Cangzhou Shenlong pipeline professional steel surface treatment, for steel shot blasting, spray painting, pickling (steel structure corrosion and rust removal) and other processing methods have a very high level, whether it is steel plate, profile, or other steel structure parts, can be processed, including export steel project packaging, shot blasting spray painting. Heavy anti-corrosion pipe, cement pipe, buried pipe in waterworks, and other services, followed by shenlong to tell you about the type and design of anti-corrosion steel pipe

What are the characteristics of the anticorrosion process in cement mortar?

1. Reliable anti-corrosion performance.

The cement mortar lining separates the inner wall of the steel pipe from water or air to form a dense protective layer, thus inhibiting the oxidation and corrosion scaling of the inner wall of the steel pipe. Compared with other anticorrosive coatings, cement mortar and steel tube inner wall of the bond force is large, because the hydration of cement particles formed a gel, on the steel tube inner wall of cementation force; Cement mortar induration volume shrinkage and tight. Stick to the inner wall of the steel pipe, resulting in friction; The inner wall of the steel tube is uneven, and the mechanical bite is produced between the cement mortar

2. The necessity of anticorrosion of the inner wall of water transmission steel pipe

Large caliber long-distance water transmission steel pipe has a long service life (usually not less than 30 years), maintenance and transformation of the project hall and high cost, corrosion is not easy to detect (buried hidden engineering) account point, therefore, to ensure reliable service life is more important.

The causticity of the water quality is small, but it exists. According to experience, there are different degrees of rust layer, rust nodules, and pits on the inner wall of the steel pipe without inner wall corrosion protection after several years of use. With each water maintenance, the air into the people, the inner wall of the steel tube soon rust, again filled with water, the rust layer due to the erosion of water and peel off, making the water yellow, and the phenomenon of rust layer peeling off with the extension of the service life and aggravated. Therefore, in order to ensure reliable service life, it is essential to carry out anti-corrosion on the inner wall of the water transport steel pipe. Use to form a squeeze. The existence of the above three bond stresses and the thermal expansion coefficient of cement mortar and steel pipe are the same so that the cement mortar is closely combined with the inner wall of steel sound, and it is not easy to peel off. Cement mortar lining in the early stage of construction often produces cracks, which is mainly due to cement mortar in the air when the volume of shrinkage. By adding human additives, increasing the temperature and humidity during the curing period can effectively reduce the generation of cracks. In addition, the final shrinkage of cement mortar is about 1 to 2 years, after the steel pipe is put into operation, cement mortar in the water for a long time to continue to indurate can make the crack automatically bridge, does not affect the anti-corrosion effect.

(2) Superior hydraulic conditions.

Cement mortar lining. Flat inside surface, not only anti-corrosion, and scale resistance. After the actual observation, the cement mortar lining is smooth and uniform, and the steel pipe inner wall of the uneven and the weld is all covered. The surface of cement mortar lining can form a layer of a slippery substance containing manganese, so as to reduce the friction resistance, the roughness coefficient is about 0.012, and with the extension of the service life has a trend to decrease, the steel pipe and cast iron pipe roughness coefficient is about 0.016-0.0235; Therefore, cement mortar lining is beneficial to improve the water transport capacity of steel pipe, energy saving, and consumption reduction.

(3) Mature technology.

The application of mud mortar lining in anti-corrosion of the inner wall of water conveyance steel pipe has a history of nearly one hundred years. There are also last centuries in our country. Three decades after Yi's initial construction, the pipes are still in good working order. The soil application method of cement mortar lining technology is mature, including an air delivery method, centrifugation method, spraying method, etc., there are not only professional construction units, but also rust removal and coating, testing special equipment and tools, which can be constructed pipe diameter range DN5ODN 4000.

(4) Low investment.

The raw material of cement mortar lining is easy to obtain, the price is cheap, and the construction is simple, so the investment is low. According to the calculation, the investment OF cement mortar lining accounts for 2.4% of the total investment of this project, which is economical and reasonable. (1) Reliable anti-corrosion performance. The cement mortar lining separates the inner wall of the steel pipe from water or air to form a dense protective layer, thus inhibiting the oxidation and corrosion scaling of the inner wall of the steel pipe. Before (1 day)

Common water pipelines are generally cast iron pipes or steel pipes. The anti-corrosion treatment methods for the inner wall of this kind of pipeline are generally lined with cement mortar and epoxy coating. Among them, cement mortar is the most traditional pipeline lining, which is still used in many drinking water industries.

Although the anti-corrosion method of lined cement mortar is relatively common, its disadvantages are obvious, such as:

After stress contraction, it is easy to crack, and the surface defects (such as pockmarks, sand holes, empty drums, etc.) are more;

Cement mortar lining will cause the content of dissolved substances to gain, hardness changes, and NH3 precipitation, resulting in the alkalization of water quality;

The instability of water can also affect cement mortar when the CO2 in the water is out of balance amount, the concentration reached 7 ㎎ / L, and the mortar will lead to damage to sand erosion, which affects water quality.

Cangzhou shenlong pipe manufacturing co., ltd. Is engaged in oil, gas, water, coal slurry mixing medium steel pipeline coating operations, anti-corrosion, insulation, piping is set in a body's specialized pipeline engineering precast construction enterprises, products used in an oil pipeline, chemical piping, electrical, pipe, gas pipe, heat pipes, sewage pipes, etc. Anti-corrosion processing of straight pipe and bend pipe DN40-3000 three-layer structure polyolefin (PE, PP, TPEP,3LPE) steel pipe coated with anti-corrosion, DN40-3800 steel hot stewed bend pipe and pipe fittings coated with FBE, epoxy resin coating anti-corrosion, DN40-3800 steel pipe inner wall resistance reduction, solvent-free epoxy steel pipe, epoxy paint anti-corrosion, Coated plastic steel pipe, dip plastic steel pipe. They are lined with plastic steel pipe PE, PO, PP, PTFE, HDPE, polymer polyethylene corrosion. The company is in strict accordance with China Petroleum and Natural Gas SY/T0413-2002, national GB/T23257-2009, German DIN 30670, American AWWA C210, and other international and domestic anti-corrosion standards.