[PSUBS-MAILIST] penetration schedule

Fri Aug 14 12:56:52 EDT 2015

Ineresting thread, we were just discussing the use of stainless on a steam boating sight I belong to. Stainless on stainless will always gall unless you use stainless never seize, or go stainless to bronze.

Hope that helps.

Keith T.

Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

>Hi Brian,
>
>I highly recommend a very small yet invaluable book Dan Lance once pointed
>me to. It is called The Oxygen Hacker's Companion, and the author is Vance
>Harlow. Oxygen is one area with specialized requirements that, if ignored,
>can result in a really bad day. Please be sure to read that book before you
>build anything that will handle O2.
>
>Best,
>
>Alec
>
>On Thu, Aug 13, 2015 at 11:58 PM, Brian Cox via Personal_Submersibles <
>personal_submersibles at psubs.org> wrote:
>
>> Hank,
>>              Can I put a bronze bushing in a ss coupling, if that is
>> necessary for the O2?   Does the O2 need to not go through stainless?
>>
>>   I had a bad experience connecting stainless nipples into a
>> stainless 90,  it galled so bad that I ruined the nipple getting it out of
>> there. Maybe I just need to use more Teflon tape.
>>
>> brian
>>
>>
>>
>>
>>
>> --- personal_submersibles at psubs.org wrote:
>>
>> From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org
>> >
>> To: "Personal Submersibles General Discussion" <
>> personal_submersibles at psubs.org>
>> Subject: Re: [PSUBS-MAILIST] penetration schedule
>> Date: Thu, 13 Aug 2015 20:46:45 -0700
>>
>> Hank,
>>              It seems to me that it's easier to weld in couplings rather
>> than nipples, I suppose it's just preference.   I sort of have a trim tank
>> already with my forward hard ballast tank, I'm just not sure at this point
>> whether or not that will be enough control.  A way to deal with varying
>> loads is probably something I need to address, but I don't want to give up
>> valuable cabin space for it.
>>
>> Brian
>>
>> --- personal_submersibles at psubs.org wrote:
>>
>> From: hank pronk via Personal_Submersibles <
>> personal_submersibles at psubs.org>
>> To: Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> Subject: Re: [PSUBS-MAILIST] penetration schedule
>> Date: Thu, 13 Aug 2015 18:23:16 +0000 (UTC)
>>
>> Brian,
>> I would add a few nipples and cap them off, you will want them down the
>> road.
>> A trim tank may be a good idea for such a heavy sub, unless you have real
>> powerful vertical thrusters.  I find when I take a passenger, even my
>> daughter Roman who is light as a feather, I am always quite over weight.
>> That is no problem at all in a Gamma size sub because the vertical
>> thrusters have enough jam to stop the sub hitting bottom.  A trim tank
>> would be good to keep you closer to ideal weight, or have lots of small
>> weights to take out.  I foolishly made two rather heavy lead weights.
>> Are you running your O2 through a ss nipple, is that okay, I am planning
>> to do that for external O2.  I remember talk about the K subs needing a
>> Bronze fitting or something like that.
>> Hank
>>
>>
>>
>> On Thursday, August 13, 2015 11:52 AM, Brian Cox via Personal_Submersibles
>> <personal_submersibles at psubs.org> wrote:
>>
>>
>> Hank,
>>             Here are all my penetrations:
>>
>> Front hard ballast tank
>>  1.   flood valve -  1/2" ss rod thru hull
>>  2.   vent valve
>>  3.  air inject    -  ss coupling
>>
>> Main ballast tank (soft)
>>  1. flood valve  - ss 1/2" rod thru hull
>>  2. air inject
>>
>> mechanical penetrations:
>>   1.  front flaps       - ss 1/2" rod thru hull  (all)
>>   2. back flaps
>>   3. motor turning   ( steering )
>>
>> Breathing Oxygen  -  3/4" coupling  or smaller  ( will bush)
>>
>> Flood Valve  - 1 1/2"  - ss coupling  ( near bottom)
>>
>> main ballast HP air in   -
>>   #1 - 3/4"  ss coupling
>>   #2 - 3/4"     ( will have bushings to 1/2" or smaller)
>>
>>
>> Gauges
>>   1.  Temperature  - 1/2"   ss coupling
>>    2.  Pressure -    1/2"
>>
>> Release buoy
>>   1.  1/2" SS rod thru hull
>>
>> Equalizing valve
>>   1.  3/4" coupling
>>
>> Drop weight
>>    1.  7/8" ss rod thu hull
>>
>> Hatch dog thu hull
>>  1.  7/8" ss rod
>>
>>  Is there anything that I obviously forgot ??      All my electrical will
>> be going through a separate viewport fitting.
>>
>> So far I have the front trim, hatch , but no air yet.
>>
>> Not sure if I want to have a small trim tank in the main cabin or not.
>>
>>
>> Brian
>>
>>
>>
>>
>>
>>
>>
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