| Internal Dia.(in) | MIN WALL | LB/FT |
|---|---|---|
| 4 | 5/8 | 9.5 |
| 6 | 5/8 | 17 |
| 8 | 3/4 | 27 |
| 10 | 7/8 | 37 |
| 12 | 1 | 50 |
| 15 | 1-1/4 | 80 |
| 18 | 1-1/2 | 110 |
| 21 | 1-3/4 | 160 |
| 24 | 2-1/8 | 200 |
| 27 | 3-1/4 | 390 |
| 30 | 3-1/2 | 450 |
| 33 | 3-3/4 | 520 |
| 36 | 4 | 580 |
These tables are based on concrete weighing 150 pounds per cubic foot and will vary with heavier or lighter weight concrete.
| Internal Dia.(in) | MIN WALL | LB/FT |
|---|---|---|
| 4 | 3/4 | 13 |
| 6 | 3/4 | 20 |
| 8 | 7/8 | 31 |
| 10 | 1 | 42 |
| 12 | 1-3/8 | 68 |
| 15 | 1-5/8 | 100 |
| 18 | 2 | 160 |
| 21 | 2-1/4 | 210 |
| 24 | 3 | 320 |
| 27 | 3-3/4 | 450 |
| 30 | 4-1/4 | 540 |
| 33 | 4-1/2 | 620 |
| 36 | 4-3/4 | 700 |
These tables are based on concrete weighing 150 pounds per cubic foot and will vary with heavier or lighter weight concrete.
| Internal Dia.(in) | MIN WALL | LB/FT |
|---|---|---|
| 4 | 7/8 | 15 |
| 6 | 1 | 24 |
| 8 | 1-1/8 | 36 |
| 10 | 1-1/4 | 50 |
| 12 | 1-3/4 | 90 |
| 15 | 1-7/8 | 120 |
| 18 | 2-1/4 | 170 |
| 21 | 2-3/4 | 260 |
| 24 | 3-3/8 | 350 |
| 27 | 3-3/4 | 450 |
| 30 | 4-1/4 | 540 |
| 33 | 4-1/2 | 620 |
| 36 | 4-3/4 | 700 |
These tables are based on concrete weighing 150 pounds per cubic foot and will vary with heavier or lighter weight concrete.