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A sanitary sewer is an underground pipe or tunnel system for transporting sewage from houses and ... typically 1.5 to 4 inches (4 to 10 cm). ... increased water use ...
Each tunnel has a bore approximately 17 feet (5.2 m) in diameter, with the track centerline offset 8 inches (200 mm) towards the outside from the bore centerline. The tunnels flank a gallery which contains maintenance and control equipment in the upper gallery, including a pressurized water line for firefighting.
It is made from layers of ground wood pulp fibers and asbestos fibres compressed with and bound by a water resistant adhesive then impregnated with liquefied coal tar pitch. [ 1 ] [ 2 ] It was used from the 1860s through the 1970s, when it was replaced by PVC pipe for water supply and ABS pipe for drain-waste-vent (DWV) applications.
A trap primer automatically injects water into a trap, maintaining a water seal to keep sewer gas out of buildings. It must be installed in an easily accessible place for adjustment, replacement, and repair. A trap primer, a specialized valve, is usually connected to a clean-water supply in addition to a DWV system. [20]
A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.
An octagonal iron tank, 43 feet in diameter and 20 feet high was installed atop a 27-foot-high stone tower. Mains under Broadway and the Bowery delivered the water to hydrants on Pearl, William, Hudson, and a dozen other major streets, in six-, ten-, and twelve-inch pipes, delivering water to a height of 60 feet above the highest streets. [5]
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