Effect of second pump in the line on NPSHr

[Pipeline1972]

Hello,
I have a water system with a huge NPSHr, compared to the NPSHa. I can't do much about the NPSHa, so i need to somehow reduce my NPSHr. I'm wondering what the effect would be on the NPSHr of adding a second pump in the line, in serie with the first one, somewhere halfway the end.
Any thoughts?

Thanks,
M.

Process - Piping
ing - EiT

 

[BigInch]

Attaboy!

Bet you wouldn't have done that if you wern't trying to use a program first.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[Artisi]

Very difficult to make that mistake with my simplified method of pencil and paper .

 

[hydtools]

GIGO

Ted

 

[Pipeline1972]

yeeaah, but now i have my 600 m long system running nice and smoothly, and i have a nice representation of the system as well. And a full report. And now i can move on and start tweaking the system.

Process - Piping
ing - EiT

 

[BigInch]

Try not to lower the NPSHa this time, OK?

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/