Plumbing Year 3 Midterm
When potable water is discharged into the drainage system, it shall be through an air-gap no less than _______ inch(es).
1
Convert each measurement below to engineer's measure. 32' 9"
32.75'
Where unavoidable, gas piping underground beneath the building shall be encased in ________.
Condult
The temperature of which the water vapor contained in typical combustion flue gases condenses into water is called the ____________ temperature
Dew point
An impairment of the quality of the potable water to a degree that does not create a hazard to the public health but which does adversely and unreasonably affect the aesthetic qualities of such water for domestic use Also defined as Low Hazard.
Pollution
A water heater vented into a fireplace or a chimney serving a fireplace is ________.
Prohibited unless the fireplace flue opening is permanently sealed
A reclaimed water system shall not have any connection to potable water system without _______.
Protection against back-siphonage/back pressure
Reclaimed water systems are not approved for ______________.
Public access hose bibbs
Requirements for installing gas heaters in residential garages and adjacent spaces that open to the garage are:
-If directly on the floor, must be flammable vapor ignition resistant (FVIR) -If access is outside of the garage, combustion air must come from the exterior -Protection from moving vehicles -Burners not less than 18" above the floor
In order to properly size a water supply system for a home, we must know what?
-The height of the highest fixture above the meter -The lowest water pressure in the area -The total of all fixture units in the home or building -The distance of the most remote outlet (fixture) to the meter
Single wall vent connectors shall:
-The length of a horizontal vent connector is limited to no more than 75% of the height of the chimney -Avoid sags or dips -Be fastened by sheet metal screws -Be graded no less than 1/4" per foot
To combine spaces to provide for enough combustion air for gas fired appliances you must provide:
-Vent opening(s) of not less than 100 square inches -One vent opening within 12" of the ceiling -Opening(s) not less than one square inch per 1,000 Btu/hr -One vent opening within 12" of the floor
Pressure drop can be caused by:
-Water filters -Water softeners -Tankless water heaters -Double check valves
The size of the supply piping outlet for any gas appliances shall not be less than _______ inch.
1/2
Convert each measurement below to builder's measure. 123.44'
123' 51/4"
Convert each measurement below to engineer's measure. 18' 6"
18.5
Bathtub supply FUs are __________ (according to Idaho rules, not UPC).
2
Clothes washer supply fixture units are _________ (according to Idaho rules, not UPC).
2
Using the "Standard Method" mentioned in 506.2.1, how many cubic feet of space will be needed for a water heater with a draft hood that burns 40,000 Btus/hr?
2,000
Corrugated metallic chimney liner must be sized by using table 510.1.2(1) for type B vent, but it't maximum capacity must be reduced by ________ per cent.
20
The volume of a length of pipe that is 2 inches in diameter and 6 feet long is _________.
226.1952 inches cubed
The passageway for a water heater in an attic shall be unobstructed and shall have a solid flooring not less than ______ inches wide from the entrance to the water heater.
24
The diameter of the large pipe is 18". The distance between the small pipe and large pipe is now 3". What is the CC length of pipe J?
24"
On a typical draft hood equipped appliance, the total volume of dilution air and combustion gases that must be vented equals _________ cubic feet for each cubic foot of natural gas burned.
30
Offsetting ells are 45s. All measurements are as noted. What is the CC length of pipe N?
30 1/16"
If D equals 22" and all other measurements are as noted, what is the CC length of pipe M?
30 3/16"
If D equals 12" and all other measurements are as written, what is the CC length of pipe J?
31 1/4"
A red color on a gas meter index indicates a gas pressure ___________.
5 pounds
If the weight of a full tank of water in a water heater is 416.5 pounds, the volume of the tank is _______ gallons.
50
To properly size a gas vent connected to two appliances, the area of the vent needs to be at least the size of the larger draft hood or outlet plus _________ percent of the smaller draft hood or outlet.
