topic 7 & 8: vents and venting system

Question 1

___ 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.

Answer 1

ventilation

Question 2

____ 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.

Answer 2

vent pipe

Question 3

____ 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.

Answer 3

vent stack, main vent

Question 4

____ is the uppermost pipe section of the waste stack above the highest fictures and can be used for both venting and drainage.

Answer 4

stack vent, soil and waste vent

Question 5

_____ are vent pipes that connect one or more individual vents to either a vent stack or stack vent.

Answer 5

branch vent

Question 6

VTR stand for ______ in plumbing.

Answer 6

vent through roof

Question 7

____ 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.

Answer 7

vent thru roof

Question 8

VFB stand for ____ in plumbing.

Answer 8

vented fixture branch

Question 9

____ does not carry waste and is only a stack for venting.

Answer 9

vent stack

Question 10

_____ 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.

Answer 10

stack vent

Question 11

_____ is a direct extension that must reach the outside air.

Answer 11

stack vent

Question 12

____ 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.

Answer 12

inidividual vent/back vent

Question 13

____ 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.

Answer 13

circuit vent

Question 14

____ can be used when two or more fixtures, such as lavatories, are installed in a row.

Answer 14

circuit vent

Question 15

The ____ is connected to the waste drain line between the last two fixtures in the row.

Answer 15

circuit vent

Question 16

The part of the soil stack above the highest branch is called the _____.

Answer 16

stack vent

Question 17

A ____ at each floor affords relief similar to that provided by individual fixtures-vents.

Answer 17

circuit vent

Question 18

____ 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.

Answer 18

loop vent

Question 19

____ 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.

Answer 19

loop vent

Question 20

What are the 2 main types of vents?

Answer 20

1. main soil and waste vent
2. main vent

Question 21

____ is the ‘backbone’ of the entire sanitary system.

Answer 21

main soil and waste vent

Question 22

___ is connected to the main soil & waste stack.

Answer 22

main soil and waste vent

Question 23

____ the portion where waste does not travel through.

Answer 23

main soil and waste vent

Question 24

____ continues to the roof.

Answer 24

main soil and waste vent

Question 25

The portion penetrating the roof is cale the _______ (VSTR).

Answer 25

vent stack through roof

Question 26

____ is the principal artery of the venting system to which vent branches are connected.

Answer 26

main vent

Question 27

____ serves as support to the main soil & wast vent.

Answer 27

main vent

Question 28

What are the 4 other types of vents?

Answer 28

1. wet vent 2. relief vent 3. dry vent 4. local vent

Question 29

____ is that portion of a vent pipe through which wastewater also flows through.

Answer 29

wet vent

Question 30

____ 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.

Answer 30

relief vent

Question 31

_____ is a vent that does not carry liquid or water-borne wastes.

Answer 31

dry vent

Question 32

_____ is a pipe or shaft to convey foul air from a plumbing fixture or a room to the other air.

Answer 32

local vent

Question 33

What are the 5 vent arrangements?

Answer 33

1. individual vent or back vent 2. unit, common, or dual vent 3. yokr or by-pass vent 4. circuit vent 5. loop vent

Question 34

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

Answer 34

individual vent or back vent

Question 35

___ is an arrangement of venting so installed that one vent pipe serve two (2) traps.

Answer 35

unit, common, or dual vent

Question 36

____ 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.

Answer 36

yoke or by-pass vent

Question 37

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

Answer 37

circuit vent

Question 38

____ a.k.a. 'loop vent'.

Answer 38

circuit vent

Question 39

___ serves a battery of fixtures.

Answer 39

circuit vent

Question 40

___ 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.

Answer 40

loop vent

Question 41

____ is used in spaces without partitions.

Answer 41

loop vent

Question 42

What are the 4 parts of vent systems based on the 1999 Revised National Plumbing Code of the Philippines?

Answer 42

1. circuit 2. loop 3. relief 4. yoke vent differences

Question 43

What are principles and guidelines (vents required)?

Answer 43

each trap shall be protected against siphonage and back-pressure through venting

Question 44

What are the 2 principles and guidelines (vents not required)?

Answer 44

1. 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. 2. traps servinf sinks in an island bar counter.

Question 45

The sizes of vent piping shall be determined from _______.

Answer 45

its length and the total number of fixture units connected thereto.

Question 46

The diameter of an indiivdual vent shall not be less than _____ (1-1/4").

Answer 46

32 mm

Question 47

The diameter of an individual vent shall not be less in size than ______ of the draim to which it is connected.

Answer 47

1/2 the diameter

Question 48

All ____ shall be free from drops or sags & shall be graded and connected to drip back by gravity to the drainage pipe it serves.

Answer 48

horizontal or branch vents

Question 49

Each vents shall rise vertically ____ above the highest level rim of the fixtures serves before offsetting horizontally.

Answer 49

152 mm

Question 50

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.

Answer 50

vent pipes

Question 51

The ____ shall be increases one (1) pipe size above the connection between the stack vent and the horizontal vent.

Answer 51

VSTR vent strack through roof

Question 52

Two (2) fixtures having same level inlet opening, may be served by a ______ connected to an approved double branch fitting.

Answer 52

common vertical vent pipe

Question 53

____ shall terminate vertically not less than 150 mm above the roof nor less than 300 mm from any vertical surface nearby.

Answer 53

VSTR

Question 54

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.

Answer 54

3.00 m

Question 55

The size of ____ shall not be less in diameter than either the soil stack or the vent stack, whichever is smaller.

Answer 55

yoke vent

Question 56

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.

Answer 56

fifth

Question 57

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.

Answer 57

1.0 m

Question 58

What are 7 sanitary system problems?

Answer 58

1. trap seal loss 2. back pressure 3. capillary attraction 4. evaportation 5. wind effects 6. retardation of flow 7. deterioration of the materials

Question 59

____ is a direct effect of the minus & plus pressure inside the system due to inadequate ventilation of traps.

Answer 59

trap seal loss

Question 60

____ is attributed to the following conditions: direct and momentum.

Answer 60

siphonage

Question 61

What are the 2 causes of trap seal loss due to siphonage?

Answer 61

1. direct siphonage 2. momentum siphonage

Question 62

_____ is caused by extreme temperatures, idleness.

Answer 62

evaporation

Question 63

_____ is caused by strong winds blow the trap seal.

Answer 63

wind effects

Question 64

____ is due to the effect of atmospheric pressure and/or gravity.

Answer 64

retardation of flow

Question 65

_____ is due to the formation of acids.

Answer 65

deterioration of the materials

Question 66

_____ 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.

Answer 66

indirect waste pipe