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Currently working on a 4" diameter copper boiler using the water tube design from Cli Shay book by Robert Maynard. Question is what thread should I use for outlet Bushings to connect PR valve, pressure gage, whistle, steam supply etc. The book indicates 3/8-24 thread for most outlets. One connection on top of boiler indicates 1/8NPT thread.
Is a tapered pipe thread better for sealing or is the straight thread with a suitable sealer better? Last boiler I built about 18 years ago was a steel jacket and firebox with copper flues that were expanded into the tube sheets which worked well for the locomotive it powered. That boiler was strictly NPT type threaded fittings. Application for this copper boiler is to power bench top stationary steam engines. Any wisdom/advise from experienced copper boiler builders appreciated.
Regards.
Bob
Is a tapered pipe thread better for sealing or is the straight thread with a suitable sealer better? Last boiler I built about 18 years ago was a steel jacket and firebox with copper flues that were expanded into the tube sheets which worked well for the locomotive it powered. That boiler was strictly NPT type threaded fittings. Application for this copper boiler is to power bench top stationary steam engines. Any wisdom/advise from experienced copper boiler builders appreciated.
Regards.
Bob