Hi all,

Someone guide me, i have a piping isometric with length of 3m to 6m @8" and 6" pipe. Both end are connected to nozzle and one branch connection connected to tie-in point (Anc). The pipe design condition are, Design temp.170 deg c, design pressure is 10 bar.

My question "Is it necessary to do the stress analysis in Caesar".

The "Design" pressure and temperature have no baring on the analysis.
What is the installed ambient temperature?
and
What is the maximum "Operating" temperature?

Can you show a sketch of the configuration?

Dear jop,

To find the attached image.
Ambient temp =19 deg c
Max Operating temp = 170 deg c

Your question:
"Is it necessary to do the stress analysis in Caesar"."

YES!
You also need to include a lot of information for the Pipe Stress Engineer.
You have four end points on this "Isogen" Isometric.
You said that two end points were connected to nozzles. Nozzles of what?
you also said that one of the end points is connected to a Tie-In point. Tie-in point to what? Another pipe or another piece of equipment?
What about the fourth end point? The TEE, where does that go and what is the configuration there?
Where are the supports? Or are there no supports?

Refer the attached file...

thanks

"Is it necessary to do Stress Analysis using CAESAR II?"

This is wholly dependent on the discretion of the client/end user, or an engineer / stress analyst experienced in these matters. With that said, I agree that yes these temperatures would require an analysis.

You will need to verify that the nozzle connections (that you modeled as anchors) do not exceed the allowable forces for the equipment they are attached to. If the equipment is new, you typically can get the manufacturer to verify your reactions. If they aren't new, well, you'll have to dig for this information.

(Your pipe might pass code checks, but it's a bad design if it rips your nozzles off your vessel.)

As far as the tee is concerned, you will have to do *something* to simulate what it does to your system. Does it expand and contract like your pipe does? If so, you'll at least have to add its deflection to your piping.

Finally, you may wish to consider a flange check on the nozzle depicted on the left.

You wrote:
"I have a piping isometric with length of 3m to 6m @ 8" and 6" pipe. Both end are connected to nozzle and one branch connection connected to tie-in point (Anc)."

1. The 6" pipe is a little over 2.6 meters long (including the wafer check valve and the ball valve) with a very short 488mm leg. This is very stiff.
2. The sketch includes a 3/4" line to something (not defined)
3. There is also a 6"x6"x3" reducing TEE with a branch to something (not defined)
4. You said the two ends of the 6 piping are connected to nozzles and you identify these "nozzles" as "Anchors"
5. You further added that this system is operating at 170 degrees "C"
Comments:
a. (minor point) There is no 8" pipe on the sketch and none in the BOM.
b. (Major point) A "Nozzle" by itself does not constitute an Anchor. The "nozzles may or may not be "Anchors" depending on what they are attached to, where it is attached and where the actual anchor is for each of these two pieces of equipment. If the nozzle is at one end of a piece of equipment and the equipment anchor is at the other end then you have a moving connection (the distance from the equipment anchor times the coefficient of expansion of the 170 degrees)this could double or triple the expansion you need to deal with.
c. Since you furnished a finished "isogen" fabrication isometric (Issue date 31Aug2012)it suggests that you are way late in the final production phase of this project. This being mid October this piping may already be fabricated, this is real late to just now be thinking about whether or not to do Pipe Stress Analysis.

What is the real story and real issue here?

Hi jop,

Thanks for your valuable advice, that is not issue isometric to client..that isometric is only for internal purpose. last two month that project was hold. Now only we started with the same set of isometric.

My problem is,what should be the minimum length criteria for doing pipe stress analysis. Most of the clients, specify only temp and size.

1) (For Example)12 inch pipe at 120 deg c, length shall be 3m ( should we analyze a pipe of this length).

Yes