Please observe common fitting instructions and practices below before fitting the repair clamp.
- Clean the pipe where the clamp is to be fitted.
- Position the clamp over the pipe so that the break is in the centre of the clamp.
- Put a witness mark on the pipe at each end of the clamp.
- Open the clamp by loosening the nuts to the end of the bolts (no need to remove the nuts).
- Wet pipe or apply an approved pipe lubricant suitable for potable water.
- Wrap the clamp around the pipe make sure the gasket does not fold, the gasket should fit smoothly around the pipe.
- Engage the washer plate/s behind the receiver plate/s.
- Position the ends of the clamp to line up with the witness marks you made to ensure that the break or hole/s are in the centre of the clamp.
- Hand tighten the bolts evenly. The studs and nuts have been metcoated to prevent gauling.
- Tension the nuts to a recommended torque of 135Nm.
- Re-tension the nuts to a recommended torque of 135Nm after the gasket has relaxed, at least 30min preferably longer. This step can be repeated as needed.
Off-take Clamps: Before Fitting
- Follow processes above to initially install clamp.
- The integrity of the sealing rubber must be tested prior to drilling the hole through the pipe and into the main.
- The clamp should be tested from the outside, using water pressure into the off-take area. This should be done to your desired pressure.
- Should the clamp leak during the test, the clamp can be re-tensioned as above as necessary.
- Once the clamp has proved its water tightness, the hole into the mains can be drilled.
Caution when fitting to poly pipe.
We manufacture a wide range of clamps, varying in diameter, length and styles for use on many types of pipe. Whilst many of the clamps we manufacture are used on poly pipe, caution should be used when using them on poly pipes.
With poly, consideration should be given to diameter, pressure, ovality, wall thickness, pipe surface quality, expansion and contaction, changes in pressure, strangulation of poly, amongst other factors. All these factors have a bearing on the performance of clamps on poly pipe.
Exact performance parameters cannot be given, as each installation is different. In our experience, the larger the pipe diameter, the less pressure that will be achieved when using the clamp.
As such, every installation is different, and we can give no guarantees for use with poly pipe and suggest extreme caution be used in installations that have poly pipe.
When using any clamp on any pipe, for optimum sealing pressure performance we suggest tightening the clamp onto the pipe then leaving the clamp for as long as possible, anywhere from a couple of hours to overnight, then retighten. This will allow the rubber mat to move to its most comfortable position and expel any compressed air in the mat sealing sections, before retightening. The tightening procedure can be repeated for maximum performance.
When offtake clamps are used, we suggest clamping the pipe as mentioned above and pressure testing the clamp from the outside, using the offtake. This should be done BEFORE drilling into the pipe, and not drilling into the poly pipe until fully satisfied.