About АТК 26-18-12-96
АТК 26-18-12-96 is the gost standard which specifies the Threaded flanges for installation of thermometers, manometers and other measuring devices for corrosive media on Ru from 4.0 to 16.0 MPa. Design and dimensions
Альбом типовых конструкций устанавливает типы, пределы применения, конструкцию и основные размеры фланцев с резьбой для установки термометров, манометров и других измерительных приборов на сосудах, аппаратах блоков и трубопроводов для работы со средами, вызывающими скорость проникновения коррозии свыше 0,2 мм в год, а также для сред, вызывающих коррозионное растрескивание металла.
This album of typical constructions specifies the types, application limits, structure, and main dimensions of threaded flanges for the installation of thermometers, manometers, and other measuring instruments on vessels, apparatus, blocks, and pipelines for operation with media that cause a corrosion penetration rate of more than 0.2 mm per year, as well as for media that cause corrosion cracking of the metal.
Corrosion compensation allowance C=4 mm
Permissible stress σallow.=0.4σt
There are 4 types of flanges in АТК 26-18-12-96 standard
The structure and dimensions of Type I flanges shall comply with those shown in Figure I and Table I.

| Dy | D | D1 | D2 | d1 | d2 | d | h | h3 | h4 | b | Dm | Dn | Mass,kg |
| 25 | 115 | 85 | 68 | 18.43 | M20x1.5 | 14 | 36 | 18 | 2 | 14 | 45 | 33 | 1.3 |
| 40 | 145 | 110 | 88 | 24.17 | G 3/4 | 45 | 17 | 64 | 48 | 2.6 | |||
| 50 | 160 | 125 | 102 | 18.43 | M20x1.5 | 18 | 48 | 26 | 3 | 20 | 76 | 58 | 3.9 |
| 50 | 160 | 125 | 102 | 25.43 | M27x1.5 | 18 | 48 | 26 | 3 | 20 | 76 | 58 | 4 |
| 50 | 160 | 125 | 102 | 24.9 | M27x2.0 | 18 | 48 | 26 | 3 | 20 | 76 | 58 | 3.9 |
| 50 | 160 | 125 | 102 | 30.9 | M33x2.0 | 18 | 48 | 26 | 3 | 20 | 76 | 58 | 3.8 |
Material for АТК 26-18-12-96 thread flanges
- Carbon steel :СТ20; СТ.3, 09Т2С
- Stainless steel:12Х18Н10Т; 10Х17Н13М2Т,ASTM A182 F304L, F316/316L, F316H, F310, F321 F44
- Alloy steel:ASTM A182 F1, F5a, F9, F11, F12, F22, F91,15Х5М


