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Questions and Answers
The maximum fixture unit loading allowed on a 2 inch waste stack is:
The maximum fixture unit loading allowed on a 2 inch waste stack is:
- Eight
- Six
- Sixteen (correct)
- Four
Three-inch horizontal drainage piping shall have a grade or slope of not less than _________ inch per foot:
Three-inch horizontal drainage piping shall have a grade or slope of not less than _________ inch per foot:
- 1/2
- 1
- 1/4 (correct)
- 1/8
The maximum trap loading for a 3 inch trap is:
The maximum trap loading for a 3 inch trap is:
- Four
- One
- Three
- Six (correct)
The minimum sizes of vertical and horizontal drainage shall be determined from the:
The minimum sizes of vertical and horizontal drainage shall be determined from the:
The minimum size trap and trap arm for a bathtub is:
The minimum size trap and trap arm for a bathtub is:
The maximum discharge capacity for intermittent flow only, in gallons per minute (gpm), for one fixture unit is equal to:
The maximum discharge capacity for intermittent flow only, in gallons per minute (gpm), for one fixture unit is equal to:
The minimum size drain line for a wall-hung urinal is:
The minimum size drain line for a wall-hung urinal is:
Of those listed, the acceptable fitting for connecting a horizontal drain line with another horizontal drain line is a:
Of those listed, the acceptable fitting for connecting a horizontal drain line with another horizontal drain line is a:
The clearance required in front of a 2 inch cleanout shall not be less than:
The clearance required in front of a 2 inch cleanout shall not be less than:
The discharge line from an ejector shall be provided with a backwater valve:
The discharge line from an ejector shall be provided with a backwater valve:
The minimum size discharge pipe from an ejector or pump in a single dwelling unit having a water closet connected thereto is:
The minimum size discharge pipe from an ejector or pump in a single dwelling unit having a water closet connected thereto is:
A horizontal drain pipe has an existing load of 30 fixture units. After adding a new discharge pipe from an ejector rated at 60 gpm, the total load on the horizontal drain pipe will be:
A horizontal drain pipe has an existing load of 30 fixture units. After adding a new discharge pipe from an ejector rated at 60 gpm, the total load on the horizontal drain pipe will be:
Because of structural conditions, a 4-inch building drain is installed with a slope of 1/8 inch per foot. This installation will result in:
Because of structural conditions, a 4-inch building drain is installed with a slope of 1/8 inch per foot. This installation will result in:
The total number of fixture units at 'A' is:
The total number of fixture units at 'A' is:
The minimum size pipe at 'A' is:
The minimum size pipe at 'A' is:
The minimum size pipe at 'B' is:
The minimum size pipe at 'B' is:
The number of fixture units at 'C' is:
The number of fixture units at 'C' is:
The minimum size trap at 'D' is:
The minimum size trap at 'D' is:
Of those listed, the appropriate fitting at 'E' would be:
Of those listed, the appropriate fitting at 'E' would be:
The cleanout opening at 'F' shall be at least:
The cleanout opening at 'F' shall be at least:
The minimum size trap arm at 'G' is:
The minimum size trap arm at 'G' is:
Drainage connections shall not be made into a drainage piping system within ___________ feet of any vertical to horizontal change of direction of a stack containing suds-producing fixtures:
Drainage connections shall not be made into a drainage piping system within ___________ feet of any vertical to horizontal change of direction of a stack containing suds-producing fixtures:
Vertical drainage lines connecting with horizontal drainage lines shall enter through a:
Vertical drainage lines connecting with horizontal drainage lines shall enter through a:
The maximum fixture units allowed on a 4-inch horizontal drain with a 1/8 inch per foot slope is:
The maximum fixture units allowed on a 4-inch horizontal drain with a 1/8 inch per foot slope is:
The minimum size of any building sewer shall be determined on the basis of the:
The minimum size of any building sewer shall be determined on the basis of the:
A straight run of building sewer will require cleanouts at intervals not to exceed:
A straight run of building sewer will require cleanouts at intervals not to exceed:
With appropriate cause and Authority Having Jurisdiction approval, building sewers 8 inches or larger shall be permitted to have a slope of not less than:
With appropriate cause and Authority Having Jurisdiction approval, building sewers 8 inches or larger shall be permitted to have a slope of not less than:
The maximum distance between manholes shall not exceed:
The maximum distance between manholes shall not exceed:
ABS and PVC DWV piping may be installed in structures of:
ABS and PVC DWV piping may be installed in structures of:
Fittings on screwed pipe shall be of the:
Fittings on screwed pipe shall be of the:
