1, divided by material:

Carbon Steel: ASTM / ASME A234 WPB, WPC

Alloy: ASTM / ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP911, 15Mo3 15CrMoV, 35CrMoV

Stainless steel: ASTM / ASME A403 WP 304-304L-304H-304LN-304N

ASTM / ASME A403 WP 316-316L-316H-316LN-316N-316Ti

ASTM / ASME A403 WP 321-321H ASTM / ASME A403 WP 347-347H

Low temperature steel: ASTM / ASME A402 WPL3-WPL 6

High Performance Steel: ASTM / ASME A860 WPHY 42-46-52-60-65-70

Cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, Arbitret, PVC, PPR, RFPP (enhanced polypropylene) and so on.

Aluminum 3003,6061, copper, copper, brass

2, divided by the production method can be divided into pushing, suppression, forging, casting and so on.

3, to create the standard division can be divided into national standard, electric standard, ship standard, standard, water standard, American standard, German standard, Japanese standard, Russian standard.

4, according to its radius of curvature to points: can be divided into long radius elbow and short radius elbow. Long radius elbow refers to its radius of curvature equal to 1.5 times the outer diameter of the pipe, that is, R = 1.5D; short radius elbow refers to its radius of curvature equal to the outer diameter of the pipe, that R = 1.0D. (D is the elbow diameter, R is the radius of curvature).

5, according to the pressure level to points: about 17 species, and the United States is the same pipe standards are: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, SCH100, Sch120, Sch140, Sch160, XXS; the most commonly used are STD and XS.

There are two main international standards for pipe flanges, that is, the European pipe flange system represented by the German DIN (including the former Soviet Union) and the American pipe flange system represented by the American ANSI pipe flanges. In addition, there are Japanese JIS pipe flanges, but generally only used for public works in petrochemical plants, and has a relatively small international impact. Pipe flange is now introduced in various countries under the following:

1, to the German and the former Soviet Union as the representative of the European system tube flange

2, American system tube flange standard, represented by ANSI B16.5 and ANSI B 16.47

3, the British and French pipe flange standards, the two countries have two sets of pipe flange standards.

Internationally accepted standards for pipe flanges can be summarized as two different and non-interchangeable pipe flange systems: a European pipe flange system represented by Germany; the other is the American pipe flange represented by the United States system.

IOS7005-1 is a standard issued by the International Organization for Standardization in 1992, which is actually a pipe flange standard that combines two series of pipe flanges from the United States and Germany.