What are the classification and standard features of large anti-corrosion flanges

Anti corrosion measures such as oil coating and galvanizing are mainly adopted for large anti-corrosion flanges. Large anti-corrosion flange can be divided into vessel flange and pipe flange according to the connected parts; According to the structure type, there are integral flange, looper flange and threaded flange.

Radiation cross-linked polyethylene heat shrinkable tape anti-corrosion process is mainly used for large anti-corrosion flanges. Radiation cross-linked polyethylene heat shrinkable tape for steel pipe anti-corrosion is a new type of steel pipe weld anti-corrosion material with good performance and easy operation, which is composed of a double layer material of base material and hot melt adhesive layer. The main standards are SY / t0413-2002 technical standard for polyethylene anticorrosive coating of buried steel pipeline, SY / t4054-2003 radiation crosslinked polyethylene radiation crosslinked polyethylene heat shrinkable tape (set), SY / t0415-1996 technical standard for rigid polyurethane foam plastic anticorrosive insulation layer of buried steel pipeline. The material of large anti-corrosion flange is mainly carbon steel, which is suitable for oil and gas transmission engineering and chemical industry.

The production process of large anti-corrosion flange mainly includes forging, casting, cutting and rolling.

The main standards for large anti-corrosion flanges are GB/T 9114-2010 Necked Threaded Steel Pipe Flanges, GB/T 9115-2010 Butt Welding Steel Pipe Flanges, GB/T 9116-2010 Necked Slip on Welding Steel Pipe Flanges, GB/T 9117-2010 Necked Socket Welding Steel Pipe Flanges, and GB/T 9118-2010 Butt Welding Ring Necked Loose Sleeve Steel Pipe Flanges.

Large anti-corrosion flanges in the chemical industry mainly use heat shrinkable sleeve tape, which is designed for anti-corrosion of welded junctions of buried and overhead steel pipelines and thermal insulation and patching of insulated pipelines. It is compounded by radiation crosslinking polyolefin base material and special sealing hot melt adhesive. Large anti-corrosion flanges can be divided into pushing, pressing, forging, casting, etc. according to the manufacturing method. Large anti-corrosion flanges can be divided into national standards, electrical standards, ship standards, chemical standards, water standards, American standards, German standards, Japanese standards, Russian standards, etc. according to the manufacturing standards.