RE: Slope in Steam lines

From: <Ben>
Date: Tue Jan 09 2007 - 16:34:00 EST

I think the question was about any pipe requiring complete drainage.

Per document EM 1110-1-4008, 5 May 99, pp.3-27 (internet pdf): "The elevation of the down-slope pipe support should be lower than the elevation of the lowest point of the sag in the pipe. This is determined by calculating the amount of sag and geometrically determining the difference in height required.

    h = (L / n)^2 y / (0.25 (L / n)^2 - y^2)

where:

   h = difference in elevation of span ends, mm, (in)
   L = span, m (ft)
   n = conversion factor, 10^-3 m / mm (1 ft / 12 in)
   y = deflection, mm (in)  "

Ben

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From: <a href="/group/PipingDesign/post?postID=zDsFRX0PGkHifJ-4oTYDhFyX5UGx2nUoGDyecp9EFpb4DFUybmlfIzqY6MGl5paCfYNcAvO1C0L3EN3ukNpHsV-7">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=zDsFRX0PGkHifJ-4oTYDhFyX5UGx2nUoGDyecp9EFpb4DFUybmlfIzqY6MGl5paCfYNcAvO1C0L3EN3ukNpHsV-7">PipingDesign@yahoogroups.com</a>] On Behalf Of Alok Dubey
Sent: Tuesday, January 09, 2007 5:07 AM
To: <a href="/group/PipingDesign/post?postID=zDsFRX0PGkHifJ-4oTYDhFyX5UGx2nUoGDyecp9EFpb4DFUybmlfIzqY6MGl5paCfYNcAvO1C0L3EN3ukNpHsV-7">PipingDesign@yahoogroups.com</a> Subject: Re: [PipingDesign] Slope in Steam lines

Hi,
Well it is not common to see Sloping steam line. May be it would have been done in order to catch condensate. You can do away with slope if this is the reason by intoducing drip legs and steam traps at low points. The drip legs location should be at lowest point in that pocket and nos depend upon the capacity required to remove the valuable condesate which in turn depends upon primirarily on pressue (i.e L.P, M.P., H.P. and HHP).

Sloping lines have thier own problem so try not to see them on p&id`s untill and unless really warranted.

As to ur last qs I feel it is process designer responsibility to indicate any such reqt.

best regards

• Original Message ---- From: Mehdi Orojlu <mehdi_orojlu@ <mailto:mehdi_orojlu%40yahoo.com> yahoo.com> To: PipingDesign@ <mailto:PipingDesign%40yahoogroups.com> yahoogroups.com Sent: Friday, December 22, 2006 7:45:41 PM Subject: [PipingDesign] Slope in Steam lines

Hi all,
The Slope in steam lines is different (exp 0.5%, 1%, 2% <---- as I see in some projects).
But Generally who should decide about the amount of slope (piping or process designer) and how the suffiecient slope is calculated? does any criteria exist to select the piping slope or related to experience?

Regards,

Mehdi Orojlu

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Received on Tue Jan 09 16:34:00 2007