[PSUBS-MAILIST] cable fittings

Sat Jun 20 14:20:19 EDT 2020

They have a pretty good online catalog that list all the specifications.

On Sat, Jun 20, 2020, 1:56 PM Rick Patton via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> I have them down to call with that number on Monday.
> Thanks
> Rick
>
> On Sat, Jun 20, 2020 at 4:32 AM Steve McQueen via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Rick, have you research the Conax PG series? I am using PG5-500-A-N to
>> pass a 2 wire jacketed cable from my rear thruster through the hull. They
>> offer a pretty good variety in this series.
>>
>> On Mon, Jun 15, 2020, 1:28 PM Rick Patton via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>>> Just called Sealcon to confirm how they rate their strain
>>> relief fittings and they base it on line pull so the ones I have won't
>>> work. they said that they also sell a cable clip that attaches to the cable
>>> on the pressure side to keep it from extruding so I might but one of them
>>> and do some testing to see if this will be an option or not.
>>> jRick
>>>
>>> On Tue, Jun 9, 2020 at 6:00 AM Alan via Personal_Submersibles <
>>> personal_submersibles at psubs.org> wrote:
>>>
>>>> Ian,
>>>>
>>>> https://www.macartney.com/what-we-offer/systems-and-products/connectors/subconn/
>>>> I'm not sure how you get Psub discount. I got some through Jon the
>>>> facilitator / owner
>>>> of the group a long time ago.
>>>> He normally reads the emails & will comment if you have a question.
>>>> There may be an email link to Jon, or more info on the Psub web site.
>>>> He's based in NY, so just a submarine ride away!
>>>> Cheers Alan
>>>>
>>>> On 10/06/2020, at 1:07 AM, Ian Juby via Personal_Submersibles <
>>>> personal_submersibles at psubs.org> wrote:
>>>>
>>>> :O  That's them!  Subcon eh? I'll look them up. Psubs gets a discount?
>>>> How does that work?
>>>>
>>>> Ian
>>>>
>>>>
>>>> On Mon, Jun 8, 2020 at 6:46 PM Alan via Personal_Submersibles <
>>>> personal_submersibles at psubs.org> wrote:
>>>>
>>>>> Thanks Ian,
>>>>> I have those type of penetrators (below). Psubs gets a discount from
>>>>> subConn
>>>>> that makes them.
>>>>> Would be a bit difficult making them yourself & the bought ones have a
>>>>> securing
>>>>> device so they can't pull apart ( orange thing in photo).
>>>>> I agree that there wouldn't be much call for wet mating them, & that
>>>>> it would just
>>>>> be an opportunity for corrosion.
>>>>> Alan
>>>>>
>>>>> <image1.JPG>
>>>>>
>>>>> On 9/06/2020, at 5:43 AM, Ian Juby via Personal_Submersibles <
>>>>> personal_submersibles at psubs.org> wrote:
>>>>>
>>>>> Hi Rick,
>>>>> I saw your post and wanted to ask if you meant electrical or plumbing
>>>>> through hull connections. So I'm glad you reposted because I haven't been
>>>>> able to follow the thread, nor have I had the time to go back and look
>>>>> stuff up.
>>>>> When I was working R&D on our diver heater system, we used a
>>>>> watertight bulkhead connector for the shot line and remote control.
>>>>> Unfortunately, this was over 20 years ago and I was not the one who
>>>>> actually ordered the connector. So I innernets'd some pictures to try and
>>>>> hopefully find it again because I remember quite well what it looked like,
>>>>> its design and construction. The closest thing I could find was Teledyne
>>>>> Marine's "Wet mate" connectors:
>>>>> http://www.teledynemarine.com/electrical-wet-mate-connectors/
>>>>> I couldn't tell you the price, but I'm sure they weren't cheap. For my
>>>>> ROV project, I'm still in the rough design phase and I keep increasing its
>>>>> depth capabilities. So I'm just going to make my own through-hull
>>>>> connectors, and they will be similar to this design.
>>>>> The through-hull seal is accomplished by a simple and reliable o-ring
>>>>> (which doesn't appear in teledyne's picture). Basically, the rubber
>>>>> connector body is mounted to a brass threaded tube that goes through the
>>>>> bulkhead. The brass threaded tube has a seat for an o-ring which gets
>>>>> compressed by both the nut and external water pressure. Here, I drew a
