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Created on 09.11
Hose Clamp Installation & Technical Guide
Even for the most experienced fitters, it is always beneficial to review the installation process to ensure that products are being used correctly and safely. In this guide, we provide detailed information on key technical issues related to hose clamping, helping you diagnose and resolve any problems you may encounter.
Pipe Fittings & Hose Clamp Design Considerations
An effective clamping solution depends on the combined performance of both the hose clamp and the pipe fitting. To achieve optimal sealing performance, the following points must be carefully considered before fitting the clamp:
- Barbed profiles generally provide the best sealing performance; however, they are not suitable for thin-walled or low-pressure applications;
- Pipe fitting sizing is critical — the fitting should be sized so that the hose stretches slightly over it. An oversize fitting will be difficult to seal properly, while an undersize fitting may loosen too easily or cause the hose to bunch up;
- Structural strength — Pipe fittings must have sufficient strength to withstand the compressive force exerted by the clamp. Heavy-duty clamps should only be selected when both the hose and the pipe are made of strong and resilient materials.
Axial Thrust: How Diameter Affects Clamping Requirements
The build-up of internal pressure within a hose generates axial thrust, which tends to push the hose off the end of the pipe fitting. One of the primary functions of a hose clamp is to resist this axial thrust and retain the hose securely in place.
The level of axial thrust is determined by two factors:
- The internal pressure generated within the hose;
- The square of the hose's internal diameter.
To illustrate: the axial thrust on a hose with a 200mm internal diameter is 100 times greater than that on a hose with a 20mm internal diameter — assuming equal internal pressure.
For this reason, we strongly recommend heavy-duty hose clamps for large-diameter hoses operating under significant pressure. Without adequate clamping force, the hose will not remain securely in place.
Achieving the Correct Tensioning
It is essential to tighten every clamp to the correct torque specification to achieve optimal performance. For all bolt-type, screw-type, and worm drive clamps, we provide a maximum recommended torque value.
While it is true that a higher input torque produces a higher clamping force for a given clamp, this figure must not be used to compare the relative strength of different clamps. Other critical factors — such as the screw thread design, band width, and band material — also play a significant role in determining overall clamping performance.
Correct Hose Clamp Positioning
When a hose clamp is tightened, it compresses the hose, resulting in localized deformation. This compression effect makes it critical that the clamp is not positioned too close to the end of the hose, as there is a risk of:
- Leakage due to insufficient material engagement;
- The clamp slipping off when the system is pressurized.
We recommend that every clamp be positioned at least 4mm from the end of the hose, as illustrated in the diagram below, to ensure a secure and reliable seal under all operating conditions.
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