垫圈的安装要求是什么

垫片安装要求

　　 1. The gasket and flange sealing surface should be cleaned, and there should be no scratches, spots and other defects that affect the sealing performance of the connection.

2.垫圈的外径应小于法兰密封表面的外部，垫圈的内径应略大于管的内径。两个内径之间的差异通常是垫圈厚度的两倍，以确保垫圈压缩内部边缘不应延伸到容器或管道中，以免阻碍容器或管道中的流体流动。

　　3. The pre-tightening force of the gasket should not exceed the design regulations, so as to avoid excessive compression of the gasket and loss of resilience.

　　4. It is best to use a torque wrench when compressing the gasket. For large bolts and high-strength bolts, hydraulic tightening is best. The tightening torque should be obtained by calculation based on the compression of the given gasket, and the size of the hydraulic tightener's oil pressure should also be determined by calculation.

　　 5. When installing the gasket, tighten the nuts in sequence. But it should not be screwed once to reach the design value. Generally, it should be cycled at least 2 to 3 times to make the stress distribution of the gasket uniform.

　　6. For pressure vessels and pipelines with flammable and explosive media, safety tools should be used when replacing sealing gaskets to avoid sparks caused by tools and flanges or bolts colliding with flanges or bolts, which may cause fire or explosion accidents.

　　7. If the pipeline leaks, the pressure must be reduced before replacing or adjusting the installation of the sealing gasket. Operation under pressure is strictly prohibited.

　　 Special installation requirements for gaskets

　　 1. When installing the spiral wound gasket that matches the raised flat flange, care should be taken to ensure that the seal is concentric with the pipe. Generally, the outer reinforcement ring is in contact with the inner circumferential surface of the bolt for positioning, and eccentric installation is not allowed. When installing the basic spiral wound gasket in the flange of the tongue and groove surface, pay attention to keeping the gap consistent with the groove wall surface.

2.在宽度窄的宽度安装金属包覆垫圈时，应放置在垫圈的外侧，然后应将凸缘紧紧地压制，以防止金属垫圈中的涂层填充物被压缩。（或重叠）膨胀并损坏金属包覆垫圈。

3.当法兰的工作温度高于200℃时，应在法兰密封面和密封垫圈之间施加密封剂，以防止密封垫圈和凸缘密封表面在高温下烧结，并增加维护和更换密封垫圈。麻烦。

　　4. When the sealing surface is uneven, the sealing gasket can be installed after applying sealant on the sealing surface. The sealant is generally composed of manganese dioxide, red lead, graphite powder and linseed oil (drying oil) after boiling. The liquid sealant of the corresponding type and brand can be selected according to the conditions of the sealing medium, working temperature and medium pressure.

　　5. For the installation of octagonal metal ring gaskets, when the metal ring gasket and flange sealing groove are not ideally processed, they can be matched to achieve a close fit. For large-diameter metal ring gaskets, it is more difficult to match and research. In order to fill the small unevenness of the metal surface, sealant can be used.