[PSUBS-MAILIST] S101

Wed Feb 22 13:55:40 EST 2017

The valves need to be as close as practicable to the hull penetration, but "practicable" has to take into account accessibility and ergonomics of operation in addition to mere distance. Having elbows, nipples, short tubes or similar fittings in order to facilitate a streamlined assembly or useful valve orientation wouldn't bother me in the least, provided that you don't mechanically load the intermediate fitting(s), meaning that valves have to be mounted or otherwise constrained so that grabbing the valve in a panic doesn't load those fitting(s). I would also give due consideration to the fact that failure of those intermediate fittings would likely be catastrophic, and design with heavier wall thicknesses or pressure ratings in those sections than working pressures would demand.

Downstream of your hull shutoff valve, your piping needs to be appropriately designed to operating pressures. Upstream of the hull shutoff valve, it needs to be bombproof.

Sean

On February 22, 2017 10:56:57 AM MST, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>I don't either but has anyone done this to their sub or am I the only
>one
>to think of this?
>
>Rick
>
>On Tue, Feb 21, 2017 at 7:30 PM, Brian Cox via Personal_Submersibles <
>personal_submersibles at psubs.org> wrote:
>
>> Rick,        I don't think 1/2" schedule 40 at the depths you're
>planning
>> to go would be an issue.
>>
>> Brian
>>
>> --- personal_submersibles at psubs.org wrote:
>>
>> From: Rick Patton via Personal_Submersibles
><personal_submersibles at psubs.
>> org>
>> To: Personal Submersibles General Discussion
><personal_submersibles at psubs.
>> org>
>> Subject: Re: [PSUBS-MAILIST] S101
>> Date: Tue, 21 Feb 2017 17:06:58 -1000
>>
>> I have 1/2" schedule 80 SS nipples welded in the end caps and hull in
>> places so the valves would just screw on the nipples with nothing in
>> between to break but wanted to keep things close as possible to the
>hull
>> for room but my only concern is that I would be putting one thing
>between
>> the valve and if it failed, I'd be screwed. It seems like a schedule
>40 SS
>> elbow would be pretty tough. Am I taking a change just to save some
>room?
>> Anyone else out there that has done this?
>>
>> Rick
>>
>> On Tue, Feb 21, 2017 at 1:36 PM, Alan James via Personal_Submersibles
><
>> personal_submersibles at psubs.org> wrote:
>>
>> Hi Rick,
>> external electrical penetrators can be bought either straight or with
>an
>> elbow.
>> You may create pressure on the bend turning the valve on & off. You
>could
>> check how sturdy the elbows are by tightening them up with a crescent
>&
>> leavering
>> on the nozzle portion. Additionally you might want to support the
>valve so
>> it doesn't
>> put any stress on the elbow.
>> Alan
>>
>>
>>
>> ------------------------------
>> *From:* hank pronk via Personal_Submersibles
><personal_submersibles at psubs.
>> org>
>> *To:* Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> *Sent:* Wednesday, February 22, 2017 11:23 AM
>> *Subject:* Re: [PSUBS-MAILIST] S101
>>
>> Rick,
>> Regardless if you use an elbow or nipple it is the same deal.  Even a
>> valve with a male pipe end on it could break off.  To my mind, if you
>can
>> keep the valve tight to the hull it is less likely to get knocked off
>and
>> is safer.
>> Hank
>>
>>
>> On Tuesday, February 21, 2017 3:18 PM, Rick Patton via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> Just wanted some feedback on something I would like to do. I wanted
>to put
>> a 90 degree elbow on all my threaded threw hulls first and then
>attach all
>> my hull stop valves to it to try and keep all the plumbing closer
>against
>> the hull for a little bit more room inside. I imagine it isn't ABS
>approved
>> but would this be a bad idea? The weak link of course would be the
>elbow.
>>
>> Rick
>>
>> On Sun, Feb 19, 2017 at 6:05 AM, hank pronk via Personal_Submersibles
><
>> personal_submersibles at psubs.org> wrote:
>>
>> Wow the S101 diesel sub is down to 135K and looking for offers.  That
>is
>> pretty darn good, and what a nice machine!
>> Hank
>>
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