Re: Re: installation of control valve & instrument

From: <bruce.r.raymond@fluor.com>
Date: Sun Aug 12 2007 - 06:32:00 EDT

Amit - I got confused by your reply - please refer to API RP 550 - "Straight Run Requirements for Meter Runs" upstream distances are determined by: 1) d/D ratio ( normally 0.7) & 2) piping upstream configuration, therefore at a "beta (d/D) ratio of 0.7 your minimum upstream straight runs can range from 14 to 39 diameters , downstream remains constant at 5 diameters. Don't forget that ALL interior welds at orifice flanges must be ground smooth. For other types of flow sensing devices (annubar, positive displacement, venturi, magnetic, coriolis, etc.) individual piping requirements exist & must me verified

Bruce R.Raymond
Senior Design Supervisor
Fluor Daniel South America

"Amit Vedak" <amitvedak2000@yahoo.com>
Sent by: PipingDesign@yahoogroups.com
08/12/2007 02:05 AM
Please respond to PipingDesign

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[PipingDesign] Re: installation of control valve & instument

straight length thumb rule for flow instruments is 10D upstream & 5D downstream, I always follow 14D upstream and 3.5 downstream, process final dimensions generally in between this. this is safer. control valve don't need straight length, after control station give spool for flow element.

Amit Vedak
Piping Designer, UAE

• In PipingDesign@yahoogroups.com, "chm_mech" <chm_mech@...> wrote:
  >
  > Hi,
  > I would like to know what is the thumb rule to decide min
  > straight length of the pipe for installing a control valve &
  instrument
  >
  > Thanks for enough in advance
  >
  

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[Non-text portions of this message have been removed] Received on Sun Aug 12 06:32:00 2007