(1) working steel pipe: according to the technical requirements of conveying medium, slotted steel pipe, seamless steel pipe and spiral welded steel pipe with double-sided submerged arc welding are adopted respectively.
(2) Insulation layer: rigid polyurethane foam is used.
(3) Protective shell: 1 high density polyethylene or glass fiber reinforced plastic is used.
(4) Leakage alarm line: When manufacturing oil pipeline insulation, an alarm line is buried in the insulation layer near the steel pipe. Once a certain part of the pipeline leaks, through the conduction of the alarm line, an alarm can be given on the special detection table, and the exact location and degree of the leakage can be displayed, so as to inform the maintenance personnel to deal with the leaking pipe section quickly and ensure the safe operation of the heating network.
What are the insulation materials for pipes?
1, glass wool
Glass wool has the characteristics of good formability, low bulk density and low thermal conductivity, and has extremely high corrosion resistance and good chemical properties in chemical corrosive environment. The adaptive characteristics of glass wool are aimed at the insulation of air conditioners, exhaust pipes, boilers and steam pipes.
2. Composite silicate
Composite silicate has the advantages of low thermal conductivity, excellent thermal insulation and low bulk density at high temperature. Compared with other pipe insulation materials, the construction method of composite silicate is more convenient, which has no stimulation and pollution to employees and no harm to human body. Can be cut at will, transportation is relatively safe and reliable, and the loss is low. Composite silicate has been widely used in China's petrochemical industry, electrical industry, metallurgical industry and some national defense undertakings, and is used for thermal insulation of various storage tanks and pipelines, so composite silicate is considered as an ideal energy-saving material.
3. Polyurethane
Polyurethane is mostly used to make cold storage, refrigerated trucks or fresh-keeping boxes, and can also be used as the insulation layer of color steel sandwich panels. Polyurethane is sometimes used in petrochemical storage tanks. Polyurethane also has the function of heat preservation and cold preservation, and has been applied in petrochemical and metallurgical fields, especially in the outer layer protection of buried pipelines.
4. rock wool tube
Rock wool tube is mostly used for thermal insulation of boilers or equipment pipelines in petrochemical, metallurgical, shipbuilding, textile and other industries, and sometimes it is also widely used for partition walls in construction industries, such as indoor ceiling and wall thermal insulation. In power, petrochemical, light industry and other industries, all kinds of pipeline insulation measures are adopted, especially for pipelines with small openings, which can be implemented quickly. Waterproof rock wool tube has special properties, such as moisture-proof, hydrophobic and temperature-discharging, and is suitable for use in rainy environment. It is water repellent.
New pipeline thermal insulation material
The insulation pipe is composed of steel pipe, glass fiber reinforced plastic inner sheath and glass fiber reinforced plastic outer shell, and is characterized by also comprising a high-temperature resistant insulation layer, a lubricating layer and an elastic sealing element. The utility model effectively solves the problems of heat preservation, sliding lubrication and waterproof of the exposed pipe end of the prefabricated directly buried heat preservation pipe for high-temperature heat transfer at130-600 DEG C in urban central heating.
Thermal insulation pipelines are widely used in liquid and gas transmission pipelines, chemical pipeline thermal insulation engineering, petroleum, chemical industry, central heating and heating pipe network, central air conditioning ventilation pipelines, municipal engineering and so on. Oil pipeline thermal insulation is a kind of directly buried prefabricated thermal insulation pipe with good thermal insulation performance, safe and reliable heating and low engineering cost. It effectively solves the problems of heat preservation, sliding lubrication and waterproofing of exposed pipe ends of prefabricated directly buried heat preservation pipes for high-temperature heat transfer in urban central heating 130℃-600℃. Thermal insulation of oil pipeline not only has advanced technology and practical performance incomparable to traditional trench and overhead pipeline, but also has remarkable social and economic benefits, which is a powerful measure for heating and energy saving. Directly buried heating pipeline technology is adopted for oil pipeline insulation, which indicates that the development of heating pipeline technology in China has entered a new starting point.