[PSUBS-MAILIST] CNG tank

Tue May 28 21:00:09 EDT 2019

 Brian,Mine are made by Quantum I think,  made in California.  They are 138 lbs each empty.Hank
    On Tuesday, May 28, 2019, 6:50:11 PM MDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 This tank it seems was shipped with a fair amount of gas in it !  I've been draining it for a while now.  This tank has an electrical valve on it.  Also has a pressure relief valve .  Once I'm done draining it  ( by unscrewing slightly the PR valve) I'm going to take off the pressure relief valve and see if I can match up the threads at a hydraulic place.  I tried a 3/8" thread but it would not thread.  We have a type 3 manufacturer very close by and he gave me some info on the various threads that are used.  
Hank , who is the manufacturer of your tank?  

Brian

--- personal_submersibles at psubs.org wrote:

From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] CNG tank
Date: Wed, 29 May 2019 00:14:42 +0000 (UTC)

 Brian, I have no idea what pressure it can take with no air in it.  It should be a reasonable amount given the thickness of the shell.  My tanks have a strait thread  with an o-ring.  It makes no sense to have a taper thread with an o-ring.  The taper thread (pipe thread) seals on its own.  I have steel CNG tanks with a pipe thread valve but I am sure the type 4 carbon  fibre tanks are not pipe threadHank
    On Tuesday, May 28, 2019, 5:51:48 PM MDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hank ,   Any idea what pressure those tanks would take with no internal pressure ?
Brian

--- personal_submersibles at psubs.org wrote:

From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] CNG tank
Date: Tue, 28 May 2019 22:11:48 +0000 (UTC)

 Not on mine, all right hand threadHank
    On Tuesday, May 28, 2019, 3:48:21 PM MDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 There is a fill fitting on this tank that seems like it is reverse thread

--- personal_submersibles at psubs.org wrote:

From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] CNG tank
Date: Tue, 28 May 2019 21:40:58 +0000 (UTC)

 Brian,The fittings are no problem, I just went to the hydraulic shop and got new ones.Hank
    On Tuesday, May 28, 2019, 2:48:18 PM MDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 My CNG tank finally got here !   Very impressive tank, looks like there are standard fittings on it , so shouldn't be much trouble putting the appropriate valves on.  
Brian

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