New Jersey Administrative Code
Title 5 - COMMUNITY AFFAIRS
Chapter 21 - RESIDENTIAL SITE IMPROVEMENT STANDARDS
Subchapter 7 - STORMWATER MANAGEMENT
Appendix A
CORRUGATED METAL PIPE STANDARDS
Corrugated metal pipe, when approved by the municipal engineer, shall meet the requirements and be installed in the following manner. Corrugated metal pipe for drainage structures is allowed in accordance with the map below. In areas with acid waters (shaded area on the map), design engineers may use aluminum alloy, provided the environmental limitations below are met. In neutral/alkaline waters (unshaded on the map), aluminum, aluminum-coated steel type 2, and polymeric-coated steel may be used, provided the environmental limitations below are met. Water pH and resistivity values must fall within the ranges shown below. Samples should be measured in accordance with ASTM G51 and G57. Avoid sampling water during storm events or for two days following a storm to insure more typical readings. If there are severe corrosive conditions (pH < 4), fiber-bonded steel pipe should be used.
| ENVIRONMENTAL LIMITS FOR CORRUGATED METAL PIPE | ||
| Pipe type | pH | Resistivity values (ohm-cm) |
| aluminum | 4-9 | > 500 |
| aluminum-coated type 2 | 5-9 | > 1500 |
| polymeric coated | 5-9 | > 1500 |
| fiber bonded | < 4 | -- |
If the design velocity is greater than 10 feet per second, a one-half bituminous coating and paved invert in accordance with ASTM A849 (AASHTO M190) is required.
Minimum depth of coverage shall be as follows:
| MINIMUM DEPTH OF COVERAGE FOR | |
| CORRUGATED METAL PIPE | |
| Minimum cover (inches) from top of pipe | |
| to bottom of flexible payment or top of | |
| Pipe diameter (inches) | rigid pavement |
| 12 inches to 48 inches | 12 inches |
| 54 inches of more | Per manufacturer's recommendations |
Corrugated aluminum pipe shall conform to the requirements of ASTM B745 (AASHTO M196) for types I, II, IR, IIR, and III.
Corrugated aluminum-coated steel type 2 pipe shall conform to the requirements of ASTM A760 (AASHTO M36) for types I, II, IR, IIR, ands III and have an aluminum-one ounce type 2 coating as specified in ASTM A929 (AASHTO M274).
Corrugated polymeric-coated steel pipe shall conform to the requirements of ASTM A762 (AASHTO M36) for types I and II and have a polymeric 10/10 coating as specified in ASTM A743 (AASHTO M246).
Corrugated fiber-bonded steel pipe shall conform to the requirements of ASTM A760 (AASHTO M36) for types I and II and have an aramid fiber composite coating as specified in ASTM A885. In addition, the pipe shall be bituminous coated as specified in ASTM A849 (AASHTO M190).
Corrugated metal pipe shall be fabricated with annual corrugations by riveted lap joint construction or with helical corrugations and a continuous weld or lock seam extending from end to end of each length of pipe.
Connecting bands shall be manufactured in accordance with ASTM A760 (steel) or B745 (aluminum) and have the same base metal and coating as the corrugated metal pipe. All pipe ends shall be annularly reformed a minimum of two corrugations.
Fittings and end sections shall be of the same base metal and coating as the corrugated metal pipe.
Corrugated metal pipe shall be installed per ASTM A798 (steel) or ASTM B788.
Maximum cover and structural design of corrugated metal pipe shall be per ASTM A796 (steel) or ASTM B790.
