The spiral steel pipe is a spiral seam steel pipe based on the steel roll plate as the raw material, which is often squeezed and formed, and welded with the automatic double -sided arc welding process.The length of the spiral steel pipe is 12 meters, and the delivery of the ruler is settled, and the specifications are basically above 219mm.
The steel plate roll tube adopts a tannant welding process, which can produce steel pipes with a diameter of more than 400 and 8-100mm wall thickness.Usually do not set a ruler, and the delivery is generally used.
The execution standards for steel plate roll tube products are: GBT50205-2001, GBT3092-2001, etc.Roll pipes are widely used in projects such as petroleum, chemical industry, natural gas transportation, piles and urban water supply, heating, gas supply and other projects.
The price of the same model of the steel plate roll tube is higher than the spiral steel pipe. The steel plate roll tube is mainly used in non -model, or in industries with thick thickness.
There are more domestic steel pipeline anticorrosive anti -corrosion layers include petroleum asphalt, PE jacket and PE foam jacket, epoxy coal porcelain paint, epoxy powder and three -layer composite structure, epoxy coal pettelona band (PF type), Corruption epoxy coal pommellar cooler band (RPC type), etc., the most widely promoted pipeline anticorrosive methods are three layers of PE composite structure, single -layer powder epoxy, PF type cold entanglement band, RPC cold -type coldTogether.
1. Petroleum asphalt, extensive raw materials, low prices.However, the labor conditions are poor, the quality is difficult to guarantee, and the environmental pollution is serious.
2. Oreoxanum asphalt, easy to operate, but the covering time is long, and it is affected by the environment. It is not suitable for field operations. It is difficult to construct below 10 degree C.
3. Epoxy powder anti -corrosion, uses electrostatic spray coating, melted with the body with the same type of material, and has strong adhesion, but the waterproof resistance of epoxy powder is poor (high water absorption rate is 0.83%).Protective design brings some difficulties.The on -site appliances are high, the operation is difficult, and the quality is not easy to control.
4. 3PE thermal retractable materials, strong sealing of the pipeline, high mechanical strength, strong waterproofing, stable quality, convenient construction, good applicability, and not polluting the environment.PE's water absorption rate is low (less than 0.01%), at the same time, high epoxy strength, low water absorption, and good hot melting glue are good, etc., have high anti -corrosion reliability. The disadvantage is that compared with other supplementary materials costs,costly.
5. The construction of PF type and RPC -type cooler band is simple and easy to operate. The three types of setting glue for the supporting PF type of epoxy coal pilum can be constructed under any environment, any season, and any temperature conditions.
6. The characteristics of the cold entanglement belt and the 3PE heat belt are: suitable for the main anticorrosive layer pipeline of various materials, and other methods are suitable for the main body anticorrosive layer pipelines with the same or close to the material.
As some pipelines are developed, some pipelines also need to heat up at the same time. Petroleum is a very complicated mixture, which is easy to corrodes pipelines. Anti -corrosion is necessary.Skating and contraction can frozen pipelines, affecting stable supply.
