dn100 @ Hebei Hebei plastic pipe coated steel tube // // fire special dedicated water pipe

Advantages edit 1. adaptation buried and humid environments, and can high temperature and low temperature. 2. The anti-interference ability, if plastic pipe as a cable casing, can effectively shield the signal from outside interference. 3. withstand pressure strength, maximum pressure up to 6Mpa. 4. Insulation performance, as a protective tube wire leakage phenomenon will never happen. 5. No burr, smooth wall, suitable for construction when wearing a wire or cable. 5 engineering standards Edit "building water supply and drainage design specifications" GB 50015-2003 "Building Water and Heating Engineering Construction Quality Acceptance" GB50242-2002 "coal mines with product safety signs Interim Measures," 6 Detection Method Editor [1] Visual inspection Visual coated steel exterior quality inspection, the test results should be consistent with the provisions of 5.1. Thickness measurement takes two cross-section of different lengths from both ends of the coated steel pipe at each cross section perpendicular to the circumference of the electromagnetic thickness measurement of coating thickness any four points, the test results should be consistent with the provisions of 5.4. Pinhole test specimen pipe length of about 1000 mm, with the steel pipe coating spark leak check at the specified test voltage, the coating thickness is not greater than 0.4mm, the test voltage of 1500 V, the coating thickness greater than 0.4 mm the test voltage is 2000 V. Check for spark generated test results should comply with the provisions of 5.5. Adhesion test Adhesion test according to CJ / T 120-2008 in 7.4.2 The test result shall comply with the provisions of 5.6. DN≤50mm coated pipe bending test bending test. Pipe specimen length of (1200 ± 100) mm. At a temperature of (20 ± 5) ℃ environment to nominal pipe diameter of 8 times the radius of curvature of the bending angle of 30o, bend at the elbow or die. Without bending test tube filler, side of the main surface of the curved weld. After the test, from the middle of the curved arc cut the specimen inside check coat, test results should be consistent with the provisions of 5.7. Flattening test DN> 50 mm coated steel tube flattening test. Specimen size pipe length (50 ± 10) mm. At a temperature of (20 ± 5) ℃ in the environment shown in Figure 1, the specimen is placed between two plates, the pressure test machine is gradually compressed to a distance between the two plates of four-fifths of the outer diameter of the specimen When crushed coated steel weld load is applied perpendicular to the direction. After the test, check your coat, test results should be consistent with the provisions of 5.8. Flattening test impact test from anywhere coated steel pipe cut the sample length of 100 mm, at a temperature of (20 ± 5) ℃ environment, shown in Figure 2, the impact test as defined in Table 2 was observed damage the coating. During the test, the weld should be in the direction of the impact of the opposite side, the test results should be consistent with the provisions of 5.9. Impact test conditions Nominal diameter DN mm hammer weight, kg drop height, mm 15 ~ 251.0300 32 ~ 502.1500 80 ~ 3006.31000 impact test Vacuum test pipe specimen length of (500 ± 50) mm, use appropriate measures to block the pipeline inlet exports, imports gradually increased from a negative pressure to 660 mm Hg, keeping 1 min, after the test check your coat, test results should comply with 5.10. High-temperature test pipe specimen length of (100 ± 10) mm, the specimen is placed in a thermostat, the temperature was raised to (300 ± 5) ℃, and constant temperature 1 h, and then remove the natural cooling to room temperature. After the test, remove the specimen to check your coat (allowing the appearance of darker, dark phenomenon), the test results shall comply with 5.11. Low temperature test specimen size pipe length (100 ± 10) mm, the specimen is placed in a cryostat, and cooled to (-30 ± 2) ℃, and constant temperature 1 h, and then remove the place at a temperature of (20 ± 5) environment ℃ of (4 ~ 7) h. Hydraulic pressure cycle test and supply system is connected to remove the air filled with water, and then from 3000 (0.4 ± 0.1) alternating MPa to MPa of hydrostatic test, each test period of not more than 2 s. Check inside the coating, in accordance with regulations 6.4 adhesion test conducted after the test, the test results shall comply with 5.13. Temperature cycle test pipe specimen length of (500 ± 50) mm, the specimen is placed in the following order 24 h at each temperature condition: (50 ± 2) ℃; (-10 ± 2) ℃; (50 ± 2 ) ℃; (-10 ± 2) ℃; the specimen is placed after the test at a temperature of (20 ± 5) ℃ environment 24 h, in the case of coating inspection, carried out in accordance with the provisions of 6.4 adhesion test, the test results should be compliance 5.14. Heated aging test pipe specimen size length of about 100 mm, pipe ends exposed Department should conduct appropriate anti-corrosion treatment, the pipe is placed at (70 ± 2) ℃ distilled water soak 30 d, after the test taken to cool to room temperature, Check the specimen within the coating, the test results shall comply with 5.15.