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#74057 - 11/01/19 02:50 AM SIF assumption for special geometry .
SANTHOSH1506 Offline

Registered: 03/17/18
Posts: 8
Loc: India

In one of the piping system I have a special geometry ( A barred tee) which is considered as a stiffer geometry in comparison to a normal welded tee. In such case what would be the appropriate SIF value that could be assumed so that my calculations are more realistic. At present the project is in preliminary stage where I am not in a position to get a value from the barred tee supplier.

#74058 - 11/01/19 07:11 AM Re: SIF assumption for special geometry . [Re: SANTHOSH1506]
Michael_Fletcher Offline

Registered: 01/29/10
Posts: 816
Loc: Louisiana, US
As there is no standard barred tee design, there is no standard way to calculate the "real" SIF or stiffness.

I could suggest:

1. Have CAESAR calculate the welding tee SIF.
2. Uncheck and recheck the SIF, and input the SIFs manually.

This should eliminate the flexibility at the joint (i.e. make it stiff).

If the stresses in a barred tee with X force applied are to be less than a standard welding tee with X force applied, then applying the welding tee SIFs should be conservative.

#74067 - 11/02/19 04:00 AM Re: SIF assumption for special geometry . [Re: SANTHOSH1506]
Dorin Daniel Popescu Offline

Registered: 06/05/00
Posts: 124
Loc: Middle East
Just another opinion: Use EXTRUDED TEE B31.3 SIFs, which are higher than B16.9 Welding Tee's SIFs and it's likely to be on the conservative side of SIF assessment. I agree that NO FLEXIBILITIES are to be employed.

Dorin Daniel Popescu

Lead Piping Stress Engineer


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