SIF FOR LATERAL TEE

Does anyone have a spreadsheet for calculating the
inplane and outplane SIF of Lateral XS Stl A234 WPB OR A-105....Your help is highly appreciated....Thanks

And also the reference technical document/paper for such calculation....Thanks again...

Regards,

FEA or otherwise Kellogg has simple formulas (fig. 3.14). These formulas are applicable to heavy wall fittings like in your case.
Kellogg's analysis limits the average membrane stress and includes correction for non-uniform stress through the wall thickness.

Hi Borzki,

Equation 10 & 11 (for inplane/out of plane sif)from an ASME publication "Determination of Stress Intensification Factors for Integrally Reinforced 45 degree Lateral Branch Connections"
by D J Walsh and G E Woods should go a long way to help you, unfortunately I dont have the publication number.
A rule of thumb often used in the industry is 2.5 x Code SIF, this is based on research work carried out by the Welding Research Council (Bulletin # 153) on Oblique Nozzle Attachments .

Regards
A

How about:
"Stress Indices, Pressure Design and Stress Intensification Factors for Laterals in Piping", 1988, by E.C. Rodabaugh for Welding Research council, PVRC Grant 88-14.

I do not have the WRC Bulletin number for this one but maybe I can ask Everett for it. This is a pretty comprehensive piece of work, so it would take a good amount of reading before you could gen up a spreadsheet. Like anything else, you have to understand the concept completely before you dare to automate it.

OK, it is WRC Bulletin 360

http://www.forengineers.org/cgi-bin/wrcbulletin/bulletin.pl?action=view;id=371

Regards, John

Thanks a lot for the info..


More power to all,

RS,

The Kellogg approach that you mention is intended for MUCH heavier wall thicknesses than XS (or even XXS) pipe. The Kellogg approach is for "forged block fittings" typically used in older designs for power stations. These fittings were made by forging a solid block of the correct material and then boring the inside diameters through the forgings to create channels for the (typically) steam to flow through. These "forged block fittings" were very heavy and very, very stiff and we model them as we would very thick valve bodies, i.e., completely rigid (relative to the adjacent pipe sections).

Regards, John.

Laterals have been found in testing and analysis to have a lower SIF than 90 degree branch connections. The opening size is larger so the moment divided by the moment of inertia of the section where the branch connects to the run pipe yields a lower line load than for a 90 degree branch. The B31.3 committee has discussed putting in a simple statement that the SIF for 90 degree branches can be conservatively used for laterals.

Remind Dave to take out an AI!

In reply to C.Becht.
How can i properly refer to your statement in my calculation? Has the committee put this on paper antwhere?

Also, are the flexibility factors as per 90deg?