The pipe is used in systems for drinking and household-drinking purposes, hot water supply, water heating, systems of water heated floors and walls, soil heating, as well as process pipelines transporting liquids that are not aggressive to pipe materials. The main area of application is the systems of underfloor heating and walls (for articles - PE.320.04, PE.350.04, PE.320.05, RE.220.04, RE.230.04, RE.250.04 and RE.220.05); the rest - for water supply and heating systems. PEX-a MVI cross-linked polyethylene pipes can be used for 1, 2, 4, 5, XB - operating classes.
Installation of pipes should be carried out at an ambient temperature of at least 5 ° C with a specially designed tool. It is forbidden to use a pipe with flattening and kinks, etc. In case of “kinking”, the damaged section of the pipe must be removed. It is allowed to warm up the broken section with a construction hairdryer until it restores its original shape (shape memory effect). However, in this case, the design pressure of the working medium must be reduced by 25%. Coils of pipes stored or transported at temperatures below 0 ° C must be kept for 24 hours before rolling at a temperature of at least 10°C. The free ends of the pipes must be closed with plugs to prevent dirt and debris from entering the pipe. When bending a pipe with a radius close to the limiting one (5Dnar), it is recommended to preheat the pipe to a temperature of 130 ° C with a construction hair dryer.
In order to avoid straightening of the bent pipe section during heating, in the places where the pipe is turned, it should be fastened with clamps or brackets with a step of 10 cm. The underfloor heating pipeline should be poured with concrete or covered with a coating only after hydraulic tests for tightness. The PEX-a MVI pipe must be at a pressure of 0.3 MPa when pouring; The minimum height of the solution pouring above the pipe surface must be at least 3 cm. The arrangement of fixed supports on the pipeline should be designed in strict accordance with the instructions of SP 41-102-98. Mechanical damage to the EVOH layer increases the oxygen permeability of the pipeline. Protect the pipe from direct sunlight.