Deck 12: Building Drains

Question 1

Branch openings into a building drain should enter at a __________ degree angle and ____________________ the centerline of the pipe.

Answer 1

45, above

Question 2

Fixtures not subject to backflow should drain by ____________________ to the building drain or building sewer.

Answer 2

gravity

Question 3

Floor drains do not require a trap.

Answer 3

False

Question 4

If installing the building drain involves trenching, all the rules of trenching safety must be observed.

Question 5

A dead end is an extension of more than 2' of a drain or vent beyond the last active connection.

Question 6

When installing a buiding drainage system, it is usually necessary to make a drawing.

Question 7

No connections should be made to a horizontal line within ten pipe diameters downstream from the base of a stack unless special venting is provided.

Question 8

The minimum satisfactory velocity in a drain line is

A) 1 fps.
B) 2 fps.
C) 2.5 fps.
D) 3 fps.

Question 9

If the building drain is buried in the earth, care is necessary to be sure that the piping has ____________________ ____________________.

Question 10

The building drain

A) receives the discharge from soil, waste, and other drainage piping inside the walls of a building.
B) is the lowest part of the drainage system.
C) conveys all discharge to the building sewer.
D) all of the above.

Question 11

____ intercept and retain greasy and oily substances.

A) Oil traps
B) Grease traps
C) Culinary waste traps
D) Food waste grinders

Question 12

Cleanouts or cleanout equivalents must be located for access to all of the drainage pipe.

Question 13

Building ____________________ may be permitted to use a wider range of materials than building ____________________.

Question 14

If fixtures are subject to backflow, they should be protected with a backwater valve or sewage pump.

Question 15

____ is caused when fast-moving waste from a stack meets with slower-moving waste in horizontal piping.

A) Stoppage
B) Hydraulic jump
C) Blockage
D) Water hammer

Question 16

The building drain is sized based on

A) the length of all the piping in the building.
B) the diameter of all the piping in the building.
C) the drainage fixture unit load connected to the drain.
D) the number of bedrooms in the building.

Question 17

Connections from stacks to building drains may be made with straight tees.

Question 18

The minimum size trap for a floor drain is 1- $\frac{1}{2}$ inches.

Question 19

Hydraulic jump is a term used to describe the flow pattern at the base of a stack.

Question 20

It is usually considered that building drains receive the discharge from ____________________ and not from individual ____________________.

Question 21

A flow rate of ____________________ is necessary to move solids in a drain line.

Question 22

It is good practice to wash drains that carry ____________________ ____________________ with another fixture or fixture group upstream.

Question 23

The building drain is sized from the same table as for building ____________________.

Question 24

Fixtures that could be flooded when the sewer is overloaded should be protected by a ____________________ ____________________ or ____________________ ____________________.

Question 25

____________________ ____________________ and ____________________ ____________________ are kept separate until these lines are outside the building, and depending on local code, they may never connect to each other.