topic 7 & 8: vents and venting system Flashcards
___ is the process of supplying or removing air by natural or artificial means to or from any space, such air may or may have not been conditioned.
ventilation
____ is a pipe installed to provide a flow of air to and from a drainage system or to provide circulation of air within such system to protect the trap seal from siphonage and back pressure.
vent pipe
____ is a vertical pipe parallel to the waste/soil to which all drain vents are connected and are only used to ven the drainage system.
vent stack, main vent
____ is the uppermost pipe section of the waste stack above the highest fictures and can be used for both venting and drainage.
stack vent, soil and waste vent
_____ are vent pipes that connect one or more individual vents to either a vent stack or stack vent.
branch vent
VTR stand for ______ in plumbing.
vent through roof
____ are vent pipes that pass through your roofs so that the different gases that build up in your piper are able to escape through your roof and will disperse into the atmosphere instead of leaking into your home.
vent thru roof
VFB stand for ____ in plumbing.
vented fixture branch
____ does not carry waste and is only a stack for venting.
vent stack
_____ is the extension of the waste stack to provide venting. The uppermost part of the waste stack that connects to the uppermost part of the roof.
stack vent
_____ is a direct extension that must reach the outside air.
stack vent
____ is a type of venting system where the vent connects with a single fixture trap, usually at the back and extend vertically and connects with a stack vent, a vent stack or branch vent.
inidividual vent/back vent
____ is a branch vent which serves two or more traps and extends from in front of the last fixture connection of a horizontal branch to the vent stack.
circuit vent
____ can be used when two or more fixtures, such as lavatories, are installed in a row.
circuit vent
The ____ is connected to the waste drain line between the last two fixtures in the row.
circuit vent
The part of the soil stack above the highest branch is called the _____.
stack vent
A ____ at each floor affords relief similar to that provided by individual fixtures-vents.
circuit vent
____ is a vent arrangement for a group of plumbinng fixtures, consist of a vent pipe which is connected to the waste or soil branch immediately before the first fixture of the group.
loop vent
____ is a plumbing venting arrangement used to provide venting for fixtures located in close proximity to each other, such as sinks in a kitchen or bathroom.
loop vent
What are the 2 main types of vents?
- main soil and waste vent
- main vent
____ is the ‘backbone’ of the entire sanitary system.
main soil and waste vent
___ is connected to the main soil & waste stack.
main soil and waste vent
____ the portion where waste does not travel through.
main soil and waste vent
____ continues to the roof.
main soil and waste vent
The portion penetrating the roof is cale the _______ (VSTR).
vent stack through roof
____ is the principal artery of the venting system to which vent branches are connected.
main vent
____ serves as support to the main soil & wast vent.
main vent
What are the 4 other types of vents?
- wet vent
- relief vent
- dry vent
- local vent
____ is that portion of a vent pipe through which wastewater also flows through.
wet vent
____ is a vertical vent line that provides additional circulation of air between the drainage and vent systems or to act as an auxiliary vent on a specially designed system such as a “yoke vent” connection between the soil and vent stacks.
relief vent
_____ is a vent that does not carry liquid or water-borne wastes.
dry vent
_____ is a pipe or shaft to convey foul air from a plumbing fixture or a room to the other air.
local vent
What are the 5 vent arrangements?
- individual vent or back vent
- unit, common, or dual vent
- yokr or by-pass vent
- circuit vent
- loop vent
____ 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 vent
___ is an arrangement of venting so installed that one vent pipe serve two (2) traps.
unit, common, or dual vent
____ a pipe connecting upward from a soil or waste stack below that floow 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 or by-pass vent
___ 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
____ a.k.a. ‘loop vent’.
circuit vent
___ serves a battery of fixtures.
circuit vent
___ is 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 fixtures connected there.
loop vent
____ is used in spaces without partitions.
loop vent
What are the 4 parts of vent systems based on the 1999 Revised National Plumbing Code of the Philippines?
- circuit
- loop
- relief
- yoke vent differences
What are principles and guidelines (vents required)?
each trap shall be protected against siphonage and back-pressure through venting
What are the 2 principles and guidelines (vents not required)?
- on a primary settling tank interceptor which discharges through a horizontal indirect waste peipe into a secondary interceptor. the secondary interceptor shall be properly trapped and vented.
- traps servinf sinks in an island bar counter.
The sizes of vent piping shall be determined from _______.
its length and the total number of fixture units connected thereto.
The diameter of an indiivdual vent shall not be less than _____ (1-1/4”).
32 mm
The diameter of an individual vent shall not be less in size than ______ of the draim to which it is connected.
1/2 the diameter
All ____ shall be free from drops or sags & shall be graded and connected to drip back by gravity to the drainage pipe it serves.
horizontal or branch vents
Each vents shall rise vertically ____ above the highest level rim of the fixtures serves before offsetting horizontally.
152 mm
All ____ shall extend undiminished in size above the rood or shall be reconnected to the soil or waste stack vent to a point below the roof.
vent pipes
The ____ shall be increases one (1) pipe size above the connection between the stack vent and the horizontal vent.
VSTR vent strack through roof
Two (2) fixtures having same level inlet opening, may be served by a ______ connected to an approved double branch fitting.
common vertical vent pipe
____ shall terminate vertically not less than 150 mm above the roof nor less than 300 mm from any vertical surface nearby.
VSTR
Vertical pipes shall extend ____ distant from any part of the roof that is used for human activities and shall extend not less than 2.10 m above such roof.
3.00 m
The size of ____ shall not be less in diameter than either the soil stack or the vent stack, whichever is smaller.
yoke vent
Each soil or waste stach extending ten (10) or more storeys above the building drain shall be served by a parallel vent stack which shall extend undiminished in size from its upper terminal at the roof and connect to the soil or waste stack at ground level and at every ____ floor levels with a “yoke vent” at a point below the horizontal soil or waste branch connection to the stack and at the nearby vent stack above the same floor to provide a relief vent.
fifth
The yoke vent connection at the vent stack shall be placed ____ above the floor level and, by means of wye branch at the soil stakc, shall be placed below the fixture branch serving that floor.
1.0 m
What are 7 sanitary system problems?
- trap seal loss
- back pressure
- capillary attraction
- evaportation
- wind effects
- retardation of flow
- deterioration of the materials
____ is a direct effect of the minus & plus pressure inside the system due to inadequate ventilation of traps.
trap seal loss
____ is attributed to the following conditions: direct and momentum.
siphonage
What are the 2 causes of trap seal loss due to siphonage?
- direct siphonage
- momentum siphonage
_____ is caused by extreme temperatures, idleness.
evaporation
_____ is caused by strong winds blow the trap seal.
wind effects
____ is due to the effect of atmospheric pressure and/or gravity.
retardation of flow
_____ is due to the formation of acids.
deterioration of the materials
_____ is a pipe that does not connect directly with the drainage system but conveys liquid wastes by discharging into a plumbing fixture, interceptor or receptacle, directly connected to the drainage system.
indirect waste pipe
