purge.  
  8. Thermosiphon tank suction valve execution (option), allowing for a shorter cool down period as well as reduced losses.
  9. Piston head made of bronze allowing a safer operation.
Applications сylinder and buffer tank filling
Liquids pumped oxygen, nitrogen, argon, carbon dioxide, liquefied natural gas (LNG), nitrous oxide
Drive type grease lubricated crank drive
Design pressure SDPD 22/20: up to 420 bar, SDPD 30/20, 30/32: up to 280 bar
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