Dished heads for special type pipes have a radius of curvature greater than type D ones. This feature makes them particularly suitable for high internal pressure applications.
The dished heads are made of carbon steel with diameters between 76 mm and 430 mm.
| Øe mm | H mm | R mm | r mm | h* mm | S mm | V* dm³ | P* kg/mm |
|---|---|---|---|---|---|---|---|
| 76 | 36 | 40 | 15 | 8 | 4÷5 | 0,09 | 0,07 |
| 89 | 46 | 55 | 15 | 18 | 4÷5 | 0,18 | 0,11 |
| 108 | 48 | 63 | 14 | 14 | 4÷5 | 0,27 | 0,13 |
| 114 | 39 | 92 | 19 | 8 | 2÷3 | 0,25 | 0,13 |
| 133 | 58 | 88 | 25 | 19 | 4÷5 | 0,53 | 0,21 |
| 159 | 62 | 130 | 25 | 20 | 4÷5 | 0,85 | 0,29 |
| 168 | 68 | 120 | 30 | 1 | 4÷5 | 0,65 | 0,25 |
| 170 | 41 | 170 | 2 | 16 | 1,5÷2,5 | 0,58 | 0,25 |
| 188 | 80 | 150 | 35 | 28 | 2,5 | 1,59 | 0,43 |
| 194 | 75 | 155,2 | 29,8 | 25 | 3÷4 | 1,55 | 0,43 |
| 194 | 80 | 150 | 35 | 30 | 5 | 1,67 | 0,44 |
| 219 | 80 | 155 | 40 | 16 | 4÷6 | 1,99 | 0,5 |
| 244 | 93 | 190 | 40 | 28 | 4÷6 | 3,06 | 0,67 |
| 273 | 100 | 210 | 50 | 23 | 4÷6 | 4,06 | 0,8 |
| 324 | 120 | 270 | 60 | 32 | 4÷6 | 7,13 | 1,17 |
| 368 | 116 | 300 | 55 | 23 | 4÷5 | 8,47 | 1,33 |
| 430 | 155 | 380 | 65 | 51 | 4÷5 | 16,75 | 2,07 |
