TABLE OF CONTENTS The Owner shall supply the Contractor with all materials necessary for the completion of the Work specified herein, except where it is expressly stated that materials shall be furnished by the Contractor.
Steel casing pipe shall be employed when polyethylene pipe is traversing mainline railroad tracks or right of way, interstate highways or by the direction of the Engineer. Under railroads the casing pipe shall be 3 pipe sizes larger than the carrier pipe. At all other locations the casing pipe shall be 2-pipe sizes larger than the carrier pipe.
All steel casing pipe used in the Work shall, at a minimum, conform to API Standard 5L, Grade B specifications. Pipe shall not be primed, coated or taped.
The minimum required wall thicknesses for steel casing pipes are listed in Table A.1.
| Nominal Size (Inches) | Wall Thickness (Inches) |
|---|---|
| 30 | .406 |
| 28 | 0.377 |
| 26 | 0.344 |
| 24 | 0.312 |
| 22 | 0.281 |
| 20 | 0.281 |
| 18 | 0.250 |
| 16 | 0.219 |
| 14 | 0.188 |
| 12 | 0.188 |
| 10 | 0.188 |
| 8 and smaller | 0.188 |
When casing pipe is installed without cathodic protection, the wall thicknesses listed in Table A.1 shall be increased to the nearest standard size, or a minimum of 0.063 inch greater than the thickness shown. For casing pipes less than 12 inches nominal diameter, no wall thickness adjustment is required.
All pipe used for casing vents shall be two inch steel conforming to API Standard 5L, Grade B specifications.
