Quality and control of flange connections
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Quality and control of flange connections

At the moment, almost all requirements for connections are regulated, for example, GOST 12820 describes in detail the steel flanges used for installation. However, it is worth remembering that GOST 12820 describes physical characteristics, material requirements, permissible loads, but does not regulate the quality of flange mounting in any way! In order for the connection to serve for a long time and reliably, it is worth remembering that quality control and verification are necessary at several stages:

The quality of the flanges (including the method of visual inspection), the availability of all the necessary documents confirming compliance with the requirements of GOST 12820;
The quality of the end elements of the pipes to which the flanges are to be connected, and (or) the installation of transition (connecting) elements;
Particular attention must be paid to the quality of welds - they guarantee that the flanges will withstand both pressure and temperature differences;
The mating accuracy of the entire connection (usually the flange is bolted), because misalignment can lead to additional stresses, and the destruction of the structure over time.

In addition, it is worth paying attention to the presence of gaps for thermal deformations, treatment with anti-corrosion compounds at the end of the work, and the appearance of the joints. All this does not require a large investment of time, but it can save in the future a lot of efforts for repair and alteration, in case of mistakes made by the performers, or the use of defective flanges.

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