This article is about Sanitary Sewer Manhole Installation & Inspection Checklist of Plumbing System as per international codes and standards.
Sanitary Sewer Manhole Installation & Inspection Checklist
Manholes shall be constructed of a nonmetallic material such as fiberglass-reinforced plastic (FRP), high density polyethylene, or equivalent, or concrete.
Concrete manholes shall be coated internally with APCS-19B epoxy, and externally below grade, with APCS-10 bituminous paint or better. (To be applied only after the leak testing of the manhole).
Steel reinforcing bars in concrete shall be epoxy coated as per 09-SAMSS-106.
Bottom of manhole shall have concrete benching , which must be channeled smooth from the invert of all pipes entering the manhole .
When there is a difference of more than 50mm to 600mm between the invert of incoming sewers, a chute shall be created in the benching to provide a smooth flow. Benching shall not be less ¾ of the diameter of the sewer pipe. Top of the benching must be sloped towards the open channel at the slope of 4% to 8%.
A drop manhole shall be provided for a sewer entering a manhole at an elevation of 600mm or more above the manhole invert. The drop connection shall be outside the drop manhole and shall be encased in concrete.
The maximum distance between manholes for public sewers shall be 90 meters (295 ft).
All force main connections to a gravity sewer system shall be through a manhole.
International Codes and Standard References for Sanitary Sewer Manhole Installation
1-SAES-S-010 – Sanitary Sewers.
Manhole Receiving, Handling, Storage and Preservation Inspection Checklist
Sanitary Sewer Pipe LayOut and Design Guidelines