DN 450 PN 16 flange: dimensions, bolt circle and drilling (EN 1092-1)
The DN 450 PN 16 flange to EN 1092-1 is 640 mm (25.2 in) across, with 20 holes of 30 mm (1.18 in) on a 585 mm (23.03 in) bolt circle, for M27 bolts; the pipe is 457 mm (17.99 in) outside. The holes straddle the centre lines, the first one 9° off, and the chord between neighbouring holes, which is the divider setting for stepping the drilling out, is 91.5 mm (3.6 in).
Dimensions
| Outside diameter | 640 mm (25.2 in) |
|---|---|
| Bolt circle (PCD) | 585 mm (23.03 in) |
| Number of holes | 20 |
| Hole diameter | 30 mm (1.18 in) |
| Bolts | M27 |
| Pipe outside diameter | 457 mm (17.99 in) |
| Angle between holes | 18° |
| First hole from the centre line | 9° |
| Chord between neighbouring holes | 91.5 mm (3.6 in) |
Draw this flange: 1:1 template and DXF
Hole coordinates
From the centre of the flange, in mm, with the first hole 9° off the horizontal axis and the others counter-clockwise, as the standards lay the drilling out.
| Hole | Angle | x (mm) | y (mm) |
|---|---|---|---|
| 1 | 9° | 288.4 | 45.7 |
| 2 | 27° | 260.2 | 132.6 |
| 3 | 45° | 206.5 | 206.5 |
| 4 | 63° | 132.6 | 260.2 |
| 5 | 81° | 45.7 | 288.4 |
| 6 | 99° | -45.7 | 288.4 |
| 7 | 117° | -132.6 | 260.2 |
| 8 | 135° | -206.5 | 206.5 |
| 9 | 153° | -260.2 | 132.6 |
| 10 | 171° | -288.4 | 45.7 |
| 11 | 189° | -288.4 | -45.7 |
| 12 | 207° | -260.2 | -132.6 |
| 13 | 225° | -206.5 | -206.5 |
| 14 | 243° | -132.6 | -260.2 |
| 15 | 261° | -45.7 | -288.4 |
| 16 | 279° | 45.7 | -288.4 |
| 17 | 297° | 132.6 | -260.2 |
| 18 | 315° | 206.5 | -206.5 |
| 19 | 333° | 260.2 | -132.6 |
| 20 | 351° | 288.4 | -45.7 |
Questions
- How many bolts does a %{size} %{class} flange have?
- %{holes}, of %{bolt}, through holes of %{hole} on a %{circle} bolt circle.
- What is the bolt circle of a %{size} %{class} flange?
- %{circle}. The holes are %{angle}° apart, and the first one sits %{half}° off the centre line, so that two flanges mate in any symmetric position. The chord between neighbouring holes is %{chord}.
- Can a %{size} %{class} flange be cut from plate?
- As a plate flange, for low pressure: ducts, tanks, water lines. The outline and the drilling above are what the flange calculator draws, with the 1:1 template and the DXF for plasma or laser. A pressure flange to %{standard} is forged, with a hub and a raised face, and its thickness and facing come from the standard.