Hi
i refer pipe stress analysis seminar-COADE pdf. how i calculate U= straight line distance between anchors based on pg-no.2.29/102.

Hope you are refering to the simplified methods of flexibility analysis. "U" normally refers to the straight line distance between two fixed points. If the pipe has a route passing through points A,B,C,D and E and say A and E has anchors. We know the co ordinates of these two points and hence the straight distance between these points can be calculated.

Thanks, Mathew. This is correct.

In CAESAR II you could also use menu Edit -> Distance, then use "Nodes" option and specify both anchors node numbers. The distance will be given along with the X/Y/Z components. Distance is SRSS of 3 dimensions.

Referring to the example in the CAESAR II Seminar Notes (where the original question came): U = sqrt((11+12)^2 + (50)^2 + (45+33)^2) = 95.46.

Thanks nadia strikovski.....now i am undershoot.
In that example, the actual maximum expansion stress found in this system through an CAESAR stress Analysis -9051psi (within 1%).as per calculation we get 8903psi.

what is difference in Caser and manual calculation?
what is the meaning of within 1%?
if expansion stress above 0.03 what shall i do?

Read the Code. (B31.3 para. 319.4.1 & 4.2)

If you meet the requirements of that simple equation (Dy/(L-U)^2 is less than K1), then formal analysis for flexibility is not required. If Dy/(L-U)^2 is greater than K1 (or greater than 0.03 in the old Code), your pipng system requires a formal analysis.

CAESAR II is a method of formal analysis.

What is the origin of your calculated value of 8903psi?