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Old 05-08-2014, 08:27 PM   #1
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Should I be surprised??

One of the projects on my list before splash this spring was to install a Perko raw water strainer since the Volvo plastic basket strainer is not transparent and must be disassembled to see that it has nothing in it. Since all the hoses on the boat were replaced by the PO as a requirement of the insurance company due to the survey when he purchased her, I thought this would be straight forward. One thing that I did notice was that there were only single clamps on all fittings below the water line and that all clamps were perforated. Since I was going to add a clamp anyway I would change them to non perforated and double up. Well when I took off the raw water hose much to my surprise was a pipe nipple not a hose barb and not long enough for a double clamp. I mentioned this to the marina mechanic and he indicated that this was very common in older boats. Well I fixed it regardless. Are there any other issues in older boats that may have been ok at the time but not acceptable in this day and age??? Would this worry you?
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Old 05-08-2014, 08:36 PM   #2
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I see no bonding of the fixture. I suppose you are in freshwater in Ontario. Probably not as important there. Did I miss something?
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Old 05-08-2014, 08:42 PM   #3
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Quite the norm in fresh water Don. Does not seem to be an issue. The fittings are all original 1981 and appear to have no degradation.
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Old 05-08-2014, 08:59 PM   #4
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Greetings,
Mr. L. I see no issues with the original install but your fix is probably better. Is the hose nipple bronze?
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Old 05-08-2014, 09:07 PM   #5
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Agree with RTL. At least half of my below-waterline fittings aren't long enough for double clamps, but I do use the best quality clamps I can get. I like your fix......good idea.
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Old 05-08-2014, 09:24 PM   #6
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Quote:
Originally Posted by RT Firefly View Post
Greetings,
Mr. L. I see no issues with the original install but your fix is probably better. Is the hose nipple bronze?
Yes RT, the nipple is bronze thank goodness. It never let go but I was scared that the sharp threads would cut the inside of the hose.
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Old 05-08-2014, 09:31 PM   #7
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Hoses clamped to pipe nipples was (is still) a common poor practice. Not the best clamping surface for the hose. I found it on my 1981 vintage boat as well.
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Old 05-09-2014, 12:22 AM   #8
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It looks like you did a nice job.

"It never let go but I was scared that the sharp threads would cut the inside of the hose."

I'll admit to using a pipe nipple instead of a hose barb in the past, but I've always used a longer nipple and cut the threads off the end. The hose is clamped onto the smooth side of the nipple with two clamps and I've never had one come off. Yes a hose barb is preferred but sometimes you just can't find the right size and this does work well at the typical low pressures found boat water systems. Don't think I'd do it on the high pressure side of a water maker.
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Old 05-09-2014, 12:45 AM   #9
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Is the barb you installed bronze or brass? I ask cause it looks like brass.
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Old 05-09-2014, 06:13 AM   #10
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Greetings,
Mr. d. Post #6.
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Old 05-09-2014, 07:08 AM   #11
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Is the barb you installed bronze or brass? I ask cause it looks like brass.
Bought through a marine supply and was told that it is bronze and the literature on line was quoted as bronze as well.
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Old 05-09-2014, 11:07 AM   #12
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HopCar wrote;
"I'll admit to using a pipe nipple instead of a hose barb in the past, but I've always used a longer nipple and cut the threads off the end. The hose is clamped onto the smooth side of the nipple with two clamps and I've never had one come off."

I agree but I'd like something that's bigger on the end that will stop the hose clamp from sliding off. With good clamps, low pressure and regular maintenance that should be an OK to good hookup.

What are the hose fittings that just have a bump at the end called ... bib?
I much prefer them to the typical mufti-barbed fitting.
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Old 05-09-2014, 11:48 AM   #13
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Our 86' Nova sundeck has a receptacle on the fly bridge with both AC and DC. The feeds come from the same terminal block. Of course there is no color coding on the whole boat, except for the engines. In the event of a ground or a short it is far easier to just run new wiring than try to find the fault.
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Old 05-09-2014, 01:14 PM   #14
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When it comes to old through hull fittings (in salt water) my first choice is replacement with something like Forespar black plastic units. No corrosion no grounding and like your body if exercised a little they work fine.
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Old 05-09-2014, 02:25 PM   #15
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Maybe the reason it is not corroded is because it was not "bonded". Fresh or salt, its all conductive.
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Old 05-09-2014, 05:04 PM   #16
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Eric, I know the type you're talking about but I don't think I've ever seen them in bronze. Back in my ill spent youth when I was playing with little airplanes we used aluminum versions of what you describe. You're right, a bronze one would be very nice in an application like the OP has described.
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Old 05-09-2014, 05:19 PM   #17
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Quote:
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Eric, I know the type you're talking about but I don't think I've ever seen them in bronze. Back in my ill spent youth when I was playing with little airplanes we used aluminum versions of what you describe. You're right, a bronze one would be very nice in an application like the OP has described.
That would be called a beaded hose barb.
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Old 05-09-2014, 05:40 PM   #18
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LaBomba, what is your procedure for cleaning out the raw water screening? Haven't seen the need yet, but it's obvious on my manifold. (Since I've a single engine, no genset, nor raw-water washdown, two of three inlets aren't used.)

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Old 05-09-2014, 06:04 PM   #19
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That barbed fitting looks more like brass than bronze which is not a good mix on a bronze throughull due to galvanic potential and its very likely that the valve is NPT while your barbed fitting is NPS which means it is probably only on there by 3 threads and there is no backing plate under the seacock.
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Old 05-09-2014, 06:59 PM   #20
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That barbed fitting looks more like brass than bronze which is not a good mix on a bronze throughull due to galvanic potential and its very likely that the valve is NPT while your barbed fitting is NPS which means it is probably only on there by 3 threads and there is no backing plate under the seacock.
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Bought through a marine supply and was told that it is bronze and the literature on line was quoted as bronze as well.
Hard to tell from an internet photo, but LaBomba confirmed it was bronze.
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