Questions and Answers
Both the UPC and the IPC utilize drainage fixture unit tables to determine the size of the DWV piping.
True
Public or public use occupancy covers plumbing fixtures in amusement parks and stadiums.
False
UPC table 703.2 maximum unit loading and maximum length of drainage and vent piping was developed for the first uniform plumbing code in 1945.
True
Pipes up to 3 inches should be installed at 18° slope.
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In most cases, vertical drainage piping length limitations would be applicable only in very tall or spacious buildings.
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The entire pathway of the vent system to the building sewer must be examined to ensure cross-sectional area requirement is met.
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A shower head over a bathtub or whirlpool bathtub attachment increases the drainage fixture unit value by one.
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In the IPC, a lavatory requires a 1 1/4 minimum size trap and is assigned one DFU.
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The American Standard national plumbing code has never been revised.
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When I stack offsets at more than 30° from the vertical, the offset becomes a horizontal pipe.
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Per IPC table 906.1, the developed length of a vent shall be measured from the vent connection to the open air.
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The size of vent connecting to the building drain and extending outdoors must equal the required building drain size.
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DFUs are equivalent to a?
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Per the UPC, buildings have a clothes washing area with clothes washers in a battery of three or more clothes washers are rated at _______ fixture units each.
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UPC chapter 10 section 1003.3 allows an increase of _______ pipe sizes for traps and trap arms.
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A vertical pipe segment of a stack is sized based on the?
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During the final step of vent sizing, the proper size of _________ should be determined.
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Reduction in DFU value is based on the theory that the fixtures within a bathroom group will not be used simultaneously.
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For fixtures with continuous flows such as a sump pump, the DFU value is based on?
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Waterless urinals are given a _________ DFU value because no water supply is utilized to replenish the fixture trap.
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Per the IPC, the minimum size of vent stacks and stacks events is determined by?
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A _______ is a length of soil or waste stack corresponding to the height of one story but no less than 8 feet within which the horizontal branches from one floor or story of a building are connected to the stack.
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If a stack of three branch intervals has a total discharge of 110 DFU, the stack size would be?
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A 40 GPM pump would need a minimum vent of?
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Per UPC table 703.2, only _______ water closets are allowed on a vertical pipe or stack.
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The UPC and IPC share a minimum pipe size for drainage and vent piping of?
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The _________ type of occupancy applies the plumbing fixtures in restrooms in commercial establishments where the fixtures are intended for the use of family or an individual.
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A _________ is installed for emergency use and is not assigned a DFU value because it does not add wastewater flow to the drainage system.
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Per IPC table 703.2, a 2 inch vent is limited to a maximum of __________ in a horizontal position.
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Proper venting is accomplished by ensuring the vent or vents terminating through the roof to atmosphere equals the _______ of the building sewer.
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According to the IPC, a _________ is a group of fixtures consisting of a water closet, lavatory, bathtub or shower including or excluding a bidet and emergency floor drain or both.
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Study Notes
Drainage Systems Overview
- Both the UPC (Uniform Plumbing Code) and IPC (International Plumbing Code) utilize drainage fixture unit tables for sizing DWV (Drainage, Waste, and Vent) piping.
- Drainage fixture units (DFUs) provide a measure of wastewater flow for plumbing fixtures.
Plumbing Fixture Classifications
- Public-use occupancy does not cover plumbing fixtures in amusement parks and stadiums.
- Private occupancy involves plumbing fixtures in restrooms designed for family or individual use.
Pipe Sizing and Installation
- UPC Table 703.2 establishes maximum unit loading and drainage and vent piping lengths; introduced in 1945.
- Vertical drainage piping length limits mainly apply to tall buildings.
- Pipes of up to 3 inches should not be installed at an 18° slope.
- Minimum pipe sizes for drainage and vent piping are set at 1-1/4 inches by both UPC and IPC.
Drainage and Venting Specifications
- The pathway of the vent system must meet cross-sectional area requirements to align with the building sewer.
- Vents must maintain proper sizes to accommodate the total number of DFUs connected to them.
- A vertical pipe segment is sized based on total DFU discharge.
Fixture Requirements and Values
- In IPC, lavatories require a minimum trap size of 1-1/4 inches and are assigned one DFU each.
- Clothes washers in a battery of three or more are rated at 6 fixture units each under UPC.
- Waterless urinals are assigned a DFU value of 1/2 since they do not utilize a water supply.
Venting and Discharge Guidelines
- Offsets in stacks exceeding 30° from the vertical remain classified as vertical pipes.
- A 40 GPM sump pump requires a minimum vent size of 1-1/2 inches.
- Proper venting ensures vent sizes equal the cross-sectional area of the building sewer.
Additional Plumbing Concepts
- DFU reduction is based on the assumption that bathroom fixtures will not be used simultaneously.
- For fixtures with continuous flow, DFU value is derived from double the GPM rating of the pump.
- A "branch interval" corresponds to one story's height, connecting horizontal branches to the soil or waste stack.
- The maximum developed length for 2-inch vents in horizontal positions is 40 feet.
Summary of Codes and Practices
- Only four water closets are permitted on a vertical pipe or stack according to UPC Table 703.2.
- Emergency floor drains are not assigned DFU values as they do not contribute to wastewater flow.
- A bathroom group includes a water closet, lavatory, bathtub or shower (with the option to include a bidet).
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Description
Test your knowledge of drainage systems with these flashcards from Chapter 7. This quiz covers various concepts, definitions, and codes related to drainage fixture units and plumbing regulations. Perfect for students and professionals in plumbing technology.
