Deck 17: Venting Plumbing Drainage Systems

Question 1

If aggressive chemicals are present in the drain line, vent piping material must be selected that is compatible with those chemicals.

Answer 1

True

Question 2

A side vent is a vent connecting to a drain pipe through a fitting at an angle not greater than 45° to the vertical.

Answer 2

True

Question 3

Hangers should be selected based solely on cost and type of pipe.

Answer 3

False

Question 4

The principal function of the vent system is to

A) transport waste from fixtures to the building drain.
B) siphon water from traps.
C) allow sewer gases to enter the building.
D) provide air circulation.

Question 5

The ____ is the water in the trap that closes off the pathway for gases to pass from the drainage system into the room.

A) plumbing vent system
B) trap seal
C) main vent
D) trap arm

Question 6

Cast iron vent pipe run horizontally must be supported at every joint.

Question 7

Plastic vent pipe run vertically must be supported every 4 feet.

Question 8

Vent terminals above the roof may be used to support small antennas.

Question 9

The trap seal keeps sewer gases in the drainage system and prevents them from entering the building.

Question 10

In general, piping materials suitable for drainage may be used for vents.

Question 11

Yoke vents can be used on only buildings ten stories or less.

Question 12

Horizontal runs of copper tubing should be supported every 4 feet.

Question 13

All horizontal vent piping should be installed so it

A) slopes to drain.
B) is perfectly level.
C) inclines upward at" per foot rise.
D) none of the above.

Question 14

To prevent siphoning, trap arms should be installed level.

Question 15

A continuous vent is one that remains open even when fixtures are not being used.

Question 16

Benefits of a venting system include

A) encouraging aerobic bacteria to thrive and break down sewage.
B) permitting the transport of hazardous gases to the outside.
C) alleviating soap suds problems.
D) all of the above.

Question 17

Vents should be located under roof overhangs to prevent rain from entering them.

Question 18

Hangers for horizontal piping should allow for free movement of pipe.

Question 19

A ____ vent is both a drain line and a vent line.

A) loop
B) circuit
C) wet
D) back

Question 20

Fixtures that are not vented will not drain properly.

Question 21

Which of the following is NOT a factor in sizing a vent system?

A) the length of the piping to the open air
B) the sum of the length of all piping in the building
C) the size of the stack to be vented
D) the drainage fixture unit load to be served.

Question 22

____ are used to secure vertical pipes.

A) Suspension brackets
B) Split-ring hangers
C) Riser clamps
D) Clevis hangers

Question 23

Which of the following is a prohibited vent type?

A) crown vent
B) local vent
C) main vent
D) relief vent

Question 24

A ____ is a relief vent installed in high-rise systems to equalize pressures.

A) stack vent
B) side vent
C) yoke vent
D) main vent

Question 25

A ____ is a vertical vent that is a continuation of the drain which it serves.

A) back vent
B) common vent
C) continuous vent
D) dual vent

Question 26

The principal vent line in the system is called the ____.

A) side vent
B) relief vent
C) main vent
D) loop vent

Question 27

Fixtures that are not vented will drain

A) as well as vented fixtures.
B) some of the time.
C) most of the time.
D) erratically, with gurgling sounds and fluctuating water levels.

Question 28

Which of the following is NOT a factor when selecting chemical vent piping?

A) types of chemicals
B) chemical concentration
C) pressure
D) temperature

Question 29

The maximum pressure difference permitted at any trap outlet is plus or minus ____ of water column.

A) 1 inch
B) 1 foot
C) 2 inches
D) 2 feet

Question 30

The hydraulic gradient for a trap arm is ____ per foot.

A) "
B) "
C) "
D) "

Question 31

Hangers must be able to support piping that is ____ full of water.

A) 25%
B) 50%
C) 75%
D) 100%

Question 32

A ____ connects one or more individual vents with a vent stack or stack vent.

A) branch vent
B) circuit vent
C) dual vent
D) loop vent

Question 33

It is important that vent piping be supported adequately to prevent

A) sagging sections that can fill with water and block the vent.
B) pipe from coming apart at joints.
C) problems with leakage at roof flashings.
D) all of the above.

Question 34

What is the smallest size of vent piping generally permitted by code?

A) 1"
B) 1"
C) 1"
D) 2"

Question 35

At what intervals must horizontally-installed plastic piping be supported?

A) every 4 feet
B) at ends of branches
C) at changes in direction
D) all of the above