Chapter 6 Water Supply and Distribution

Fixture Unit

What is the meaning of “FU”

6.895 Kpa

1 Psi =____ (Kpa)

10 WSFU

What is the WSFU of Water Closet (Flushometer valve 25mm) - Public use?

flush tank or flushometer valve

Water closets and urinals shall be flushed by means of an approved ___ or ______

57 mm

The minimum airgap of Sinks, laundry trays, gooseneck bath faucet and other fixtures with effective openings not greater than 19 mm in diameter, when affected by side walls.

Approved backflow prevention device assembly.

Such equipment or mechanism may be permitted only when equipped with an

6 WSFU

What is the WSFU of Water Closet (Flushometer valve 25mm) - Private use?

0.3 m

The water pipe shall be placed on a solid shelf excavated at one side of the common trench with a minimum clear horizontal distance between the sides of at least __ from the side of sewer or drain line and the water line

Fullway gate valve

A valve used to control two 2 or more openings shall be

Atmospheric Vacuum Breaker (AVB)

Consists of:

a body,

a checking member and

an atmospheric opening

Administrative Authority or other agencies

No water piping supplied by any private water supply system shall be interconnected to an approved city water supply system or any other source of supply without the approval of the

38 mm

The minimum airgap of Lavatories and other fixtures with effective openings not greater than 13 mm in diameter, when affected by side walls.

6 WSFU

What is the WSFU of Water Closet (Flushometer valve 19mm) - Public use?

Double Check Valve Backflow Prevention Assembly (DC)

Consists of :
2 independently acting internally or externally loaded check valves,

4 properly located test cocks with connectors and

2 isolation gate valves.

0 to 63.5 cm

Airgap less than 25 mm shall only be approved as a permanent part of a listed assembly that has been tested under actual backflow conditions with vacuums of from __ to __ of mercury

Pressure relief valve

What is the meaning of PRV?

Pressure Vacuum Breaker Backflow Prevention Assembly (PVB)

Consists of :

a loaded air inlet valve,

an internally loaded check valve,

2 properly located test cocks and

2 two isolation gate valves.

3 WSFU

What is the WSFU of Water Closet (Flushometer valve 19mm) - Private use?

51 mm

minimum airgap for over rim bath fillers and other fixtures with effective openings not greater than 25mm in diameter, when not affected by side walls.

0.3m

Unions shall be installed in the water supply piping within ____ away from regulating equipment, water heater, conditioning tank and similar equipment which require removal for servicing or replacement.

Galvanized

All small-sized malleable iron water fittings shall be ____

5 WSFU

What is the WSFU of Urinal (wall) - Public use?

305 mm

Access and clearance shall require minimum of ___ space between the lowest portion of the assembly and the grade, floor or platform.

Applies to DC, PVB, AND RP

Reduced Pressure Principle Backflow Prevention Assembly (RP)

Consists of:

2 independently acting internally loaded check valves,

a differential pressure relief valve,

4 properly located test cocks and

2 isolation gate valves.

2 pipe diameters, 25 mm

Where potable water is discharged to the drainage system, it shall be by means of an approved airgap of _______ from the supply outlet and the top surface of the drainage inlet, but in no case shall the gap be less than _____

3 WSFU

What is the WSFU of Water Closet (Flushometer tank) - Private use?

5 WSFU

What is the WSFU of Water Closet (Flushometer tank) - Public use?

152 mm

Connection may be made to the inlet side of a trap provided that an approved atmospheric vacuum breaker is installed not less than ___ above the flood level rim of such trapped fixture.

Atmospheric vacuum breaker

Water Closet and Urinal Flushometer Valves shall be equipped with a listed -

25mm

In cases where the ballcock has no hush tube, the bottom of the water supply inlet shall be installed ____ above the full opening of the overflow pipe.

0.3 m

The bottom of the water pipe at all points, shall be at least ___above the top of the sewer or drain line

25 mm

The ballcock shall be installed with the critical level at least __ above the full opening of the overflow pipe.

airgap

Water supply inlets not protected by atmospheric vacuum breakers shall be protected by

“DANGER-UNSAFE WATER”

Each outlet on the non-potable water line, which may be used for drinking or domestic purposes, shall be posted:

2 WSFU

What is the WSFU of Drinking Fountain (Public use)?

Backflow preventers

Shall not be located in any area containing fumes that are toxic, poisonous and corrosive.

4 feet (1.219m)

Support all piping at intervals of not more than ____ at end of branches, and at change of direction or elevation

Galvanized

Cast iron fittings up to and including 51 mm in size, when used in connection with potable water piping shall be ____

0.3m

All water service yard piping shall be at least ___ below the finish ground level.

8%

Water pipes and fittings with a lead content that exceed ___ shall be prohibited and not used in potable piping systems.

Cast iron or Brass

material for valves sizes over 51 mm may be

Fullway gate valve

A valve controlling all outlets shall be installed on the discharge side of each water meter and on each unmetered water supply.

1.52 meters

Installations elevated more than ___ above the floor or grade shall be provided with a permanent platform capable of supporting a tester or maintenance person.

accessible

All required shutoff or control vales shall be

Burred ends

Shall be reamed to the full bore of the pipe or tube.

Copper tubing

Shall be fully externally protected with bitumastic coatings and fiberglass wrapping and installed inside a split rigid casing whenever installed underground.

