Thank you for your reply, John.
Regards,
- Ken
From: PipingDesign@yahoogroups.com [mailto:PipingDesign@yahoogroups.com] On
Behalf Of John Luf
Sent: Friday, August 24, 2007 10:08 AM
To: PipingDesign@yahoogroups.com
Subject: Re: [PipingDesign] Under-hung Expansion Loop
Have seen both arrangements.... if the "details" are properly taken care of either works.....
Best Regards,
John C. Luf
Cleveland Ohio U.S.A when I'm not in Austria
Member B31.3, Piping Engineer - Stress Analysis, Pipe Supports, Component Design, and Surge Analysis... according to my daughters master of unimportant trivia
For a 12 inch 250 lb saturated steam main on an 300 ft long arbor, not
enough clearance was provided to locate a pipe expansion loop above the
steam tier elevation. (The piping is installed, and now the project is
wanting a flexibility analysis to consider pipe expansion.) An under-hung
loop will fit because there is clearance below the steam tier. At first I
didn't like an under-hung design because of its potential to trap
condensate. But an over-hung loop will trap condensate will trap condensate
much to the same degree ahead of an over-hung loop. So, it seems that as
long as an adequate drip is provided, and as long as the effect of pipe
growth in the vertical piping is accounted for in terms of maintaining
adequate pipe slope for drainage, both approaches, over-hung or under-hung
are about equally safe and functional in the long run. Any experience to
suggest otherwise?
Ken Nisly-Nagele, P.E.
Mechanical Engineer
Applied Engineering Services, Inc.
Indianapolis, Indiana, USA
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[Non-text portions of this message have been removed] Received on Fri Aug 24 16:41:00 2007
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