vent Flashcards by MIGUEL JORDAN TANGONAN

also called as the “Waste Waterline system”
, which primarily responsible in properly
disposing waste water towards its point of disposal i.e. septic tank, public sewer line.
-composed of three subsystems which are responsible in the over-all function of the
waste waterline system

Drain-Waste Vent System (DWV System)

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TRUE OR FALSE
Vent pipes supply fresh air to each plumbing fixture in the house, which
helps the system move water through the drainage pipes each time a toilet is flushed ora sink is drained.

TRUE

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This system of pipes and fixtures is primarily responsible in discharging grey waste water from sinks, lavatories, floor drains, etc.

Drainage System

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This system of pipes and fixtures is primarily responsible in discharging black waste water from water closets.

Waste Collection System

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This system of pipes and fixtures is primarily responsible in ensuring that
adequate air is circulated inside the waste waterline system and that enough pressure is generated to pull and push these waste-water towards its point of disposal i.e. septic tank, public sewer line.

Ventilation System

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Receives the discharged waste material

DRAIN/FLOOR DRAIN

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A fitting or device that provides a liquid seal which prevents the
backflow of foul air inside the building. It traps the air inside the
pipes.

TRAP

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Any part of the piping system other than the
main, riser, or stack. These pipes are
connected to various fixtures which
discharges waste-water.

BRANCH PIPES/BRANCH LINE

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A vertical main pipe of a system extending through one or more
stories and/or extended through the roof.

STACK

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This type of pipe only conveys waste-water or liquid waste
free of any fecal matter

WASTE PIPE

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This type of pipe conveys waste water which includes fecal
matter

SOIL PIPE

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This type of pipe is used for ensuring the circulation of air and
relieving negative pressure exerted on trap seals in the system

VENT PIPE

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are used to ensure the circulation of air in a
plumbing system and for relieving the negative
pressure exerted on trap seals.

Ventilation Pipes

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This collects and discharges wastes from the adjacently connected soil pipes down to the soil pipes directly connected to the septic tank.

SOIL STACK

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This is the backbone of the entire sanitary system.

MAIN SOIL AND WASTE VENT

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This is also known as collecting line vent which serves as support to the main soil and waste vent. The principal artery of the venting system of which vent branches are connected.

MAIN VENT

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A pipe installed to vent a fixture trap, that connects with the vent system above the fixture served or terminates in the open air.

INDIVIDUAL VENT OR BACK BENT

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An arrangement of venting so installed that one vent pipe still serves
two traps.

UNIT VEBNT OR COMMON VENT OR DUAL VE NT

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A vertical vent line that provides additional circulation of air between the drainage and vent systems.

RELIEF VENT

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A pipe connecting
upward from a soil or
waste stack below the
floor and below horizontal
connection to an adjacent
vent stack at a point
above the floor and
higher than the highest
spill level of fixtures for
preventing pressure
changes in the stacks.

YOKE VENT OR BY-PASS VENT

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A group vent pipe which starts in front of the
extreme (highest) fixture connection on a
horizontal branch and connects to the vent
stack.

CIRCUIT VENT

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A vertical vent connection on a horizontal soil or
waste pipe branch at a point downstream of the last
fixture connection and turning to a horizontal line
above the highest overflow level of the highest
fixture connected there.

LOOPED VENT

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The portion of a vent
pipe through which
waste water also
flows through.

WET VENT

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A pipe used to
convey foul odors
from a fixture or
room.

LOCAL VENT

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This is used for basement or underground public restroom wherein a vent stack may not be possible to extend three meters above the ground, as it may constitute a hazard and is unsightly.

UTILITY VENT

A vent that does not carry liquid or water-borne wastes

DRY VENT

The extension of a soil or waste stack above the highest horizontal drain connected to the stack.

STACK VENT

The vertical vent pipe installed primarily for providing circulation of air to and from any part of the soil, waste of the drainage system. The uppermost end above the roof has traditionally been referred to as Vent Stack Through Roof (VSTR)

VENT STACK

in the pipes is a must in a piping system especially those that are intended for waste water disposal.

Ventilation

TRUE OR FALSE Based on the Revised National Plumbing Code of the Philippines, ventilation is required for each trap such that each trap shall be protected against siphonage and back-pressure through venting.

TRUE

TRUE OR FALSE Ventilation is not required for those traps serving sinks which are part of the equipment of bars, soda fountains, and counters, need not be vented when the location and construction of such bars, soda fountains, and counters makes it impossible to do so.

TRUE

Size of Vents

The diameter of an individual vent shall not be less than 32 mm (1-1/4”) nor less in size than one-half (1/2) the diameter of the drain to which it is connected.

TRUE OR FALSE All horizontal or branch vents shall be free from drops or sags

TRUE

Each vent shall rise vertically ___ mm above the highest level rim of the fixtures served before offsetting horizontally.

152

Each vent opening shall terminate:

- Not less than 3.00 m from any openable window - Not less than 0.90 m above any openable window - Not less than 0.90 m away from any lot line, alley and street boundary lines

exists when the water seal is removed due to direct application of the aforementioned pressure conditions.

Direct Siphonage

due to the pressure induced by the waste water discharges form the upper waste water pipes to the waste water pipe directly below it.

Momentum Siphonage

exists when excessive pressure is pushed out from within the waste pipe which makes the trap seal to be pushed out of the trap, as well.

Backpressure

in its literal sense, defines the ability of a liquid to flow in narrow spaces which can be primarily attributed to the liquids surface tension existing between these narrow spaces.

Capillary Action

A common private sewage disposal system found in most residential houses and buildings. A watertight covered receptacle designed and constructed to receive the discharge of sewage from a building sewer, separate solids from the liquid, digest organic matter and store digested solids through a period of detention, and allow the clarified liquids to discharge for final disposal.

