Continua
Civil/Environmental
- Feb 12, 2013
- 1
I'm new to this forum, and I apologize in advance if this question has already been answered. I'm designing a 36-inch ductile iron gravity sewer line with several aerial crossings in the range of 20 to 60 ft each. These crossings pass over small waterways and we have a nationwide 404 permit to install.
For the longer crossings, we plan to use steel pipe to avoid the need for intermediate supports. Most crossing details I've seen show a steel casing pipe and internal carrier pipe configuration. Is there any reason we can't just make a single steel pipe crossing without a casing? In other words, the pipeline would transition from ductile to steel at each end of the crossing.
For the longer crossings, we plan to use steel pipe to avoid the need for intermediate supports. Most crossing details I've seen show a steel casing pipe and internal carrier pipe configuration. Is there any reason we can't just make a single steel pipe crossing without a casing? In other words, the pipeline would transition from ductile to steel at each end of the crossing.
