Achieve the Proper Tightness: Tighten the clamp until it forms a secure seal, ensuring no leakage when the system is under pressure. For worm drive clamps, stop tightening once you feel resistance and observe a small gap of approximately 2 millimetres between the band's ends.
These constant-torque clamps, found in sizes from 9/16" to 3 ¾", should be tightened to 30-45 in. lbs.
Too much tightening will cut a soft-material hose and worsen a leak.
Most full size solid band hose clamps call for 30-40 inch pounds of torque, which is easily achieved using a screw driver or proprietary hose clamp installation tool. A mini-torque wrench being used to ensure proper hose clamp tension.
For best results, torque to the low end of the torque range. If it leaks, tighten it until the leak stops (without exceeding the max torque). Lightly lubricate the threads and sealing surfaces with oil before assembly.
Tighten the clamp until it forms a secure seal, ensuring no leakage when the system is under pressure. For worm drive clamps, stop tightening once you feel resistance and observe a small gap of approximately 2 millimetres between the band's ends.
In pneumatic systems where air pressure is crucial for operations, hose clamps play a vital role in keeping hoses secure and airtight.
Torque – An Explanation
Torque, as it relates to fasteners, is the twisting force required to spin a nut along the thread of a bolt. The basic formula for torque is T= (KDP)/12, where T= Torque in Foot Pounds, D= Nominal Diameter in Inches, P= Desire Clamp Load or Tension in Pounds, and K= Coefficient of Friction.
Mark the surface of the fastener after tightening the bolt or nut, and continue that mark to the surface that it's being fastened to. Now loosen the fastener, wait a moment, and re-tighten until the marks you just made align. The torque required to get to that point is a good reference to the original torque used.
BREEZE Constant-Torque Clamp
The spring automatically increases or decreases the clamp diameter in relation to variations in operational or environmental temperatures, ensuring tension upon application.
Over time, hose clamps may experience some loosening due to factors like vibrations or thermal expansion.
Increasing the application torque beyond the specified limit may lead to permanent deformation of the clamp or hose & seizing/jamming of the clamp.
Hose clamps can damage hoses over time due to several factors. First, if clamps are over-tightened, they can create pressure points that lead to cracks and tears in the hose material. Second, corroded or worn clamps can cause uneven wear, resulting in weak spots along the hose.
General Instructions for the use of Tubular Fittings. All grub screws must be tightened to a torque of 39Nm. Always ensure that the pointed, cutting end of the grub screw is placed against the tube and that the flat end points away from the tube.
One myth is that all thru-hulls should have two clamps. This is untrue. American Boat & Yacht Council (ABYC) standards only recommend two clamps for exhausts and fuel fill systems. That said, you can use two clamps to secure any hose if there is enough space on the fitting so the second clamp won't crush or cut it.
The clamp should be placed at least 6 inches from the coupling when using a hose clamp to ensure effective seal and to prevent any potential leaks or damages.
The smaller the fitting the easier it is to overtighten. Finger tighten is tightening with finger only, no tools, to a torque of about 1.2 to 1.7 foot-pounds (1.7 to 2.3Nm). Do not overtighten joints by giving one more turn just to be sure.
Determining Torque
The general equation for bolt load based on applied torque is T = KFiDb where K = torque coefficient. K is a function of the coefficients of friction and collar friction in the joint, and these are based on variables such as surface finish, coatings, and so on.
The Force Torque Method
One of the most common forms of determining preload in a bolted joint is using a specially designed force-torque sensor. By attaching the sensor to a torque wrench, you can measure the amount of needed force to loosen or tighten the bolt, resulting in a reading of clamp load values.
Proper torque is the twisting force required to accurately apply the desired clamping force, working within the limitations of the fastener and the materials to be fastened.
Use a Torque Wrench: A torque wrench is an essential tool for achieving precise torque. It allows you to apply the force with accuracy, ensuring that you neither under-tighten nor over-tighten the fastener.
One of the strongest hose clamps on the market, the t-bolt clamp offers a wide band that provides 360° coverage.
Hose-clamp names include hose clips and jubilee clips – some people even call them jubilee clamps. “Jubilee” is actually an example of a brand name that has become synonymous with a type of product, in this case a style of hose clamp.