Well Well ,

Apparently my questions were subject to misinterpretation as to their intent….

I wanted to know about the D/T ratios so as to get a feel for the sq. rt. of r/t distance for the header as well as what pressure range the system was running at. The other question concerning layout has nothing to do as far as any CAD or CAE software limitation is concerned but the fact is that simply because somebody can weld some lumps of metal together does not substantiate the structural integrity of the final product!

The Sch 100 implies high pressures so the first concern is pressure design…. Factually the two branches will have the minimum ligament space of ~ 5.4”. The transmission length or attenuation length of stress is for rule of thumb considered to be twice the sq. rt. of r/t which is ~3.2”. 3.2”x2 = 6.4” so this ill conceived layout may have problems from the pressure retention stand point alone… I point out to you ASME B31.3 para. 304.3.3

SIF wise… well the attenuation length for stress also seems to indicate there ,may be some affect there as well and para 319.3.6 in the next code should say something about if listed components are combined in a manner which they were never intended for the designer is responsible for coming up with I and h… (it took me a long time to get this paragraph revised but I did so when facing another questionable arrangement that some loud mouthed piping layout person said was fine because it could be built in a CAD package)


Change the layout or do some FEA if you want to do a proper job or ignore the situation and hope for the best.