50
Combustion air supplied by using the "standard method" requires a minimum volume of _______.
50 cu ft per 1,000 btu/hr
A shutoff valve shall be installed on fireplaces within _______ feet.
6
Horizontal 1/2 inch diameter steel gas piping shall be adequately supported at intervals not exceeding ______ feet.
6
Electrical grounding of CSST gas piping when it enters the building shall use what size copper wire?
6 AWG
The approximate minimum demand of a domestic gas range in Btu per hour is _________.
65,000
The rolling offset is using 45s and all measurements are as noted, what is the CC length of pipe M?
8 3/4"
Convert each measurement below to builder's measure. 84.27'
84' 3 1/4"
A gas vent, 12 inches or smaller in size, and located not less than 8 feet from a vertical wall or similar obstruction shall terminate above the roof a minimum height of _________.
According to the pitch of the roof
Gas meters shall not be placed _________.
Adjacent to a driveway
"Rough Piping Inspection" of gas piping shall be made ___________.
All of the above
The definition of grey water is _________.
All of the above
Which of the following principles has the greatest impact on category 1 appliance venting?
All of the above are equally important
Gas vents serving category 1 appliances on more than one floor are _______.
Allowed if the appliances are located in roooms separated form habitable spaces
The remaining space surrounding a chimney liner shall not be used to vent another appliance unless ____________.
Another liner is inserted in that space
A mathematical process used to accomplish a specific task is known as ________.
Applied mathematics
During normal operation of a double-check valve assembly, ___________.
Both check valves are open
It shall be unlawful to remove or disconnect any gas piping without ___________.
Capping or plugging the gas pipe outlet with a screw joint fitting
Match the type of back-flow prevention devise with it's probable use. Reduced Pressure Vacuum Breaker (RP)
Car wash equipment, boiler make-up water
An impairment of the quality of the potable water that creates an actual hazard to the public health through poisoning or through the spread of disease by sewage, industrial fluids, or waste. Also defined as high hazard.
Contamination
For backflow to occur, there must be a(n) _________.
Cross-contamination
To obtain the cubic feet per hour of fuel gas required for any gas appliance ___________.
Divide the Btu input of the appliance by the average Btu heating value per cubic foot of gas
Heavy-duty protection in low-hazard, continuous-pressure applications is provided by installing a(n) __________.
Double-Check valve assembly
See 510.1.2 single appliance vents with zero lateral lengths in tables 510.1.2(1), (2), and (3) shall have no ________.
Elbows
Devices used to shut off the flow of gas when pipes or hose lines break are called __________.
Excess flow valves
T/F An atmospheric vacuum breaker may be installed with a valve downstream.
False
Which category 1 natural draft appliances remain off for long periods of time, the vent system could do with of the following when the appliance first turns on?
Flue gases will spill out the draft hood until the vent heats up
A gas appliance regulator shall not be vented to the ___________.
Gas equipment flue or exhaust system
In buildings where potable and non-potable water is installed, the potable water shall be marked with ____________ paint or tape.
Green background with white lettering
Compared with air, LP gas is _________.
Heavier
Application for backflow preventers that could affect public health are classified as ________.
High hazard
Match the type of back-flow prevention devise with it's probable use. Hose Connection Backflow Preventer
Hose faucets, indoor and outdoors
Increasing the velocity of water in a pipe _________ friction.
Increase
Each of the following is a common cause of friction in a water supply system except _______.
Increased water temperature
Match the type of back-flow prevention devise with it's probable use. Airgap
Indoor faucets and fixtures
One way to reduced friction caused by pipes is to use _________ pipe.
Larger diameter
Match the type of back-flow prevention devise with it's probable use. Pressure Vacuum Breaker (PVB) Water-source heat pumps
Lawn sprinklers before the zone valves
Match the type of back-flow prevention devise with it's probable use. Atmospheric Vacuum Breaker (AVB)
Lawn sprinklers downstream of the zone valves
Leak testing of gas piping inside a structure is conducted with a device called a ________.
