[PSUBS-MAILIST] High Pressure Port Dimensions

[hank pronk via Personal_Submersibles]

Alan,There must be a how many threads per mm to how much psi chart out there.  You would think if the plug is 7.16 mm long, then that should be your bench mark.Hank 

    On Friday, November 4, 2016 10:23 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 I am still in the process of ordering some pressure transmitters that
will screw in to the high pressure port of a scuba tank. Have had a 
number of quotes, & it looks like some manufacturers will do a limited
run with the non standard 7/16 UNF thread. I am not sure what to 
specify with regard to thread length. Have measured 3 hp ports &
they are around 11.5mm deep. The depth gauge thread that screws 
in to it is about 8.76mm long & the blank / plug that fits in the port is 7.16mm long.
Any transmitter thread length over the port depth will bottom out & not 
be able to compress the  o-ring which is on the pressure transmitter.
I was thinking of specifying 10mm but wondered if there was an industry 
standard length. 
Am nit picking a bit here but want to get it right, as others may want to
order the same product if it works well.
Regards Alan


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