Selecting a Centrifugal Pump for High Pressure Circulation in a Closed System

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SUMMARY

The discussion focuses on selecting a centrifugal pump for a closed system that circulates water under high pressure, specifically with a nitrogen influence at 10 bars. The manual specifies a pump with a head of 20 meters and a flow rate of 12 m³/h. Participants confirm that while the pump is rated for normal operation, it must be constructed with materials capable of withstanding high pressure, and a mechanical seal is preferred over gland packing to prevent leaks. Additionally, compliance with ASME B31.1 and B31.3 piping codes is essential for safety and functionality.

PREREQUISITES
  • Understanding of centrifugal pump specifications, including head and flow rate.
  • Knowledge of pressure ratings and mechanical seals versus gland packing.
  • Familiarity with ASME B31.1 and B31.3 piping codes.
  • Basic principles of fluid dynamics in closed systems.
NEXT STEPS
  • Research materials suitable for high-pressure centrifugal pump casings and impellers.
  • Learn about the installation and function of pressure relief valves in closed systems.
  • Study the implications of nitrogen gas on fluid dynamics in pressurized systems.
  • Explore centrifugal pump selection criteria for high-pressure applications.
USEFUL FOR

Engineers, pump selection specialists, and system designers involved in high-pressure fluid circulation systems will benefit from this discussion.

maxx_payne
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dear guys
how are u ??
i ve a problem with selecting a centrifugal pump for circulating water in a closed system this system consists of tank , pipes up to 60 meters with 2 inch dia , then these pipes deliver water to a tube contains pressurized nitrogen @ 10 bars then return back to tank and also at the same time this nitrogen also affect on the water free surface inside the tank with 10 bars also

i hope i have descriped the system clearly so guys tell me the manual says that this pump is 20m of head and 12m3/hr flow
so what do u think the characteristics of this pump
i think this pump is a normal pump 12 m3/h and 20 m but can withstand high pressure up tp 10 bars because the pressure is acting on both suction and delivery sides also this pump should have mechanical seal not galand packing to avoid leaking
am i correct or not ?
 
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Your pump casing design pressure should be the max design inlet suction pressure added to the pump shutoff (zero flow) pressure rise.

If your system is unable to handle this pressure, the piping codes (ASME B31.1 and B31.3) allow you to install a pressure relief valve.
 
thanx edgepflow
so the pump selection will be a normal pump but the materials of casing and impeller should withstand this high pressure
 

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