COLD WATER SUPPLY IN BUILDING

water

it is a combination of two chemical elements called hydrogen and oxygen

839

water in its liquid form is _______ times heavier than air

133

water in the form of vapor is __________ times lighter than air

pure or uncontaminated water

water that is not found in nature

entrained gases

impurities in water such as carbon dioxide, hydrogen sulfide, methane, oxygen and nitrogenous and organic compounds

dissolved minerals

impurities in water such as calcium, magnesium, sodium, iron and manganese

suspended and colloidal materials

impurities in water such as bacteria, algae, fungi, silt, protozoa and other colloidal matters making the water colored and acidic

radioactive materials

impurities in water by entrainment of radioactive substances from mining or processing ores

lead pipe

type of pipe that should not be used for distribution of soft acid water, or for hot water having a high concentration of dissolved oxygen or chlorides

100 m

wells that are supplying water for public use should be located at a minimum distance of ___________ radius from residential areas

15 m

there should be no concrete sanitary sewers existing within the ________ radius of the well

45 m

no outdoor privy, cesspools, septic tank or drain fields, shall be located within ____________ radius from the well

spring water

a very shallow well with water, taken from a water stratum composed of cervical limestone, sand or gravel, lying a few meters below the earth

direct pressure distribution

type of water distribution that obtain its supply of water through a large intake pipe, installed in the lake basin extended down the water

direct pressure distribution

in this type of water distribution, water is drawn from the lake, to a receiving well by force of gravity, passing through the filtration plant

indirect pressure distribution

type of water distribution wherein water drawn from a drilled distribution is done by indirect pressure

indirect pressure distribution

in this type of water distribution, a turbine pump is employed mounted on top of the standpipe extended down the well below the water table

house service

it refers to the pipe connection from the public water main or any source of water supply to the building served

riser

vertical supply pipe which extend upward from one floor to the next

branches

horizontal pipes that serve the faucets or fixtures

water main

it refers to the public water connection which are laid underground along the streets where the house service is connected

overhead feed system

type of cold water distribution that supplies water to the plumbing fixtures by means of gravity

overhead feed system

type of cold water distribution in which water is pumped to a large tank on top of the building and distributed the water to the different fixtures

air pressured water distribution

type of water distribution where compressed air is used as the delivery agent

10

air pressured water distribution system serves zones of about ______ storeys or floor intervals in buildings of extreme height

direct up-feed pumping system

it is an innovation of the air pressurized water distribution

direct up-feed pumping system

this type of water distribution is used on tall building that could not be served adequately by the street main

friction

it is the resistance produced by the flowing water with the fittings and interior surface of the pipe

pressure

force required to move the water inside the pipe

static pressure

pressure exerted by the water at rest

normal pressure

pressure range measured over a period of 24 hours

30 to 40 psi

normal pressure from residential house ranges from ____________

50 psi

water pressure greater than ________ may cause pipe hammering or bursting of pipe joints

pressure reducing valve

this valve will keep the pressure constant at 40 psi or can be reset to any other pressure desired

critical pressure

it refers to the maximum and minimum pressure at which proper function of the water supply system can be maintained

friction head loss

it is the loss in rate of flow, due to frictional between the water and the walls of the pipe

pressure loss

it refers to the variations in pressure between the water main and outlet end of the water service

maximum demand

it refers to the maximum water discharge of fixtures in terms of fixture units

probable demand or peak load

this is one of the factor to be considered in determining the size of the water service pipe

25%

probable demand is not likely to exceed ____ of the maximum demand, especially for average size residential buildings

20 mm

the size of water service pipe is based on the maximum and minimum probable water demand, but in no case shall it be less than _______ diameter

50 psi

public water distribution system usually has an average water pressure of _______ that is only adequate to serve building less than 5 storey high

piston pump

pump used on small water distribution system for elevating water in wells or other sources

centrifugal pump

pump associated with tall building water distribution system

gate valve

it is used to completely close or completely open the line but not necessarily to control the flow of water

wedged shape

type of gate valve used where the stem must be installed pointing downward

double disc valve

it closes same manner as the wedged type, except that its parallel forces drop in a vertical position

double disc valve

this type of valve is used in cold liquid and sewage disposal installation

globe valve

type of valve that is actuated by a stem crew, and hand wheel, suited on installation that calls for throttling

plug type disc valve

type of globe valve that has a wide bearing surface producing good resistance to the cutting effects of scale dirt and other kind of foreign matter found inside the pipe

conventional disc valve

type of globe valve that has a pressure tight bearing between the disc and the seat recommended for cold water and any temperature service

composition disc valve

type of globe valve that is used for various types of services on oil, gasoline, steam, and hot or cold water

angle valve

it operates in the same manner as the globe valve and it is used in making 90 degree turn in a line to reduce the number of joints

foot valve

it is located at the lower end of the pump used to prevent loss of priming the pump

foot valve

it is also known as retention valve

check valve

its main function is to prevent the reversal flow of gas or liquid in the line

safety valve

it is used on cold water water systems, heating systems, compressed air lines, and other pipelines with excessive pressure

corporation stop

it is inserted into the water main and it serves as a control of the water service and as a shut off when the service is disconnected

curb stop

it is installed between the curb and the sidewalk and it serves as control stop of the service between the curb and the building

curb stop

it shut off water supply in case the basement becomes flooded

meter stop

it is a controlling stop of the entire water supply in the building

water meter

it is a device used to measure the amount of water that passes through the water service