Gas piping Flashcards
Copper tubing use for underground service shall be
A)corregated
B)type GP
C) type k or coated type L or G
D) type CU
C) type k or coated type L or G
From the following which contains unacceptable fittings
A) close nipples, street elbows and tees
B) nipples elbows reducing tees unions
C) nipples elbows tees unions
A) close nipples street elbows and teed
what is the required minimum distance plastic piping or tubing must be installed under a commercial parking lot ?
a) 12 “
b) 15”
c) 18”
d) 24”
d) 24”
unions and swing joints made by a combination of fittings shall not be used where piping is to be.
a) concealed
b) exposed
c) a part of a piping extension
d) a part of a branch line
a) concealed
what is the maximum spacing of supports for nps 1 1/4 horzontal gas pipe in a home?
a) 6’
b) 15’
c) 8’
d) 10’
d) 10’
when used above ground, piping of what diameter and over shall have welded joints unless the authority having jurisdiction allows threaded joints.
a) 2”
b) 3”
c) 1 1/2 “
d) 2 1/2 “
d) 2 1/2
a branch line which was used to service a range in the kitchen of a single family home is no longer required. what is required for the termination of this line?
a) a plugged valve, or either a plug or cap made of material compatible with the material of the piping system
b) valve, nipple and another valve in off position
c) valve in off position
d) coupling, nipple and valve
A)a plugged valve, or either a plug or cap made of material compatible with the material of the piping system
For residential piping systems of 100ft or less, having a working pressure less that 2 psig, the piping or tubing shall be pressure tested using either gas, air or inert gas at.
a) 1 psig
b) 5 psig
c) 15psig
d) 30 psig
c) 15 psig
when installing a NPS 2 piping system in a commercial establishment, and branch connections are required for futre additional applicances, and the additional appliances are unknownk, what size must these branch outlets be?
a)NPS 1 1/2
b)NPS2
C)NPS 1
d)not less than the outlet size of the last branch
b) NPS 2
what diameter and length of dirt pocket shall be provided when the drop line is NPS 3?
a) dirt pocket not requred
b) 1” diameter with plug valve nipple and cap
c) 3” diameter by 3” length
d) 2 “ diameter by 3” length
d) 2 “ diameter by 3” length
propane piping in industrial buildings shall be identified
a) with yellow paint or yellow bands
b) with red paint or red bands
c) with paint in a contrasting color to other piping
d) with green paint and yellow bands
A)yellow paint or bands
when purging a piping system to theoutdoors what is the required minimum distance the purging line may terminate from either a building or air intake?
a) 20 ft
b) 10 ft
c) 6 ft
d) 3 ft
b) 10 ft
When is it necassary to purge every branch supply line in a piping system?
Always
which of the following best describes a bellows type meter?
A) one which uses a spinning turbine to drive the index needle
b) one which uses pressure differential across an opening to indicate flow rate
c) one which uses the volume displace through chambers divided by a flexible material to drive dials
d) one which is normally installed on loads over 2 million
c) one which uses the volume displace through chambers divided by a flexible material to drive dials
what does movement of a 1/4 cu. ft. dial indicate when completing a gas meter pressure dial test?
a) the service reg is malfunctioning
b) the static pressure is excessive
c) the working pressure is to low
d) the piping is not gas tight
d) the piping is not gas tight
