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Old 07-16-2016, 07:55 AM   #1
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Hose clamps,worm clamps???

I had installed a Fernco Coupling to repair a black tank leak. Well, to my surprise I found the tank leaking again. Before I tore it all apart something said to tighten the worm clamps on the Fernco coupling. Sure enough, they came loose. Question is, who makes the best hose or worm clamp that most likely won't come loose? Is there another way to keep these clamps tight? I did use the Fernco torque wrench to tighten them to 60 pounds, that was supposed to keep them leak tight.

Thanks for the info.
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Old 07-16-2016, 10:53 AM   #2
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The rubber collapses over time, allowing slack in the clamp. Add to that vibration of the moving RV and the conditions are right for clamps loosening. You could try a dab of Threadlocker on the threads of the clamp, it might help. Best is to just periodically re-torque the clamps.
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Old 07-16-2016, 10:54 AM   #3
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In automotive usage, the worm clamps would always "appear" to loosen over time , mostly due to shrinkage,and squeezing out from under the clamp, of the rubber , rather than the screw backing off . Then automotive manufacturers switched over to , spring tension clamps to avoid the leak issues.
It may take a few re-torques of the screw clamp but you will get to a point where the rubber no longer compresses out from under the clamp.
EDIT: And once again Bob , types faster than I do.
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Old 07-16-2016, 11:17 PM   #4
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This is what I use on my hoses. They never come lose because of the belleville washers. Not cheap and have to order them by correct ID range. Standard worm gear clamps come lose once the hose sets from heating and cooling cycles.

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Old 07-17-2016, 05:40 AM   #5
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Get constant tension clamps. Use a spring so that as the hose shrinks, the tension remains the same. Cost more, but worth it.
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Old 07-17-2016, 06:16 AM   #6
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Worm drive clamps, by design, don't back off.
What happens is, while tightening, the clamp tends to bunch up the rubber near the screw. Over time the rubber evens out and the clamping force lessens.

You don't need to buy expensive clamps, especially for sewer hoses, you just need to go back over the clamps after a few days.

If it is something critical or difficult to reach, try tapping the side of the clamp, opposite the screw, while tightening.
You could also put some soap on the hose, under the band, so it slides, rather than bunch.
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Old 07-17-2016, 08:05 PM   #7
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Quote:
Originally Posted by chboone View Post
This is what I use on my hoses. They never come lose because of the belleville washers. Not cheap and have to order them by correct ID range. Standard worm gear clamps come lose once the hose sets from heating and cooling cycles.

McMaster-Carr
Thanks for the link, will look into them.
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Old 07-17-2016, 10:33 PM   #8
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For a lower cost you could also use worm gear clamp with a liner to prevent the soft rubber getting caught in the slots of a standard clamp.

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