Clamps need regular checkup, especially those on the ship. The recommended interval is at least 1-2 times per quarter, to make sure that the clamps are still in good condition. Follow the guideline below:
How Many Hose Clamps Is Needed?
The number of clamps needed depends on the purpose of use and required safety level. On shipboard usage, for example, 2 clamps with half an inch space in between is recommended for safety purpose, as at least one clamp will be able to hold the hose if the other clamp is broken.
Some users may use up to 4 clamps. This is not recommended as it adds an extra cost and consumes extra installation time. Moreover, more equipment means more maintenance. In this case, consider changing the type of clamp and use only 1-2 clamps. The important note is to fasten the clamps on opposite directions, the first facing north, the other facing south, for example. As each type of clamps distribute tension unevenly, opposite installation would help balance the tension.
Hose Connector matters
Choosing the right Hose Connector (Hose Barb) for the job directly affects the efficiency of hose clamp. “ORBIT” has these 3 suggestions:
Hose Clamp: the tighter, the riskier?
Myth has it that the tighter we fasten a hose clamps, the better. When in fact, overtightening can ruin both rubber hose and clamp, not to mention higher chance of leakage. Therefore, for safety factor of hose and clamp, most OEM parts would have constants (Nm) for clamp fastening. These constants vary according to size and usage.
A user once contacted us with the problem of leakage when connecting plastic pipe to rubber hose. After an investigation, we found out that clamps was overtightened, causing the plastic pipe to misshape. In that case, the user had to change the whole unit, resulting in unnecessary extra cost.
Normally, the relation of torque and tightness is in direct variation, meaning the more we screw the clamp, the tighter it becomes. However, at some point this relation between the input (torque) and output (tightness) stops being in direct variation. The excess torque would then result in the damage of clamp, hose, or pipe instead, as overtightening violates the safety factor of clamps.
When installing clamps, torque meter is usually needed to make sure the torque matches the guideline given for each clamp. Nevertheless, the following technique is applicable in the lack of torque meter. It is to screw clamps just until hose is slightly sink to the same level as clamps. Stop screwing when the surface is smooth. Do NOT overtighten!