photo CHPE_AnimatedWebBanner_650x1202_zps5704d467.gif
Sign in to follow this  
Followers 0
MSUEngineer

NPSHR/NPSHA

6 posts in this topic

Anyone give me a straight forward definition of NPSHA and NPSHR. I sort of understand it. Or maybe I am getting bogged down in details, and should just be able to apply the equations instead of understanding what is going on.

Share this post


Link to post
Share on other sites
Anyone give me a straight forward definition of NPSHA and NPSHR. I sort of understand it. Or maybe I am getting bogged down in details, and should just be able to apply the equations instead of understanding what is going on.

I asked this same question about a year ago. So sad to know I was doing the same thing this time last year.

Anyway, thought this might help.

click here

owillis

Edited by owillis28

Share this post


Link to post
Share on other sites
Anyone give me a straight forward definition of NPSHA and NPSHR. I sort of understand it. Or maybe I am getting bogged down in details, and should just be able to apply the equations instead of understanding what is going on.

The PE Notes wiki has something that should be pretty helpful in the pumps section. To access the wiki, see the thread http://engineerboards.com/index.php?showtopic=4171

Share this post


Link to post
Share on other sites

Thanks. While studying I get bogged down trying to understand what is actually happening. I guess I should just focus on how to apply the equation(s) to a problem, since there are a broad range of questions on the Env exam.

Share this post


Link to post
Share on other sites
Thanks. While studying I get bogged down trying to understand what is actually happening. I guess I should just focus on how to apply the equation(s) to a problem, since there are a broad range of questions on the Env exam.

It's a delicate balance... "plug and chug" only works if you do enough different problems to be able to apply the pattern. In general, you need to know enough about the process to understand how to apply the equation. The key is knowing when too much is too much. Regarding this subject, I don't think it matters much if you know *how* cavitation occurs, but you do need to know *when* cavitation occurs.

Share this post


Link to post
Share on other sites
Anyone give me a straight forward definition of NPSHA and NPSHR. I sort of understand it. Or maybe I am getting bogged down in details, and should just be able to apply the equations instead of understanding what is going on.

I think this concept is fairly important to understand since there are several different aspects from which a question could be formulated. I think the CERM has a reasonably short and adequate explanation with an example problem. I always found it was easiest to draw a schematic when doing these types of problems and "track" the head differences through the schematic. Check out the CERM example.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0