×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Pump Calcs

Pump Calcs

Pump Calcs

(OP)
Can someone please help me make sure I have looked at everything needed to specify the correct pump.  I have a pump system pumping from a pressurized vessel to a pressurized vessel.  So I calculated the NPSHa, the frictional pressure drop, the elevation difference, and came up with what the discharge pressure of the pump should be.  Am I missing any components?

Thanks

RE: Pump Calcs

You'll have to present a complete picture of the system requirements; for example, you'd need to supply physico-chemical data on the fluid pumped, such as viscosity, density, corrosiveness, chemical stability, lubricity, volatility, toxicity, flammability, amount, size and hardness of suspended particles, possible absorbed gases disengaging within the pump.

State the rpm of your motors, also whether the operation will be continuous or intermittent. You'd have to specify adequate margins to overcome transients, but don't oversize flow rates beyond, say, 20% of design. Consider whether future requirements (already foreseen) could be satisfied with the pump to be selected.
 
For total satisfaction, you'll have to have a full sketch of the circuit, including controls, flow rates, pressures, temperatures, piping sizes, valves and any safety items, spares, etc. It will be of value if at this time you start considering transients and what ifs.


On bid evaluation there will be a plethora of new items to consider and compare
before you reach a decision to purchase.

RE: Pump Calcs

Have you considered the pressure difference between the two vessels? If pressure of suction vessel is morethan that of discharge vessel, deduct the deference from total head otherwise add it.

25362(I think I should wish you after 19 days) has given valuable suggestions.

Best of Luck.

RE: Pump Calcs

Taking all the above into account - what material are you using for pipework? how many bends ? Valves etc....have you calculated Friction?

RE: Pump Calcs

now you have to look at the piping system network connected to your pump. For example, avoid air pockets in your suction piping, consider minimum flow piping and controls for your pump, try to define your range of fluid composions because this will define your minimum and maximum pressure drop across the pump.

Consider mechanical aspects as well as process aspects

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

eBook - 10 Reasons to Choose CATIA on the Cloud
To compete in today’s fast-paced and competitive market, smaller and newer firms need a powerful platform that will enable them to compete with bigger players, without the heavy investments needed in computer hardware, software and personnel. Download Now
White Paper - Smart Manufacturing for Electronics
This white paper describes a transformative approach to electronics manufacturing made possible by the addition of Mentor Graphics to the Siemens family. It describes a completely digitalized strategy that supports both printed circuit board (PCB) and mechanical design and manufacturing, uniting the entire product lifecycle – from idea and production to customers and back. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close