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163 Cards in this Set
- Front
- Back
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The purpose of drawing a stack elevation is to show:
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Side/two dimensional view of the installation of stacks, wastes, and vents in a building
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Stack elevations show all the vertical pipes including:
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Connections to the underground horizontal drains and their terminals above the roof.
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What size flashing is required for a vent terminating above a roof?
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500mm x 500mm
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What is the minimum distance above a roof a vent must terminate?
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150mm
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True or False: A stack elevation is used for a practical plumbing layout.
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True
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True or False: A stack elevation may be used for a training exercise to show the best way to connect fixtures, drains, vents, etc...
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True
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True or False: Stacks cannot be sized from a stack elevation.
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False
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True or False: Location of vent terminals can be shows on a stack elevation.
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True
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True or False: Vent sizing cannot be properly shown on a stack elevation.
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False
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True or False: Proper pipe slope should be shown on a stack elevation.
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False
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True or False: The type of material to be used in a plumbing installation should be shown on a stack elevation.
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False
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True or False: Trap types and sizes are shown on a stack elevation.
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False
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True or False: Cleanout size, but now cleanout spacing can be shown on a stack elevation.
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True
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True or False: Water pipe risers should be shown on a stack elevation.
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False
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True or False: Water pipes are shown on a riser diagram.
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True
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True or False: Vent loading cannot be shown on a stack elevation.
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False
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True or False: Stack elevations are limited to housing and low rise residential buildings only.
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False
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True or False: An accurate material takeoff may be done from a stack elevation.
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False
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True or False: The building drain and all horizontal branches should be drawn with a stack elevation.
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False
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True or False: Foundation drain and downspout connections cannot be shown on a stack elevation.
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False
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True or False: All drain, waste, and vent piping above the basement floor should be sized on a stack elevation.
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True
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True or False: Trap seal primers for floor drains do not need to be shown on a stack elevation.
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False
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When drawing a stack elevation, the general rule is to adopt the:
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Most economical piping arrangements
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Carefully decide the location for the:
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Main soil stack
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The only protection that the public has against the inhalation of some of the most infectious diseases created by bacterial growth inside sewer pipes and sewage plants is the:
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Plumbing trap
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A well designed trap should offer little or no:
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Restriction in flow
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All traps have three identifiable parts. These are the:
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1) Weir
2) Crown 3) Dip |
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The trap seal is the liquid depth between the:
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Weir and the dip of the trap
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Should the liquid in the trap fall below the dip level, there would be:
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No water seal
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Under normal conditions the liquid in a trap lies:
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At the weir level of the trap
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The most common form of the fixture trap is:
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The p-trap
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The drum trap is not considered by many plumbing authorities to be acceptable because:
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It is not self cleaning
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The trap which relies on internal piping to provide the seal is the:
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Bottle trap
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Of the common residential fixtures, the fixture which has an integral siphonic trap is the:
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Water closet
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A fixture trap should be located as close as possible to the fixture to minimize the amount of un-trapped waste pipe. This will then prevent bacterial growth in the pipe which creates:
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Sewer gases
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Where a fixture forms an island in the floor of the room, a trap may be located:
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In or under the floor, directly below the fixture
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A trap seal will remain undisturbed only if atmospheric pressure is maintained in the waste pipe:
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On the downstream sewer side of the trap
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Name the 4 conditions that promote bacterial growth inside a sanitary pipe:
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1) Temperature
2) Humidity 3) Oxygen 4) Darkness |
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The name of the by-product emitted by bacterial growth is called:
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Sewer Gas
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Bacteria will grow above what temperature?
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90F
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Between what temperatures will bacteria become stagnant?
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33F and 90F
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Bacteria will colonize in a pipe above what level of humidity?
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35% humidity
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Bacteria thrive in the absence of: (2)
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Daylight and Oxygen
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A fitting or device that provides a liquid seal to prevent the emission of sewer gasses without affecting the flow of sewage or waste water through it:
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A trap
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Ontario Building Code states that all fixtures require:
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A trap
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Where does Ontario Building Code state a trap must be located?
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As close as possible to the fixture that they serve in order to prevent bacterial growth in the fixture outlet pipe.
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What is the minimum depth on an acid waste trap?
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2"
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The level at which liquid will spill over into the waste pipe is the:
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Trap weir
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The level below which there is no effective barrier against the emission of sewer gas is the:
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Trap dip
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The point above the weir is the:
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crown
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The Ontario Building Code does not allow the use of 'S' Traps as fixture traps with the exception of: (2)
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Mop or service sinks
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Sewer gas is mainly composed of:
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50% Carbon Dioxide and 45% Methane
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Which trap standard forms the support for th fixture?
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S-Trap Standard
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The name for a trap which is built in and forms part of the fixture itself.
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Integral trap
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Every trap that serves a lavatory, a sink, or a laundry tray shall be provided with a cleanout plug minimum:
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3/4" in size
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If no access is available for the P-trap required on a bathtub what shall not be installed?
