Welding technology: 1. Tack welding Tack welding must be carried out by welders with corresponding qualification certificates. The surface and both sides of the base metal near the weld shall be uniform and smooth without burr, crack, oxide scale, rust, grease, water and other impurities. The thickness of the positioned welding seam shall not be

Neck flange, also known as long neck flange and neck flange, is a disc-shaped part, which is mainly used to realize the connection between pipelines. It has been widely used in petrochemical, urban water supply and power system. In recent years, with the planning and construction of UHV transmission line project of State Grid, the

Generally, large flanges have relatively large load bearing capacity and are not easily deformed in engineering. The key problem is thickness. The inside and outside diameters of large flanges are not a problem, but the thickness of flanges is the most difficult to process. Large flanges are easy to deform if they are too thin.

1. When the upstream surface is corrosive medium, the gap can be sealed with sealing materials. See the atlas of waterproof casing for the method; Installation drawing of flexible waterproof casing (type A). 2. flexible waterproof casing material: Bituminous hemp, polystyrene board, PVC foam board. 3. Sealing paste: polysulfide sealing paste, polyurethane sealing paste. 4.

The forging of carbon steel elbow is the production and processing method of applying forging equipment to pressure the blank of metal material to cause plastic deformation, so as to obtain steel castings with physical properties, appearance and specifications. Forging is a common forming method in mechanical equipment manufacturing. The physical properties of steel castings

International working women’s day, fully known as “UN women’s rights and international peace day”, also known as “March 8” women’s day in China, is a festival established by the United Nations on March 8, 1975 to celebrate the important contributions and great achievements made by women in the economic, political and social fields. On this

Stainless steel pipe fittings are all kinds of stainless steel pipe joints. They are easy to install, high performance and durable. They are widely used in various pipeline construction and installation. So, how to install stainless steel pipe fittings? 1. The arc initiation of stainless steel pipes is by reflow method, and the arc closing is by