How to calculate NPIPA and NPIPR for positive displacement oil pumps

[jaybikes]

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.

 

[FredGarvin]

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

 

[jaybikes]

Thanks Fred. Article on testing PD pumps really helped.

Jay