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Flashcards in Plumbing Deck (85)
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The minimum fresh air ventilation rate recommended by ASHRAE Standard 62 is A. 5 cfm/person B. 10 cfm/person C. 15 cfm/person D. 20 cfm/person

C. 15 cfm/person


True or false: A Hydropneumatic system is a water supply system that uses the existing pressure in the water main to supply fixtures for small low-rise buildings with a moderate demand. A pump can be incorporated to increase distribution.



Which of the following types of copper pipe is most commonly used for supply lines in building plumbing systems? A. DWV B. Type K C. Type L D. Type M

C. Type L Type L is the most commonly used copper pipe for building supply lines. K is used for underground M is the thinnest type and used for low pressure only DWV is only used for drainage, waste, and vent piping


What type of copper pipe is normally used as underground pipe?

Type K, the heaviest type of copper pipe


What are the types of plastic pipes?

Polyethylene (PE): plastic pipe and tubing

• Acrilylonitrite Butadiene Styrene (ABS): plastic pipe, black, used only fordrain lines.ABS's light weight and ability to be injection molded and extruded make it useful in manufacturing products such as drain-waste-vent (DWV)

• Polyvinyl Chloride (PVC): plastic pipe, white, used for supply in mains

• Polyvinyl Dichloride (PVDC): (okay for hot water)


What factor is dependent on building height? A. calculation of fixture units B. size of pressure tank C. determination of static head D. capacity of the submersible pump

C. determination of static head


Which of the following domestic water heating systems would yield the lowest operating costs for a duplex residential unit? A. active closed-loop solar B. direct-fired storage tank C. ground-source heat pump D. tankless instantaneous

A. active closed loop solar A solar water heating system would have the lowest long-term operating cost because no fuel cost would be involved A standard direct-fired storage tank unit would require purchasing gas, oil, or some other type of fuel to heat the water. A ground source heat pump would not be able to supply water hot enough for domestic use and is inappropriate for this application; ground source heat pumps are used for heating the home, not water. A tankless instantaneous init would incur ongoing expenses due to its use of electricity and is not appropriate for general household domestic hot water generation.


True or false. Ground source heat pumps are used as a heat source for DHW?



What type of water heater is the least efficient for domestic use?

indirect, tankless Water is heated in a furnace or boiler whose primary purpose is to provide space ehating for the building. Therefore, to maintain desired quantities of hot water at all time, the furnace would have to operate during warm periods when space heating is not required. Generally, this type of heating system us used in conjunction


What is a stack vent?

It is a vent through the roof that connects directly to the uppermost part of a soil stack or a waste stack. Generally, other vent lines are connected to it above the branch line from the highest fixtures in the building.


What is a soil stack?

A drainage pipe that serves the toilet


What is a vent stack?

A vent that is separate from the soil or waste stack. A vent stack is typically used to vent fixtures below the topmost fixture in a building


What is a waste stack?

a pipe that serves only sinks and the like without being connected to a toilet


Which of these is the most important concern in relation to a private water supply? A. fixture pressure B. hardness C. friction loss D. yield

B. hardness Hardness affects the quality and taste of water as well as the longevity of the plumbing system. Very hard water can deposit minerals that build up in pipes and on plumbing fixtures. THe taste may be objectionable, requiring installation of a water softening or filtration system.


A graywater system would most appropriately be integrated into a A. laundromat B. office building C. residence D. restaurant

A. laundromat Grawwater systems, when allowed by local building and health departments, are most appropriately used where the ratio of nonpotable water needs is relatively high. A laundromat would produce a great amount of wastewater that could be captured for other purposes.


True or false. Drain should always slope a minimum of 1/8 in/ft.

false minimum slope of drains depends on the size of the pipe. Drainage slopes are 1/4” per foot for typical effluent waste lines. Drains are 45 degrees for waste lines that are gravity only. For pipes larger than 3 in, a slope of 1/8 in/ft is sometimes allowed. 


True or false. THe vent stack extends through the roof?

false The vent stack may extend through the roof, but this is not required. In many cases, the vent stack connects with the stack vent above the highest fixture served by the stack.


Water hammer is most likely to occur when A. the incorrect type of valve is used B. water suddenly stops because the flow is turned off C. expansion joints are not installed in water lines D. water flows backward against a check valve

B. water suddenly stops because the flow is turned off Water hammer occurs when a valve is suddenly turned off and causes the water to stop, forcing the pipes to shake


One component of a plumbing system common to every building is a A. stack vent B. vent stack C. backflow preventer D. house trap

A. stack vent A stack vent extends a soil or waste stack to vent through the roof, and every stack must have one of these. A vent stack is a separate vent connected to a waste or soil stack in a multistory building, so not every building has this. A hosue trap is not mandatory in many codes, and a backflow preventer is not required in any plumbing installations


Several types of plastic can be used for cold water, but which type of plastic pipe may be used for hot water piping?



What is the primary disadvantage of steel pipe over copper pipe?

It is more labor intensive and requires more space in plumbing chases.


True or false. Type M pipe is normally specified for most interior plumbing

false Type M is only used for low-pressure piping. Type L is the one most commonly used in plumbing installations.


What is the minimum yield for a private well?

5-10 gpm


What is the typical psi of a water main?

50 psi but it can vary from 40-80 psi


Static Head:

the pressure required to overcome friction and push water vertically, or the
pressure caused at the bottom of a column of water. Measured in inches of water


Total Pressure:

pressure measured by a pilot tube, consisting of static pressure and
velocity pressure.


Pilot Tube: 

instrument used with a manometer or pressure gauge to measure the
velocity of air or water in a duct or pipe


Storm Drains:

drained by gravity and require large pipes



measure of the acidity or basicity of a solution on a scale of 1 - 14, where 7 is
neutral, less is acidic, and more is alkaline


 Hard Water:

water that contains mineral deposits that can clog up piping, cause mineral
build up in heat exchangers, and place a toll on hydronic systems