[PSUBS-MAILIST] strain relief

[Rick Patton via Personal_Submersibles]

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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