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Journeyman Plumbing- Questions and Answers
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Journeyman Plumbing- Questions and Answers
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Journeyman Plumbing- Questions and AnswersA flow control device will not be required for interceptors/separators that are designed to
provide a retention capacity of? CORRECT ANS-30 minutes or less
What interceptor/separator is prohibited? CORRECT ANS-Water cooled interceptor
Formula for sizing grease traps? CORRECT ANS-L x W x H of sink compartment for cubic
inches. L x W X H X 7.5 gallons > then we divide cubic inches by 231 > divide by 75% > then
calculate flow rate by 1 minute
Minimum size vent for grease traps outside of buildings? CORRECT ANS-4"
How many toilets and fixture units can be installed on a 3" horizontal branch? CORRECT ANS-
2 water closets and 34 fixture units
How many fixture units can be installed on a 1 1/2" branch drain? CORRECT ANS-3 fixture
units
How many fixture units can be installed on a 2" branch? CORRECT ANS-6 fixture units
A 4" soil stack could carry how many fixture units? CORRECT ANS-240 fixture units
A chimney residential type gas utilization equipment shall extend at least how much feet above
the highest point where it passes? CORRECT ANS-3 ft
A type B vent chimney is 24' ft high, how far could you run a single wall gas vent horizontally?
CORRECT ANS-18'
,What is the minimum air space in a " clearance reduction system " used between a combustible
wall,spacer and non combustible surface? CORRECT ANS-1"
A shower base containing 18 sq ft would equal how many square inches? CORRECT ANS-18 x
144 = 2592 sq inches
How much material would be needed to make a piece of 12" smoke pipe and 9' in length?
CORRECT ANS-D x 3.14 x H
1' x 3.14 x 9 = 28.26 sq ft
Cleanouts on 3" shall be installed so that there is how many inches for purpose of clearing
stoppages? What about 4"? CORRECT ANS-12" on 3" and 18" on 4"
What is a Hoar Frost? CORRECT ANS-Pipe freezing at vent terminal
The diversity factor is based on ranges with a minimum BTU rating of? CORRECT ANS-63,000
BTU's or more
What is the melting point if gas tubing is brazed? CORRECT ANS-1000 degrees Fahrenheit
What is the minimum clearance of a draft hood relief opening? CORRECT ANS-Minimum of
6"
Maximum size vent connector allowed? CORRECT ANS-18"
Vertical vent size limitation? CORRECT ANS-2 ft (7 times rule)
What are the sizes of a gas trap's base and walls? CORRECT ANS-8"
,Gas trap outlet and vent size? CORRECT ANS-4"
What are the factor values for 1/2", 3/4" , 1" water pipe? CORRECT ANS-1/2" - 2
3/4" - 6
1" - 12
The servicing area for gas equipment installed in an attic shall be? CORRECT ANS-Lighted and
floored
L. P. & Natural Gas systems can be installed in the same building when? CORRECT ANS-
Approved by inspector
Above ground gas piping outside passing through a foundation shall be? CORRECT ANS-
Sleeved
What is the maximum story height CPVC can be installed in an approved building? CORRECT
ANS-6 stories
What is the minimum size local vent for a bed pan washer? CORRECT ANS-2"
When sheet copper is used in plumbing, minimum thickness shall be? CORRECT ANS-
12oz/sqft
What is the minimum vertical height a B-Type vent extends above the highest connected flue
collar? CORRECT ANS-5ft
1 gallon = 24 ft of square area. True or False? CORRECT ANS-True
, Travel CORRECT ANS-The Distance from the initial offset to the second fitting
Advance CORRECT ANS-Distance parallel to the pipes between the offset fittings
Offset CORRECT ANS-Distance the pipe is offset from original position to new position
Rolling offsets formula CORRECT ANS-Travel = Rise x 2 = Spread x 2
What are the three ways water is present? CORRECT ANS-Solid - Ice
Liquid - Water
Gas - Steam
Pressure formula? CORRECT ANS-Pressure= Head x .434
Head Formula? CORRECT ANS-Head = Pressure x 2.3
Calculate the travel of 45 degree offset with a rise of 8" and a spread of 20" CORRECT ANS-
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? CORRECT ANS-Pressure = Head x .434
30 x .434 = 13.02 loss ( Uphill )
60 - 13 = 47
Answer = 47 psi
Volume of a pipe formula? CORRECT ANS-.0408 x D^2 x L
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