51 mm

The minimum airgap of Over rim bath fillers and other fixtures with effective openings not greater than 25mm in diameter, when not affected by side walls.

Inspected, Tested and Approved

No water supply system or portion thereof, shall be covered or concealed until it has been first -

19 mm

No building water service pipe shall be less than ___ in diameter.

3 feet (0.914m)

Support trap arms in excess of ____ in length as close as possible to the trap.

Supports

Shall allow free movement, but shall restrict upward movement of lateral runs to avoid reverse grade.

1 WSFU

What is the WSFU of Lavatory -Private use?

backflow or cross connection

running water must be in clean and healthful condition without danger of _____ or _____

103 kpa or 15 psi

minimum water supply pressure that should be reached,

elevated tank, booster pump

if minimum water supply pressure is not reached, an ____or ____must be installed

551 kpa or 80 psi

if the pressure is in excess of ___ kpa, pressure regulator preceded by an adequately sized strainer shall be installed

80%

all pipe size determinations shall be based on ____ of the reduced pressure

1033 kpa or 150 psi

maximum pressure setting of pressure relief valve

55.16 kpa or 8 psi

minimum pressure for a group containing flush tanks

9.79

multiplier to the elevation in meters to arrive at the loss in static pressure

3m/sec

maximum velocity of water given in the appropriate installation standard

expansion tank

for thermal expansion, _______ shall be installed whenever building supply pressure is greater than the required relief valve pressure setting

0.15 m to 0.60m

the height of end of pipe with relief valves above ground should be between ___ to ____

drainpipe

kind of pipe that should not be trapped (note: di nako gets ngano di pwede, pero nakabutang siya sa page 27 sa whitebook. feel nako should not be tapped)

threaded nor capped

the terminal end of drainpipe shall not be

Combination Temperature and Pressure Relief valve

meaning of CT & PRV

water heating, drain

Combination Temperature and Pressure Relief Valve shall be installed on the ______ device and shall be provided with a _____

75%

may be used as multiplier to hot-water supply when combining hot and cold water demand

25 mm

The minimum airgap of Lavatories and other fixtures with effective openings not greater than 13 mm in diameter, when not affected by side walls.

38 mm

The minimum airgap of Sinks, laundry trays, gooseneck bath faucet and other fixtures with effective openings not greater than 19 mm in diameter, when not affected by side walls.

76 mm

minimum airgap for over rim bath fillers and other fixtures with effective openings not greater than 25mm in diameter, when affected by side walls.

2x the Effective Opening

minimum airgap for effective openings not greater than 25 mm when not affected by side walls

3x the Effective Opening

minimum airgap for effective openings not greater than 25 mm when affected by side walls

43.3°C

minimum temperature for a backflow prevention for hot water to operate

2

number of separation walls of potable water from fluids or gases, with vented leak detection path

152mm

height of critical level above the overflow rim of the water closet or the highest part of a urinal

discharge

vacuum breakers of a water closet and urinal flushometer valves shall be at the _____ side of the flushometer valve

152mm

the critical level for AVBs installed on the discharge side of the last valve for inlets to tanks, vats, sumps, and swimming pools; for potable water outlets with hose attachments above the highest point of use; and for water inlets to water-supplied aspirators above the aspirator unit.

lawn sprinkling system

this system must have AVB

LOW AND HIGH HAZARD B.S.
[low hazard (pollution) and high hazard (contamination) back siphonage

When can an Airgap be used as a backflow prevention method?

LOW AND HIGH HAZARD B.S.
[low hazard (pollution) and high hazard (contamination) back siphonage

When can an AVB be used as a backflow prevention method?

LOW HAZARD B.S. and B.P.
[low hazard (pollution) back siphonage and back pressure)

When can a Double Check Valve Backflow Preventer (DC) be used as a backflow prevention method?

LOW AND HIGH HAZARD B.S.
[low hazard (pollution) and high hazard (contamination) back siphonage

When can a Pressure Vacuum Break (PVB) be used as a backflow prevention method?

LOW HAZARD B.S. and B.P. and HIGH HAZARD B.S. and B.P
[low hazard (pollution) back siphonage and back pressure

and high hazard (contamination) back siphonage and back pressure

When can a Reduced Pressure Principle Backflow Preventer (RP) be used as a backflow prevention method?

LOW AND HIGH HAZARD B.S.
[low hazard (pollution) and high hazard (contamination) back siphonage

When can a Spill-Proof Pressure-type Vacuum Breaker be used as a backflow prevention method?

brass

valve material for valve size up to 51 mm

discharge piping

location of a fullway gate valve required in relation to water supply tanks?

cold water supply pipe

location of a fullway gate valve required for a water heater?

control gate valve

this valve should be installed before each water-supplied appliance, slip joint, supply pipings for non-metallic fixture and appliance

automatic metering valve

control gate valve shall be installed in a water supply line ahead of any _____ which supplies a battery of fixtures

elevated or gravity storage tank

this tank shall be covered to keep out unauthorized persons, dirt and vermin

return-bend vent pipe, down-feed riser

gravity tanks shall be covered with ______ not less than area of ______

14-18 mesh per 25mm

the vent of a gravity supply tank shall be screened with a fine corrosion-resistant screen with opening of

float valve

____ valve must control the potable water inlets to gravity tanks

drain and overflow

gravity tanks shall be provided with a valved ______ and ___ pipe