Section 6- Water Supply and Distribution Flashcards
Bateria and chemical quality of water supply shall comply with the department and
the Energy and Environment Cabinet
Dept of Environmental Protection
Division of Water KAR Title 401
When is a cross connection between private and public water supplies allowed?
Never
Which closed water devices would prompt the need for a thermal expansion tank installation and where
Single check valve-cold water supply near water heater
Backflow preventer-water distribution system
Pressure reducing valve w/out a bypass to a water heater-cold water line near water heater
What provides the best level of protection in all backflow situations
Air gap
Air gap is measured how
vertically from lowest end of potable water outlet to flood rim or line of fixture or receptacle
Minimum air gap shall be
twice the affective opening of potable water outlet
if outlet is less than 3x affective opening from wall or vertical surface, 3x the affective opening
Minimum air gap for lavs and drinking fountains not greater than 1/2in
1in or if near wall 1.5in
Minimum air gap for sink, laundry tray gooseneck bath faucet, not greater than 3/4in
1 1/2 or if near wall 2.25in
Minimum air gap for bath filler not greater than 1in
2 or if near wall 3
Minimum air gap for greater than 1in
2x effective opening or if near wall 3x
What provides best mechanical protection against backflow considered equivalent to an air gap?
Reduced pressure principle back pressure (RPZ)
Critical Level settings for Atmospheric Type Vacuum Breakers for cup beverage vending machines, lawn sprinklers, and steam tables vs everything else
12in above flood level vs 6in for everything else
Use of a barometric loop is not acceptables as
primary back siphonage preventer
Backflow preventer shall be in
in an accessible location from within the same room as fixture or connection it protects
may be installed in a utility or service space
not installed in location subject to flooding or freezing
How often should an RPZ be tested?
once a year
Name and define the 3 degrees of hazard
Severe-potential for contamination by toxic substance or disease causing organism
Moderate-potential for contamination by nontoxic but objectionable substance
Mild-potential for contamination by nontoxic, non-objectionable substance but may cause consumer to question the quality
Name some backflow preventers and there function with types of backflows and hazards.
RPZ-high hazard, backsiphonage and backpressure
Double check-low hazard, nontoxic, backpressure and backsiphonage
Dual check-low hazard, moderate flow requirement-post ground hydrant requirement
Dual check with atmospheric vent-moderate hazard, backpressure and backsiphonage
Lab faucet double check with vac breaker-moderate to low, backpressure and backsiphonage
AVB-atmospheric vacuum breaker-moderate to high hazard, 6in above fixture rim, backsiphonage only
PVB/SVB-moderate to high, 12in above overflow, backsiphonage only
A potable water opening outlet or connection, except _____, shall be protected against ________________
residential, backflow
A building used for habitation or occupancy shall be supplied with ____
A building used as residence or where people assemble or are employed ______ must be supplied
Potable water, both hot and cold water
Water service to a building shall
not be less than 3/4 of an inch
be of sufficient size to permit a continuous and ample flow of water to each fixture in the building
Plastic or nonconductive piping for water service needs
insulated copper tracer wire installed adjacent to the piping, access provided to the tracer wire within the building at main supply control, be not less than 18 AWG and be suitable for burial
Underground water service pipe from main or water supply system to water distribution system shall not be
less than 5ft apart horizontally from the house sewer and seperated by undisturbed or compacted earth unless…
bottom of water service pipe is at least 18in above top of the sewer at its highest
(water pipe) place on solid shelf excavated at one side of the common trench
number of joints is kept to a minimum
If water service pipe and sewer do intersect, _____shall be used on _______ extending _________. The sleeve shall be of __________ and must be _______ on each end.
a sleeve, water service pipe, 5ft on both sides of intersection, material approved for water pipe, sealed
The water supply shall be distributed through a piping system ______ of another piping system.
Independent
Nonpotable water piping rules
- piping used for any other purpose can’t be used for potable water
- nonpotable water can be used for flushing WC or urinal if piped independently
If dual water distribution is used then nonpotable water must be and how
durably and adequately identified
outlet must have permanant posting:DANGER UNSAFE WATER
each branch, fitting, valve identified NON POTABLE WATER by sign or brass tag perm fixed
identifying marking not concealed and maintained by owner
Hose connections other than those intended for ___________ shall be equipped with a _____________
clothes washers, frost proof burial hydrants, and water heater drain valve
vacuum breaker ASSE 1011 for nonfreezing areas and ASSE 1019 for freezing areas
A plumbing fixtures shall be provided with a _______ supply of water for _________
sufficient, flushing to keep them in sanitary condition
Tank of valves shall furnish at least __________________ to _________ of a water closet, urinal or similar fixture.
sufficient amount of water, thoroughly cleanse the surface area
A water closet, urinal valve should have ______ and be installed ______ to prevent polluting potable water through backsiphonage
vacuum breaker, above the fixture
A potable water connection to a boiler feed water where chemical is used shall be made how and where
through an air gap or a RPZ located in the potable water line before the point where the chemical is introduced
a boiler shall be equipped with ________ in ______
check valve, cold water supply to boiler
The orifice of a diring fountain shall be provided with ______ to prevent _____
a protective cowl, contamination of potable water supply
Min size for water serve from property line to water heater shall be
3/4in
hot and cold water piping shall extend 3/4in to
the first fixture branch
Limit on how many 1/2 fixture branched supplied from one 1/2 pipe
3
Concealed water branch pipe can be no less than what size
1/2in
Branch pipe to a fixture shall not terminate more than _____from ______
30 from point of connection to the fixture
Quick acting valve that causes noise due to water hammer, what should be installed and wher?
an air chamber or approved mech shock absorber as close as possible to the valve
Mechanical shock absorbers should be installed how
in an accessible place and by manufacturer’s specification of location and method
A joint in the water supply must be
screw, solder, or plastic joint
Type M copper or brass tubing or stainless shall be
wrapped with an approved material to permit expansion or contraction
PVC (water supply) shall not be used where
Below ground under a house or building
If CPVC used for water supply under a house or building, it should be tested to at least ___ before ______
100PSI
backfilling
Joint between ferrous piping and copper shall be made with
a dialectic fitting or other insulated fitting
A shower compartment or shower bath shall installed with a
temperature or pressure balance device
Main shutoff shall be provided where on the water service pipe
near the curb, in or near the meter box or property line
Main supply control valve shall be
a full port valve, accessible from within the occupied space, and provided with drip or drain valve
Potable water supply shutoff should not be in
a pit or similar installation
A family unit in a 2 family or multi family dwelling should be arranged with shutoff as to
shutoff one unit to be shutoff without interfering with supply of another unit or portion of the building
A fixture or group of bath fixtures shall be valved as well as ____________. In residential construction each ______ except _______ shall be valved __________
a lawn sprinkler opening, fixture, tub or shower, individually or as a group of fixtures
A group of fixtures shall include ________
2 or more fixtures adjacent to or near each other in the same room or back to back on a common wall
Cold water to hot water storage tank or water heater shall be provided with a shutoff valve located ________
near the equipment, in residential- placed within 3ft of the water heater and accessible from accessible side of the heater
A water service shall be installed at what depth
30in
A _________ shall be installed on a pneumatic water system.
relief valve
A private water supply or source shall be __________ and ______ shall be obtained from ____________ prior to using it.
protected from pollution
approval
the division
With an exception, a fire protection system using water from the potable water distribution system shall be equipped with
2 check valves, 1 of which may be an alarm check valve
