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WorksheetsProperly sizing drainage pipes
Total questions: 13
Worksheet time: 7mins
What is the minimum diameter required for a building sewer?
4'
1½'
2²'
3'
What is the maximum number of water closets permitted to drain into a 3" stack in any one story or branch interval?
1
4
3
2
What is the purpose of a branch interval in plumbing?
To connect horizontal branches to the stack
To regulate water flow in the stack
To prevent clogging in the stack
To increase the stack diameter
What is the minimum diameter required for a stack vent or vent stack extended full size through the roof?
1½'
3'
2²'
4'
What is the maximum number of drainage fixture units that may empty into a stack of not more than three stories, with a maximum of three branch intervals?
20
500
42
72⁹
What is the purpose of properly sized horizontal drainage pipes?
To decrease the discharge capacities of drainage pipes
To separate solids from the water and retain them in the drainage piping
To ensure proper scouring action and prevent stoppage of the drainage piping
To increase positive pressure in the plumbing system
What is the minimum diameter required for a stack serving two sinks with 1/2" traps and drains, located on different floors of the building?
1/2'
3'
1½'
2²'
What is the total discharge of all the fixtures in a building in drainage fixture units if it consists of 30 water closets, 28 lavatories, four drinking fountains, three wall-hung urinals with 2" traps, four 2" floor drains, and two service sinks?
142
238
369
180
What is the maximum number of drainage fixture units that may empty into a stack on any one story or branch interval?
3600
240
540
960
What is the purpose of a full-size stack vent located farthest from where the building drain leaves the building?
To decrease the velocity of wastewater and waterborne waste
To prevent basement flooding and back pressure
To increase the efficiency of horizontal drainage pipes
To ensure proper scouring action in the drainage piping
What is the minimum diameter required for a stack serving three sinks with 1" traps and drains, located on different floors of the building?
1'
3'
1½'
2²'
What is the total discharge of all the fixtures in a building in drainage fixture units if it consists of 40 water closets, 35 lavatories, five drinking fountains, four wall-hung urinals with 2" traps, five 2" floor drains, and three service sinks?
152
248
379
190
What is the purpose of a full-size stack vent located closest to where the building drain leaves the building?
To decrease the velocity of wastewater and waterborne waste
To prevent basement flooding and back pressure
To increase the efficiency of horizontal drainage pipes
To ensure proper scouring action in the drainage piping
