What are the characteristics of the flange in the summer test?

In the summer when the flange in the installation and use, the flange is often to detect the tightness. In the industrial field, the role of the flange is very obvious, often used in sealed containers, the container flange is also called equipment flange, is generally the equipment body parts associated with the flange; Pressure vessel flange is a kind of bearing pressure property in the equipment flanges.

Often many of the container leakage is connected with the flange, because the flange joint seal failure Light will cause energy, raw material waste, heavy will lead to equipment scrap, shutdown, casualties and serious environmental pollution. Flange in use generally have a matching gasket, gasket is a plastic deformation, and has a certain strength of the material made of the ring. Most of the gaskets are made from non-metallic plates, or by professional factories according to the specified size, the material is asbestos rubber plate, asbestos plate, PTFE plate, polyethylene board, etc. also useful thin metal plate (tin, stainless steel) to the asbestos and other non-metallic materials wrapped up in metal package gasket There is also a thin steel belt and asbestos belt around the wound-type gasket, the most commonly used is stainless steel belt and graphite wound metal wound gasket, depending on the use of the environment, winding belt can also use asbestos.

Ordinary rubber gasket for the occasion of less than 120 ℃, asbestos rubber gasket for water vapor temperature less than 450 ℃, oil temperature below 350 ℃, pressure less than 5MPa occasions, for the general corrosive medium, the most commonly used is acid-resistant asbestos plate.

Common pressure vessel flange Standard: jb1157-82~jb1160-82, jb4700-2000~jb4707-2000 b16.47a/b B16.39 B16.48

High pressure vessel flanges for steel pressure vessels with a nominal pressure of 0.25-1.6mpa and operating temperatures above -20℃~300℃ Therefore, as an industrial area, the flange connection should be inspected regularly to find a soap bubble popping up near the flange weld.

The leakage of the flange for the surface with neck flat welded steel pipe flange, the material is 304 of the contact medium for gaseous vinyl chloride monomer (VCM) and water, design pressure of 1.4MPa, the maximum working pressure of 1.1MPa, the reaction temperature of 64.7 ℃, temperature range of 30~70℃. In addition, there are many reasons for the leakage of the flange, we must do a rationalization of the test, including macroscopic topography analysis of macroscopic observation found that there are visible cracks in the outer wall surface of the flange, the crack is concentrated in the near Weld area, crack distribution, crack shape.