General venting

Question 1

When sizing a circuit vent what is the developed length of the piping that should be used?

Answer 1

the horizontal soil or waste pipe to the VS, SV, VH, or outside air

Question 2

list the 3 situations that a trap need not be protected by a vent:

Answer 2

4) A trap need not be protected by a vent pipe
a) where it serves
i) a subsoil drainage pipe, or
ii) a storm drainage system, or
b) where it forms part of an indirect drainage system (see also

2.5.1.1. 4) a) b)

Question 3

What table is used to size vent stacks?

Answer 3

2.5.8.4.

Question 4

List the requirements for venting an oil interceptor?

Answer 4

2 vents, opposite ends, extend independently, not less than 2 metres and differing by 300 mm.

Question 5

State the minimum size of vent pipe required for a 4” wc:

Answer 5

1 1/2”

Question 6

which table is used to size wet vents?

Answer 6

2.5.8.1.

Question 7

When sizing a branch vent, what is the developed length?

Answer 7

from the most distant soil or waste pipe connection to a VS, SV, VH, our outside air.

Question 8

what is the maximum size of every vent for a sewage sump?

Answer 8

not less than 2”, but need not be greater than 4”

Question 9

what is the maximum hydraulic load that may be connected to a circuit vent?

Answer 9

3 fus

Question 10

list the minimum size of vent pipping for a circuit vent (30 meters, 96 fus)

Answer 10

3”

Question 11

When is a vent stack required with fixtures draining into it:

Answer 11

more than 4 storeys.

Question 12

what size soil or waste stack, stack vent, and vent stack are required for an 8 storey building draining 250 fixture units? The length of the stack vent is 3 metres and the length of the vent is 25 metres.

Answer 12

WS/SS 4”, SV 2”, VS 3”

Question 13

What size of vent pipe would be required for a sewage sump with a 3” inlet?

Answer 13

2”

2.5.7.7. one size smaller then the largest branch or fixture drain

not smaller than 2” not larger than 4”

Question 14

how far away from an openable window or door can a vent terminate:

Answer 14

not less then 1 m above or not less than 3.5 m any other direction

Question 15

What is the minimum size of branch vent required when connecting two bathroom groups with a total vent length of 7 meteres?

Answer 15

1 1/2”

Question 16

what is the developed length that is used to size a vent header?

Answer 16

from the most distant soil or waste pipe connection to outside air

Question 17

what is the minimum size of wet vent for a bathroom group with a kitchen sink, not symmetrically connected, to the wet vent?

Answer 17

3”

Question 18

a soil or waste stack with 1.5 m offset, with 120 fixture units draining into the upper 3 storeys will require an offset relief vent?

2.5.4.4.

T or F

Answer 18

False

Question 19

what is the minimum size stack vent required for a 3” wet vented soil or waste stack draining 43 fixture units from 6 storeys? the vent’s length is 12 m.

Answer 19

3”

Question 20

what are the requirements for offsets in a wet vent?

Answer 20

no more than 1, does not exceed 1.2m for 2”, does not exceed 2.5m for 3”

Question 21

list one requirement for connecting fixtures to a vent stack:

Answer 21

no more than 8 fus connect to the lowest or below lowest connection

Question 22

when are additional circuit vents required with circuit vented branches?

Answer 22

when there is more than a 45 deg horizontal change OR more than 8 traps between the circuit vent and relief vent

Question 23

how is a vent pipe protected from a frost closure?

Answer 23

making it a minimum of 3”, increasing it one size or insulating it.

Question 24

how do you size a yoke vent?

Answer 24

one size smaller than the smallest pipe to which it is connected.

Question 25

what is the largest size trap arm or fixture that can drain into a wet vent?

Answer 25

3” emergency floor drain

Question 26

what would be the maximum number of tank type WCs that could drain into a wet vent?

Answer 26

0

Question 27

What is the largest size trap arm or fixture drain that can drain into a wet vent?

Answer 27

3” emergency floor drain

Question 28

What is the maximum number of tank type WC’s that can drain into a wet vent.

Answer 28

0

Question 29

How do you size a wet vent?

Answer 29

Hydraulic load

Question 30

How do you size a circuit vent?

Answer 30

By its FUs and developed length

Question 31

How do you size a relief vent?

Answer 31

one size smaller then the circuit vent but not larger then 2”

2.5.7.3. 2)

Question 32

what is the maximum number of circuit vented branch traps that can be installed between a circuit vent and a relief vent?

Answer 32

8 traps

Question 33

“A circuit vented branch, including the fixture drain downstream of the circuit vent connection, shall be sized in accordance with article 2.4.10.7. , except that it shall be not less than b) _________ inches, where traps 2 inches in size or larger are circuit vented”

Answer 33

3”

urinals, toilets, showers

CVB = is 3” when 2” traps are circuit vented

Question 34

“Additional circuit vents shall be required b) where more than _____ circuit vented fixtures are connected to a branch between vent pipe connections”

Answer 34

8

Question 35

“A soil-or-waste pipe may serve as an additional circuit vent in accordance with sentence (6) provided that the soil-or-waste pipe is sized as a wet vent in conformance with article 2.5.8.1. and is not less than _______ inches in size”

Answer 35

2”

an additional circuit vent must be sized as a wet vent and is not smalle

Question 36

“A section of horizontal branch may be circuit-vented provided no soil-or-waste stack is connected to it _________ of a circuit vented fixture”

Answer 36

upstream