Since the birth of polyurethane synthetic data in the 1930s, polyurethane thermal insulation pipe has been developed rapidly as an excellent thermal insulation material, and its application scope is becoming more and more widespread. Because of its construction specifications, polyurethane thermal insulation pipe, polyurethane foamed thermal insulation pipe in the pipeline system, elbow is the pipe fittings to change the direction of the pipeline. According to the angle, there are three commonly used, in addition, according to engineering requirements, including other abnormal angle elbows. The data of elbows are cast iron, stainless steel, alloy steel, calcinable cast iron, carbon steel, non-ferrous metals and plastics. The ways of joint with pipe are flange joint, hot melt joint, electric melt joint, thread joint and socket joint. According to the consumption process, it can be divided into welding elbow, punching elbow and casting elbow.

聚氨酯保溫鋼管

Polyurethane Thermal Insulation Pipe

（1）聚氨酯保溫鋼管工作鋼管：依據(jù)保送介質(zhì)的技術(shù)請求分別采用有縫鋼管、無縫鋼管、雙面埋弧螺旋焊接鋼管。

(1) Polyurethane insulating steel pipe working pipe: According to the technical requirements of delivery medium, seamless steel pipe, double-sided submerged arc spiral welded steel pipe are used respectively.

（2）聚氨酯保溫鋼管保溫層：采用硬質(zhì)聚氨酯泡沫塑料。

(2) Polyurethane insulation pipe insulation layer: rigid polyurethane foam plastic.

（3）聚氨酯保溫鋼管維護(hù)殼：采用高密度聚乙烯或玻璃鋼。

(3) Polyurethane insulating steel pipe maintenance shell: using high density polyethylene or FRP.

（4）聚氨酯保溫鋼管滲漏報警線：制造高溫預(yù)制直埋保溫管時，在靠近鋼管的保溫層中，埋設(shè)有報警線，一旦管道某處發(fā)作滲漏，經(jīng)過警報線的傳導(dǎo)，便可在專用檢測儀表上報警并顯現(xiàn)出漏水的精確位置和滲漏水平的大小，以便通知檢修人員疾速處置漏水的管段，保證熱網(wǎng)   運(yùn)轉(zhuǎn)。

(4) Leakage alarm line for polyurethane insulating steel pipes: When manufacturing high temperature prefabricated directly buried insulating pipes, an alarm line is embedded in the insulating layer near the steel pipes. Once leakage occurs somewhere in the pipeline and is transmitted by the alarm line, it can alarm on the special detection instrument and show the exact position and level of leakage, so as to inform the inspectors to quickly dispose of the leakage section. Guarantee the operation of the heat network.

聚氨酯保溫鋼管在國外一些興旺   已成為一項比擬成熟的技術(shù)。近十幾年,我國供熱工程技術(shù)人員經(jīng)過消化,吸收這項技術(shù),正推進(jìn)著國內(nèi)管網(wǎng)敷設(shè)技術(shù)向   高的層次開展。十幾年來的理論成果充沛證明了聚氨酪保溫直埋管敷設(shè)方式與傳統(tǒng)的地溝及架空敷設(shè)相比,具有諸多優(yōu)點。直埋式保溫管是由保送介質(zhì)的鋼管,高密度聚乙烯外套管,以及鋼管和外套管之間的硬質(zhì)聚氨酯泡沫保溫層嚴(yán)密分離而成。這也正是聚氨酪保溫直埋管在我國供熱工程。

Polyurethane insulating steel pipe has become a comparatively mature technology in some foreign countries. Over the past decade, after digestion and absorption of this technology, China's heating engineers and technicians are pushing the domestic pipeline network laying technology to a higher level. Over the past decade, the theoretical achievements have amply proved that polyurethane thermal insulation direct buried pipe laying method has many advantages compared with traditional trench and overhead laying. The directly buried thermal insulation pipe is made up of a steel tube, a high density polyethylene sheath pipe, and a rigid polyurethane foam insulation layer between the steel tube and the outer tube. This is also the direct buried polyurethane thermal insulation pipe in China's heating project.

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