Traps, Interceptors, Separators & Vents

Question 1

Fill in the blank:

The vertical distance from the fixture outlet to the trap weir shall not exceed ______ inches.

Answer 1

24 inches

Question 2

Fill in the blank:

A combination plumbing fixture is permitted to be installed on one trap provided that one compartment is not more than ______ inches deeper than the other compartment.

Answer 2

6

Question 3

Where is a slip joint connection of a trap not permitted?

Answer 3

trap offset

Question 4

Fill in the blank:

Each fixture trap shall have a trap seal not more than ______ inches deep.

Answer 4

4

Question 5

True or False:

A trap shall be larger than the drainage pipe into which the trap discharges.

Answer 5

False

Question 6

True or False:

Acid resistant traps shall be embedded in concrete.

Answer 6

True

Question 7

Which location does not require a grease interceptor or automatic grease removal device?

Answer 7

residential kitchen

Question 8

What is the grease retention capacity for an interceptor with a flow-through rate of 10 GPM?

Answer 8

20 pounds

Question 9

Fill in the blank:

______ shall be provided for inspection and maintenance of automatic grease removal devices.

Answer 9

Ready access

Question 10

Fill in the blank:

A wire basket on the discharge side of a clothes washer shall prevent the passage of solids ______ inch(es) or larger from being discharged into the public sewer.

Answer 10

1/2

Question 11

True or False:

The plumbing vent system may be used for purposes other than venting of the plumbing when approved by the code official.

Answer 11

False

Question 12

Fill in the blank:

Where a rooftop is used for restaurant dining, open vent pipes shall terminate not less than ______ feet above the roof.

Answer 12

7

Question 13

Fill in the blank:

Any increase in size for vent terminations shall be created not less than ______ inside the thermal envelope.

Answer 13

12 inches

Question 14

Fill in the blank:

A vent stack is required when there are more than ______ branch intervals in a building.

Answer 14

five

Question 15

Fill in the blank:

If a vent extends more than ______ feet in developed length, then the vent shall be increased by one nominal pipe size for the entire length.

Answer 15

40

Question 16

What is the vent pipe size for a drainage system serving a 4” stack carrying 300 DFU with a developed length of 75 feet?

Answer 16

3 inches

Question 17

True or False:

The developed length may be measured from the farthest point of vent connection to the drainage system to the vent termination outside the building.

Answer 17

True

Question 18

Fill in the blank:

Relief vents shall be provided for stacks having ______ or more branch intervals

Answer 18

10

Question 19

What is the maximum distance for a trap arm for a 1 1/4” trap with 1/4” per foot grade?

Answer 19

5 feet

Question 20

What is the maximum distance for a trap arm for a 3” trap with 1/8” per foot grade?

Answer 20

12 feet

Question 21

True or False:

Common vented trap fixtures shall be located on the same floor level.

Answer 21

True

Question 22

True or False:

Fixtures being vented by a horizontal wet vent must be on the same floor level.

Answer 22

True

Question 23

True or False:

A waste stack vent system is permitted to have 45-degree offsets within the stack.

Answer 23

False

Question 24

What is the maximum number of fixtures that can be served by a circuit vent?

Answer 24

8

Question 25

# True or False: When a circuit vented drain connects to a stack receiving waste from above, a relief vent is required.

Answer 25

True

Question 26

Which of the following fixtures is permitted to be served by an island fixture vent? a. water closet b. urinal c. sink d. service sink

Answer 26

c. sink

Question 27

What is the maximum distance for a horizontal branch serving fixtures other than toilets in a single stack vent system?

Answer 27

12 feet

Question 28

What is the minimum pipe size for a fixture branching vertically from a horizontal branch in a single stack vent system?

Answer 28

2 inches

Question 29

# Fill in the blank: In a single stack vent system, stacks greater than two branch intervals shall not receive discharge from horizontal branches on the lower \_\_\_\_\_\_ floors.

Answer 29

two

Question 30

# True or False: Air admittance valves shall be permitted to be installed in plenums.

Answer 30

False