(a)
Cross connections.
Potable and nonpotable water supplies
shall be distributed through systems entirely independent of each
other, and any cross-connection between such supplies is prohibited.
(b)
Backflow.
Every potable water outlet shall be protected
from backflow, preferably by having the outlet end from which the
water flows, spaced a distance from the flood level rim of the receptacle
into which the water flows, sufficient to provide a “minimum
required air gap” as listed in the table below:
|
Fixtures
|
Minimum Air Gaps
|
|---|---|
|
Lavatories with effective openings not greater than 1/2" in
diameter
|
1.0"
|
|
Sinks, laundry trays, and gooseneck bath faucets with effective
openings not greater than 3/4" in diameter
|
1.5"
|
|
Overrim bath fillers with effective openings not greater than
1" in diameter
|
2.0"
|
|
Effective openings greater than 1"
|
2 x effective opening
|
Where it is not possible to provide a minimum air gap,
then the fixture shall be equipped with an accessibly located backflow
preventer installed between the control valve and the fixture or outlet.
Such backflow preventer shall be of a design approved by the chief
plumbing inspector.
Where it is not possible to provide a minimum air gap or backflow
preventer, as may be the case in connections to cooling jackets, condensers,
or other industrial or special appliances, then the chief plumbing
inspector shall require a separate tank supply or such other means
of protection as may be practicable and desirable.
(c)
Water supply tanks.
All potable water supply tanks shall
be properly covered to prevent entrance of foreign material into the
water supply. Soil or waste lines shall not be permitted to pass directly
over such tanks or over manholes in pressure tanks.
(1965 Code, sec. 15-107)
All plumbing fixtures shall be provided with a sufficient supply
of water for flushing to keep them in a sanitary condition. Every
water closet or urinal shall be flushed by means of an approved tank
or flush valve of at least four (4) gallons flushing capacity for
water closets, and at least (1) gallon for urinals, and shall be adjusted
to prevent the waste of water. The flush pipe for water closet flush
tanks shall not be less than 1-1/4" in diameter, and the water from
flush tanks shall not be used for other purposes. The fixture supply
pipe to all closets and lavatories shall be provided with separate
stop cocks with renewal discs. Slip joints will not be permitted on
any supply line up to valve.
(1965 Code, sec. 15-108)
A group of urinals in the same room as in schools and factories
may be supplied from one automatic flush tank of a capacity equal
to one gallon of water to each urinal. Automatic flush must be simultaneous
and of such force as to cleanse each individual fixture. Intermittent
or automatic flushing devices shall be flushed at regular intervals
not to exceed ten minutes during the hours that such fixtures are
used. If wall urinals are used, one floor drain shall be installed
under the fixtures for each battery of one to three urinals. Walls
and floor of room in which urinal or urinals are located shall be
of nonabsorbent materials.
(1965 Code, sec. 15-109)
(a)
Residence
and apartment house water service lines sizes shall be installed in
accordance with the following table. Sizes set forth in this table
do not apply where flush valves are used.
|
Number of Fixtures
|
Length of Run
|
Size
|
|---|---|---|
|
1-5
|
up to 100'
|
3/4"
|
|
6-8
|
up to 50'
|
3/4"
|
|
6-8
|
from 50' to 100'
|
1"
|
|
9-10
|
up to 100'
|
1"
|
|
11-20
|
up to 50'
|
1"
|
|
11-20
|
from 50' to 100'
|
1-1/4"
|
For installations not covered by this table, the required
size of pipe shall be specified by the city plumbing inspector.
(b)
The
main water supply line to any building or bathroom shall not be smaller
than 3/4" pipe and not more than two fixtures shall be supplied by
1/2" pipe.
(c)
The
water service line shall be laid 18" below the surface of the ground
and where laid in the street or alley, the pipe shall not be laid
less than 22" below surface of the ground. Water pipe run under buildings
shall be 8" underground up to the point of risers. Under buildings,
water pipes may be supported to floor joists on pipe hangers provided
such pipes are covered with 3/4" thick wool felt or equal pipe covering
with canvas jackets and metal bands every 18". Fittings on suspended
pipes shall be covered with asbestos cement and wrapped in canvas.
Pipes on walls outside of buildings shall be covered with nonfrost
and antifreeze pipe covering of not less than 1" thickness and with
weatherproof jackets for protection against the elements. Fittings
shall be covered or wrapped with similar materials. Water pipes in
attics and garages and in the outside walls of buildings of other
than solid masonry construction and all hot water circulating systems
shall be covered with 3/4" thick wool felt pipe covering or other
approved covering having the same insulation value. Coverings on all
such pipe and fittings shall be installed in accordance with manufacturers
specifications.
(1965 Code, sec. 15-110)
Water connection for fire protection shall be made independent
of all other service pipes.