Except for plastic pipe, in lieu of a water test, drainage piping may be tested with:
Except for plastic pipe, in lieu of a water test, drainage piping may be tested with:
Threads in drainage fittings shall be tapped to allow for:
Threads in drainage fittings shall be tapped to allow for:
The maximum number of fixture units allowed on a 4-inch building sewer with a slope of 1/8 inch per foot, as compared to a 4-inch building sewer with a slope of 1/4 inch per foot is:
The maximum number of fixture units allowed on a 4-inch building sewer with a slope of 1/8 inch per foot, as compared to a 4-inch building sewer with a slope of 1/4 inch per foot is:
Macerating toilet systems shall be permitted:
Macerating toilet systems shall be permitted:
Sumps for macerating toilets shall be:
Sumps for macerating toilets shall be:
The drainage fixture unit value assigned to a bathtub or combination bath/shower is:
The drainage fixture unit value assigned to a bathtub or combination bath/shower is:
With a few exceptions, all horizontal drainage piping shall be provided with a cleanout at:
With a few exceptions, all horizontal drainage piping shall be provided with a cleanout at:
Every abandoned building sewer shall be plugged or capped:
Every abandoned building sewer shall be plugged or capped:
The building sewer and water piping may be installed in the same trench (with the proper clearances) if the building sewer piping is:
The building sewer and water piping may be installed in the same trench (with the proper clearances) if the building sewer piping is:
Cleanouts shall be designed to be:
Cleanouts shall be designed to be:
A domestic dishwasher, with an independent drain, has a drainage fixture unit value of:
A domestic dishwasher, with an independent drain, has a drainage fixture unit value of:
After caulking a lead joint in a cast iron hub, the finished joint shall not exceed __________ of an inch below the hub:
After caulking a lead joint in a cast iron hub, the finished joint shall not exceed __________ of an inch below the hub:
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Study Notes
Sanitary Drainage Key Facts
- Maximum fixture unit loading allowed on a 2-inch waste stack is sixteen.
- Minimum slope for three-inch horizontal drainage piping is 1/4 inch per foot.
- Maximum trap loading for a 3-inch trap is six units.
- Minimum sizes of vertical and horizontal drainage depend on total fixture units.
- Minimum size trap and trap arm for a bathtub is 1-1/2 inches.
- Discharge capacity for one fixture unit is 7-1/2 gallons per minute.
- Minimum size drain line for a wall-hung urinal is 1-1/2 inches.
- Acceptable fitting for connecting horizontal drain lines is a combination wye and 1/8 bend.
- Clearance in front of a 2-inch cleanout must be no less than 18 inches.
- Ejector discharge line requires a backwater valve or swing check valve and gate valve.
- Minimum size discharge pipe from an ejector in a single dwelling unit is 2 inches.
- Adding a new ejector rated at 60 gpm increases total load on a horizontal drain pipe to 150 fixture units.
- A 4-inch building drain slope of 1/8 inch per foot results in a reduction in fixture unit loading allowance.
- Minimum size pipe sizes can be influenced by locations like points "A" (3 inches), "B" (2 inches), "C" (4 units), and "D" (2 inches).
- Connections in drainage piping should not be within 2 feet of any vertical to horizontal change of direction for suds-producing fixtures.
- Maximum fixture units for a 4-inch horizontal drain at a 1/8 inch per foot slope is 173.
- Building sewer size is based on the total number of fixture units and building drain size.
- Cleanouts are required at intervals not exceeding 100 feet for a straight run of building sewer.
- Building sewers of 8 inches or larger can have a 1/16 inch per foot slope with approval.
- Maximum distance between manholes must not exceed 300 feet.
- ABS and PVC DWV piping is permitted in noncombustible and combustible constructions of unlimited height.
- Fittings on screwed pipes should be recessed-drainage type.
- In lieu of water tests, drainage piping can be tested with air.
- Threads in drainage fittings should accommodate grade adjustments.
- Maximum fixture unit allowances decrease for a lower slope in a 4-inch building sewer.
- Macerating toilet systems are allowed when approved by the Authority Having Jurisdiction.
- Sumps for macerating toilets must be watertight and gastight.
- Bathtub drainage fixture unit value is 2.0.
- Cleanouts are needed at the upper terminal of every horizontal drainage piping.
- Abandoned building sewers must be capped within 5 feet of the property line.
- Building sewers and water piping can be installed in the same trench with proper clearances.
- Cleanouts must be gas-tight and watertight.
- A domestic dishwasher with an independent drain has a drainage fixture unit value of 2.
- Finished lead joint in a cast iron hub should not exceed 1/8 inch below the hub's top.
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