How to calculate NPIPA & NPIPR for PD pumps

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SUMMARY

The discussion focuses on calculating NPIPA (Net Positive Inlet Pressure Available) and NPIPR (Net Positive Inlet Pressure Required) for positive displacement (PD) oil pumps. Participants emphasize the importance of suction conditions for optimal pump performance and reference an article that clarifies the relationship between these parameters and the more commonly known NPSH (Net Positive Suction Head) and NPSHR (Net Positive Suction Head Required) in centrifugal pumps. The article provided by Fred serves as a valuable resource for understanding these calculations.

PREREQUISITES
  • Understanding of positive displacement pump mechanics
  • Familiarity with NPSH and NPSHR concepts
  • Basic knowledge of fluid dynamics
  • Experience with pump performance testing
NEXT STEPS
  • Review the article on testing PD pumps for detailed formulas and methodologies
  • Study the relationship between NPSH and NPIPA/NPIPR in pump applications
  • Explore fluid dynamics principles relevant to pump suction conditions
  • Investigate software tools for simulating pump performance under varying conditions
USEFUL FOR

Engineers, pump system designers, and technicians involved in the selection and optimization of positive displacement pumps will benefit from this discussion.

jaybikes
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How do I determine NPIPA and NPIPR for PD oil pumps. I understand from limited research that suction condition is critical to the success of each application, but I do not know the formulas.
 
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Have you taken a look through this article? The parameters you are looking for are analagous to NPSH and NPSHR in centrifs.

http://findarticles.com/p/articles/mi_qa5350/is_/ai_n21301101
 
Thanks Fred. Article on testing PD pumps really helped.

Jay
 

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