I'm designing a pressure vessel with a relatively large cap that provides access into the vessel, what recommended thread specifications is needed to maximized locking and safety against faliure or popout.

  • $\begingroup$ What have you found on existing high pressure vessels so far, so we don’t duplicate and waste our effort. $\endgroup$ – Solar Mike Mar 1 '19 at 5:12
  • $\begingroup$ Well, I have seen the standards for scuba diving tanks which gets pressurized to up to 4000 psi, but I was looking for help since my case incorporate the "surge", I don't know if that matters. $\endgroup$ – TechDroid Mar 1 '19 at 5:48
  • $\begingroup$ What about deep diving vessels? $\endgroup$ – Solar Mike Mar 1 '19 at 5:48
  • $\begingroup$ This is an Australian standard: "standard 3/4" NPSM (NGS) parallel thread, sealed by an O-ring, which has a 60° thread form, a pitch diameter of 0.9820 to 0.9873 in (24.94 to 25.08 mm), and a pitch of 14 threads per inch (5.5 threads per cm)." $\endgroup$ – TechDroid Mar 1 '19 at 5:51
  • $\begingroup$ Like submarines? $\endgroup$ – TechDroid Mar 1 '19 at 5:53

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