(1965 Code, sec. 15-111)
(a)
The
water service to each building where there is a bathroom and kitchen
sink and known as a residence shall be provided with an automatic
compression stop and drain cock with renewable disc of a pattern approved
by the city plumbing inspector. Such stop and drain shall be located
outside the house but not more than three (3) feet from the foundation
wall. On the house side of this valve there shall be a union and the
valve and union shall be housed in a box and cover in such a position
that valve or union may be removed for repairs or replacements. The
box shall be of cast iron not less than 15" x 22" x 12", or precast
reinforced concrete of circular design not less than 18" in diameter
by 15" deep. The cover for the concrete box shall be cast iron or
concrete reinforced with 2" x 2" by no. 12 welded wire mesh. A drainpipe
from hot water lines of 1/2" size shall be run to this same box, and
a compression stop cock shall be installed on this line and located
in the box.
(b)
In
a building where bathroom fixtures, kitchen sink and hot water heater
are installed back to back on the same partition wall and the hot
and cold water pipes are concealed in this partition and the hot water
pipe is installed in such manner as to completely drain the hot water
pipes through the bath cock, then a hot water drain will not be required
as heretofore specified.
(c)
Two
hose connections shall be provided for each residence; one in front
and one in the rear of the building. When sill cocks are used, they
may be controlled by the main cutoff as heretofore specified. When
yard hydrants are installed, each hydrant shall be controlled by a
compression stop and waste located at the base of each riser.
(1965 Code, sec. 15-112)
The water piping in apartments and multiple dwellings in buildings
not more than two stories in height shall be installed in accordance
with one of the following methods:
(1)
When a separate water meter is to be installed for each apartment, the installation shall be made in the same manner as described for residence water service. A separate valve box may be installed for each service line or the valves from several lines may be installed in one box, provided that the box is sufficiently large to accommodate all drain cocks and valves contained therein in such a manner that each valve may be removed or repaired without disturbing the other valves in the box. The temperature and pressure relief valve drain lines from not more than four water heaters may discharge to a common relief drain line. Such drain line shall be graded to drain, shall discharge outside the building as specified in section 3.05.308 and shall not be less than 3/4" in size when serving four (4) water heaters.
(2)
When
not more than three apartments are located in one building the water,
piping shall be installed as described in (1) above except that one
water meter may be used.
(3)
When one water meter is provided for a building serving four to twelve apartments, the water piping may be installed as described in (1) and (2) above or such piping shall be installed in the following manner: A main shut off valve and drain shall be installed on the main water supply to the building and located in a box as described for residence water service. Such valve and drain may be installed in a basement with a floor drain. All water risers shall be located in inside partition walls. Each fixture shall be provided with an individual compression stop cock accessibly located on hot and cold water supply only. All hot and cold water supply lines shall be covered with 3/8" thick insulation with materials as described in section 3.05.134. When a water heater is installed in each apartment the temperature and pressure relief valve drain line from not more than four (4) water heaters may discharge to a common relief drain line as specified in (1) above.
(4)
When
more than one apartments’ stop, and drain valves are placed
in a cutoff box, each valve shall be labeled with a permanent metal
tag fixed to the valve identifying the apartment controlled.
(5)
Plans
for the water supply systems for apartment buildings exceeding two
stories in height shall be submitted to the chief plumbing inspector
for approval.
(1965 Code, sec. 15-113)
Connections to and from hot water heaters shall not be smaller
than 3/4" pipe size. Hot water pipe shall not be less than 3/4" size
from heater to tee branch or the first fixture.
(1965 Code, sec. 15-114)
The fountain shall be constructed of impervious material, such
as vitreous china, porcelain, enameled cast iron, other noncorrosive
metals, or stoneware. The jet of the fountain shall issue from a nozzle
of nonoxidizing, impervious material set at an angle from the vertical
so as to prevent the return of water in the jet to the orifice or
orifices from whence the jet issues. The nozzle and every other opening
in the water pipe or conductor leading to the nozzle shall be above
the flood level of the bowl. The end of the nozzle shall be protected
by nonoxidizing guards. Guards shall be so designed that the possibility
of transmission of infection by touching the guards is reduced to
a minimum. The inclined jet of water issuing from the nozzle shall
not touch the guard. The bowl of the fountain shall be so designed
and proportioned as to be free from corners and shall be so proportioned
as to prevent unnecessary splashing at a point where the jet falls
into the bowl. The drain from the fountain shall have a direct physical
connection with a waste pipe, and the drain shall be properly trapped
and vented. The waste opening and drain shall be of sufficient size
to carry off the water promptly. The opening shall be provided with
a strainer. The water supply pipe shall be provided with an adjustable
valve fitted with a loose key or an automatic valve permitting the
regulation of the rate of flow of water to the fountain.
(1965 Code, sec. 15-115)
Every lawn sprinkler system shall be provided with a horizontal
swing check valve with a 45-degree seat installed between the water
meter and master shutoff valve for the system. Each such system shall
be provided with a means of draining and all such piping shall not
be less than 12" underground. A backflow preventer shall be installed
when required by the plumbing inspector.
(1965 Code, sec. 15-116)
Water wells, pumps, storage basins and appurtenances shall be
constructed and maintained in such a manner as to protect the water
from contamination and shall be constructed and maintained in accord
with the standards promulgated by the state board of health for water
supply systems. The well water supply system shall be inspected from
time to time by the city sanitary engineer or his authorized representative
who shall require that the said standards be complied with.
(1965 Code, sec. 15-117)
