Where can I find the minimum and maximum installation torque for NPT threaded pipe? Is there a pipe-fitters manual somewhere? I need this for the design of the threaded body/adapter joint on our threaded-end ball valves.
Some valve specifications, such as ANSI/FCI 70-2, specify an allowable leakage rate through a valve as a percentage of rated valve capacity. The definition of "rated valve capacity" is vague. The leakage rate is measured with the valve closed so the pressure differential is the test...