RE: Piping around Reciprocating Compressor

this sucker is big. for a positive displacement machine like a reciprocating compressor, my worry will be pulasation and vibration more than the nozzle load. the piping designer must be at least conversant or familiar with the mode shape and understand the physics of resonat frequency.

         The piping and control of pulsation and vibration for reciprcrocating compressor is covered under Section 3.7 and 3.9 of API 618. And in most cases, prediction by computer modeling is unrelaible (at least my expereinced). If vibration is noticeable during startup i suggest you take reading of the vibration amplitugde and frequency at different location. Plot the mode shape and perfrom the analysis using the method suggested by KT (i guess it appeared at pipingdesign.com). The objective is to find and minize the forcing function, I prefer this method to stiffening and bracing of the piping.

         The other problem associated with piping is noise. Normally its corrected by insulation and isolation. Done some few of this type of problem if anybody is interested.

> ----------
> From: Macharla, Hari[SMTP:HMacharla@mcdermott.com]
> Reply To: <a href="/group/PipingDesign/post?postID=3xSdEVi9nSRnzH9kA5I8XL22TWHIlKtCLHN0iyasB9c0-70xF71symJl7JYqVr-v7NdZ1W1fSHQhd8SyT0uqiL8Q">PipingDesign@yahoogroups.com</a>
> Sent: 07 October, 2001 7:38 AM
> To: 'PipingDesign@yahoogroups.com'
> Subject: [PipingDesign] Piping around Reciprocating Compressor
>
> Hi all,
> . In such arrangement do you suggest any method of isolating the
> vibrations from Machine to Piping? I
> Regards
> Hari
>
> ___________________________________________________
>
Received on Sun Oct 07 02:32:00 2001