[PSUBS-MAILIST] strain relief

Sun Dec 6 14:44:39 EST 2020

I honestly think that a nickle plated fitting would be fine as the body
that screws into the thru hull fitting would certainly take the pressure,
it's the plastic or rubber thing inside that compressed that does all the
work I believe, but an anode on the hull is still a wise idea as it may be
more susceptible to corrosion due to stray current and dissimilar metals.
Rick

On Sun, Dec 6, 2020 at 7:59 AM Steve McQueen via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> 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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