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Please ignore my request for the opinions. I had found similar discussions on the forum. Sorry about the noise. Best Regards

Request Opinions on the Design Code for the following Lines connected to the X-Mas tree of a Gas Well Head: 1) Wing Valve to choke Valve. 2) Choke Valve to Pad Limit Valve. 3) Pad Limit valve to U/G. 4) Well Head Kill Line. Thanks in advance for sharing your thoughts.

Jeffbru: Sorry for a very late reply. I got busy in a very tight scheduled project which is not over yet. I can understand your feelings as I have been through it... An override of my system inputs for your indicated values: R/t=1173 a/R=0.008 L/2a=1 gives me the following values...

I faced the same problem. Some of the values (stiffness coefficients) given in the example are wrong. You can check yourself by careful manual plotting. There are not just two L/2a but also only three a/R. I have done curve fitting for intermediate a/Rs. I used linear interpolations with...

I used Linear. I spent more than two months in using different approaches later had to do the curve fitting for curves between the ones given in the figures. Best of luck.

Jeff, You are right. I have already done it for my software.

Jeff, The CURVES are in the Appendix-P of API-650. UbaidUllah

Friends, I am a piping engineer and am working on a software for evaluating Nozzles connected to API-650 based tanks. Anybody worked on developing the equations for various curves? It will be useful if some body could share. BR,