[PSUBS-MAILIST] High Pressure Port Dimensions

[Sean T. Stevenson via Personal_Submersibles]

Incidentally, the particular fitting I mentioned is 9.1 mm (0.36") deep on the straight thread.

Sean


On November 5, 2016 7:36:51 AM MDT, "Sean T. Stevenson via Personal_Submersibles" <personal_submersibles at psubs.org> wrote:
>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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