Manometer
Natural gas consists primarily of ____________.
Methane
Combustion air ducts that terminate in an attic shall _________.
Not be screened
A type B vent is used for venting a listed or approved appliance equipped to burn ______.
Only gas
Providing pipe-bundle weight information to the crane operator is the responsibility of the ________.
Plumber
Turbulent flow is ________.
Random flow along a rough surface
The most sophisticated type of backflow preventer is the __________.
Reduced-pressure zone principle backflow preventer assembly
Friction _______ the pressure in a water supply system.
Reduces
Combustion air ducts shall ________.
Serve a single space
A gas pressure regulator shall be accessible for __________.
Servicing
Laminar flow is _________.
Smooth flow at or below 1 foot per second
Which sizing table will be used when venting a single appliance the uses a single wall vent connector?
Table 510.1.2(2)
When sizing a water supply system, you can assume that there will be enough pressure in the system if adequate pressure is provided to _______.
The highest fixture in the system
The type of backflow preventer required for a particular application is specified by ___________.
The local code or health department
The minimum pipe size for any flushometer valve of any category is ________.
The same as the valve inlet
Match the type of back-flow prevention devise with it's probable use. Ball-cock vacuum breaker
Toilet tanks
An accessible gas shutoff valve shall be provided ________ of each gas pressure regulator.
Upstream
The pipe or duct that connects a fuel-gas-burning water heater to a vent or chimney is a ________.
Vent connector
When testing a gas piping system for leaks, fill the pipe with air or gas, apply soap and water to the connections, and __________.
Watch for bubbles
Match the type of back-flow prevention devise with it's probable use. Double Check Valve (DC)
Water-source heat pumps. Pressure Vacuum Breaker (PVB)
Of the six simple machines, the most common is probably the __________.
Wheel and axle
Leaks in gas piping shall be located __________.
With a gas detector
Piping with non-potable water shall be marked with __________ paint or tape.
Yellow background with black lettering
Run = 84' Drop = [a] Grade = 1/8" per foot Percent Grade = [b]
[a] - 10 1/2" or 10.5" [b] - 1%
For urinals, the first flushometer on a branch line is valued [a] WSFUs, the second is valued [b] WSFUs and the fourth is valued at [c] WSFUs.
[a] - 20 [b] - 15 [c] - 8
Mechanical draft venting systems (sometimes called "power vents"), shall terminate at least [a] feet below, [b] feet horizontally, [c] feet above any operable window, door or air inlet into a building and not less than [d] inches from finished grade.
[a] - 4 [b] - 4 [c] - 1 [d] - 12
For a water closet, the first flushometer on a branch line is valued at [a] WSFUs, the third is valued at [b] WSFUs and the sixth on the branch is valued at [c] WSFUs.
[a] - 40 [b] - 20 [c] - 10
Run = 27' Drop = [a] Grade = [b] Percent Grade = 2%
[a] - 6 3/4" or 6.75" [b] - 1/4"
Supplying outside combustion air using the "one permanent opening" method requires that the fresh air duct or opening be within 12" of the [a} and be an opening of not less than one square inch per [b] Btu's.
[a] - Ceiling [b] - 3,000
Copper water piping when installed beneath a concrete slab must be without [a] when possible. If that's not possible, they will be [b].
[a] - Joints [b] - Brazed
When an interior space isn't large enough to supply combustion air to appliances, the first step to properly sizing the outside air duct is: [a] volume must be divided by the [b] volume to obtain a ratio.
[a] - Space [b] - Required
The two categories of flushometer valves are [a] and [b].
[a] - Urinals [b] - Water closet
Water lines within a building shall be tested at not less than [a] with potable water. Or is shall be tested with [b] psi of air pressure for not less than [c] minutes.
[a] - Working pressure [b] - 50 [c] - 15
