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#42251 - 04/07/11 12:08 AM Anchor loads near expansion joints
Piper Offline
Member

Registered: 11/10/05
Posts: 39
Loc: SA
Hi everybody

I have to check loads of an anchor just between two expansion joints near flare nozzles and a 270° c. 8 in. line . I mean the arrangement is flare stack + expansion joint + anchor point+8 in pipe respectively. Loads are to be checked to make sure that steel structure can tolerate them.Please also see attached file.
As I know the loads are the sum of friction loads, pressure thrust loads and expansion joint’s spring force. How precise could the loads be if I just modeled the piping system till the anchor point? Are there any important points that I should consider analyzing the job?

Thanks in davance


Attachments
pipe route01.jpg



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#42255 - 04/07/11 01:30 AM Re: Anchor loads near expansion joints [Re: Piper]
danb Offline
Member

Registered: 04/22/05
Posts: 1453
Loc: ...
If you stop your calculation as you intend, you will miss the "pressure thrust loads and expansion joint’s spring force". So you can extend your calculation up to the next anchor, or you will manually calculate and add these forces.

But expansion joints on flare line? Not such a good idea.


Regards,
_________________________
Dan

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#42311 - 04/08/11 11:36 PM Re: Anchor loads near expansion joints [Re: danb]
Piper Offline
Member

Registered: 11/10/05
Posts: 39
Loc: SA

Using expansion joint is the vendor's idea and also in its scope of design.
Regarding the loads other than friction, thrust and spring force what could happen to loads like sustained and seismic loads?

Thanks

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#42314 - 04/09/11 12:13 AM Re: Anchor loads near expansion joints [Re: Piper]
danb Offline
Member

Registered: 04/22/05
Posts: 1453
Loc: ...
Yes, you should combine the mentioned loads from vendor side with the loads from your side.

Regards,
_________________________
Dan

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#42326 - 04/11/11 01:12 AM Re: Anchor loads near expansion joints [Re: danb]
Piper Offline
Member

Registered: 11/10/05
Posts: 39
Loc: SA

Which forces / moments could be large in size if you had to judge?Note that a vertical run exists after expansion joints to top of the flare stack.

Thanks

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#42490 - 04/19/11 02:22 AM Re: Anchor loads near expansion joints [Re: Piper]
danb Offline
Member

Registered: 04/22/05
Posts: 1453
Loc: ...
Ask vendor to give you the loads from his side and combine them with yours.
Let him to take responsibility for his part.
Regards
_________________________
Dan

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