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Pre-insulated pipes are incresingly popular for centralised and energy efficient district heating and cooling systems. Â A central service pipe is surrounded by PUR foam insulation and a durable HDPE outer cladding. Adding an EVALâ„¢ layer to the pipe structure helps extend system service life, by maintaining insulation efficiency and structural integrity. Â EVALâ„¢ helps make sure pre-insulated pipe systems performs not only longer, but more efficiently as well.

Floor heating systems made of heating pipes of polybutene (PB), polypropylene (PP) or cross-linked polyethylene (PEX) can cause potential corrosion of the metal parts in the heating element due to the oxygen that easily permeates through the plastic pipes. To avoid this corrosion several options can be taken: using corrosion resistant material adding rust-preventive agents into the water reducing the oxygen permeability of the pipe. Reducing the oxygen permeability of the pipes is the most secure and economical solution. By using a multilayer pipe made of plastic containing an EVALâ„¢ barrier layer, the oxygen transmission rate will be reduced to a minimum and the corrosion of the metal parts in the heating system is minimised. The gas barrier property of the EVALâ„¢ resins prevents oxygen from permeating through the wall of the pipe and subsequently dissolving into the circulating hot water, thereby corroding metal parts in the heating element. Plastic pipes coated with an EVALâ„¢ l

Floor heating systems made of heating pipes of polybutene (PB), polypropylene (PP) or cross-linked polyethylene (PEX) can cause potential corrosion of the metal parts in the heating element due to the oxygen that easily permeates through the plastic pipes and into the heating circuit. To avoid this corrosion several options can be taken: using corrosion resistant material adding rust-preventive agents into the water reducing the oxygen permeability of the pipe. Reducing the oxygen permeability of the pipes is the most secure and economical solution. By using a multilayer pipe made of plastic containing an EVALâ„¢ barrier layer, the oxygen transmission rate will be reduced to a minimum and the corrosion of the metal parts in the heating system is minimised. The gas barrier property of the EVALâ„¢ resins prevents oxygen from permeating through the wall of the pipe and subsequently dissolving into the circulating hot water, thereby corroding metal parts in the heating element. Plastic

Many pre-insulated pipes use rigid polyurethane foam and a HDPE casing. Over time, the insulation efficiency of the pipe structure decreases, caused by the permeation of air (oxygen, nitrogen) into the foam cells and the diffusion of cell gases (blowing agent, carbondioxide) out of the foam cells. The insulation efficiency of PUR foam decreases as air permeates in and cell gasses permeate out of the pipe structure, increasing thermal conductivity. Oxygen permeation can also lead to oxidative degradation of the PUR-foam insulation itself. This reduces the adhesion between the PUR-foam and inner pipe, weakening the structure and compromising the mechanical integrity of the entire pipe system.