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!

*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.

Jobs

Load Sharing between 2 Nos. Centrifugal Compressors of Different Capacity and Discharge Pressure

Load Sharing between 2 Nos. Centrifugal Compressors of Different Capacity and Discharge Pressure

Load Sharing between 2 Nos. Centrifugal Compressors of Different Capacity and Discharge Pressure

(OP)
Hello Everyone,

I am having 2 nos. of centrifugal compressors connected from same suction header at pressure of 10 kg/cm2g

Capacity of one compressor is 5 MMSCMD and have discharge pressure of 27 kg/cm2g and capacity of other compressor is 3.5 MMSCMD and have discharge pressure of 60 kg/cm2g.

Please advise me that, is load sharing possible between these two compressor and if possible then what is required for achieving the same in term of instrumentation.

regards
Sanchit

RE: Load Sharing between 2 Nos. Centrifugal Compressors of Different Capacity and Discharge Pressure

if both compressors are connected to the same discharge header, the maximum discharge pressure in that header is limited to what the lower pressure rated compressor can reach (27kg/cm2). the other compressor with a higher discharge pressure must operate at its normal design pressure (or close to it) or it will be in severe choke/overload condition. therefore, the higher pressure compressor would have to have a pressure reducing valve downstream of it's discharge to reduce the pressure down the header pressure of the lower pressure compressor. that is possible but is not an efficient way to operate that compressor since it would be using power to compressor gas up to the high pressure and then a valve is used to reduce that pressure down to a lower pressure, essentially throwing away the energy used to compress the gas.

if the higher pressure compressor is variable speed, you might be able to reduce the speed enough to lower the discharge pressure down closer to the discharge pressure of the lower pressure unit.

this situation you ask about is more complicated that what can be answered in a forum though. you should engage the compressor experts within the company or the OEM that built the compressors.

RE: Load Sharing between 2 Nos. Centrifugal Compressors of Different Capacity and Discharge Pressure

You used the word "compressor" but I sense English is not your primary language.

These machines are compressing "gasses" that do not condense nor vaporize in the piping, correct? You are NOT trying to pump liquids?

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!


Resources


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