Flat steel flanges GOST 12820-80 Pn 25

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Flat steel flanges GOST 12820-80
Nominal diameter Price, UAH without VAT Availability in warehouse, pcs. Reserve, pcs. Weight, kg
DN 15 101.00 10 0 0.7
DN 20 134.00 20 0 0.98
DN 25 160.00 0 0 1.17
DN 32 227.00 418 0 1.77
DN 40 318.00 87 0 2.18
DN 50 353.00 74 0 2.71
DN 65 419.00 197 0 3.22
DN 80 494.00 10 0 4.06
DN 100 713.00 95 0 5.92
DN 125 912.00 0 0 8.26
DN 150 1244.00 94 0 10.12
DN 200 1665.00 35 0 13.34
DN 250 2360.00 38 0 18.9
DN 300 2927.00 25 0 23.9
DN 350 4024.00 0 0 34.35
DN 400 5451.00 15 0 44.62
DN 500 9957.00 12 0 67.3
DN 600 13836.00 4 0 90.9
DN 800 27253.00 12 0 181.5

Flat steel flanges PN 25, corresponding to the standard GOST 12820-80, are steel welded elements intended for connecting pipelines, pipeline valves and equipment. Flanges are used to create detachable connections, which simplifies the inspection, cleaning of the pipeline, and replacement of equipment.

Design of the flat flange is a detail of circular (sometimes rectangular) shape with evenly spaced holes along the outer edge. These holes are used for fastening studs or bolts, providing a reliable and tight connection. Flanges are used in pairs: they are put on the pipe and welded around the perimeter of the connection.

Designation in technical documentation

Flanges are designated as follows:
Example: “1-80-10 St.20”, where:

  • “1” — number of product version;
  • “80” — nominal bore (DN), mm;
  • “10” — nominal pressure (PN), kgf/cm²;
  • “St.20” — steel grade.

Areas of application

Flanges GOST 12820 are used in various systems:

  1. Connection of pipeline fittings with pipelines.
  2. Joining separate sections of pipelines to each other.
  3. Connecting pipelines to equipment (e.g., tanks or devices).

Flange connections are in demand due to their ease of installation/dismantling, tightness, and high strength.

DN D D1 D2 b Z-Ød
15 95 65 47 19 14 4-12
20 105 75 58 26 16 4-12
25 115 85 68 33 16 4-12
32 135 100 78 39 18 4-16
40 145 110 88 46 19 4-16
50 160 125 102 59 21 4-16
65 180 145 122 78 21 8-16
80 195 160 133 91 23 8-16
100 230 190 158 110 25 8-20
125 270 220 184 135 27 8-24
150 300 250 212 161 27 8-24
200 360 310 278 222 29 12-24
250 425 370 335 273 31 12-27
300 485 430 390 325 32 16-27
350 550 490 450 377 38 16-30
400 610 550 505 426 40 16-33
500 730 660 615 530 48 20-33
600 840 770 670 630 49 20-39
800 1075 990 874 820 63 24-42
Parameter name Indicator
Nominal pressure PN, MPa (kgf/cm²) 2.5 (25)
Connection type сварной
Design features плоский
Execution 1
Working environment water, steam, non-aggressive liquids
Maximum working environment temperature, °C 300
Description Material
Фланец Сталь 20

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