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05-15-2019, 10:47 AM
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#1
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Veteran Member
City: Green Cove Springs
Join Date: Jan 2019
Posts: 83
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Perforated Stainless Hose Clamps
I am convinced boats are held together by hose clamps and zip ties. I started in the bilge and I have been changing all the hose clamps (and a lot of the hoses) on our boat from perforated to stamped. They were all stainless steel of various quality but I have so far found five that had failed across the webbing. Two fell off when I touched them. All the failed ones showed signs of corrosion and the failures were sometimes out in the open and sometimes under the screw thread.
Here is an example:
I didn’t start collecting them until I was someway through the process but here is my collection to date:
The experts are right when they say these things have no place on a boat.
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05-15-2019, 12:06 PM
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#2
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,191
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Yes the perforated ones will break. I prefer AWAB brand, rolled edge and non perforated.
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05-15-2019, 01:35 PM
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#3
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Guru
City: Tri Cities, WA
Join Date: Nov 2012
Posts: 4,406
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Being the non-mekanyik sort of guy that I am, and being familiar with only the type of clamp shown in the photos above, what else is there? Help this poor, stoopid guy out, will ya?
__________________
Mike and Tina
1981 Boston Whaler 13'
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05-15-2019, 01:45 PM
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#4
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,191
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I like AWAB clamps. They are more expensive but they are 316 S/S. They are a bit cheaper if you buy them by the box. Just google AWAB hose clamps
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05-15-2019, 02:55 PM
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#5
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Guru
City: Quebec
Vessel Name: Bleuvet
Vessel Model: Custom Built
Join Date: Jan 2016
Posts: 4,375
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I am using this kind of clamp
Only thing is that you have to lnow the external diameter of your hose as the range to tight them is shorter.
L
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05-15-2019, 03:31 PM
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#6
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Guru
City: Anacortes
Join Date: Nov 2012
Posts: 1,189
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I would generally agree and personally purchase awab clamps as well. Well worth the cost.
But to be a bit contrarian, I lived through decades without any near misses on the old style worm clamps and even today, few stores have the nicer clamps on stock. When that happens, it’s not a blocker for me. The condition of the clamps you are removing is much worse than what you should see, even with that clamp style. First, those clamps should be inspected whenever they are reused, no way they got in that condition consistently if inspected each time. Second, those clamps were severely over tightened and that’s not the clamps fault. An swab will take more abuse, but that does not justify, nor solve the issue with how they were installed. You should tighten clamps to a good tension, then come back after they have taken a set and snug them up later without over torquing them. A broken worm is an installers fault, not a mfg defect. Over tensioned clamps that bend and show signs of Sticking have already failed and should be discarded immediately instead of just tightened with a bigger screwdriver.
We always had to watch for the non stainless screw, but even if you did get one, they should last a long time and get caught in an annual inspection .
Practice good clamp hygiene and you should easily get by without an entire boat of expensive clamps. It’s a luxury, not a necessity. JMHO because somebody might think that upgrading their clamps solves installer failures and that’s not really an optimized solution.
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05-15-2019, 04:09 PM
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#7
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Guru
City: Fort Myers, FL... Summers in the Great Lakes
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 12,835
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Not all perforated clamps are equal.
On some models, the area to either side of the perforation can be significantly wider (making the whole clamp significantly wider. These can obviously have a great deal more strength.
While I do like the non perforated clamps, there are junky ones of those also. Most commonly they lose the edge on the screw threads and release tension.
On the highly critical stuff I prefer the T bolt clamps, but they are pricey.
As we now live in the era of Chinese junk and knockoffs, I inspect all clamps before installing.
Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
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05-15-2019, 05:58 PM
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#8
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TF Site Team
City: Seneca Lake NY
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 7,828
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Quote:
Originally Posted by GFC
Being the non-mekanyik sort of guy that I am, and being familiar with only the type of clamp shown in the photos above, what else is there? Help this poor, stoopid guy out, will ya?
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Mike
CMS - a commercial member here on TF provides some excellent info & articles - here's his article on hose clamps...
https://marinehowto.com/proper-insta...e-hose-clamps/
__________________
Don
2008 MS 34 HT Trawler
"Bacchus"
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05-15-2019, 06:01 PM
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#9
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TF Site Team
City: Saltspring Island
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 5,663
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Quote:
Originally Posted by GFC
Being the non-mekanyik sort of guy that I am, and being familiar with only the type of clamp shown in the photos above, what else is there? Help this poor, stoopid guy out, will ya?
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Hey Mike. Not stoopid, at least I am with you if you are. I avoid the ones that are stamped "All Stainless" and have a zinc plated screw that lasts one year.
Otherwise mine are mostly the worm screw kind.
There are T type clamps on the hose to exhaust elbow connection, but I don't recall any other Ts on my boat.
