When making hot melt connection of PPR pipe fittings, the following safety matters need to be paid attention to:
Check the material:
Before hot melting, check the pipe and pipe fittings for damage. In the process of transportation in low temperature environment, PPR pipe wall bump may produce scoring effect.
Temperature control:
After the hot melt machine is powered on, it is necessary to let the hot melt tool reach the specified temperature. For example, the temperature of PPR should be set at 260 ° C ±5 ° C. If the working environment temperature is below 5 ° C, the heating time needs to be extended by 5%. Before each hot melt pipe, it is necessary to determine whether the surface temperature of the welding head on the hot melt device meets the requirements. When the temperature deviation exceeds ±10%, the work should be stopped immediately for inspection, and the operation can be carried out after the return to normal.
Clean and dry:
Before the hot melt connection, it is necessary to clean and wipe the welding surface of the pipe and pipe fittings to keep it dry and free of oil. If the inner wall has water beads, it will produce bubbles during welding, and there is a hidden danger of virtual welding.
Incision treatment: Use special scissors to cut the pipe vertically to ensure that the incision is clean, smooth and without burrs. If the incision is skewed, then the pipe and pipe fittings can not be in a straight line when welding, and the PPR pipe after welding will appear skewed, which is easy to shorten the service life of the joint.
Operation specification:
In the process of hot melt connection construction, we must use a reliable hot melt machine, so as to ensure the quality of hot melt connection. Do not turn the pipe randomly during welding, and adjust the position of the joint within a few seconds after the pipe and welding head are welded, but the strength is not large. After the specified cooling time, it is strictly prohibited to force correction or let the just-processed joint bear external force.
Moderate force:
When using PPR pipe fittings with metal threads, the white raw material belt must be firmly sealed to avoid leakage from the thread. Excessive tightening of the PPR pipe with metal thread may crack the pipe and lead to water leakage, should pay attention to moderate force.
Fixing method:
To use a professional pipe card to fix the PPR pipe, do not use hooks to prevent damage to the water pipe and reduce the life of the water pipe. The cold water pipe clamp spacing is usually 50±5cm, and the hot water pipe clamp spacing is 35±5cm.
Pipe layout:
the direction of the water pipe should be horizontal and vertical (on the premise that the slot is horizontal and vertical), to avoid hard pulling or twisting the water pipe, resulting in the water outlet is not parallel to the wall, affecting the installation of beautiful and mixed taps.
Following these safety considerations ensures the quality and safety of the hot melt connection of PPR pipe fittings.turkish PPR