Flange Connection Operation Flow

The flange joint consists of a pair of flanges, a gasket and several bolt nuts.

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

A flange join is a detachable join. According to the connected parts can be divided into container flange and pipe method, according to the structural type, there is integral flange, live sleeve flange and threaded flange. Common overall Faran welding flange and butt weld flange.

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

Flange sealing Surface type has three kinds: The plane type seals the surface, is suitable for the pressure not high, the medium non-toxic situation, the concave-convex sealing surface, applies in the pressure slightly high occasion;

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

The Butt weld flange gasket is a kind of ring which can produce plastic deformation and has a certain strength material. 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, polyethylene board, etc.

Also useful thin metal plate (tin, stainless steel) asbestos and other non-metallic materials wrapped in metal packaging gasket; There is also a thin steel belt and asbestos belt around the system made of wound-type gasket.

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.

In high-pressure equipment and pipelines, the use of copper, aluminum, 10th steel, stainless steel made of lens-type or other shaped metal gaskets.

High-pressure gasket and sealing surface contact width is very narrow (line contact), sealing surface and gasket processing smoothness is higher.

Low-pressure small diameter wire flange, high pressure and low pressure large diameter are used welding flange, different pressure flange thickness and connection bolt diameter and number are different.