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Old 03-25-2019, 06:03 PM   #1
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One Hose Clamp or Two???

On a seacock, The prefered method is two hose clamps. This is a AYBC recommentation, but not a requirement.

Bronze nipple is long enough to put two perferated worm gear hose clamps, or one nice wide T-bolt clamp.

Theoretically I could fit one worm gear and one tbolt clamp if it makes any difference.

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Old 03-25-2019, 06:13 PM   #2
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Go for two. You won’t pass an insurance survey if you only have the one. No logic just a box that some ticks off.
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Old 03-25-2019, 06:18 PM   #3
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Most seacock hoses have wire in them to keep them from crushing. The T bolt can certainly be tightened more and is undoubtedly a stronger design. If you want to use 2 clamps, make one the T bolt or upgrade to the better quality worm clamp, some don't have slots and are stronger.

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Old 03-25-2019, 06:18 PM   #4
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The T bolt clamp is a lot more secure than the worm gear hose clamps pictured. You should use hose clamps with no perforation. The perforated types corrodes easily. ABA and Trident hose clamps are non perforated.


Whether one T bolt or two non perforated types would be best, I don't know. About the same I would guess.


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Old 03-25-2019, 06:19 PM   #5
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Go with 2 instead of 1. If one breaks and it is the only one on there what do you have left? If you have 2 and one fails you still have one left.
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Old 03-25-2019, 06:53 PM   #6
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"ABYC H-27 SEACOCKS, THRU-HULL FITTINGS, AND DRAIN PLUGS"
Does NOT require double clamps on any seacock.

Other ABYC Standards do require double clamps on fuel fill hoses and exhaust hoses.

I believe a second clamp on a seacock is a good idea .... Only if you have double checked that the spud/nipple is long enough to properly support a double clamp. It is an old mechanics trick to tighten a second clamp (off the nipple) to pull off recalcitrant hoses.
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Old 03-25-2019, 07:33 PM   #7
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Quote:
Originally Posted by boatpoker View Post
"ABYC H-27 SEACOCKS, THRU-HULL FITTINGS, AND DRAIN PLUGS"
Does NOT require double clamps on any seacock.

Other ABYC Standards do require double clamps on fuel fill hoses and exhaust hoses.

I believe a second clamp on a seacock is a good idea .... Only if you have double checked that the spud/nipple is long enough to properly support a double clamp. It is an old mechanics trick to tighten a second clamp (off the nipple) to pull off recalcitrant hoses.
Since when does ABYC create boating laws? They recommend, they can not "Require."
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Old 03-25-2019, 07:41 PM   #8
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I have never seen a surveyor not write up a seacock that was not double clamped.
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Old 03-25-2019, 07:52 PM   #9
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Since when does ABYC create boating laws? They recommend, they can not "Require."
Who said anything about "laws" ?
Silly semantics. Should one aspire to meet ABYC Standards certain methods are "required". If you choose not to meet them, No one really cares ..... except the insurance companies.
I was simply replying to incorrect statements about ABYC Standards.
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Old 03-25-2019, 07:55 PM   #10
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I understand the arguments against double clamping in cases where it means narrower clamps or where the nipple is too small, etc.

...but, I am also in the situation that every survey I've ever met writes it up and recommends fixing it. So, now, every time I touch a hose attached to a thru hull (directly or indirectly) and below the water line, I check and make sure it is double clamped and address if not.

I figure that, although surveyors seem to miss a lot of costly things, and flag some silly things, for the most part they are guarding against vessel losses -- and most vessel losses occur at the slip and for a reason. If they are so commonly poking at double clamping, I figure it has probably caused some losses and is easy to find and easy to fix. So, I do.
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Old 03-25-2019, 08:16 PM   #11
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Thanks Guys!

I decided to use the one t-bolt, plus the perferated hose clamp.

The 2nd hose clamp is as boatpoker indicated not required by AYBC, but as several mentioned it will draw the attention of a surveyor, so IO figured Iíd end run that problem.

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Old 03-25-2019, 10:50 PM   #12
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I once had a strainer whose barb was two short for effective double clamping. I tried to explain it to the surveyor, he would have none of it. Finally I added a second clamp and made it just snug. While the second clamp was worthless it passed survey. Not recommending this and eventually the strainer was replaced. Sometimes the world gets lost in the letter of the law as opposed to the intent.
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Old 03-25-2019, 11:21 PM   #13
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Quote:
Originally Posted by djmarchand View Post
The T bolt clamp is a lot more secure than the worm gear hose clamps pictured. You should use hose clamps with no perforation. The perforated types corrodes easily. ABA and Trident hose clamps are non perforated.


Whether one T bolt or two non perforated types would be best, I don't know. About the same I would guess.


David


David, what do you mean by non perforated? Isnít that what tightens the band at the worm gear ?
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Old 03-26-2019, 12:08 AM   #14
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Awab brand hose clamps do not have perforations and are a great to use,
See this link.
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Old 03-26-2019, 12:19 AM   #15
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I am converting my boat over to AWAB clamps as time permits.
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Old 03-26-2019, 12:32 AM   #16
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I really don’t have issue with perforated hose clamps. I replace hose clamps if they show any signs of corrosion. I doubt if any of my hose clamps are over 10 years old.
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Old 03-26-2019, 12:42 AM   #17
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It’s not that the perforated clamps rust more, but that they are not as strong and also can cut the hose. Usually where clamps rust is the screw because a lot of “all stainless “ clamps have a stainless strap but a ferrous screw that will rust. When I used to buy a clamp off the shelf that isn’t an AWAB clamp, I check it with a magnet to make sure it really is all stainless. Now I finally broke down and spent about $400 and bought an AWAB kit and many boxes of AWAB clamps so I have them in stock. Now I just have to get time to change out all the old perforated clamps.
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Old 03-26-2019, 01:24 AM   #18
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Got it great info. Thanks
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Old 03-26-2019, 04:41 AM   #19
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Quote:
Originally Posted by Comodave View Post
Itís not that the perforated clamps rust more, but that they are not as strong and also can cut the hose. Usually where clamps rust is the screw because a lot of ďall stainless ď clamps have a stainless strap but a ferrous screw that will rust. When I used to buy a clamp off the shelf that isnít an AWAB clamp, I check it with a magnet to make sure it really is all stainless. Now I finally broke down and spent about $400 and bought an AWAB kit and many boxes of AWAB clamps so I have them in stock. Now I just have to get time to change out all the old perforated clamps.
Comodave,

Did you find a good price by buying a lot of AWAB clamps at once? One at a time can be pricy..... same with the T bolt.
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Old 03-26-2019, 04:52 AM   #20
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Quote:
Originally Posted by ksanders View Post
Thanks Guys!

I decided to use the one t-bolt, plus the perferated hose clamp.

The 2nd hose clamp is as boatpoker indicated not required by AYBC, but as several mentioned it will draw the attention of a surveyor, so IO figured Iíd end run that problem.

Thanks!!!
I could make an argument against using one strong and one weaker clamp. Use the same kind of clamp for double clamping.
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