Maximum Trench Widths One Foot Above Top
of Pipe
| ||
Pipe Size
(inches)
|
Trench Width
(inches)
| |
8 to 12
|
30
| |
15 to 18
|
OD plus 16
| |
21 to 27
|
OD plus 18
| |
30 to 36
|
OD plus 24
|
*
|
NOTE: "OD" is outside diameter of pipe barrel.
|