Manufacturer of ATK 26-18-5-93 Steel spectacle blind Flanges
ATK 26-18-5-93 is a gost standard,specifies the Steel spectacle blinds for fitting flanges. Design, dimensions and technical requirements.
This standard applies to spectacle blinds for the nominal pressure from 1,6 to 16 MPa and temperature from -70 0 C to 475 0 C for chemical, oil-refining, petrochemical, gas, oil and other allied industries. Spectacle blinds are designed for operation in the environments which cause the corrosion rate of not more than 0,4 mm per year and also in the environments which cause the corrosion cracking of metal.
spectacle blind flanges (Figure 8)
A spectacle blind or spec blind, abbreviated as SB,funactional like a valve, is a safety device used to isolate a section of line or piece of equipment when the line or equipment needs to be inspected or removed from service. It is different than a valve in that the blind is a permanent or long term isolation device.
A spectacle blind is welded joint from a forged blind&ring to match the pipe size, fit between two pipe of flanges and requires an additional gasket when it is installed. Also, the bolts will need to be lengthened depending on what piping class and size blind is used. The thickness of the spectacle blind is specified based on the line pressure and pipe size.
The specification that determines the dimensions of a spectacle blinds is ATK 26-18-5-93 Line Blanks.
This album of typical constructions specifies three types of Rotary steel plug
- Type 1 – Rotary steel plugs with a raise face for a nominal pressure ranging from 1.6 to 4.0 MPa (drawing I, tables I–3);
- Type 2 – Rotary steel plug a male–female surface for a nominal pressure ranging from 4.0 to 10.0 MPa (drawing 2, tables 4–6);
- Type 3 – Rotary steel plug for an oval–section ring gasket for a nominal pressure ranging from 6.3 to 16.0 MPa (drawing 3, tables 7–9).
Raise face PN16 spectacle blind flange dimensions as per ATK 26-18-5-93
| Dy∗ | D | d1 | d2 | A | B | b | b1 | h | d | Mass,kg (not more than) |
| 80 | 133 | 78 | 76 | 160 | 50 | 12 | 16 | 2 | 10 | 2.5 |
| 100 | 158 | 96 | 94 | 180 | 60 | 12 | 16 | 2 | 10 | 3.5 |
| 150 | 212 | 146 | 142 | 240 | 70 | 14 | 18 | 2 | 10 | 6 |
| 200 | 268 | 202 | 196 | 295 | 75 | 18 | 22 | 2 | 10 | 12.5 |
| 250 | 320 | 254 | 244 | 355 | 80 | 21 | 25 | 3 | 16 | 20 |
| 300 | 370 | 303 | 294 | 410 | 80 | 22 | 28 | 3 | 16 | 28 |
| 350 | 430 | 351 | 344 | 470 | 80 | 24 | 30 | 3 | 16 | 41.5 |
| 400 | 482 | 398 | 390 | 525 | 80 | 26 | 32 | 3 | 16 | 55 |
| 500 | 585 | 501 | 490 | 650 | 85 | 30 | 36 | 4 | 20 | 90 |
| 700 | 800 | 692 | 680 | 840 | 100 | 37 | 45 | 4 | 20 | 206 |
Material for ATK 26-18-5-93 Steel spectacle blinds Flanges Rotary steel plug
CT20, 09G2S, 10G2, 16GS, 12X18H10T, 08X18H10T, 13XFA, 15X5M, 10X17H13M2T, 06XH28MDT, A105, A181, A182, A350, AISI 304, AISI 304L, AISI 316, AISI 316L, AISI 316Ti, AISI 321, etc.