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Washers, nuts, or slip-joints
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What shall a trap seal not depend on?
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Moving parts
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No running trap shall be installed in a plumbing system unless:
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An accessible hand hole is provided for cleaning of the trap
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Fixture traps are manufactured in sizes:
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1 1/4" and larger
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The minimum fixture trap size permitted by Ontario Regulations is:
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1 1/4"
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A water closet requires a 3 inch waste pipe, primarily because of the:
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Siphonic action of the flush and the flushing volume
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Where a fixture does not have a listed trap size, the deciding factor is always:
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The diameter of the fixture outlet pipe
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What is the trap size for a water closet?
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3"
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What is the trap size for a bathtub?
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1.5"
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What is the trap size for a domestic laundry machine?
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2"
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What is the trap size for a stall urinal?
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2"
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What is the trap size for a laundry tub?
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1.5"
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What is the trap size for a wash basin?
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1 1/4"
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What is the trap size for a domestic kitchen sink?
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1.5"
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What is the trap size for a bidet?
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11/4"
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What is the trap size for shower stall?
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1.5"
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The partial or complete loss of the liquid which forms the seal in a trap is called:
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Trap seal loss
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The only purpose of a trap is to retain a body of liquid a thus:
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Prevent the entry of sewer gas into a buiding
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Name the 7 ways in which a trap seal may be lost:
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1) Back siphonage
2) Indirect siphonage 3) Oscillation 4) Evaporation 5) Capillary action 6) Leakage 7) Self siphonage |
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What i the minimum distance between the trap and the vent?
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2 pipe diameters
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Crown venting is not permitted why?
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Due to it's tendency to become clogged
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Because the trap seal must be maintained at the weir level, the protecting vent must connect:
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Above the trap level of the weir
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Indirect siphonage is what?
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Loss of a seal due to the discharge of another fixture, usually at a higher level
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Horizontal sanitary drainage pipe is designed to carry no more than:
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65% of it's full capacity
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To prevent self siphonage the vent connection must be:
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Above the level of the trap weir
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A vent pipe is connected to a waste pipe below the level of the trap dip. This will result in loss of the trap seal by:
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Self Siphonage
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To prevent loss of the trap seal by indirect siphonage, it is necessary to ensure that the vent on the drain pipe is located:
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Above the trap weir level
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Indirect siphonage is caused by a change in atmospheric pressure where?
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In the waste pipe serving the fixture trap
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A vent pipe is installed in the fixture drain of a siphonically operated fixture to prevent:
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Indirect siphonage of the siphonic fixture
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Trap seal loss by back pressure is the result of:
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Positive pressure in the waste pipe
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Back pressure is likely to be most severe in the area where a stack:
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Changes direction from vertical to horizontal
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To attempt to control trap seal loss due to back pressure the code states that there may be no drainage connection within the first 1.5m of a stack if the stack: (2)
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Is over 1 storey in height, or receives more than 30 fixture units
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To prevent loss by evaporation of a trap seal service a floor drain, a trap seal primer should be connected to:
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The fixture outlet pipe
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What is the most common cause of trap seal loss?
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Siphonage, both direct and indirect
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The minimum distance between the fixture trap weir and the vent is:
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2 times the pipe diameter
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The distance between the weir of the trap and the vent connection is called the:
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Trap Arm
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Total fall between a fixture p trap and vent connection is equal to or less than:
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One waste pipe diameter
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Minimum slope on the drain between a fixture p trap and it's vent connection is:
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1:50
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A maximum change of direction between the trap weir and it's vent connection for a p trap arm is:
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135 degrees
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A maximum change of direction between the fixture outlet and it's vent connection for siphonic fixtures and s trap standard that discharges vertically is:
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225 degrees
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The maximum developed length of the fixture outlet pipe or the vertical leg shall not exceed:
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1m
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If a vent is connected too close to the trap, it is liable to cause:
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Self siphonage
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If a vent is connected too close to the trap it is called:
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Crown venting
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The minimum length of any trap arm is:
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Twice the diameter of the waste pipe
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The reason for a minimum slope on a fixture waste pipe is to ensure:
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self-cleansing flow through the DWV piping
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The minimum slope on all drainage piping must be at least:
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1 in 400 (1/32")
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A 2" fixture waste is installed with a slope of 1:50. The vent is located 1m from the trap. Air will enter the waste pipe:
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Above the level of the trap seal
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The level above which a vent pipe must be connected to prevent self-induced siphonage is the:
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Weir level
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The maximum length of any trap arm measured from the weir is 1.5m for pipe of:
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1 1/4", 1 1/2" and 2" diameter.
