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Flange – basic knowledge of valve design and production

Posted by: steel world 2023-11-01 Comments Off on Flange – basic knowledge of valve design and production

Brief description of flange
Pipe flanges, their gaskets, and fasteners are collectively called flange joints. Flange joint is a component that is widely used in chemical engineering design and covers a wide range of areas. It is an indispensable part in piping design, pipe fittings and valves, and is also an essential component in equipment and equipment parts (such as manholes, sight glasses, liquid level gauges, etc.). In addition, other majors such as industrial furnaces, thermal engineering, water supply and drainage, heating and ventilation, automatic control, etc. also often use flange joints.

International pipe flange standard system:
There are two main systems for international pipe flange standards, namely the European pipe flange system represented by German DIN (including the former Soviet Union) and the American pipe flange system represented by American ANSI pipe flanges. In addition, there are Japanese JIS pipe flanges, but they are generally only used in public projects in petrochemical plants and have little impact internationally. Here is an introduction to pipe flanges in various countries:
1. The European system management flange represented by Germany and the former Soviet Union
2. American system pipe flange standards, represented by ANSI B16.5 and ANSI B 16.47
3. British and French pipe flange standards. Each country has two casing flange standards.
To sum up, the internationally accepted pipe flange standards can be summarized into two different and non-interchangeable pipe flange systems: one is the European pipe flange system represented by Germany; the other is represented by the United States. American pipe flange system.
IOS7005-1 is a standard promulgated by the International Organization for Standardization in 1992. This standard is actually a pipe flange standard that merges two series of pipe flanges from the United States and Germany.
The pipe flange connection dimensions of the two systems are different and cannot be matched with each other:
The pipe flanges of the two systems are most appropriately distinguished by pressure levels, that is, the European system is 0.25, 0.6, 1.0, 1.6, 2.5, 4.0, 6.3, 10.0, 16.0, 25.0, 32.0, 40.0MPa, and the American system is 1.0, 2.0 , 5.0, 11.0, 15.0, 26.0, 42.0MPa.

Current status of pipe flange standards in my country
Commonly used standards for pipe flanges used in my country’s chemical and petrochemical industries
1. British pipe (internationally common piping series) GB 9112~9125, SH 3406
2. Metric pipe (commonly used domestic steel pipe outer diameter size series) HGJ44~76, JB/T74~90


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