What type of casing pipe is acceptable at water and sewer crossings?
If the invert of the water main is not 18 inches above the crown of the sewer when the pipes cross, a casing pipe can be installed around either the water main or sewer in lieu of constructing the sewer with water main equivalent pipe. The casing pipe must be a material that is approved for use as water main. Concrete is not an acceptable encasement. The casing must extend on each side of the crossing until the normal distance from the water main to the sewer or drain is at least ten feet. For example, 30 feet of casing would be required for a 6-inch water main crossing an 8-inch sewer at a 45 degree angle. 9. Can the storm sewer be constructed with reinforced concrete pipe with a flexible gasket joint meeting ASTM C361 or ASTM C443 as an alternative to constructing the storm sewer with water main equivalent pipe at locations where it is not possible to meet the separation requirements? In parallel situations where local conditions prevent a ten foot separation the answer is no. At cro
