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