Friends,
Can somebody help me out in Knowing whether we can use a reinforcement pad on Tee.
I am having a 40 inch line for analysis,i did the analysis but the forces over the support is too high approx. 100 KN.Vertical & horizontal upto 50KN.
As supporting i am doing first time,can some expert advice me whether we can use reinforcement PAD over tee?
If yes,then will it be a problem in constuction on site,as we put truunion on elbow we procure a same elbow and make profile of parent pipe apply it as reinforcement,can we use the same in case of tee.
Please help me in knowing the information.

Regards.

Dear Pipeswami,

See the Appendix H- Sample Calculation for Branch Reinforcement of ASME B 31.3 code if using that code. We can take the reference also Sam Kannappan book Chapter-II Design Pressure Component & Sample Calculation for Branch Reinforcement at the end of the book.

BTW, in ASME B 31.3 for para 328.5.4 Welded branch connection FIG 328.5.4D for (2) Stub-in without pad and (4) Stub-in with pad, how do we generated SIF for them? I think only stub-on provided in Appendix D of ASME B 31.3. Any one have literature hand calculation related?

I think Samsul has missed the point. The question regards structural reinforcement of a support point at a tee, not specifically for pressure purposes.

I assume that your 40" line is horizontal with a vertical branch from the tee. Simply adding a pad to the back of a large tee for support reinforcement is probably a bad idea, since the body is likely to be somewhat barrel shaped, and would require a complex rolled plate. You might consider a support on both sides of your tee attached to straight pipe, or a plate construction, vessel saddle type of support at the tee itself.

Ahhh...Thanks dear MoverZ...:)

Samsul,

I forgot your comment about stub-in / stub-on sifs .....

I think the weld detail is assumed to make no difference to the sif. If a fatigue failure occurs in such a connection it will usually initiate at the toe of the weld, which would be the pretty much the same in both cases.

The B31.3 App. D sif can only be very approximate since it takes no account of the branch diameter or thickness.

Dear MoverZ,

It makes sense I think since not different significantly. They are only different at the branch. For stub-in it enters until ID of the header. Thanks again.

Dear Swami,


Further to the reply from mr Moverz ans mr Samsul, please check the 100Kn vertical force on the bottom of TEE can be reduced by adding additional support( if it is sustain load) or by adding proper flexblity(if it is thermal forces).

And also , since the load is 10tons on the bottom of TEE, better do the support design in FEM or other equivalent software.
Experts can suggest for the same.

regards

Sha..