Dear J. Montero,
I'm not talking to use expansion loop. But It could be.
I mean if the location of pipe from underground leaves the ground is far away from the scapper trap. And then based on Caesar calculation, (If) the displacement coming to the scrapper trap is very little and the occurring stress is not exceeding the allowable stress of equipment why you have to stop the displacement.
Actually, How do you get the force and displacement? Using manual calculation or stress analysis (finite element).
You can try to model the condition using Caesar (e.g. begin with underground pipe and going up using 5D or 3D (45deg) bend and then pipe going to scapper trap) and check the occurring displacement and stress at scrapper trap. In general, the support type of scrapper trap, one is sliding and the other one is anchor.
Long back ago, I made some strange or stupid decision may be. Due to very big force. I discussed with mechanical engineer to change the type of support of scrapper trap and he was agreed. Both support, we changed become guide. The force decreased. And it's working.
Please correct it, If I made a mistake. Sorry.
Best Regards
Arief
JEMontero <montero.je@gmail.com> wrote:
Thank for your comment, but I´ve some questions about it:
Mr. Rajendra Bajikar., which NFPA ? sorry but I was talking about a gas pipeline.
Mr. Arief, I need to stop the displacement near the scraper trap
(when pipe leaves the ground).
Do you talking about to use a expansion loop ?
again thanks.
jemontero
On Thu, 6 Jan 2005 15:52:06 +0700, Arief Agung
wrote:
>
>
> Dear J. Montero,
>
> Last time, I have involved the same like this. The force will be very
> big because we stop the displacement of pipe using anchor due to
> temperature change.
> I calculated the force using two ways. First using manual calculation
> based on Pipe stress analysis book (Sam Kannappan) and second I use
> Caesar to modeling the underground pipe.
> And then, I use the anchor flange (inside of concrete block) to hold the
> force (ASME sec. VIII div1 appendiks 2). Concrete block calculation by
> civil.
> If it is possible, We might be release the pipe to move. I mean if the
> location of equipment to be protected from displacement is far from the
> anchor block. Let the pipe moving so the force will go and no need to
> provide anchor block. We can check the value of displacement at
> equipment using caesar.
> Please correct it, If I'm wrong. Sorry.
>
> Thanks
> Regards
> Arief
>
> -----Original Message-----
> From: rajendra bajikar [mailto:rajendrabajikar@yahoo.com]
> Sent: January 6, 2005 12:33 PM
> To: <a href="/group/PipingDesign/post?postID=UFT-dy916CO7KPQAusSHnL484naLP0cm771No9MQPOte65szy1jV6ECMniDk7wTm8QctA_rOvyqlB0NtOttrpPhT9Tb0">PipingDesign@yahoogroups.com</a>
> Subject: Re: [PipingDesign] Pipeline Anchor
>
> Dear J Montero,
>
> Please refer NFPA - Rules for laying pipes and Appendix A thereto which
> treats your subject fairly well. I hope this will be of use to you.
> Regards,
> Rajendra Bajikar.
> India.
>
> JEMontero wrote:
>
> Hapy New Year 2005 for al!!
>
> Some of you, could indicate where to obtain information to me on
> blocks of anchorage for pipe lines. I am making a flexibility study to
> determine the forces in the anchorages in the points where the pipe
> leaves the ground, and they are to me force very great. It would be
> thankful if somebody says to me where I can obtain information on the
> matter. again thanks.
>
> jemontero
>
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