worm gear hose clamp pressure limitations.
worm gear hose clamp pressure limitations.
(OP)
Not much luck with Google.
Some of the name brand ones kind of dump it off against hose rating limitations.
In the smaller sizes I've seen signs of very uneven clamping.
I'm sure barv design etc enter into it too.
Before I go searching for MIL specs I figure I'd ask here.
thanks
Dan T
Some of the name brand ones kind of dump it off against hose rating limitations.
In the smaller sizes I've seen signs of very uneven clamping.
I'm sure barv design etc enter into it too.
Before I go searching for MIL specs I figure I'd ask here.
thanks
Dan T





RE: worm gear hose clamp pressure limitations.
Here's an MS spec for this type of hose clamp, but it does not give pressure ratings.
RE: worm gear hose clamp pressure limitations.
"It's not always a case of learning more, but often of forgetting less"
RE: worm gear hose clamp pressure limitations.
The nut torque is also typically limited to 50 in-lb or less for the typical 1/4-28 t-bolt thread regardless of clamp size because even a lined clamp is capable of cutting even reinforced hose and/or distorting the underlying tube, given the mechanical advantage provided by the t-bolt thread.
In the marine exhaust trade, similar clamps are used on hot/wet/gas and water lines at pressures that rarely go above 25 psig, but they are always doubled (two adjacent with 1/2" between), and usually tripled for hoses much fatter than your arm.
Presence of a 'hose bead' on the tube is also pretty much mandatory, unless some other means is provided to prevent the hose from oozing off the tube end under pressure.
When you get to ~100 psig, you generally need a hose bead and a full circle crimped ferrule.
... Okay, it used to be common to see R12 systems with hose clamps, but the tubes had multiple barbs or multiple beads, and you had to be careful not to overtorque the clamps. ... and ~nobody does it that way anymore; full crimps and quick-connects are faster and more reliable and less skill-sensitive.
Mike Halloran
Pembroke Pines, FL, USA
RE: worm gear hose clamp pressure limitations.
I dug out an old copy of the SAE Handbook Vol. 2 I have. Attached is the relevant section regarding screw installation torque for various types of worm gear hose clamp. There is no specific pressure rating provided. There is only a comment stating that "adequate sealing capability" should be reached at the installation torques listed. This would seem to indicate the pressure limit is based on the hose capability. As others noted there are other types of hose clamps, such as toggle bolt band clamps, that work better at higher pressures.
Hope that helps.
Terry
RE: worm gear hose clamp pressure limitations.
The SAE recommendation NOT to use an impact wrench for tightening was especially helpful in my case.
Dan T
RE: worm gear hose clamp pressure limitations.
Engineering is the art of creating things you need, from things you can get.