SEPTIC TANK

the solid organic matter that are denser than water and settle at the bottom of the septic tank.

SLUDGE

lighter organic material that rise to the surface of the water.

SCUM

the liquid content of sewage typically found in between the sludge at the bottom and the scum at the top.

EFFLUENT

the liquid content of sewage typically found in between the sludge at the bottom and the scum at the top.

EFFLUENT

in a septic tank relies in oxygen to survive.

AEROBIC BACTERIA

can survive in a septic tank without oxygen

ANAEROBIC BACTERIA

should show all dimensions, reinforcing, structural calculations, and other pertinent data, as needed

PLANS

it shall be such as to produce a clarified effluent of acceptable standards and shall provide adequate space for sludge and scum accumulations

QUALITY OF DESIGN

it shall be constructed of durable materials, not subject to excessive corrosion or decay, and shall be watertight

MATERIALS

IT SHALL HAVE A MINIMUM OF TWO COMPARTMENTS

Compartments

IT SHALL NOT BE LESS THAN TWO-THIRDS CAPACITY OF THE TOTAL CAPACITY OF TANK NOT LESS THAN 2M3 LIQUID CAPACITY;SHALL BE AT LEAST 0.9M WIDTH AND 1.5M LONG; LIQUID DEPTH NOT LESS THAN 0.6M NOR MORE THAN 1.8M

First Compartment

IT SHALL HAVE A MAXIMUM OF ONE-THIRDS OF THE TOTAL CAPACITY OF THE TANK; MINIMUM OF 1M3 LIQUID CAPACITY

Second Compartment

shallhave a diameter size not less than the sewer pipe. The vertical legs of inlet and outlet pipes shall have a diameter size not less than the sewer pipe nor less than 104.6mm

SIZE OF PIPE INLET AND OUTLET

The inlet and outlet pipe shall extend 101.6mm above and at least 304.8mm below the water surface. The invert of the inlet pipe shall be at a level not less than 50.8mm above the invert of the outlet pipe.

LENGTH AND LOCATION OF INLET AND OUTLET

The side walls shall extend 228.6mm above liquid depth. The cover of septic tank shall be at least 50.8mm above the back vent openings.

AIR SPACE

An inverted fitting equivalent in size to the tank inlet, but in no case less than 104.6mm in diameter, shall be installed in the inlet compartment side of the baffle with the bottom of the fitting placed midway in the depth of the liquid. Wooden baffles are prohibited

PARTITION

Its_____ shall be capable of supporting an earth load of not less than 14.4kPa

STRUCTURE

The capacity of septic tanks is determined by the number of bedrooms or apartment units in dwelling occupancies; by the estimated waste/sewage design flow rate for various building occupancies; or by the number of fixture units of all plumbing fixtures; whichever is greater.

CAPACITY

It should not be located underneath the house; at least 1.5m from the building/structure; at least 1.5m from property line adjoining a private property; at least 15.20m away from the nearest water supply well or water streams i.e. river, and; at least 3m from nearby trees

LOCATION

three degrees or grades of waste water

Grey water, Black water, storm water

are used which functions as an underground conduit for carrying off drainage water and waste matter.

SEWERS

also known as collecting sewers, receives sewage flow from a number of branching sewer lines and conducts these waste water to a specific treatment plant.

INTERCEPTING SEWERS

placed at certain intervals and pumps or sewage ejectors are used to lift the waste from one lower end to its adjacent higher end to maintain continuity of sewage flow; sewers terminate at the disposal plant or treatment plant.

LIFTING STATIONS

STORM WATER SYSTEM

Natural System. Independent System, Combined System

is a waste water that is made up of rainwater. Aside from the typical drainage system discharging waste water from various fixtures inside a building, storm water drainage is used to properly discharge rainwater from the building's roof or roof decks.

Storm Water

a storm water system that only involves roofs to divert rainwater towards the ground without using any roof gutters or downspouts, typically used when rainwater are collected in cisterns

NATURAL SYSTEM

also known as the separate system, his brings collected rainwater directly to its water reservoirs or a public storm drainage line outside the building

INDEPENDENT SYSTEM

in this storm water piping system, both storm water with sanitary wastes are collected and discharged in a public sewer line this is prohibited since it mixes up both grey, black, and storm water within its pipes

COMBINED SYSTEM

it is usually located along the entire perimeter of the roof to collect rainwater

GUTTER

it is located every eight to ten meters and at every corner of the roof, but to avoid clogging of pipes, it is best to locate them every four to six meters

DOWNSPROUT

it is located every eight to ten meters and at every corner of the roof, but to avoid clogging of pipes, it is best to locate them every four to six meters

DOWNSPROUT

it is used to prevent clogging of pipes

STRAINER OR ROOF DRAIN

it is the end point of the downspout which discharges storm water from the downspout to its adjacent catch basin or the soil ground

SHOE

a storm water drain which collects rainwater from the roof through downspouts

CATCH BASIN

a series of pipes which connects each catch basin and transports its waste water to its intended public sewer line through a system of underground piping

STORM LINE

WATER SUPPLY PIPE SIZE CALCULATION

STEP 1: REQUIRED DATA STEP 2: REQUIRED PRESSURE AT THE FIXTURE STEP 3: LOSS IN STATIC PRESSURE STEP 4: PRESSURE LOSS IN WATER METER STEP 5: PRESSURE AVAILABLE IN WATER SUPPLY PIPES STEP 6: DEVELOPED LENGTH OF WATER SUPPLY PIPES STEP 7: TOTAL EQUIVALENT LENGTH OF WATER SUPPLY PIPES STEP 8: AVERAGE PERMISSIBLE FRICTION LOSS STEP 9: APPROXIMATE PIPE SIZE