A plug is a device that is inserted into a sewer line to temporarily restrict flow into predetermined areas.
Blocking flow in a sewer pipe is necessary to perform maintenance and rehabilitation work on specific sections. Plugs are typically manufactured from rubber and can be procured in standard sizes or can be inflated with compressed air from an external source to fit the pipe diameter.
Trenchlesspedia Explains Plug
Plugs can be thought of as dams, which block the flow of water at specific pipe sections. They can be installed at two locations to block the upstream and downstream ends of the specific work location.
Plugs are installed by creating an opening at the top of the pipe and inserting the plug at the given location(s). With the flow temporarily obstructed, the section of pipe being worked on is drained. Once the work is completed, the plug is removed and the opening used to insert the plug is sealed.
There are a number of plugs that vary in shape and size for different situations. These include plugs for:
- Main sewers
- House connections
- High pressure flows etc.