Polyethylene tape quality requirements

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with reference to the People's Republic of China oil and gas industry standards SY/T0414 - 98 'steel pipeline polyethylene anticorrosive tape coating technology standard' the relevant provisions of: polyethylene tape coating, shall meet the following technical requirements:

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( 1) Polyethylene anticorrosive tape coating surface should be smooth, uniform lap, no bubbles, wrinkles, and permanent damage;

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( 2) Standard: common anticorrosive coating thickness 0 or higher. 7毫米; 1 or higher level strengthen anticorrosive coating thickness. 4毫米;

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( 3) Anticorrosive coating peel strength: ring to open 10 mm wide, length> 100 mm coating, until the pipe body. Then with spring balance and wall into a 90 - degree Angle and speed should be not more than 300 mm/min, peel strength should be 18 n/CM or more;

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( 4) Electric spark leak detection, leak detection speed is not greater than zero. 3 m/s, not dozen spark as qualified. Leak detection voltage according to the following formula: when Tc < 1 mm: V = 3294, when the Tc 1 mm or higher: V = 7843, Tc for anti-corrosion layer thickness, mm.