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衬塑钢管技术要求及规范

发布时间:2020-05-0115:19人气:
更新一下英文版的衬塑钢管技术要求及规范。
    The sealing surface of the flange must be s用于输送热水的衬塑钢管试件经三个周期冷热循环试验,衬塑层无变形裂纹等缺陷,其结合强度不低于上述(3)不应小于1.0MPa(100N/ cm²)的规定值。mooth and free from defects such as groove and sand hole in the direction of radiation
    Flange gasket shall be in accordance with the standard. Oblique gasket or double-layer gasket are not allowed. When the soft gasket is used, the periphery shall be neat, and the gasket size shall be consistent with the flange sealing surface. The inner diameter of the gasket shall not be less than the inner diameter of the pipe, and the outer diameter shall not be greater than the diameter of the inner circle of the flange screw hole generally. When the large-diameter gasket needs to be spliced, it shall adopt the form of oblique joint or labyrinth, and flat joint is not allowed.
    During gasket installation, molybdenum disulfide grease, graphite engine oil or graphite powder can be coated respectively as required to facilitate flange sealing and gasket replacement.
    The soft steel and copper metal gasket shall be annealed before installation.
    Flange connection shall be selected according to medium property, temperature and pressure. Do not use low pressure flange on high pressure or high pressure flange on low pressure. The former is prone to accidents in production, while the latter will cause waste. Flanges of different specifications and materials cannot be used in pairs.
    Bolts for flange connection shall be made of specified materials and specifications. Low pressure shall not be used on high pressure. Normal temperature shall be used on high temperature. Specifications shall be the same and installation direction shall be the same. Bolts and nuts for valve connection shall be placed on one side of valve body. The fastening bolts shall be symmetrical and even with moderate tightness. After fastening, the exposed length shall not be more than 2 times of the pitch. The diameter of general bolt is 2-3mm smaller than that of flange hole.
    After the bolt is tightened, it shall be close to the flange without wedge joint. No more than one washer is required.
    Flange shall not be buried directly. Inspection well shall be set at the flange connection of buried pipeline. The flange is not allowed to be installed in the floor, wall and sleeve. In order to facilitate disassembly and assembly, the distance between the flange and the edge of the bracket or the building shall not be less than 200mm.

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