Even if you are the most experienced fitter, there is nothing wrong with constantly summarizing and reviewing previous experiences so that you can be sure you are using the right product. In this guide, we provide information on technical issues related to clamps to help you diagnose and repair any problems that may exist.
Pipe fitting and hose clamp design:
Effective clamping schemes depend on hose clamps and fittings. In order to achieve the best sealing performance, the following points must be considered before installing the clamp:
1. barb type pipe joint is usually most suitable for sealing, but not suitable for thin-wall or low-pressure applications.
2. the size of the pipe connection should make the hose slightly extended in the pipe connection. If you choose a pipe joint that is too large it will be difficult to make it completely tight, but a pipe joint that is too small may easily loosen or make the hose squeeze together.
3,.in any case, the pipe connection should be strong enough to withstand the compression force of the clamp, and only when the hose and pipe are strong and elastic materials, choose heavy clamps.
Thrust: How diameter affects axial thrust:
The build-up of pressure in the hose creates an axial thrust force that forces the hose away from the tube joint. Therefore, one of the main uses of hose clamps is to resist axial thrust to hold the hose in place.
The axial thrust level is measured by the pressure generated in the hose and the square of the hose diameter. For example, the axial thrust of a hose with an inner diameter of 200mm is one hundred times that of a hose with an inner diameter of 20mm.
Therefore, we strongly recommend heavy-duty hose clamps for large diameter hoses with high pressure. Otherwise, your hose won’t last very long.
Correct tensioning
Any clamp must be tightened to the correct tension for correct performance. For the bolted worm drive type clamp, we provide the maximum torque value.
It goes without saying that for a given fixture, the greater the input torque, the greater the clamping force. However, this number cannot be used to compare the relative strength of the fixture; Because other factors such as thread and band width also play a role.
If you are still considering your options for different fixtures and clamps, we strongly recommend that you check out the brochure on our website to ensure that you meet our recommended tensioning for all ranges.
Locate hose clamps correctly
When the hose clamp is tightened, it squeezes the hose, causing compression. The resulting chain reaction will cause the hose to deform, so the clamp should not be placed too close to the hose end, as there is a risk of leakage or falling off when the clamp is placed under pressure.
When you choose a clamp, you are always worried about whether the material is corrosion resistant, so the environment in which the clamp is located is the most important consideration.
1. Working at high temperatures?
Generally, nylon 6.6 is the material we use for plastic clamps with a maximum operating temperature of 125°C (although glass-filled nylon 6.6 allows a maximum operating temperature of 150°C). For any application where the maximum temperature exceeds 150°C, metal clamps should be used.
2. Worried about weathering?
For most plastic hose clamps, exposure to ultraviolet (” UV “) radiation is the primary cause of degradation over time. HCL’s black plastic clips are rich in UV inhibitors and heat stabilizers, giving them a working life of more than 10 years.
In order to live longer, of course, the metal clamp is resistant to ultraviolet light and will last in hot and sunny conditions for more than 10 years.
Galvanized steel clips (W1-W2) are best for dry climates, but if humidity is a problem, you should choose stainless steel (W3-W5) to protect against rain.
3. What about chemicals?
Many fixtures are used in corrosive environments, especially in wet or saltwater conditions. In this case, plastic or W4/W5 steel clamps should be used.
For highly corrosive applications and maximum service life (25 + years) : Ultra-high grade materials must be used. This means nylon 11 or nylon 12 for plastic clips and titanium or high nickel/chromium alloys for steel clips.
4. Used for sterilization?
For medical Settings, fixtures are often disinfected before use. For clamps, this is a very aggressive harsh environment, and only certain materials are resistant, so you have to be careful to choose the right product.
Stainless steel is rated excellent for the following sanitizers and treatments:
Ethanol, electron beam, dry heat, formalin, isopropyl, alcohol
All of our hose clamps come in a variety of diameters, so choosing the right size is important. Even if you choose one, you’ll find it offers a range.
Here’s how to make sure you choose the right diameter hose clamp.
First: After the hose is slotted to the pipe connection, measure the outer diameter of the hose. At this point, the hose will almost certainly expand and it will be larger than before it was installed on the pipe.
Second:after measuring the outer diameter, check the dynamic range of the hose clamp to ensure that it can be tightened to the correct size. All of our clamps are provided with a minimum and maximum diameter, ideally you should choose clamps that fit the outside diameter of your hose to include the middle of this range. If you have to choose between two sizes, choose the smaller clamp, as it will compress the hose after it is placed in place.
If the middle range is not available, or the dynamic range of the hose clamp you are considering is narrow, we recommend that you order a sample of the closest size (you can order any clamp on our website) and then test it before ordering the full quantity.
