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All water supply pipes or distributing pipes that are installed in the ground in any public way or other public place or in buildings, structures, or privately owned premises shall be covered to a minimum depth of not less than 5 feet (1525 mm) below the surface of the ground. No ashes, cinders, or refuse shall be used in back-filling any trenches or excavations in which water pipes are installed. All such pipes shall be coated with coal tar paint and insulated where they pass through concrete floors, or new concrete or masonry walls.
No refrigerant condenser of the water jacket type with a common wall between the refrigerant gas and the cooling water shall be directly connected to the city water supply. Cooling water, if from the city water supply, shall be obtained by gravity through an indirect connection. If water under pressure is required, it may be supplied only by means of a reduced pressure backflow preventer.
Unused sections of water supply piping systems (or so called dead-ends) where city water will become stagnant are prohibited other than fire protection systems protected and installed in accordance with Table 18-29-608.1.
All new or newly remodeled refrigeration systems employing water from the city mains for condensing purposes in the process of providing space air conditioning for commercial, industrial or residential use shall be closed air conditioning systems employing recirculation of cooling water to conserve water.
Full-open valves shall be installed in the following locations:
1. On the building water service pipe from the public water supply near the curb;
2. On the water distribution supply pipe at the entrance into the structure;
3. On the discharge side of every water meter;
4. On the base of every water riser pipe in occupancies other than multiple family residential occupancies that are two stories or less in height and in one- and two-family residential occupancies etc.;
5. On the top of every water down-feed pipe in occupancies other than one- and two-family residential occupancies;
6. On the entrance to every water supply pipe to a dwelling unit, except where supplying a single fixture equipped with individual stops;
7. On the water supply pipe to a gravity or pressurized water tank;
8. On the water supply pipe to every water heater.
Shutoff valves shall be installed in the following locations:
1. On the fixture supply to each plumbing fixture except one- and two-family or multiple family residential occupancies, or individual guestrooms that are provided with unit shutoff valves in hotels, motels, boarding houses and similar occupancies;
2. On the water supply pipe to each sillcock;
3. On the water supply pipe to each appliance or mechanical equipment; and
4. On water services 1 1/2 inches (40 mm) or larger requiring meters either in the building or in a meter vault, valves shall be installed on the inlet and outlet sides of the meter and as near as practicable thereto. Meters on 1-inch (25 mm) services have a valve on the inlet side only. Valves located in the meter vault shall not eliminate the need for the valve in the building. All such valves shall be accessible for operation at all times.
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