Prefabricated PU anti-corrosion buried pipeline insulation is well received for its good performance, convenient construction, and long service life. Its structure consists of three parts: outer protective jacket, insulation layer, and leak-prevention layer. The outer jacket material is polyethylene, FRP, or other materials. Laying methods are direct-buried, overhead, and trench. Our plant has accumulated extensive experience in PU insulation of pipe fittings over many years; quality meets national and industry standards and is trusted and well received by customers.
Prefabricated PU anti-corrosion buried pipeline insulation offers high-efficiency thermal insulation, waterproofing, corrosion protection, heat insulation, sound insulation, flame retardance, cold resistance, light weight, high strength, light and rapid construction, and resistance to plant-root puncture. It has become an indispensable material for thermal insulation, waterproofing, leak sealing, and sealing in construction, transportation, petroleum, chemical, electric-power, and refrigeration industries. Direct-buried insulated pipe is used for thermal insulation and cold insulation of various indoor and outdoor pipelines, district-heating pipelines, central air-conditioning pipelines, and chemical and pharmaceutical industrial pipelines, as well as oil- and steam-transmission pipeline projects.
Prefabricated PU anti-corrosion buried pipeline insulation has considerable advantages over traditional insulated pipes of various types: 1. Excellent thermal insulation performance, with heat loss only 25% of that of traditional pipes; long-term operation can save a large amount of energy and significantly reduce energy costs. 2. Strong waterproofing and corrosion resistance; no additional pipe trench is required, and it can be buried directly underground or in water; construction is simple and fast, and overall cost is low.
In a piping system, an elbow is a fitting that changes the direction of the pipeline. By angle, the three commonly used types are 45°, 90°, and 180°; other non-standard angles are also used according to project needs. Elbow materials include cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals, and plastics. Methods of joining to pipe include direct welding (the most common method), flanged joints, heat-fusion joints, electrofusion joints, threaded joints, and socket joints. By manufacturing process they may be classified as welded, stamped, or forged elbows. Other names include 90-degree elbow, right-angle bend, and long-radius elbow.
(1) Carrier pipe of PU insulated steel pipe: According to the technical requirements of the conveyed medium, welded steel pipe, seamless steel pipe, or double-sided submerged-arc spiral welded steel pipe is selected. (2) Insulation layer of PU insulated steel pipe: rigid PU foam is used. (3) Protective jacket of PU insulated steel pipe: HDPE or FRP is used.
(4) Leakage alarm wire of PU insulated steel pipe: When manufacturing high-temperature prefabricated direct-buried insulated pipes, an alarm wire is embedded in the insulation layer close to the steel pipe. Once leakage occurs somewhere in the pipeline, the signal is transmitted through the alarm wire, and a dedicated detection instrument will alarm and display the exact location and severity of the leak, so that inspection personnel can quickly handle the leaking section and ensure safe operation of the heating network.
