Flange Connection Operation Procedure

Gasket placed between the two flange sealing surface, tighten the nut after the gasket on the surface of the pressure to achieve a certain number of deformation, and fill the seal surface of the uneven place, so that the connection is tight.

A flange join is a detachable join. According to the connecting parts can be divided into container flanges and pipe method, according to the structure of the type, the whole flange, looper flange and threaded flange. Common integral Faran welding flanges and Butt welding flanges.

The rigidity of the flat welding flange is poor, suitable for the occasion of the pressure P≤4mpa, the welding flange is also called the high neck flange, the rigidity is larger, it is suitable for the occasion with high pressure temperature.

Flange sealing Surface type has three kinds: Plane seal surface, apply to the pressure is not high, medium non-toxic occasions, concave and convex sealing surface, suitable for the occasion of a slightly higher pressure;

Tenon Groove sealing surface, suitable for flammable, explosive, toxic medium and high pressure occasions.

The Butt welding flange gasket is a kind of ring which can produce plastic deformation and has certain strength. Most of the gaskets are from non-metallic plates, or by professional factories according to the size of the production, its materials for asbestos rubber plate, asbestos Board, polyethylene board, etc.

Also useful thin metal plate (tin, stainless steel) will be asbestos and other non-metallic materials wrapped up in the metal gasket; There is also a wound gasket made from a thin steel strip and asbestos band.

The ordinary rubber gasket is suitable for the occasion that the temperature is less than 120 ℃; asbestos rubber gasket is suitable for the water vapor temperature below 450 ℃, the oil temperature is below 350 ℃, the pressure is below 5MPa, for the general corrosive medium, the most commonly used is the acid-resistant asbestos board.

In high-pressure equipment and piping, the use of copper, aluminum, 10th # steel, stainless steel lens or other shape of the metal gasket.

The contact width of the high pressure gasket and the sealing surface is very narrow (line contact), and the sealing surface and the gasket are machined with higher finish.

Low-pressure small diameter with wire flange, high pressure and low pressure large diameter is the use of welding flange, different pressure flange thickness and connection bolt diameter and quantity is different.