Nozzle Load : Transfer Piping loads for Saddle Calculations 1

[AK8824]

I have in a horizontal vessels a few Big size Nozzles (60" NPS). While calculating the loads on the saddles do I have to consider the loads that I locally applied to the nozzles?

To me it appears not neccessary.

I would appreciate any inputs on the subject.

Thanks.

 

[TGS4]

Yes - how else do you think that these piping loads are going to be resisted/restrained?

 

[JStephen]

I suppose in a lot of tanks, those loads are negligible compared to the saddle loads. But where they're not negligible, they should be included.

 

[jte]

I had a case many years ago where the loading caused by the overhead line on a tall column made me have to go back and increase the size of the anchor bolts. Rare, but it can happen... Those loads gotta go to the ground somehow.

jt

 

[MJCronin]

AK,

To me it DOES appear necessary to incorporate these loads....as stated above, they "gotta go somewhere" !!!

I have seen large piping stress analysis models (CAESAR-II)developed incorporating tanks, vessels and major adjoining piping systems.

The purpose of these large FEA model was to develop loads on the vessel/tank supports from various piping systems that were expected to grow thermally. Sometimes, based on the skill and judgement of the engineer, the vessels were modelled as "rigid" members, sometimes not....

Horizontal vessels on hot systems typically incorporated one saddle support that could slide.

You are in an analysis area where engineering judgement must be applied.

Also see the fine software developed by the Paulin Group specifically for this purpose.

http://www.paulin.com/prg/nozzle_pro.htm

What country is your project located in ?????--

-MJC

 

[AK8824]

Hello friends,

Thanks for sharing your experience. I believe if the load is not very significant that could affect the saddle deisgn, we can ignore this laod. However, if the load is significant, as it is in my case (60 NPS), I must account for it.

MJC - Well this project is in Canada.

Thanks.

AK

 

[juancito]

Sorry to join late this thread.
Definitively, nozzle loads has to be considered in saddle design.
Besides (unless pretightenning is clearly specified), longitudinal shear loads will be taken by anchor bolts of only one saddle.