These pipe clamps have a ductile cast iron casing, with an EPDM or NBR rubber seal gasket. The clamps are tested to 1600kPa pressure for all sizes. These clamps have an OD tolerance of -6mm to +10mm. The seal of the clamp works by using a progressive lip seal system, which uses internal fluid pressure to help the sealing effect.

Measure the width of the clamp, and mark the length with a permanent marker and tape measure onto the pipe, and an equal distance from the centre of the crack or hole. This will remind you once the clamp is wrapped around the pipe, exactly where to line it up to ensuring the best effect on sealing the hole or crack. When installing this clamp, ensure the correct outside diameter has been measured, clean the surface of the pipe all over the area where the clamp will be fitted. 

The vent plug should be removed before installing the clamp, as this allows the fluid to be vented out whilst installation is taking place. The vent plug should be the very last part to be fitted and tightened during the installation process.  Start by tightening the middle nuts and bolts first, ending with the outer nuts and bolts. Fasten the nuts and bolts to the required torque mentioned on the clamp itself.

Finally, after 30 minutes of the clamp being in use, check the tightness again with your torque wrench.