Dear All,
I need a help from all,
m working on the Flare Piping Stress analysis and having a doubt,\In actual the two flare line is connected with flare and in which one line existing bellow is replaced by expansion loops and we did stres analysis for these expansion loop , but the load at the flare flange is coming more than the allowable,
please suggest me the solution to reduce the loads,
I tried giving the limit stopper also and since all existing supports consider as simple rest,

thanks

Here we go again.
Not enough information and that which we are given is confusing.

1 - What is the line size of the Flare Header in question (the one with the proposed new loop)?
2 - What is the material of the existing Flare Header?
3 - What is the wall thickness?
4 - What is the worst case operating temperature (during a Hot release)?
5 - What is the total length from the last existing anchor to the Flare Stack?
6 - How many pipe supports are there between the existing anchor and the Flare Stack?
7 - How high are the pipe supports?
8 - What are the dimensions of the proposed loop?
9 - Where is the proposed loop to be located relative to the Anchor and the Flare Stack?
10 - Will the Loop be a flat single plane configuration?

Dear Sir,
Here we go again.
Not enough information and that which we are given is confusing.

1 - What is the line size of the Flare Header in question (the one with the proposed new loop)? - 36"
2 - What is the material of the existing Flare Header?- API 5L Gr.B
3 - What is the wall thickness? - 9.42 mm sch std
4 - What is the worst case operating temperature (during a Hot release)? - 100deg cel.
5 - What is the total length from the last existing anchor to the Flare Stack? around 300 mts
6 - How many pipe supports are there between the existing anchor and the Flare Stack? all simple rest supports
7 - How high are the pipe supports? approx 3mts
8 - What are the dimensions of the proposed loop? 12mtrd
9 - Where is the proposed loop to be located relative to the Anchor and the Flare Stack?---
10 - Will the Loop be a flat single plane configuration?--ya....
wanna attacehd drawing,,can u tell me how can i attached dwg.
\

6 - How many pipe supports are there between the existing anchor and the Flare Stack?

The question here is how many? This means are there 5 or 7 or 10 or 15? I would like for you to count them and tell us the number.

8 - What are the dimensions of the proposed loop? 12mtrd
I do not understand this. A loop has a length and a width, What are you planning?

9 - Where is the proposed loop to be located relative to the Anchor and the Flare Stack?---
You did not answer this one.

MGR,

So there is an existing bellow element in one of the lines that is being replaced by expansion loops. Can you provide any information on it such as diameter, design deflections ( axial compression, lateral movement, axial stiffness)along with any tie rods or piping restraints? There must be some tie rods if all the piping supports are sinmple rest supports.

Just as the bellow element would have tie rods to restrain its pressure thrust, any expansion loop would need restraints (limit stops, anchors, or guides) to control piping movement into the loops and away from the flare.

What are the flare allowable loads that piping loads need to comply with?

Did the bellow element take up all displacement of the 300 mts pipe length? It will be important to know material, as stainless steel will be expanding 50+% more than a carbon steel ( 275 mm versus 450 mm at 100 C.)

hello
find attaceh caesar file ,, kindly chk n resolve loads

It looks to me like you have more problems than just an overloaded flange. You might want to look at the entire stress report and not just the restraint report.

R u sure all the supports are simple rests? Very strange! Hope u r not missing something...

PS: Beware! Experts here will never give u a design solution. Submitting a CAESAR II file, do not expect someone here will solve it for u!!

MGR
You have overstress situation in your stress job. And some of your support are useless .
Take a look to restraint report in CII .you will find some of the restraints take no load.(lift off).
You should use a proper span for your supports.
The OD of pipe is so high , for this OD you should use some things to reduce friction factor like shoe ,pad, PTFE , etc.
Change your loop legs and their position.
Modify span of supports.
Reduce friction factor.
Try to model the equipment or use displacement at anchor points.
Increase flexibility near the equipments.
At least If you can change main route try use 90 elbow instead of 45
And this job is so professional you must consult with Sr.sress engineer in your work place.
Regards.
Mahdee

I see so many supports........
It make me dizzy.....
How is it resting and where? pipe rack? What doest it look like? I see you got many exp. loop. for what? You got no fixed point or anchor.....?
One thing try to look at the loop, what will happen after installation?? Will it twist like Stick-O or will it open like Oreo? hmmmm make me hungry..

As our senior here say's... Caesar is not a remote control.