ASME B31.1 - 319.4 Flexibility Analysis

[gA2002]

thread292-246231

I am not sure whether I have determined the correct anchor distance U in my calculations to check the requirement for Flexibility Analysis as per 319.4.

Question: In determining U (straight line distance from anchor to anchor), does it mean the diagonal distance between anchors in a rolling pipe?
What I did is use the simple space phytagorian (c2 = a2+b2+h2) to calculate the distance. Can anyone tell me if my procedure is correct?
Thanks in advance.

 

[DSB123]

What are your X,Y and Z projections?

 

[gA2002]

The projections between two anchors being considered are:
x=2363 mm
y=3226 mm
z=1488 mm

This comes out after algebraically adding all the piping segments on the pipe spool roll being considered, done for each corresponding axis.

I simply assumed that U = SQRT(x^2+y^2+z^2)= 4227 mm

To be use on Flexibility Analysis check through equation (16) in 319.4.1.
Any comment on this?

 

[DSB123]

You are correct but note the limitations of the simple check especially the fact there should be no supports/restraints!!!

 

[gA2002]

Thanks DSB123, appreciated.