I never came across stub-ins and stub-ons until I moved from Pharmaceutical into the Alumina game (from small pipes to big ones). Stub-ons v tee's. You need to analyse the cost of the tee and labour to install, v the cost of fabrication and welding of the stub-on. I think (but you will need to verify yourself) that for the bigger diameter pipes you will start making allot more cost savings.
Note that stub-ins are not standard B16.9 fitting and will hence require checking for re-inforcement. Also the Stress Intensification factors are far higher for stub-ins/ons. Keep this in mind if the piping system may be highly stressed.
Conor Walshe
Mechanical Design Engineer
Alcan Engineering Australia Pty Limited
A member of the Alcan Group of companies
Tel: (07) 3218 3648
Fax: (07) 3236 0155
e-mail: conor.walshe@alcan.com
"A.R.Mani" <firreza@yahoo.com>
04/05/2004 06:35 PM
Please respond to PipingDesign
To: PipingDesign@yahoogroups.com
cc:
Subject: [PipingDesign] Banching from pipes
Hi Everybody
I was wondering of a statement once I read in a Contract ,said that all
branch connections shall be made by fittings for all sizes and services.
I would like to know about your experiences and good practice regarding
this issue.
Is there any refrences or some general guidlines or some sample PMS's
available to refer to, regarding this issue ?
By a comparison between direct pipe to pipe connection and making use of
fittings or self reinforced fittings for taking branch ,it goes without
saying that the quality and easiness of the job would be much better in
the latter case but regarding cost the former would be cheaper.
Do you have any idea in this issue?
Cheers
A.R.Mani
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Received on Tue May 04 18:54:00 2004
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