Benxi Prefabricated polyurethane Direct burial Thermal insulation pipe introduce Polyurethane foam insulation Steel pipe As the polyurethane rigid foam insulation layer is closely bonded to the outer skin of the steel pipe, it can isolate the infiltration of air and water and play a good anti-corrosion role. At the same time, its foam pores are closed, and its water absorption is very small. High density polymer ethylene Housing Glass The steel shell has good anti-corrosion, insulation and mechanical properties.
Sufficient attention must be paid. The on-site joint insulation of prefabricated directly buried insulation pipe can be carried out only after the pressure test is qualified. The on-site joint insulation construction. This content is that the special construction quality of prefabricated directly buried insulation pipeline directly affects the service life. The insulation layer has two methods: on-site foaming construction and insulation tile construction. No matter which method is used for construction, there shall be no annular space, crack, delamination and other defects. There are many methods for maintenance layer (such as high-density polyethylene and glass fiber reinforced plastic protective layer), but the integrity, tightness and waterproof of joints must be guaranteed.
Overview of HDPE sheath polyurethane directly buried thermal insulation pipe Overview of energy-saving directly buried thermal insulation pipe consists of steel pipe, anti-corrosion coating, thermal insulation layer, anti-corrosion and compressive protection layer. If it is a * * * warm pipe, add a cooling layer between the insulation layer and the anti-corrosion layer. These pipelines have the advantages of less heat loss, strong compression resistance, good waterproof and anti-corrosion performance, etc. Compared with the traditional trench laying pipeline, it has the advantages of good thermal insulation performance, simple construction and installation, less land occupation, low project cost, short construction period, etc. Especially in terms of energy conservation, it is incomparable to any insulated pipeline at present. According to the test report of Tianjin Energy Conservation Technology Service Center, The cooling rate is 0.1 ℃ per 100 meters, and the heat loss rate is 2.07% per 100 meters. Generally, 10.4 tons of standard coal can be saved per year in one kilometer of insulation pipeline. "Pipe in pipe" thermal insulation pipe II. Comparison of thermal insulation performance between polyurethane directly buried thermal insulation pipe material and other thermal insulation materials Rigid polyurethane foam plastic is a kind of thermal insulation material with good performance. The foam is of closed cell structure, and the thermal conductivity of the gas (Freon F11) in the closed cell (0.007W/m.K) * * * is small. Therefore, The thermal insulation performance of polyurethane directly buried insulation pipe material is lower than that of almost all other insulation materials. Compared with other insulation materials, it achieves the same thermal insulation, and the thickness of insulation layer can be reduced by 30-80%. High density low pressure polyethylene (HDPE) sheath polyurethane directly buried insulation pipe overview HDPE sheath polyurethane directly buried insulation pipe overview energy-saving directly buried insulation pipe consists of steel pipe, anti-corrosion coating, insulation layer, anti-corrosion and compressive protection layer. If it is a * * * warm pipe, add a cooling layer between the insulation layer and the anti-corrosion layer. These pipelines have the advantages of less heat loss, strong compression resistance, good waterproof and anti-corrosion performance, etc. The service life is generally about 40-50 years.
It is used for the transmission pipe network of liquid and gas. Chemical pipeline insulation engineering Petroleum, chemical industry, central heating network, * * * air conditioning and ventilation pipeline, municipal engineering, etc. are composed of steel pipe, glass fiber reinforced plastic inner sheath, glass fiber reinforced plastic shell, and are also characterized by high temperature resistant thermal insulation layer, lubrication layer, and elastic seals.
Shaoxing composition:
(1) Working steel pipes: according to the technical requirements of the transmission medium, seamed steel pipes, seamless steel pipes and double-sided submerged arc spiral welded steel pipes are used respectively.
(2) Thermal insulation layer: rigid polyurethane foam.
(3) Protective shell: high-density polyethylene or glass fiber reinforced plastic.
(4) Leakage * * * line: When manufacturing high-temperature prefabricated directly buried insulation pipes, * * * line is embedded in the insulation layer near the steel pipe. Once the pipeline leaks somewhere, through the conduction of the alarm line, * * * can be displayed on the * * * detection instrument and the exact location of the leakage and the size of the leakage degree can be displayed, so that the maintenance personnel can be notified to quickly deal with the leaking pipe section to ensure the safe operation of the heat supply network. Advantages of rigid polyurethane foam:
The reason of low water absorption is that the closed cell rate of polyurethane foam is up to 92%. With low thermal conductivity and low water absorption, polyurethane foam insulation pipe, together with insulation layer and high density polyethylene or glass fiber reinforced plastic protective shell with good waterproof performance outside, has changed the situation of traditional trench laying of heat supply pipeline "wearing wet cotton padded jacket", greatly reducing the overall heat loss of heat supply pipeline. The heat loss of heat supply network is 2%, less than * * 10%.
Introduction standard of polyurethane foam insulation pipe:
The production of hard foam insulation pipe includes assembly tooling, welding tooling, pressure test, vacuum degree test, thermal insulation effect measurement equipment and tooling that are suitable for the products within the permitted scope. The pipes with insulation layer and anti-corrosion shell are manufactured with equipment such as product lifting and transfer; Sand blasting abrasive pretreatment equipment, coating and extrusion raw material mixing and processing equipment; Processing fixture, identification and other auxiliary equipment. The manufacturer of physical and chemical inspection equipment and other inspection equipment, production insulation layer plus anti-corrosion shell pipe, shall have analytical balance, chemical analysis instrument, mechanical property tester, corrosion resistance test and inspection instrument and other physical and chemical inspection equipment; There should be test and inspection equipment with factory inspection items required by product standards, such as spark leak detector, impact tester, peel strength detector, etc; And special process inspection instruments, such as metal surface treatment quality inspection instruments. The design and process documents shall include the general catalog of drawings for production and sales of products, complete sets of drawings, part drawings, including design calculation sheets, process and tooling drawings, etc.
