What are the high requirements of pressure vessels for flanges?

As a pressure vessel, it must have the following characteristics, such as high-temperature resistance, corrosion resistance, leakage prevention, and easy repair.

However, the flange interface of a pressure vessel is usually the only channel for handling materials and the interface for connecting to other facilities.

The tightness of the butt joint seal of the pressure vessel must be guaranteed for a long time for each pressure vessel. The precision of the seal groove on the flange end face and the quality of the material has a more direct impact on the sealability.

First of all, under the premise of ensuring the accuracy of the sealing groove on the flange end face and the quality and performance of the material, the sealing strip in the sealing groove must have sufficient extrusion force to achieve the sealing effect.

When the flange aperture is large, the medium in the container is At high temperature, high pressure, and strong corrosion and corrosion, cracks are easily formed in the sealing groove of the flange end face of the container.

In order to inhibit the expansion of cracks, the pressure vessel should be maintained regularly, and the metal layer that has cracked in the sealing groove of the flange end face should be screened out and repaired.

Can effectively prevent leakage, explosion and other accidents.

If cracks occur in the sealing groove of the flange end face of the pressure vessel, there are two repair situations according to the size of the cracks: one is that only the surface layer has cracks, which have little effect on the transition layer.

The repair process is: eradicate the cracked surface layer → reinstall Overlay welding corrosion-resistant surface metal→flaw detection→machining sealing surface;

The other is that the crack has grown to the transition layer metal or even the base metal. The repair process is: eradicate all metal layers with cracks → surfacing the transition layer metal → heat treatment → flaw detection → surfacing corrosion-resistant surface metal → Flaw detection → machining sealing surface.

In addition, the repair process is also very important in the use and maintenance of flanges, because some small cracks can be improved through correct repair methods, and there is no need for major repairs.

The neck flange connection or flange joint refers back to the detachable connection of the flange, Gasket and bolt as a group of combined sealing structures.

Pipe flange refers back to the flange used for piping in the pipeline installation, And used on the equipment refers to the inlet and outlet flange of the equipment.

There are holes in the flange, and the bolts tightly connect the two flanges. When the water pump and valve are connected to the pipeline, some parts of this equipment are also made into corresponding flange shapes, also known as flange connections.

The butt welding flange produced by the butt welding flange adopts certain technical parameters and requirements for production and use during production and production.

So as to ensure that it can be used and promoted according to certain methods and principles, and adopts certain process methods and principles for production and use.

Welding strictly guarantees good quality in use.