Journeyman Plumbing
Travel - Answer- The Distance from the initial offset to the second fitting
Advance - Answer- Distance parallel to the pipes between the offset fittings
Offset - Answer- Distance the pipe is offset from original position to new position
Rolling offsets formula ...
Journeyman Plumbing
Travel - Answer- The Distance from the initial offset to the second fitting
Advance - Answer- Distance parallel to the pipes between the offset fittings
Offset - Answer- Distance the pipe is offset from original position to new position
Rolling offsets formula - Answer- Travel = Rise x 2 = Spread x 2
What are the three ways water is present? - Answer- Solid - Ice
Liquid - Water
Gas - Steam
Pressure formula? - Answer- Pressure= Head x .434
Head Formula? - Answer- Head = Pressure x 2.3
Calculate the travel of 45 degree offset with a rise of 8" and a spread of 20" - Answer- Travel =
21.54 x 1.414 = 30.45
Answer = 30 1/2"
Pressure is 60 psi, you must run a water service to a house built on a 30 foot rise. What is going
to be the pressure at the house? - Answer- Pressure = Head x .434
30 x .434 = 13.02 loss ( Uphill )
60 - 13 = 47
Answer = 47 psi
Volume of a pipe formula? - Answer- .0408 x D^2 x L
Calculate the volume of a tank ( pipe ) 20 feet in height, with a diameter of 48" - Answer-
Answer = 434,294,78 cu inches
* when we have cubic inches, must multiply volume by 231
(1880.06 gallons x 231)
Calculate 1 1/2" pipe with an advance of 48" - Answer- Answer = 64 7/8 "
Travel = 1.414 x advance
1.414 x 48 = 67 7/8 "
Minus 3 ( 1 1/2 for both fittings )
= 64 7/8"
Payment formula? - Answer- Payment = Base x Rate
Rate formula? - Answer- Rate = Payment divided by Base
You estimated a job at $2195, you need $900 upfront, what is the percent you collect upfront? -
Answer- Answer = 41%
Rate = 900 divided by 2195 = 41%
,When calculating offsets, what must be given? - Answer- Offset(Base) and Advance(altitude)
When can you use PVC schedule 40 water pipe? - Answer- Cold Water distribution systems
When can you use CPVC water pipe and fittings? - Answer- Cold + Hot water distribution
water systems
What is the blue print symbol for cold water? - Answer- Long line - long line - Long line -
Blue print symbol for hot water return line? - Answer- Long line short line short line long line
Potable Water, Sanitary Drainage, Fuel Gas piping, Storm Water. Which one is not included in
Plumbing Systems in buildings? - Answer- Fuel Gas Piping
What is Galvanic action? - Answer- Electrolytic chemical reaction between dissimilar metals
such as copper and iron
What is the most common scales used in building drawings - Answer- 1/8" = 1' and 1/4" = 1 '
Wall hung water closet bowls shall be? - Answer- Rigidly supported by concealed metal
supports
On a gas water heater, what is a thermocouple? - Answer- Small electric generator
Difference between a sink and a lavatory? - Answer- Sinks = functional units Lavatory =
Washing fixture
How are drainage and venting in buildings larger than 5 buildings larger than 5 stories high
tested? - Answer- You test each 5 story section with a 10 ft head of water
What prevents a chemical sink from being damaged? - Answer- Continually running water and
being manufactured out of chemical resistance materials
What is the purpose of a dip tube on a water heater? - Answer- Transfers water from inlet to
bottom of tank and helps prevent backsiphonage by having small hole at the top of the dip tube
Air test on water supply lines? - Answer- 1 1/2 times the working pressure or 150 psi, which
ever is larger
What is the type of heating element used in electric water heaters? - Answer- Resistance
heating elements
Primary purpose of vent line in a water closet is? - Answer- Prevent loss from trap seal
What are the 2 primary water sources for public potable drinking water? - Answer- Surface and
ground water
What is a cross connection? - Answer- When 2 separate piping systems one potable and one
undesirable flow into each other
Example: Garden hose attached to a silcock with the other end lying in a cesspool
, What is the hydrologic cycle? - Answer- A continuous exchange of water among atmosphere,
the earth, and water bodies
What device can be used to add a small amount of water to a floor drain trap to ensure an
adequate trap seal? - Answer- Trap Primer
What temperature is necessary for brazing and then adding the filler? - Answer- 840 degrees
Fahrenheit
Three dimensional drawing of a plumbing system is called? - Answer- Isometric
Most common individual vent is called? - Answer- A continuous vent
A vertical pipe installed to provide circulation of air to and from the drainage system is called? -
Answer- A Vent Stack
Drain fixture unit rating for a kitchen sink? - Answer- 2 DFU
Drain Fixture Unit
The fitting that mounts under the drain plug on a bathtub waste and overflow is called? -
Answer- Waste Shoe
What is the maximum volume of water to flush a water closet? - Answer- 1.6 gallons
Energy Policy Act of 1992
What valve is used that has a flush device actuated by direct water pressure to supply a fixed
quantity of water for flushing devices? - Answer- Flushometer
What is the drainage pipe extending horizontally from a soil or waste stack or building drain,
with or without sections or branches? - Answer- Horizontal branch drain
How much does 1 foot of cubic water weigh? - Answer- 62 1/2 lbs
The distance between the crown weir and top of the trap is? - Answer- A Trap Seal
What is an Air Gap? - Answer- Unobstructed vertical space between the water supply and
flood rim of the receptacle
A valve that permits fluid flow in only one direction and close automatically to prevent back flow
is called? - Answer- A Check Valve
What is the maximum flush volume to a urinal? - Answer- 1 gallon per minute
How high is the water level in comparison to the overflow tube in a flush tank assembly? -
Answer- Level should be 3/4 below top of overflow tube
What is PE pipe? - Answer- Polyethylene Pipe
Example: CSST tubing, black pipe for wells and sprinkler systems, sold in coils
How is PE pipe joined together? - Answer- Plastic insert fittings and clamps
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