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Old 06-02-2014, 11:51 AM   #1
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Hose Clamps directions

I'm in a dispute and need some back-up, or to eat crow.

Under the waterline all hoses have two hose clamps. I was taught and always put one on in one direction, and the other, the opposite way around. I don't know why except Daddy did it that way on our boat.

Yesterday afternoon I was told that as long as two where there, they didn't have to be on in opposite directions. "It's the same" and I'm being too particular. Well, that's not the exact word used, but you get my drift.

On your boat, below the waterline or where ever you have two hose clamps side by side, are they run in the same direction or not?

[And should I eat crow, or can you provide me with a why you do it my way -- which I happen to think is correct!]
Thanks.
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Old 06-02-2014, 11:57 AM   #2
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Normally I put them on in opposite directions. I have no reasoning for doing that other than gut feel from my engineering background.
However when the situation is that I cannot easily get access to the screw in the opposite direction I put them in the same direction.
I have never experienced a failure that I can attribute to directional installation. (only to inadequate tightness, clamping on a piece of copper tube that has no barb, etc)
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Old 06-02-2014, 12:12 PM   #3
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Don't think it makes a bit of difference.
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Old 06-02-2014, 12:12 PM   #4
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The purpose of the second clamp is to keep the joint together should the other one fail. The joint is fine with one. But...

I put them on staggered as the clamping is not completely uniform around the circumference due to the bump of the screw part. Stagger them and it probably has a bit of a better seal. Splitting hairs there, though.
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Old 06-02-2014, 12:17 PM   #5
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Janice,

Funny you asked this question. I recently looked it up myself and learned that it indeed doesn't make a difference--us trawler owners are a particular lot! I am more concerned about accessibility. I also have several barbs under the waterline of my boat that will not permit two clamps. As I recall, ABYC only requires two clamps on the exhaust.
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Old 06-02-2014, 12:18 PM   #6
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I think Ski has it right. On the old serrated, screw clamps, the hose could bunch under the clamp, hence a bit of unequal pressure. Offset clamps even it up.

Of course I am making this up as I type, but feel free to use it to avoid eating crow!
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Old 06-02-2014, 12:19 PM   #7
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Whoops-not really "serrated", just the old clamps rather than the smooth ones.
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Old 06-02-2014, 12:31 PM   #8
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Well, rats. Crow it is.

Thanks all the same. I was wrong. Life is long so it surely won't be the last time I'm mistaken.
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Old 06-02-2014, 12:40 PM   #9
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Janice I think your DaDa was right but it is probably fly stuff most of the time and perhaps always.

It is something I do. Started doing it on my ultralight aircraft fuel lines to reduce the chance of sucking air in the two paces where, depending on the type of hose used where the hose can pucker up under the flat part of the clamp.
Clamps that employ two wires don't have the flat spots but can't be clamped as tight. One should have a hose that fits well and if so shouldn't require much clamping pressure. There are other types of clamps that don't have the flat spot.

To gain any benefit from clocking the clamps 180 they should be very close together.
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Old 06-02-2014, 01:49 PM   #10
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Well, rats. Crow it is.

Thanks all the same. I was wrong. Life is long so it surely won't be the last time I'm mistaken.
I don't think you are wrong just maybe splitting hairs.

I think Ski has it right...especially on smaller sizes and some clam types...the flat spot is obvious when you remove the clamp and it is no longer round.

I also agree that some barbs are too short for double clamping and if not "pressurized" I say phooey. I have come across so many hoses that the clamps were never tightened, or the screw or band has failed, etc...and the hose is environmentally welded to the hose bard and took superhuman strength and tactics to get it off anyway.

I have also started to agree with and I'm not positive it was boatpoker or not who thinks using reinforced vinyl hose in smaller applications instead of wire reinforced rubber wet exhaust hose is OK. Too many times have I seen the rubber hoses rotten and wire rusted and able to twist and break off while the vinyl hose while hardened is still tenaciously doing it's job.

