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.
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Ductile cast iron pipe is a pipe type preferred in main transmission lines since it has superior properties such as corrosion strength and abrasion resistance as it is made of cast iron, as well as being able to stretch without deformation. In regions where the temperature is low, freezing frequently occurs on the main transmission lines, especially in winter. Such problems can be avoided by using pre-insulated ductile iron pipes.
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The steel pipes used in the manufacturing of pre-insulated pipes are manufactured longitudinally welded (ERW) or spirally welded (SAW) in accordance with the norms required by the standard TS EN 253 or customer demands. Pipes comprise three basic materials. Carrier pipes are established as steel, copper or plastic based according to the properties of the carried fluids. Casing pipes are manufactured from high density polyethylene (HDPE) raw material, with UV resistance, 100% waterproof and with online corona. PUR ( POLYURETHANE INSULATION MATERIAL) that is injected between the carrier pipe and casing pipe provides heat insulation besides enabling two pipes operating as one pipe by bonding them together.
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Pre-insulated stainless steel pipes have higher corrosion resistance and oxidation strength compared to other steel pipes. It has a wide range of use such as the food and dairy industry, maritime industry and chemical industry. The preservation of heat in the lines used in these fields is provided by pre-insulated stainless steel pipes.
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The maximum temperature strength of standard type pre-insulated pipes is 140 °C. For this reason, rock wool reinforced (industrial type) pre-insulated seamless steel pipes must be used in lines that are required to operate at higher temperatures such as hot water, hot oil and steam lines.
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