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The maximum change of direction between a p-trap and a vent is:
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135 degrees
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The maximum change of direction between a water closet and it's vent is:
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225 degrees
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A 1.5" waste pipe is installed with a sloe of 1:25. The vent pipe must be connected downstream from the trap no further than:
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950mm (3 feet)
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The fittings permitted between a p-trap and it's vent are:
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3 45 degree elbows
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The minimum distance a vent may be from the weir of a 3 inch trap is:
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150mm
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The maximum distance a vent may be from the weir of it's trap is:
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3.6m
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What is the temperature of the maximum density of water?
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4C / 39.2F
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What is the freezing point of water?
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0C / 32F
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What is the boiling point of water?
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100C / 212F
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When water flashes to steam it expands:
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1700x
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An acceptable back water valve in a storm drain system is:
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Normally open or closed
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Backflow protection for trap seal primers are required to have a:
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22mm air gap
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A bathroom group consisting of 1 flush tank type water closet, 1 wash basin, and 1 bathtub or shower stall has a hydraulic load of how many fixture units? |
6 Fixture Units |
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The sanitary unit having the largest load factors are the: (2) |
1) Direct Flush Water Closet 2) Bed Pan Washer |
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A 4" floor drain has a load factor of how many fixture units? |
6 Fixture Units |
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What is the minimum velocity for sizing horizontal pipe? |
2ft/minute |
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What is the minimum velocity for sizing vertical pipe? |
7ft/sec |
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What will be the minimum diameter of the P-trap for a triple compartment sink if the fixture outlet pipe is 1 1/2"? |
2" |
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What determines an individual vent size? |
The trap size |
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What determines a trap size? |
Fixture outlet pipe size |
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Waste pipe size is always determined by: |
Trap size |
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The downward slope of every drainage pipe that has a size of 3" or less, and every fixture drain is at least: |
1:50 |
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What is the result of too little grade in a pipe? |
Low velocity causing blockage
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The main purpose of venting is to: |
Maintain atmospheric pressure |
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Atmospheric pressure in PSI is: |
14.7 PSI |
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The principle of the siphon is based upon: |
unequal weights of water in the two legs |
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What is the superior form of venting? |
Continuous waste & vent |
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The practical lift of the siphon is: |
33.9 feet |
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Once a siphon is in operation, it continues to flow until when? |
Air is admitted into the inlet portion |
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A primed siphon is what? |
A siphon where the entire tube is filled with water |
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The most common fixture to make use of the siphon is the: |
Water Closet |
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An advantage of venting is that it ___________ pipe size to be used. |
Reduces |
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A vent pipe that is a vertical extension of a vertical waste pipe and includes the vertical waste pipe is a: |
Continuous waste and vent |
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A pipe that is installed to vent a trap off of the horizontal section of a fixture drain or the vertical leg of a water closet is a: |
Back vent |
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A vent pipe that is not a wet vent is a: |
Dry vent |
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Where a trap is to be individually vented, the size of the individual vent is determined by the size of: |
The trap it is to serve |
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When sizing an individual vent, what is not considered? |
Length |
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What is a method of venting where one vent pipe connection serves two fixture traps called? |
Dual venting |
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When sizing a dual vent, is length considered? |
No |
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A vent pipe that is connected at it's lower end to the junction of 2 or more vent pipes and is connected at it's upper end either to a stack vent, vent stack, header, or open air is a: |
Branch Vent |
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A branch vent, vent stack, stack vent, or header shall be of a size: |
Less than the size of a vent pipe that is connected to it. |
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With a branch vent, what must be known before sizing: |
The length |
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A wet vent is a waste pipe that also serves a: |
Vent pipe |
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What is the minimum size of a wet vent? |
1 1/2" |
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What is the maximum length of a wet vent? |
Unlimited |
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What is the max number of water closets in a wet vented group? |
2 |
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When two water closets are installed, they are connected at the same level by means of a: |
Double fitting |
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When wet venting what type of fixture is installed downstream of all other fixtures? |
Water closets |
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Trap arms and fixture drains connected to the wet vent do not exceed what size, except for emergency floor drains? |
2" |
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The load to be considered when sizing a continuous vent that serves a wet vent only includes: |
The hydraulic load that is wet vented |
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When a wet vent extends through more than one storey, the total discharge from any one storey above the first storey does not exceed how many fixture units? |
4 Fixture Units |
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A waste pipe also functioning as a drain is a: |
Wet Vent |
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The minimum distance a wet vent may connect from a fixture trap is: |
2 pipe diameters |
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When a basin is used to wet vent a Water Closet , the wet vent shall not be less than: |
2 inches |
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The grade between the trap weir and the wet vent connection on a trap arm shall not exceed: |
1 pipe diameter of the trap arm |
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If wet venting on multiple floors, not more than how many fixture units per floor can be installed in the wet vent? |
4 Fixture Units |
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What is the maximum hydraulic load in fixture units that can discharge in a vented water closet in a multi-storey building? |
8 fixture units |
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What is the maximum length of nominally horizontal offset in a wet vent for pipes 2" and less? |
1.2m |
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What is the maximum length of nominally horizontal offset in a wet vent for pipes larger than 2"? |
2.5m |
