4 replies to this topic

[deerun75]

Hi everyone,

I am trying to learn how to design compressor recycles. Is there a standard for that (API, ASME)? How do I determine what part of the suction to connect the recycle line? Any and all assistance will be appreciated. Thanks.

[ankur2061]

deerun75,

You need to first specify the purpose of the recycle line. Is it for anti-surge for centrifugal compressor or is it a capacity control recycle line in a reciprocating compressor.

Unless you clearly specify what is the role of this recycle line in the compression process everybody would just be guessing.

Regards,
Ankur.

[Art Montemayor]

Deerrun:

I will repeat what I advised on the Eng-Tips Forum --

You either:

1) Don't know anything about what you believe you need; or,
2) Don't know how to communicate what it is that you are trying to state.

You can't "recycle" blowdown gas to the suction side of the same compressor that you are trying (or forced) to blowdown. That is purely ridiculous.

By not furnishing any specific basic data and background information on what you are trying to do, you are hiding the true basic answers. How can any member determine if calculations are required? You haven't given any basic information to piece together what it is that you are trying to do!

This assignment belongs in the hands of someone who knows at least a little bit of what is needed or what is being asked as a solution. Otherwise, I highly recommend you get started on some reciprocating compressor tutorials as soon as you can. You could hurt other people - besides yourself - by trying to do something you know little about.

[deerun75]

Art, I really don't have the time to waste with you. If you do not have a constructive contribution, then move on to the next question.
Compressor recycles are used to recycle blow down gas to the suction side. The are also used if the compressor is oversized to maintain suction pressure. Also, like the intelligent anku2061 said, they are used to control compressor surges.
Art, leave the questions to natural gas specialists.

[S.AHMAD]

Dear Deer
1. Mr. Art is trying to improve your weakness you should appreciate when a senior professional engineer taking an effort to make you a better person. This indicates that he cares for the young engineers. You should be thankful to him for spending his precious time commenting on your weakness.
2. Frankly speaking I have learned a lot from my own mistakes/weakness. I strongly believe that a wise person is a person who dares to admit his own mistakes, learned from them and continuously improving.