Hi Ms/MR,
When i calculate a pipe system connected with tank,i used the nozzle flexibility-api650 check,but to my surprise,the output of the displacement for nozzle check has two question:
1,The radial growth displacement of the shell is only considered the thermal dispalcement,it doesn't consider the displament for tank deformation itslef.
In API650-P presents W=[(9.8*10-6*GHR2)/(Et)]*[1-e-βLcos(βL)-L/H]+αR△T
2,the unrestrained shell rotation resulting from product head is zero,it is impossiable,in API650-P it presents θ=[(9.8*10-6*GHR2)/(Et)]*{1/H-βe-βl[ cos(βL)+sin(βL)]}.
Then i calculated these two parameter by means of API-650 by hand.The outcome is different.
Now i am confused with this nozzle check tools,why is it fail to check nozzle flexiblity? Are there anyone encounter same problem with me?
I look forward anyone's reply,tks a lot.
Best wishes.