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Greetings Dan, Is there any interesting data in the materials you received from the Captain? Those bars we are talking about are far more corroded then any of the surrounding metal. So I don't think it's steel. Perhaps if it's not zinc, it us aluminum. There is no rust coming from the chipped off paint on them. Ya I don't like overlapping metals like that on the exterior. Speaking of overlapping metal. I saw a overlapping saddle collar like I have around my conning tower on a new large storage tank that has a large access tube in the top like are Kittredge subs. Dan are the large holes drilled in the pod plates near the front of Persistence for pulling it down low if need be? I like your idea of using solid round bar stock rings. I think I can install a modified version of that, of which will be hidden in behind the inside of the leading edges of the keel skids. For this I would use round bar stock of the same diameter as the existing support between the front of the keels. Then weld in a quarter of a circle piece of those bars, with one end welded to the back of the existing bar support out about 2 inches and then weld the other end to the inside vertical surface of the 1/4" vertical plate of the skids. This would keep the rope or chain attached to the front keel support bar, from moving or bending said support bar. I do a lot of sandblasting for my furniture business and fine detail blasting for restoring old guns and machinery. http://www.frappr.com/?a=viewphoto&id=4001713&pid=10167592 I've learned that if you put two or more smaller compressors together, you can get enough CFM to do more commercial work if you don't have a larger compressor. I plan to do all the blasting my self using copper slag blasting media. It cuts twice as fast as silica, and is healthier for you to be around. Once I've removed every thing off the sub, I need to blast every part of the pressure hull inside and out. This way I can do a much better inspection for any pitting and/or visible cracks if there are any. Then I will spray on a cheap temporary high zinc primer to keep the rust down while I replace a few thru hulls and add a few weldments. Then I'll reblast every thing and apply a proper epoxy primer. "That man is the richest whose pleasures are the cheapest." ~ Henry David Thoreau Regards, Brent Hartwig From: Jumachine@comcast.net To: personal_submersibles@psubs.org Subject: Re: [PSUBS-MAILIST] Unknown Connection Bars on my K-250 Date: Sat, 12 Jul 2008 22:32:02 -0400 Brent,
If your reconditioning the sub anyway just remove them and toss them. Flat pieces bolted together like that are a place to get rust forming that you can't get at. Best if you toss those tabs and replace them with something made out of round stock welded in place. Maybe two U shaped rings.
Are you considering sand blasting the entire sub. If your going to strip it down and rebuild it, you may want to consider sand blasting. It's the easiest way to work with something like that. No paint to grind off, the rust is all gone and you can see what your working with. You need someone that has an industrial size blaster and a large compressor. Probably an half day job. It's not cheep but worth it in the long run.
Enjoy and good luck with it.
Dan H.
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