[PSUBS-MAILIST] strain relief

Sun Dec 6 12:58:09 EST 2020

Been meaning to respond to this thread. Late with my input but I liked the
thread.

I ran across a few similar scenarios where a desired adapter couldn't be
found in SS. I considered some welding solutions to stay with SS but in the
end chose to go with my "second choice" material (normally nickel plated).
Whatever I chose it had to be of the appropriate pressure rating.

For my application, 250ft, fresh/salt water I felt minimal non SS material
still works. My plan is to keep an eye on those non SS pieces and replace
as/if needed.

Steve

On Thu, Dec 3, 2020 at 12:52 PM Rick Patton via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hank
> Yes I like to TIG anything like that, just still kicking myself for not
> checking their ratings before I got this far. Oh well, if it was easy
> building a sub, everybody would be doing it.
> I guess you are getting ready to break out the ice picks now due to winter
> arriving?
> Rick
>
> On Thu, Dec 3, 2020 at 6:10 AM hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Rick, that will work, I imagine you will Tig weld  those on.  Anything
>> else would be tough.  I personally can't afford all the fancy SS
>> parts and pieces, in fact I just finished making 4 new penetrators with a
>> total of 20 wires and drilled and tapped 4 holes in the hull.
>> Hank
>>
>> On Wednesday, December 2, 2020, 10:38:22 AM MST, Rick Patton via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> I was curious on what made me go with a 1/2" standard NPT female thread
>> for passing all electrical wires thru the hull and using a Subcon strain
>> relief fitting as I knew I wouldn't of just pulled it out of the air and I
>> saw on the K-350 blue prints a couple of fittings that were called out as a
>> 1/2" NPT male thread using a SS schedule 80 nipple. These were to blow down
>> the MBT's and not for any electrical penetrators and there was a thread a
>> long time ago where Subcon popped up so I went to them to order the
>> fittings without doing my homework and asking what they were rated at.
>> Rather than drill them all out and re tap for metric, I will get my local
>> machine shop to make some short ss pieces just long enough to take a blue
>> globe fitting and then weld them on the outside of all my thru hulls to
>> change them over.
>> Rick
>>
>> On Tue, Dec 1, 2020 at 5:25 PM hank pronk via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> Rick,
>> I use a cordless drill for that stuff, because I can hold it back from
>> twisting out of my hands.
>> Hank
>>
>> On Tuesday, December 1, 2020, 6:51:12 PM MST, Rick Patton via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> Hank
>>
>> If I could put the fittings in a vice or milling machine, it would be a
>> no brainer but these are already welded into the hull and so would have to
>> be drilled out free hand with an electric 1/2" drill motor and I broke a
>> finger trying to enlarge a hole as the bit stopped and the motor kept
>> spinning and I wasn't able to let go of it fast enough. Gonna pressure test
>> the ones I have to see at what point they extrude the wire but I still have
>> to either drill out and re tap like you say or have a metric fitting welded
>> to the existing fittings that are already in the sub.
>>
>> Rick
>>
>> On Tue, Dec 1, 2020 at 2:54 PM hank pronk via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> Rick,
>> Drill them out to the closest size and thread them to metric.
>> Hank
>>
>> On Tuesday, December 1, 2020, 10:33:32 AM MST, Rick Patton via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> Hank
>>
>> No, cost wasn't the factor, it was that I can't find a vendor who makes
>> the fitting in the 1/4" NPT size ss fitting that I had machined and welded
>> into the front dome years ago. 3/8" is the smallest that vendors go down
>> to. All my fittings that accept a strain relief fitting except the two in
>> the front are 1/2". I'll have to go back threw the prints to see where I
>> would of gotten the 1/4" from as I know I wouldn't of just pulled it out of
>> the air. My preference now would be a blue globe fitting as they can take
>> much more pressure but they are made by a German company and only offered
>> in Metric and all my existing threw hulls are a standard NPT thread.
>> Rick
>>
>> On Tue, Dec 1, 2020 at 12:05 AM hank pronk via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> Rick, I just did a google search on how well nickel stands up to salt
>> water.  Turns out, it is good.  I am sure SS is better of coarse, but
>> the reality of owning a P Sub is, they are not in the water much.  I
>> assume you are asking because they are a lot cheaper.  Another reality
>> of owning a Psub, they are expensive.  I assume you will be putting
>> sacrificial anodes on the hull.  I would use them and keep an eye on them.
>> I admit, I am not as concerned about this as others, that is because I am
>> spoiled in fresh water.
>> Hank
>> On Monday, November 30, 2020, 12:51:26 PM MST, Rick Patton via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> I was wondering if it was OK to use a nickel plated brass strain relief
>> fitting to pass a cable through?
>> Rick
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