Petrochemical pressure piping sae flange is a flange used to connect or assemble piping system components including piping fittings sae flange gasket fasteners valve joints hose trap filter separator and other flammable explosive high pressure piping

Petrochemical flammable and explosive high-pressure pipeline seals include flange sealing surface flange gasket and fastener The form of sae flange sealing surface includes plane concave surface, mortise and groove surface, special groove, etc. sae flange gasket includes plane gasket, wound gasket (with inner and outer rings) and metal gasket (oval octagonal)

Butt welded flanges meeting the following requirements:

A) There are no defects such as cracks, shrinkage cavities, slag inclusion and heavy skin;

B) The depth of corrosion depression and other mechanical damage that shall not exceed the negative deviation of wall thickness allowed by product standards;

C) The machining accuracy and roughness of the groove of the threaded sealing surface conforming to the requirements of design documents or product standards;

D) The welded joint shall be well formed and shall not have defects such as cracks, incomplete fusion and penetration, etc., and smooth transition with the base metal;

(e) Shipping parts or locating pin blocks such as metal bellows expansion joints spring supports and hangers shall be intact and free from loosening

Compliance of sae flange cover and flanging nipple can be judged by the following visual inspection:

a) The sealing surface should be flat and free from corrosion and radial scratches;

The approval mark shall be the outer edge of the flange and the flange cover;

c) It should be consistent with the quality certificate, product standard number, nominal size, nominal pressure, material and sealing surface type code.

Welding flanges are made by forging or forging. When using steel plate or section steel, follow the following process requirements:

Butt welding flanges should pass ultrasonic flaw detection and have no delamination defects;

2. The surface of the steel column is cut into strips, bent and welded into a ring, so that the steel surface forms a circular cylinder. Steel plates shall not be directly machined into neck butt welding flanges;

3. The full penetration welds should be circular butt welds;

4. The butt weld of the ring should be heat treated after welding, and subjected to ray or ultrasonic flaw detection. The ray flaw detection meets the secondary requirements of 4730, and the ultrasonic flaw detection meets the requirements of 4730.

There is a surface treatment process in the forging process, which is also a relatively critical step, in order to improve the surface quality of the product and the aesthetics of the product appearance. Many customers will use baking paint, electroplating and other methods in the later stage. In fact, adding the process of hot forging to remove oxides in the forging process can improve the surface quality of forgings, improve production efficiency and product competitiveness. Rolling dephosphorization equipment is a better choice. The method of using the impact force of high-pressure water dephosphorization principle to remove iron oxide scale is a current and effective method.