Small Diameter Concrete Gravity Sewer Pipes

[br529]

I'm working on a gravity sewer replacement project in which we're replacing existing 8" and 10" concrete sanitary sewer pipes. I assumed that they were RCP, however, in trying to research pipe dimensions I haven't been able to find any information on RCP pipe less than 12" in diameter. Was 8"-10" RCP ever produced and they just don't make it any more or are these pipes likely AC/transite?

 

[fel3]

I've never seen RCP smaller than 12" either. I suspect that you're dealing with asbestos cement pipe ("Transite" was the trade name used by Johns Manville for their ACP). Because asbestos cement dust is hazardous, extra care will be required for its removal.

 

[swazimatt]

if they are AC pipes you will need to try remove them in full sections, no cutting. Here we also are required to consider the surrounding bedding to be contaminated as well.

There are options to re-line them with an eppoxy sleeve, or other options which is less intrusive and less H&S issues

 

[coloeng]

Could they be vitreous clay pipes? I know in my younger years that some system used the clay pipes in those smaller diameters for sewer mains.

 

[br529]

No they're not clay. We have CCTV and can tell that they're concrete. We actually believe that they're nonreinforced concrete pipe (ASTM C14) which seems to available in the 8"-10" diameter range.

 

[jhnblgr]

Post photos of the cctv

 

[xxKingDiamondxx]

could be cement line ductile iron pipes. However, age of the pipe would give you a clue of what they are. Does the owner have a gis system with that information. I also concur that they could be AC pipes.