>>>>> pretty picture:
>>>>>
>>>>> <bulkhead connector.jpg>
>>>>> I just realized I didn't mark the brass tube, but it's the part that
>>>>> goes through the bulkhead.
>>>>> The particular connector we were using only needed to go to like, 300
>>>>> feet. I believe we tested the heater unit to 300 psi and ironically, it was
>>>>> the swagelock fittings inside the unit that leaked - that electrical
>>>>> connector never leaked. We had I think 8 electrical connections passing
>>>>> through that? We could get the identical connector as a straight-through
>>>>> connector, and not an angled connector like my drawing.
>>>>> The pins and sockets were the solid style - in other words there was
>>>>> no splits to allow for expansion or contraction of the sockets or pins.
>>>>> This further added to the waterproof nature as now the wire (a possible
>>>>> leak point) was buried in solid rubber, behind a solid metal socket which
>>>>> itself was buried in solid rubber. Any water wicking along would have to
>>>>> travel 1/2" along the metal/rubber just to get past the socket.
>>>>> The connector body was a hard rubber, both the through-bulkhead block
>>>>> and the male connector. Under high pressures, the water can wick along the
>>>>> inside of the wires (between the copper and the outer insulation) or if you
>>>>> pass the wire through say, silicone rubber, it can wick along the junction
>>>>> of the outside of the wire and the encasing rubber. So the longer that
>>>>> travel distance is, the higher the pressure needs to be to force water
>>>>> through those avenues. That rubber block was only maybe 2 inches left to
>>>>> right in my drawing. I don't remember what pressures or depths it was rated
>>>>> for, but I guarantee you it could take a LOT of pressure. Mechanically
>>>>> (because the bulkhead hole was small) and in keeping watertight. The
>>>>> biggest risk for a leak was if the bulkhead got a scratch where the o-ring
>>>>> seated against it. I have no doubt that connector could have taken
>>>>> hydraulic pressures (thousands of PSI).
>>>>> I did not draw this in my pretty picture, but the head of the brass
>>>>> tube probably had multiple rings inside the rubber, both to get good
>>>>> mechanical locking between the rubber body and the brass body, and to make
>>>>> the greatest distance the water would have to travel to get around from
>>>>> outside to inside the tube, if it were to wick along the junction between
>>>>> brass and rubber. But I'm speculating there because I didn't cut one of
>>>>> those connector$ open to find out. Lest I get fired and stuff for
>>>>> destroying a connector worth hundreds of dollars, you know.  :D Just, when
>>>>> I go to make my own connectors, I'll be making the mounting tube like that,
>>>>> for those reasons. The rubber that made up the connector body filled
>>>>> everything, including right to the bottom of the brass tube.
>>>>> The nice thing about making your own connector as well is that you can
>>>>> make the electrical pins, sockets and wires any size you want to match your
>>>>> electrical current needs.
>>>>>
>>>>> These particular connectors could be plugged and unplugged underwater,
>>>>> but I suspect it would be very difficult to do as it would have to displace
>>>>> water or vacuum from the connector holes. But as you can see, the male pins
>>>>> had insulating rubber for a part of their length to maximize the distance
>>>>> the electricity would have to travel from pin to pin, thus maximizing the
>>>>> electrical resistance from pin to pin as well.
>>>>> Hope that helps,
>>>>> Ian
>>>>>
>>>>>
>>>>> On Mon, Jun 8, 2020 at 12:09 PM Rick Patton via Personal_Submersibles <
>>>>> personal_submersibles at psubs.org> wrote:
>>>>>
>>>>>> I posted the other day about cable threw hull water tight fittings
>>>>>> and only got one response back and was hoping for more feed back as I know
>>>>>> most of you probably don't make your own so for the ones that buy them, is
>>>>>> Blue Globe the only player out there besides sealcon?
>>>>>> Thanks
>>>>>> Rick
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