zick analysis in a vessel on 3 supports 2

[Luike]

Dear Coleagues:

I'm a begginer in this kind of forum but i need a specific
help.

I'm checking effect due supports in equipment but this one have 3 support. I've calculated loads and moments due to weigth on each support using 3 moments methods (this equipments is almost simmetric, no changes in diameters or thickness).

Just when I try to apply zick analysis for to determine stresses on several parts of equipments i find doubts. I don't know exactly how this method could be applied but i guess I must take more loaded saddle and its neighbour and taking in account moments and loads on respective saddles and forcing the following equation to be equal to zero.

A^3+M*L/Q*A-0.5*R2 = 0

where A = distance between tangent line and support (it should be change to force this result, it is a iteration result of value)
M = moment on saddle
L = distance between saddles used in calculation
R = radius of vessel

with this value of "A" , I proceed to calculate all stresses.

Please, send me your oppinion about it or advise me another method to apply.

Thanks in advance for your best efforts and best regards

Luike

 

[waskillywabbit]

This question has been asked and discussed numerous times. Try the "search" feature at the top of the page using some common terms like "Zick" "saddles" "multiple" and you will find a lot of information.



Brian

 

[LSThill]

Luike (Mechanical)

I agree with waskillywabbit (Mechanical) and I do have the Technical paper:

A Simple Solution to Cylindrical Pressure Vessels on Multiple Supporte


Regards

Leonard Stephen Thill



L S THILL

 

[BarryEng]

Isthill - don't keep it a secret - what is the title of the paper? & where can you access it? I like simple solutions.

I often design above ground pipelines with the same problems. In a boiler (or pressure vessel) the span is usually quite small compared to a pipeline. However, in almost all pipelines, the design value is the sum of the uniaxial stresses, in the circumferential direction, in the vicinity of the saddle tip. I assume that the same condition applies in pressure vessels.

 

[Luike]

Hi, colleagues, you have the reason, after send this e-mail I was finding related info and finally I could catch sample of this calculation in EN13445 but it would be very interesting if is possible to get the referred paper. It is possible lsthill to send a copy of this?

Sorry for disturbs i can cause and best regards

Luike

 

[LSThill]

TEAM MEMBER'S

USE Eng-Tips Form: Advanced Search: "Zick" "saddles" "multiple" and you will find a lot of information.

1) A Simple Solution to Cylindrical Pressure Vessels on Multiple Supporte.

Regards
Leonard Stephen Thill