__________________
Keith
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05-15-2019, 07:43 PM
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#10
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Guru
City: Tri Cities, WA
Join Date: Nov 2012
Posts: 4,406
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Who says old guys can't be edjumicated! I've used those AWAB clamps in the past and didn't even realize I was doing something right. Whoodathunk.
__________________
Mike and Tina
1981 Boston Whaler 13'
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05-15-2019, 08:08 PM
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#11
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Veteran Member
City: Green Cove Springs
Join Date: Jan 2019
Posts: 83
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Even T Bolt clamps shouldn’t be the spot welded ones because they corrode and fail around the weld, that’s why I don’t use them, plus on a lot of fittings you can’t get two on because of their width. I use the spring ones on heat affected hoses on the engine to retain the tension.
I have been thinking of what to do with all the clamps I have removed and I reckon the poster who is most in denial can have them as long as they promise to use them on all their sea cocks.
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05-15-2019, 08:30 PM
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#12
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Guru
City: Jacksonville
Vessel Name: SONAS
Vessel Model: Grand Alaskan 53
Join Date: May 2014
Posts: 7,235
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They are stain-less.
Not stain proof.
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05-16-2019, 04:45 PM
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#13
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Guru
City: Brookline, NH
Vessel Name: Shalloway
Vessel Model: Defever 44, twin Perkins
Join Date: Sep 2013
Posts: 2,260
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Quote:
Originally Posted by PaulGel
I have been thinking of what to do with all the clamps I have removed and I reckon the poster who is most in denial can have them as long as they promise to use them on all their sea cocks.
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That's an awesome idea!
Like you I went through my entire boat and replaced almost all clamps with Awab. I found only a few truly questionable clamps, but what I did find that was pretty bad was EVERY near or below waterline connection had been double clamped (obviously after the fact since the clamps were different) including many places where double clamps did not fit over the hose barb! This is a major problem because not only does this not increase the security, but the clamp can actually damage the hose and help it to creep off the hose barb.
Ken
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05-16-2019, 06:18 PM
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#14
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Guru
City: Queensland
Vessel Model: Milkraft 60 converted timber prawn trawler
Join Date: Jul 2016
Posts: 5,482
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Quote:
Originally Posted by O C Diver
On the highly critical stuff I prefer the T bolt clamps, but they are pricey.
As we now live in the era of Chinese junk and knockoffs, I inspect all clamps before installing.
Ted
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I have had "Trident" T bolt clamps break at the 3 small spotwelds.
I have replaced with cheap Chinese T bolt copies as they appeared same same but had 4 spots where Trident had 3.
Working on the principle that because they are cheaper I can carry plenty of spares
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05-17-2019, 07:00 AM
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#15
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Guru
City: Reedville, VA
Vessel Name: Wingspan
Vessel Model: Aluminum Catamaran
Join Date: Aug 2018
Posts: 580
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Quote:
Originally Posted by GFC
I've used those AWAB clamps in the past and didn't even realize I was doing something right. Whoodathunk.
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There's an old saying in Special Forces - Sometimes it's better to be lucky than good.
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05-18-2019, 08:50 PM
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#16
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Veteran Member
City: Green Cove Springs
Join Date: Jan 2019
Posts: 83
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Apparently you can get T Bolts with folded hooks rather than spot welds and that solves the problem but I have never managed to source them. If anyone has a brand I would appreciate the info. Thanks
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05-18-2019, 09:28 PM
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#17
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,191
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Steve D has referred to them but I haven’t seen them for sale either.
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05-18-2019, 10:21 PM
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#18
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Guru
City: Phoenix, AZ
Vessel Name: Enigma
Vessel Model: 1997 Wellcraft Excel 26 SE
Join Date: Mar 2015
Posts: 658
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There are different grades of stainless.
https://blog.mchoneind.com/blog/stai...l-grades-chart
I suspect the failed "all stainless" clamps are 303.
__________________
>>>>>>>>>>>Action
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05-19-2019, 08:31 AM
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#19
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Guru
City: Queensland
Vessel Model: Milkraft 60 converted timber prawn trawler
Join Date: Jul 2016
Posts: 5,482
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Quote:
Originally Posted by Simi 60
I have had "Trident" T bolt clamps break at the 3 small spotwelds.
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Had another tridon fail on me today.
Bloody expensive clamps to fail like this.
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05-19-2019, 07:40 PM
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#20
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Guru
City: Gooding ID/Wrangell AK
Vessel Name: Silver Bay
Vessel Model: Nordic Tug 42-002
Join Date: Sep 2012
Posts: 1,040
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I had an AWAB hose clamp just fail on raw water hose. It started leaking and couldn't be tightened or loosened. The screw had basically seized. Went to NAPA in Ketchikan and they sold me a T-bolt clamp with 4 bent tabs per side. The brand is NORMA and this specific model is ND57 W5. Nice clamp but expensive.
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