Chemical Piping Support - Helpful Tools and Resources
Tech Notes - CJ Compression Joints
- A smooth and square pipe end is required. All pipe is to be used with Compression Joint (CJ). Pipe must be cut with a pipe cutter, having a plastic cutting blade. Pipe end must be cylindrical/cut square to form a proper joint.
- It is not normally necessary to disassemble the CJ joint to insert the pipe. The stainless steel (SS) ring should be centred in the fitting and held in position by the nut and seal, it should not be tight. You should then be able to insert the pipe into the joint until it is against the pipe stop. Tighten the nut by hand and you are finished. If you are unable to insert the pipe, do not try to force the pipe into the joint as you may distort the SS steel ring. Instead disassemble the joint, slip the nut, flat side first onto the pipe, then the SS steel ring (about 1/2" max. Onto the pipe). (Ensure that ring and seal are properly orientated with the taper away from the nut). Then slip the PE seal onto the pipe, and insert the pipe into the fitting body (pushing back the seal and ring) until it reaches the pipe stop. Screw the nut onto the thread and hand tighten, making sure that joint is not cross threaded and that pipe is still against the pipe stop.
- Hand tightening is usually sufficient to seal and lock the CJ joints. If necessary, you may tighten the joint with two wrenches, preferably with a square jaw to engage with the nut and the flats on the fitting body. Do not apply excessive force. Test joint using water at 15 psi (maximum). If a leak occurs, check pipe is against the pipe stop, then retighten. If leak has not stopped, disassemble the joint to determine if the joint (especially SS ring and seal) was assembled correctly or if there are gouges in the pipe, seal or fitting body. Re-place any damaged parts, reassemble, tighten and retest.
- READ and FOLLOW the INSTRUCTIONS CAREFULLY to achieve optimum results.
- 30 minutes after initial tightening/assembly and before testing, the nut should be checked and retightened. This will increase the pull out capability of the unit considerably, after the SS ring edges have begun to bite into the outer surface of the pipe.
- If you anticipate that joints may require removal and rejoining, we suggest that extra SS rings be purchased. The SS rings can not normally be removed without distortion. The rings can be cut and removed easily. Do not use a ring that has been cut or distorted.
- The SS rings have sharp edges. BE CAREFUL handling them.
- Do not test with compressed air or gas, severe damage or bodily injury can result.
WE RECOMMEND TESTING USING WATER PRESSURE