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Threadolet Formula for ASME B31.3 coil design

Threadolet Formula for ASME B31.3 coil design

Threadolet Formula for ASME B31.3 coil design

(OP)

Please see the following information below that was forwarded to my by a co-worker. Any suggestions would be greatly appreciated.

Thanks in Advance
-----------------------------------------------------------
Given the following information

Design to ASME B31.3, 2004 Edition

 

After running the calculations with an increased CA of 1/8” the revised lower pressure ratings would be:

Pre-heat coil is 3” 2500# with a 5031 psi design pressure (was 5625 psi with 1/16 CA)

            Re-heat coil is 3” 900# with a 1622 psi design pressure (was 2025 psi with 1/16 CA)

            Design Temperature is -7 to 200F, MDMT -7F
            Sour, 1/8” CA, Stress relieved and 100% radiography.

 

Each coil will have a 1/2" and 3/4" 6000# TOL; what is the correct formula to prove the threadolets will meet the design. The thread pitch h as per (B1.20.1) is:

 

1/2" 6000# TOL with 1/2 – 14 NPT h = 0.05714”
3/4" 6000# TOL with 3/4 – 14 NPT h = 0.05714”

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