I'm not sure where ABYC and many other get their ideas as to what is safe...but many don't seem to follow real world examples.
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Old 06-02-2014, 02:20 PM   #11
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I have also started to agree with and I'm not positive it was boatpoker or not who thinks using reinforced vinyl hose in smaller applications instead of wire reinforced rubber wet exhaust hose is OK. Too many times have I seen the rubber hoses rotten and wire rusted and able to twist and break off while the vinyl hose while hardened is still tenaciously doing it's job.
I agree with you about using the heavy duty vinyl "wire" reinforced hose in many cases where others would use the rubber reinforced version.

As to the clamp position question, the only time it may matter as to which way you put two clamps on is in some cases the barb is a bit short and if you stagger the clamps you can get them a bit closer together and there by get the clamps further up on the hose barb.
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Old 06-02-2014, 02:57 PM   #12
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I agree with you about using the heavy duty vinyl "wire" reinforced hose in many cases where others would use the rubber reinforced version.

As to the clamp position question, the only time it may matter as to which way you put two clamps on is in some cases the barb is a bit short and if you stagger the clamps you can get them a bit closer together and there by get the clamps further up on the hose barb.
I was actually referencing and thinking thread reinforced vinyl....the wire rusts and seems to hasten the demise of the hose as the weak spots are right along the rusty wire.
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Old 06-02-2014, 08:12 PM   #13
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I was actually referencing and thinking thread reinforced vinyl....the wire rusts and seems to hasten the demise of the hose as the weak spots are right along the rusty wire.
I was talking about the reinforced vinyl hose that has the plastic "wire" in it. Like sanitation hose or Tiger Flex. I would never use the vinyl hose with just the thread in it to replace rubber wire reinforced hose. The thread embedded style is way to likely to collapse or kink over time. Especially in a hot engine room environment.

In fact I don't use the thread reinforced hose for much of anything if I can help it. There are to many better alternatives.
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Old 06-02-2014, 08:26 PM   #14
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I have to agree that it likely doesn't make a difference but for us anal people it makes us feel better.
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Old 06-02-2014, 08:31 PM   #15
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The most satisfying way is to listen to what your own OCD tells you to do and stick with that.

Then go around and try to convert everyone to your way of doing it.

Just know that if you do them the opposite way like Janice does, your boat will sink at the dock while unattended and your insurer won't cover it.
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Old 06-02-2014, 08:57 PM   #16
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I was talking about the reinforced vinyl hose that has the plastic "wire" in it. Like sanitation hose or Tiger Flex. I would never use the vinyl hose with just the thread in it to replace rubber wire reinforced hose. The thread embedded style is way to likely to collapse or kink over time. Especially in a hot engine room environment.

In fact I don't use the thread reinforced hose for much of anything if I can help it. There are to many better alternatives.
Mine have outlasted the rubber wire reinforced hose on every boat I have has.

They only kink if you place a significant bend in them....and yes for certain applications with a lot of suction...then they may collapse, especially as they get very warm.

In truly hot places I would be less inclined to use them...just haven't encountered that yet on any boat I have owned and only a few I have run.

I would have to say in my experience the "better" or "recommended" hoses have done just the opposite in terms of long life and security.
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Old 06-02-2014, 09:13 PM   #17
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I would have to say in my experience the "better" or "recommended" hoses have done just the opposite in terms of long life and security.
Well as they say, YMMV. :-)
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Old 06-02-2014, 09:16 PM   #18
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My builder put them in opposite directions.

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Old 06-02-2014, 11:02 PM   #19
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To bad your builder didn't see fit to use better clamps. Personally I would change them out if I was going to be owning the boat for any length of time.
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Old 06-02-2014, 11:08 PM   #20
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The clamps' screws should be at least 120 degrees apart. 180 is fine. The workings of the clamps is the same regardless of the orientation.

The thing to keep in mind is that when one goes to work on them it is way easier to get the job done when they can both be worked on from the same positioning of your body. In other words align everything so access when in service is easy.

Mark are those clamps round ends that use just a screwdriver? It looks like they are the kind that keeps the blade captured to prevent slipping, which is okay, but I really greatly prefer the kind that can be adjusted with a 5/16" nut driver. Any size of nut driver prefered, but it so nice to know what tool to grab for any hose clamp job. I have made it a point to get replacements that are 5/16" driven. I also really like the tee handled torque nut drivers plumbers use. Getting those clamps to be not too tight or too loose is much simpler with one. And the price is right because they can be obtained from the plumbing dept of the big box store - where they don't say marine.
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