[PSUBS-MAILIST] strain relief

Thu Dec 3 11:09:11 EST 2020

 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, butthe 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 realityof 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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