×
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

Recip Compr Piping Vibration

Recip Compr Piping Vibration

Recip Compr Piping Vibration

(OP)
In regard to acoustical analysis, API 618 App M.2 says "The piping system must be modeled to a point where piping changes will have insignificant effects on the parts of the system under study (usually a large vessel upstream and downstream of the units to be studied)."

My questions are:
1. How can I determine the length of pipe to be included?  Is it based on the pressure fluctuations?  Can it be determined before the analysis is done?  Is it a function of the gas composition?  Can it be determined from the compressor capacity, speed, and the pipe size?  What is a "large" vessel?  Is it relative to the volume contained in the piping or compressor?  TIA

RE: Recip Compr Piping Vibration

It is really a bit subjective, but what you are looking for is either an acoustic volume that is large enough to be essentially infinte, or a pipe run that is long enough that it can be modeled as essientially infinite.

In a chemical plant or a refinery that usually means modeling upstream and downstrem to the first large vessel, usually a column or a tower or a reactor. Something on the the order of 10+ feet in diameter and 50+ feet tall. In my days of modeling natural gas compressor stations I would model upstream and dowstream to the main line and then terminate the main line with an infinite end, basically modeling it as an infinitely long pipe run.

-The future's so bright I gotta wear shades!

RE: Recip Compr Piping Vibration

Let the guy doing the study decide where to terminate the model.  If you are doing a model, model more pipe than you think you need to, then reduce the scope by cutting out the piping with negiligible pulsation (i.e., long runs/after big volumes like sms said).

Don't pay too little for a pulsation study.

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