Also, Upstream and downstream lengths depend on the configuration of the
fittings used, i.e. before and after the Flow Element, which varies from
upstream 7D - 25D
and downstream 5D - 15D. These straight lengths can be reduced using 'Flow
Straightners' upstream of the FE.
regards
Sharma
-----Original Message-----
From: V.R.H.P. Macharla [mailto:macharla777@yahoo.com]
Sent: Monday, November 26, 2001 8:51 AM
To: PipingDesign@yahoogroups.com
Subject: Re: [PipingDesign] Flow Elements - Recommendation
Rakesh,
I suppose you are looking for the philosophy behind
deciding the straight lenths before and after flow
element.
It links to theory of Boundary Layer and Secondary
Flows in fluid path. After any bend, there will be
secondary flows induced near the pipe wall...it
proportionately effects local velocity/pressure of the
fluid. Considering the length of pipe required to
reach to full velocity of liquid, standard straight
lengths ahead of Flow Element are established.
For after FE, also staright length is required to
reach to full velocity after the Vena Contracta
condition at FE.
Hope it clarifies upto some extent.
Macharla
--- saud <saud@bushnak.com> wrote:
> Dear Rakesh
>
> The standard recommended dimensions upstream and
> downstream of a flow
> measuring instrument sensor (paddle wheel type etc.)
> is 10 times the
> diameter of the pipe (D) for upstream and 5 D for
> down stream.
>
> With latest magnetic flow meters, this dimension is
> reduced to 5 D and 2 D
> respectively.
>
> Regards
>
> Saud
> ----- Original Message -----
> From: "RAKESH PATIL" <rpa@epc.ltindia.com>
> To: <PipingDesign@yahoogroups.com>
> Sent: Friday, November 23, 2001 6:15 PM
> Subject: [PipingDesign] Flow Elements
>
>
> > ** High Priority **
> >
> > Can anybody give me the basic criteria behind
> deciding the upstream and
> downstream dimensions between Flow Element and
> connecting Fitting /
> accessories in piping?
> >
> > regards,
> > rakesh
> >
> >
> >
> >
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Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Received on Mon Nov 26 00:00:00 2001
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