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Henrico's water main on Staples Mill Road dates to the 1950s, and had had emergency repairs completed on it many times in the 18 months before the outage. During these repairs, officials were able to replace leaking valves and install new valves, better allowing them to close off sections of the pipe if necessary. [26]
Much larger than tankless heaters, cold water is heated by a gas flame or an electric heating coil, both located at the base of the tank. Storage tank water heaters are expected to last about 10 ...
October 5 – A ditching machine used in laying a water main hit an 8-inch natural gas pipeline in Sarasota, Florida. Nine people were injured in the ensuing explosion and fire. [82] October 26 – A 16-inch gas transmission pipeline near Checotah, Oklahoma exploded while it was being worked on, to repair a leak. Three of the repair crew died ...
Class V valves leak less than 5 × 10 −12 cubic metres, per second, per bar of pressure differential, per millimetre of port diameter, of water when tested at the service pressure. Class VI valves are slightly different in that they are required (at 50 psi (340 kPa) or operating pressure, whichever is less) to have less than a specified ...
Cone valves or ball valves are another alternative. These are commonly found as the service shut-off valves in more-expensive water systems and usually found in gas taps (and, incidentally, the cask beer taps referred to above). They can be identified by their range of motion—only 90°—between fully open and closed.
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]
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