Re: [PipingDesign] Bowslinger effect

This is manufacturing jargon that I have never heard of .... ask the person who used it what the **ll he was talking about!

Happy Labor Day Weekend,

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

http://suntzuquote.blogspot.com/

• Original Message ---- From: "James, Barbara" <barbara.james@jacobs.com> To: PipingDesign@yahoogroups.com Sent: Friday, August 29, 2008 8:21:11 AM Subject: RE: [PipingDesign] Bowslinger effect

Hi Kannan,

Thanks for your reply, I think this is probably along the right lines. Unfortunately, my colleague has gone home and won't be back in until Monday

Is there anything in the code to calculate the effects? Sorry, I don't use ASME B31.3 very much and there are people on this list with a lot more experience than I have with this code.

Barbara

____________ _________ _________ __
From: PipingDesign@ yahoogroups. com [mailto:PipingDesign@ yahoogroups. com] On Behalf Of kannan.sundaram@ linde-le. com Sent: 29 August 2008 12:40
To: PipingDesign@ yahoogroups. com
Subject: Re: [PipingDesign] Bowslinger effect

Could be that the EFW pipes are made out of plates which needs to be curved as in a bow and slinger which may have some expansion on exterior and crushing at the interior, at the tangent line which affects the thickess in the region, in turn may not be accounted for in thier scantling. Similar to the fittings like elbows, tees made of mandrel / cold forming process where such ductility effects are taken into account by the manufacturer to achieve the needed min. thk..

Though I have not heard such terminology in pipes, but definitely in fittings and should be the same in pipes made of plates, especially in sizes larger than 42".

Kannan,
Linde, Germany.

"James, Barbara" <barbara.james@ jacobs.com<mailto:barbara. james%40jacobs. com>>
Sent by: PipingDesign@ yahoogroups. com<mailto:PipingDesig n%40yahoogroups. com> 29/08/2008 13:07
Please respond to
PipingDesign@ yahoogroups. com<mailto:PipingDesig n%40yahoogroups. com>

To
<PipingDesign@ yahoogroups. com<mailto:PipingDesig n%40yahoogroups. com>> cc

Subject
[PipingDesign] Bowslinger effect

Greetings All!

Sorry to have been lurking recently, I have changed jobs again, still stressing pipes but back into the wonderful world of nuclear power stations and seismic assessment and BS806. Can't stay away from it!

My query to the group concerns a petrochem, ASME B31.3 system.

One of my colleagues has been to visit a piping manufacture regarding some 762mm OD x 76.2mm wall piping. The material is EFW ASTM A672 C70 containing natural gas at 300 barg.

The manufacturer commented that the size was close to the limit of their manufacturing capacity and that the scantling calc did not take into the account the bowslinger effect.

Does anyone have any idea what this means?

I tried a google search, but nothing useful came up, lots of links to elves, archers and sites selling Bollinger - 200 quid for 6 bottles of non-vintage at Tesco - seems a lot to me...

Barbara

I haven't forgotten that Chris asked me ages ago what was done about seismic assessment on UK nuclear stations, I was busy on main steam systems on coal fired stations at the time and didn't get back to him. Now, I can't remember the specifics of the question, but if he wants to repeat the query I will be able to respond.

____________ _________ _________ __
NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer.

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

____________ _________ _________ __
NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer.

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]
Received on Fri Aug 29 09:55:00 2008