What are the specific testing methods for plastic coated steel pipes?
Commonly used test methods for plastic coated steel pipes:
1. Appearance inspection is to visually check the appearance quality of the coated steel pipe.
2. Thickness measurement is to measure the coating thickness of any four points orthogonal on the circumference on any two cross sections.
3. Pinhole test refers to the inspection of the specified test voltage of the steel pipe coating by the electric spark leak detector, and also checks whether the spark is generated.
4. The bending test is generally performed on a bending machine or a mold. It is worth noting that during the bending test, there is no filler in the tube, and the weld is located on the side of the curved main surface.
5. The flattening experiment is to place the test piece between two plates and gradually compress it on the pressure tester until the distance between the two plates is four-fifth of the outer diameter of the test piece. The flattening is the coated steel pipe weld perpendicular to the load. Apply direction.
6. Low temperature test means that the test piece is placed in a low temperature chamber, and after being left for one hour, it is placed in a normal temperature environment. These methods monitor whether the product is up to standard
Plastic coated steel tubes have a long service life of up to 50 years. Fourth, the coating of the inner wall of the plastic coated steel pipe has strong adhesion, excellent impact resistance and strong resistance to cathodic disbondment. The plastic coated steel pipe can prevent microbial growth and scaling due to the smooth surface of the inner wall of the pipe. 5. The plastic coated steel pipe has a low curing shrinkage rate. Generally, it is one to two percent, and it is one of the varieties in which the curing shrinkage rate of the thermosetting resin is low, and the coefficient of linear expansion is also small. Therefore, the volume changes little after curing. Sixth, the plastic coated steel pipe has a small conveying resistance, which can increase the flow rate and save energy. 7. The plastic coated steel pipe has good stability and excellent chemical resistance. The epoxy cured product has good chemical stability. It is resistant to various media such as alkali, acid and salt. Eight, plastic coated steel pipe has excellent electrical insulation. The above describes the role of plastic coated steel pipe and the eight characteristics of plastic coated steel pipe, and hopes to provide a certain explanation for the users who use the product.
Plastic coated steel pipes are mainly divided into two types: inner coated plastic steel pipe and inner and outer coated plastic steel pipe. The coating material is generally made of epoxy resin and polyethylene, and can also be customized according to customer requirements. The plastic coated steel tube effectively solves the defects in the production and installation of the previous steel-plastic composite pipe, and has been well received and recognized by many customers.
Process standard 1, coating adhesion: polyethylene coating layer adhesion ≥ 30N / cm, epoxy resin coating adhesion is 1 ~ 3 grade.
2. Bending performance: The steel pipe with a nominal diameter of not more than 50mm is bent, no crack occurs after bending, and no delamination occurs between the steel and the inner and outer plastic layers. 3. Flattening performance: steel and plastic pipes with a nominal diameter greater than 50mm and no more than 600mm are flattened, no cracks occur after flattening, and no delamination occurs between the steel and the inner and outer plastic layers.
4. Hygienic requirements: The inner plastic layer of steel-plastic pipe conveying domestic drinking water and hot and cold water should meet the requirements of GB/T17219.
5. Coating plastic layer pinhole test: The entire inner and outer surfaces of the steel-plastic pipe provided for testing shall be inspected by an electric spark detector, and no spark shall be generated during the test.
6. Fire resistance test: The steel and plastic pipe for fire protection shall be able to withstand the fire resistance test for 15 minutes, and there shall be no leakage and deformation damage after the test.
Plastic coated steel pipes can also effectively prevent the damage of plant roots and soil environmental stress. China's plastic-coated steel pipe industry has developed rapidly, most of which are used for lining polyethylene pipes in cold water, which is closer to metal pipes in performance.
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