Sajit,
That one looks like a typical detail of an anchor to me. I personally do not like it. There seems to be about three meters of pipe between the anchor and the pump nozzle. That piece of pipe will grow about 2mm in heating from an ambient temperature of about 20C to 82C. Where is that expansion going to go?. It is jammed in between the pump and the anchor. So the anchor and the pump will deform to accommodate it. I would have installed zero gap guides to prevent the pipe from moving sideways and allowed the pipe to slide longitudinally through that support and not installed an anchor. You say there is an anchor on both sides of this pump. It looks as though it is getting a 4mm squeeze, 2mm from each side. I am not sure how the pump is mounted, but if it is a centre-line mounted pump I would have also supported the pipe on lugs attached to its centre-line. That arrangement makes sure that the vertical expansion of the pipe and pump match each other.
Anyway that is all a dream, the thing is in place and there seems to be little you can do about it. 2mm is not a lot of movement and some people are happy to just accept the fact that things will just bend to accommodate it. I would not.
Concerning the alignment of the flanges, that is another issue. I am not a wiz bang on construction but I would have expected that the pump flanges are tacked into place with the pipe and pump fully installed. It is common to use slip on flanges, to slip them into place, bolt them onto the pump and then tackweld the flange into its final position. The spool is then removed and the welds completed. With that procedure the matching flange fits the pump perfectly. If the pipe spool was fully prefabricated without fitting to the pump I would expect it not to fit irrespective of the supports. I was on a site once where they aligned the pump and motor shafts with the flange bolts removed, then installed the flange bolts and then checked the alignment of the pump and motor shafts. If the alignment had moved, the connection flanges were rejected. They were cut off and rewelded on again. And that had nothing to do with the supports.
Gordon Reddek
Specialist Mechanical Engineer
Alcan Engineering, Level 3, 443 Queen St, Brisbane, Qld 4001, Australia.
Tel: +61 7 3328 6424
Fax: +61 7 3328 6990
Email: gordon.reddek@alcan.com
Sajit Viswan <sviswan@tebodin.co.om>
05/06/2004 11:01 PM
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Subject
[PipingDesign] Anchor near pump nozzles
Dear Group,
I would like your advice on the subject item.
An existing electric driven centrifugal pump installed at a crude pipeline booster station has a pipe anchor on both the suction and discharge lines. This intent is to eliminate any moments and force transfer to the pump nozzle. Pls see the attached photograph. The pump operates at ambient condition (Design ambient temperature is 82 deg C). Please see the photograph after upload.
Will this arrangement pose a problem during the piping alignment with the pump nozzle. I feel, any fabrication tolerance of this anchor that will not allow the pipe flange to match exactly with the aligned pump nozzles will reflect as a load on the pump.
Sajit
I've uploaded the photo to:
http://www.pipingdesign.com/photos/pump_nozzle_anchor.jpg
(The PipingDesign list does not permit attachments)
Paul
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Received on Sun Jun 06 22:45:00 2004
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