Pipe Outer Diameter
Insulation Thickness in Pipes
Radial and axal expansion of the pipe assembled outdoors should not be prevented. To obtain good results fixed supports should be chosen in such way that they do not damage the outer surface of the pipe.
Fixed supports are used to fix the pipe at a certain points against undesired pipe movements. Fixed supports should be stronger compored to the sliding supports. Fittings are used to construct fixed supports. At the points where direction changes fixed supports should not be used. The distance between the fixed supports should be chosen in such a way that pipe thermal expansion is not affected.
For instulated pp-r installed outdoor, thermal expansion should be calculated within the planperiod.
Welding principles of pp-r pipes and fittings
Preparation of the welding machine
1-Welding machine is heated up to 260°C. When the control light goes off at 260°C welding process can be started. Pipe should be cut to the appropriated length perpendicular to the pipe axis. Welding distance should be marked from the pipe.
2-Welding surfaces of pipes and fittings ahould be clean. If necassery welding surfaces should be cleaned with alcohol and dired with a dry cloth. During welding neither the pipe nor the fittings should be moved.
3- Pipes and fittings should be heated. When the heating process ends they should be taken ouit quickly and joined by pressing one to another axially without twisting. Welding machine should be cleaned after every operation for the next use.