What is a flange and how to measure a flange?

What is a flange?

Flange (flange) is a component of the piping system within the industry. Acts as an intermediary in the connection between the end of the pipe and the end of the pipe. Or between pipes and other equipment by flange welding is a removable flange connection with a gasket (Gasket) or O-ring (o-ring) and bolts connected together as a structure to act as a flange. stick together

standard flange

There are 3 types of flange standards.

  • ANSI (American National Standards Institute) - USA
  • DIN (Deutsches Institut für Normung) - GERMAN/EUROPE
  • JIS (Japanese Industrial Standard) - JAPAN/ASIA

1. ANSI standard flange divides the pressure range in PSI units.

Divided into 7 types of pressure ranges: ANSI 150, ANSI 300, ANSI 400, ANSI 600, ANSI 900, ANSI 1500, and ANSI 2500. The numbers refer to the pressure tolerance in PSI units.
For example, ANSI standard: ANSI 150 is a flange that can withstand a pressure of 150 PSI.

2. DIN standard flange divides the pressure range in bar.

Divided the pressure range into 5 types: PN 6, PN 10, PN 16, PN 25, and PN 40. The numbers refer to the pressure resistance in BAR units.
For example, PN standard: PN 16 is a flange that can withstand a pressure of 16 BAR.

3. JIS standard flange divided pressure range in kgf/cm2

The pressure range is divided into 8 types: JIS 2K, JIS 5K, JIS 10K, JIS 16K, JIS 20K, JIS 30K, JIS 40K, JIS 63K. The numbers refer to the pressure resistance in Kgc/cm2 or BAR.
For example, JIS standard: JIS 10K is a flange that can withstand a pressure of 10 Kgc/cm2 or 10 BAR.

How to measure flange

The picture shows the size and distance according to the flange standard (Flange Dimension) for inspecting the flange standard.

  • D (Flange Outside Diameter) is the outside diameter of the flange (Flange).
  • C (Bolt Circle Diameter) is the center distance of bolt flange holes on both sides.
  • h (Bolt Hole Diameter) is the diameter of the bolt flange hole.
  • N (Number of Bolt Hole) is the number of bolt flange bolts used per flange.
  • t (Flange Thickness) is the thickness of the flange (flange).

Compare different types of flanges.

We would like to give examples of each of 2 sizes or click to view more products.

Unit is : mm

Size ANSI Flange Standard
150P 300P
Mill finger D C h t N BS D C h t N BS
15 1/2" 88.9 60.3 15.9 11.1 4 M12 95.3 66.7 15.9 14.3 4 M12
20 3/4" 98.4 69.9 15.9 12.7 4 M12 95.3 66.7 15.9 14.3 4 M12
Size JIS Flange Standard
5K 10K
Mill finger D C h t N BS D C h t N BS
15 1/2" 80 60 12 9 4 M10 95 70 15 12 4 M12
20 3/4" 85 65 12 10 4 M10 100 75 15 14 4 M12
Size DIN Flange Standard
PN6 PN10
Mill finger D C h t N BS D C h t N BS
15 1/2" 80 55 11 12 4 M10 95 65 14 14 4 M12
20 3/4" 90 65 11 14 4 M10 105 75 14 16 4 M12