Businessman attention of purchasing flange

When purchasing flange should be written clear the following contents:

Flange (flange cover) A B C-D E F

A, standard number:

According to ministry of chemical industry (HG) standard flange unified reported marked as: HG20592-97.

B, flange type according to the provisions of the code name a table.

C, flange nominal DN (mm).

D, flange PN nominal pressure (MPa).

E, seal face form according to the provisions of the code table 2.

F, material number.

Watch a flange type code:

Flange type flange type code

Format flat welding flanges PL

Take the flat welding flange SO

Take the butt weld flange WN

Overall flange IF

Socket weld flange SW

Thread flange Th

Butt weld ring loose set of flange PJ/SE

Flat welded loop loose set of flange PJ/PR

Flange cover BL

Lining flange cover BL (S)

Table 2 seal face form code:

Seal face form code

Tu face RF

Concave FM

Raised face M

Tenon face T

Slot face G

Whole plane FF

Ring LianJieMian RJ

Flange nominal DN (mm) sequence: 10, 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900, 1000, 1200, 1400, 1600, 1800, 2000.

Nominal pressure flanges PN (MPa) sequence: 0.25, 0.6, 1.0, 1.6, 2.5, 4.0, 6.3, 10.0, 16.0,


Example 1:200 mm, nominal nominal pressure 0.6 MPa, the metric system with this face plate flat tube welding steel pipe flanges, materials for Q235-A, notes for:

Flange HG 20592 PL200-0.6 RF Q235A

Example 2:300 mm, nominal nominal pressure 2.5 MPa, with the metric system of the tube with neck flat steel welded convex flange, material of 20 steel, notes for:

Flange HG 20592 SO300-2.5 M 20

Example 3:100 mm, nominal nominal pressure 10.0 MPa, the metric system of the tube with concave neck butt weld ends with steel pipe flanges, materials for 16 Mn, notes for:

Flange HG 20592 WN100-10.0 FM 16 Mn

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