When laying pipe heating and hot water (DHW) to replace steel pipes are increasingly coming to the pu insulated pipes (pipes PUF), possessing over traditional steel pipes many advantages. Firstly, why, and began in his time developing pur insulation – hot-polyurethane, which are covered with polyurethane foam tubes, 2 times lower thermal conductivity of mineral wool, which is heat-insulated steel pipe when laying traditional steel pipe in a concrete channel. The thermal conductivity of mineral wool about 0,04 W / m , the thermal conductivity ppu 0.02 W / m . What does this mean? This suggests that if the thickness puf insulation in the pipes to do the same thickness as the thickness of mineral wool, such a pipe would save the energy used to heat the water passing through the pipeline, 2 times longer than traditional tubes. Across state is very big money.
Or, if the thickness of the pipe ppu to do 2 times thinner, then at the same insulation outer diameter of the pipe can be made much smaller. Correspondingly less need to choose the soil for trenching, and consequently – less and cost of the work of laying the pipeline, if this applied polyurethane foam tubes. But this is not important. The main thing is that due to higher heat resistance of new insulation fpu pipe can reduce heat loss in the passing on him of the liquid from 25-30% to 3-5%, equivalent to a decrease in fuel burn or electricity needed for heating in the amount of hundreds of millions of rubles. Following positive moment of such a pipeline – you can lay open (ductless) way. Pipes of steel pipes, insulated with mineral wool, must be laid in concrete channels, which protect the pipe and insulation from the external environment (mainly water, with both high and low ph, the electromagnetic fields in conducting layers of soil, etc.). The creation of such a concrete channel to spend a lot of material and physical resources. The pipeline is made of pipes prp in such concrete channel is not needed.
Polyurethane foam insulation, located between the steel tube and a protective sheath made of polyethylene or metal, very tight as a tube, and to containment. Therefore, access of various substances, are always located in the ground (including dissolved) to the pipe and insulation is extremely difficult. Also in the pipes ppu held control wires, allowing remotely determine the starting point of metal corrosion or damage to the insulation. Term viability of foam big enough, theoretically, about 50 years. The real pipe prp has not been in the ground in During this period of time (as were used recently), so virtually confirm this date there is no way. However, the pipe that had lain in the earth about 15 years old and raised from the trenches determination to continue to perform their functions, have shown that the quality of foam remained virtually unchanged since their inception in the ground. This is another advantage of pipes prp compared with the steel – increasing the life of 2 times (so far only in theory, with a high probability of practical confirmation in the future).