if the interior and exterior are fully coated steel pipe with plastic, no anti-corrosion oiling is required. if the interior is plastic-coated and the outside of the pipe is only used for insulation, no anti-corrosion oiling is required. if the interior is plastic-coated and the

china's steel-plastic steel pipes have not been developed for a long time, and there is still a large gap compared with foreign countries in raw materials, technology, manufacturing equipment, and other aspects. for example, coating on the outer wall of the pipeline can increase the circuit resis

connection methods of plastic-coated steel pipes: threaded connection, groove connection, flange welding, and plastic-coated steel pipes are generally threaded.the general connection method is a threaded connection within 100 mm of plastic-coated steel pipe;

in recent years, the status of ordinary steel pipes has declined rapidly. the fundamental factor is that the environment is severely corroded. even if the wall thickness of steel pipes is large, it is always unrealistic to use wall thickness to slow down corrosion, because the wall layer of steel

1. process comparison: since the plastic-coated steel pipe is constructed under no pressure, the lining layer has no internal stress. the lining layer and the steel pipe are a one-step process, and the construction process is simple. the plastic-lined steel pipe first needs to ex

the use of plastic-coated steel pipes in developed countries has been relatively mature. for example, in the water pipes in the united states, japan, and other countries, 80% to 90% of the pipes are plastic-coated steel pipes. the coated steel composite pipe meets the constructio

the coating methods of plastic-coated steel pipes for large-diameter water delivery are divided into two categories: internal coating and external coating at the same time, and internal coating and external coating separately.process coating methods are also div

plastic coated steel pipe construction1. it should be implemented by cecs125:2001 of "technical regulations for building water supply plastic-coated composite pipe pipeline engineering".2. the following construction equipment should be used for plastic-coated steel

1. epoxy coal tar pitch anti-corrosion coated layera. epoxy coal tar pitch anti-corrosion coating is suitable for anti-corrosion on the outer wall of buried steel pipelines for transporting oil, water, and gas, and the temperature of the transport medium is required to be lower than or equ

large-diameter plastic-coated steel pipes are mainly made of spiral steel pipes or seamless steel pipes. it is not recommended to use straight seam welded pipes. longitudinal welded pipes are usually not as good in bearing pressure as spiral steel pipes, and the cost is higher th

epoxy resin coated steel pipe coating belongs to thermosetting plastics, which combines the common advantages of steel and plastic, and its scope of application includes1. fire sprinkler system and domestic water supply and drainage;2. ga

plastic coated steel pipes, also known as plastic-coated pipes, steel-plastic composite pipes, and plastic-coated composite steel pipes, use steel pipes as the substrate, and weld a layer of plastic anti-corrosion layer or steel-plastic composite steel pipe with plastic anti-corr

1. epoxy resin coated steel pipe has high mechanical strength, suitable for harsh environments;2. the inner and outer coatings of epoxy resin-coated steel pipes can prevent metal oxidation and have good chemical corrosion resistance;3. epoxy resin coated steel pipe

1. plastic-coated steel pipe cuttingmetal saws should be used for cutting plastic-coated steel pipes, and sawing machines should be used for large-diameter pipes. when using entrenched cutting, the speed should not exceed 800r/min; the section of the pipe to be cut should

large-diameter plastic-coated steel pipes are mainly made of spiral steel pipes or seamless steel pipes. it is not recommended to use straight seam welded pipes. longitudinal welded pipes are usually not as good in bearing pressure as spiral steel pipes, and the cost is higher th

how to use plastic-coated steel pipes correctly should be used correctly by the specifications. large-diameter plastic-coated steel pipe is a new type of pipe, which is used in many fields and has many excellent properties, especially its anti-corrosion performance is loved by pe

the hazard of incomplete penetration of the plastic-coated steel pipe is that the effective area of the weld is reduced, and the plastic-coated steel pipe reduces the joint strength.secondly, the harm caused by the stress concentration caused by incomplete penet

plastic-coated steel pipe has the dual advantages of steel pipe and plastic pipe. it not only has the mechanical strength and bearing pressure of steel pipe, but also has the characteristics of the smooth inner wall of the non-metallic pipe, strong wear resistance, strong corrosi