[PSUBS-MAILIST] High Pressure Port Dimensions

[Sean T. Stevenson via Personal_Submersibles]

Sorry that I have only been following these threads sporadically, or I would have replied sooner.

7/16-20 UNF is the same thread as SAE/MS in the same size. It is probably more cost effective to use an o-ring sealed adapter to NPT (such as a Swagelok SS-4-SAE-7-4) and an industry standard male NPT transducer, than trying to source a transducer with the o-ring sealed straight thread fitting.

Sean


On November 5, 2016 6:16:37 AM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>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
>
>
>Sent from my iPad
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