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Fastening technical requirements for installation of equipment and pipe flanges

Fastening technical requirements for installation of equipment and pipe flanges

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  • Time of issue:2023-06-27 14:21
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(Summary description)When installing, ensure that the gasket is new and clean, and dry, and check the gasket for defects and damage; Old gaskets can not be reused; Before installation, make sure that the size and grade of the gaskets used are consistent with the markings on the flange.

Fastening technical requirements for installation of equipment and pipe flanges

(Summary description)When installing, ensure that the gasket is new and clean, and dry, and check the gasket for defects and damage; Old gaskets can not be reused; Before installation, make sure that the size and grade of the gaskets used are consistent with the markings on the flange.

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2023-06-27 14:21
  • Views:
Information

1. Inspection of flange fasteners

 

 

Gasket: When installing, ensure that the gasket is new and clean, and dry, and check the gasket for defects and damage; Old gaskets can not be reused; Before installation, make sure that the size and grade of the gaskets used are consistent with the markings on the flange.

 

Flange: Before installation, check whether the flange surface is damaged, such as scratches, nicks, mud, corrosion, and burrs. When the depth of the dent and scratch of the water line of the sealing surface of the flange is more than 0.2mm, and the coverage exceeds half the width of the gasket sealing surface, the flange must be replaced or the sealing surface reprocessed and repaired; The position of the nut support surface on the back of the flange should be parallel and smooth; Check whether the flanges are aligned according to 6.2 Pipe Installation requirements in SH3501-2011.

 

 

Bolts and nuts:

 

Check whether bolts and nuts are used correctly according to equipment and piping design requirements; The thread and contact surface shall be free of dirt, rust, heavy skin, nicks, burrs, chips, and other external substances that affect torque during the fastening process; Welding or machining of bolts is not allowed; After the flange is installed and fastened, at least two threads are exposed outside the nut; The bolts and nuts must be lubricated before use so that the bolts have a low friction coefficient and improve the anti-skid and anti-corrosion properties of the bolts and nuts; Stud threads, nut threads, and contact surfaces must be degreased and dried before lubricating; For bolt threads, nut threads, nut bearing surfaces, washers, and nut support surfaces on flanges, uniform lubricating oil should be properly used; Use the high-temperature anti-bite mixture as needed.

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