Structural Characteristics of Black Jacket Directly Buried Straight Seam Steel Pipe
Part I: Anti-corrosion Internal Task Steel Pipe
Under normal conditions, according to the design requirements of customers or the design requirements of national codes, the straight seam welded pipe GB3092-93, seamless steel pipe GB8163-87 and spiral steel pipe GB9711-88 and SY/T5037 are selected as the internal task steel pipe for its delivery medium. The technical grade of shot blasting and rust removal on the outer surface of steel pipe reaches SA2 level in GB8923 specification, and the outer appearance of steel pipe reaches SA2 level in GB8923 specification. The roughness of the steel pipe reaches R=12.5 micron in GB6060.5 specification. After the surface of the steel pipe stops decontamination and rust removal technology, it will be coated with an anticorrosive coating to further enhance its waterproof and anticorrosive function. The diameter of the inner task steel pipe can be divided into several types for customers to choose. (Local diameter models of internal task steel pipes: 20, 25, 32, 34, 38, 40, 42, 48, 57, 76, 89, 108, 133, 159, 219, 273, 325, 377, 426, 478, 529, 630, 720, 820, 920, 1020, 1120, 1220, 1320, 1420, etc.)
Second part: rigid polyurethane foam insulation layer
Rigid polyurethane foam insulation layer is made of high-performance polyether polyols and methyl polyphenyl polyisocyanate as raw materials, according to a certain proportion to stop harmony, through special equipment with the help of liquid activity, the harmony of the liquid once injected into the gap between the internal task steel pipe and the high-density polyethylene outer guard pipe, through chemical reaction, foaming, making it foam filling. With the help of the super-strong cohesion of rigid polyurethane foam plastics in the cavity between the high-density polyethylene outer guard pipe and the full-filled inner task steel pipe, the tight cohesion of the two becomes a whole which is not easy to be scattered.
Part 3: High Density Polyethylene External Protector
High density polyethylene exterior guard pipe is made of excellent PE high density polyethylene as raw material, advanced vacuum sizing equipment and smart consumption process are adopted to stop consumption. The diameter and wall thickness of high density polyethylene exterior guard pipe can stop consumption according to the design requirements of customers or the design requirements of national standards. High density polyethylene exterior guard pipe Under normal conditions, the pipes can be divided into black and yellow colors, and black jacket and yellow jacket pipes. The basic data and functional objectives of the pipes are completely opposite.
The disadvantage characteristics of direct-buried polyurethane insulating pipe:
1. The rigid polyurethane foam is chosen as the insulation layer of the direct-buried polyurethane insulation pipe. The closed-cell ratio of the rigid polyurethane foam plastic reaches about 97%, and its water absorption rate is very low. It avoids the immersion of external water, corrosive liquid and microorganisms, prevents the development and consumption of microorganisms, and further loses the service life of the direct-buried polyurethane insulation pipe. Guarantee.
2. The thermal insulation function of rigid polyurethane foam plastic insulation layer is very high, its heat loss is only 25% of the traditional pipes. Temporary small amount of operation can save a small amount of power, thus reducing the cost of power.
3. Because the direct-buried polyurethane insulation pipe has the function of waterproof and anticorrosion, it is not necessary to lay pipe trenches in the construction process. It can be indirectly buried in the world or water, prolonging the construction period and reducing the construction cost.
4. According to the investigation of foreign related materials, the application of direct-buried polyurethane insulation pipe in the right way can make its service life reach about 30 to 50 years.
5. Easy to construct, short construction period, complex and fast operation, one-time forming and other disadvantages.
In summary, all the above-mentioned Shandong Hipper Pipe Technology Development Co., Ltd. provides, want to know more about the black jacket straight-seam steel pipe, welcome to pay attention to our website: https://www.sdhpgy.com Thank you for your support!
