Questions and Answers
The maximum fixture unit loading allowed on a 2 inch waste stack is:
Three-inch horizontal drainage piping shall have a grade or slope of not less than _________ inch per foot:
The maximum trap loading for a 3 inch trap is:
The minimum sizes of vertical and horizontal drainage shall be determined from the:
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The minimum size trap and trap arm for a bathtub is:
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The maximum discharge capacity for intermittent flow only, in gallons per minute (gpm), for one fixture unit is equal to:
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The minimum size drain line for a wall-hung urinal is:
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Of those listed, the acceptable fitting for connecting a horizontal drain line with another horizontal drain line is a:
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The clearance required in front of a 2 inch cleanout shall not be less than:
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The discharge line from an ejector shall be provided with a backwater valve:
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The minimum size discharge pipe from an ejector or pump in a single dwelling unit having a water closet connected thereto is:
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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:
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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:
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The total number of fixture units at 'A' is:
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The minimum size pipe at 'A' is:
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The minimum size pipe at 'B' is:
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The number of fixture units at 'C' is:
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The minimum size trap at 'D' is:
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Of those listed, the appropriate fitting at 'E' would be:
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The cleanout opening at 'F' shall be at least:
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The minimum size trap arm at 'G' is:
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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:
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Vertical drainage lines connecting with horizontal drainage lines shall enter through a:
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The maximum fixture units allowed on a 4-inch horizontal drain with a 1/8 inch per foot slope is:
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The minimum size of any building sewer shall be determined on the basis of the:
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A straight run of building sewer will require cleanouts at intervals not to exceed:
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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:
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The maximum distance between manholes shall not exceed:
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ABS and PVC DWV piping may be installed in structures of:
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Fittings on screwed pipe shall be of the:
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Except for plastic pipe, in lieu of a water test, drainage piping may be tested with:
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Threads in drainage fittings shall be tapped to allow for:
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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:
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Macerating toilet systems shall be permitted:
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Sumps for macerating toilets shall be:
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The drainage fixture unit value assigned to a bathtub or combination bath/shower is:
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With a few exceptions, all horizontal drainage piping shall be provided with a cleanout at:
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Every abandoned building sewer shall be plugged or capped:
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The building sewer and water piping may be installed in the same trench (with the proper clearances) if the building sewer piping is:
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Cleanouts shall be designed to be:
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A domestic dishwasher, with an independent drain, has a drainage fixture unit value of:
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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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Description
Test your knowledge on the Uniform Plumbing Code in Chapter 7, which focuses on sanitary drainage systems. This quiz covers key concepts such as fixture unit loading and drainage piping slope requirements. Challenge yourself and see how well you understand these essential plumbing standards!
