Flat steel flanges GOST 12820-80 Pn 2.5

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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 58.00 0 0 0.29
DN 20 75.00 0 0 0.45
DN 25 84.00 0 0 0.55
DN 32 117.00 0 0 0.79
DN 40 142.00 0 0 0.95
DN 50 166.00 0 0 1.04
DN 65 199.00 0 0 1.39
DN 80 283.00 0 0 1.84
DN 100 350.00 0 0 2.14
DN 125 450.00 0 0 2.6
DN 150 565.00 0 0 3.43
DN 200 725.00 0 0 4.73
DN 250 958.00 0 0 6.95
DN 300 1266.00 0 0 9.33
DN 350 1679.00 0 0 10.45
DN 400 1944.00 0 0 11.64
DN 500 3346.00 0 0 16.0
DN 600 5018.00 0 0 21.35
DN 800 10024.00 0 0 36.63
DN 1000 14541.00 0 0 52.58
DN 1200 22128.00 0 0 62.36

Flat steel flanges PN 2,5, 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 80 55 40 19 8 4-10
20 90 65 50 26 10 4-10
25 100 75 60 33 10 4-10
32 120 90 70 39 10 4-12
40 130 100 80 46 10 4-12
50 140 110 90 59 10 4-12
65 160 130 110 78 11 4-12
80 185 150 128 91 11 4-16
100 205 170 148 110 11 4-16
125 235 200 178 135 13 8-16
150 260 225 202 161 13 8-16
200 315 280 258 222 15 8-16
250 370 335 312 273 18 12-16
300 435 395 365 325 18 12-20
350 485 445 415 377 18 12-20
400 535 495 465 426 18 16-20
500 640 600 570 530 20 20-20
600 755 705 670 630 20 20-24
800 975 920 880 820 21 24-27
1000 1175 1120 1080 1020 25 28-27
1200 1400 1340 1295 1220 25 32-30
Parameter name Indicator
Nominal pressure PN, MPa (kgf/cm²) 0.25 (2.5)
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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