LP INSTALLERS PRACTICE EXAM QUESTIONS AND
ANSWERS
Where do you file a permit for work to be done in buildings owned or used by the State
of Mass ? - Answers :State Inspector
When pressure testing a system over 1 million btu , which doesn't apply ? - Answers
:Test 1 hour for each 200 ' of developed length
When a vent on a regulator , what is the horizontal distance from the discharge of the
vent to an opening located below ? - Answers :3 feet
How many cycles do you need to keep continuing education certificates ? - Answers :3
On an LP - Gas system , what is considered to be the " Point of Delivery " ? - Answers
:Outlet of 1st stage
How fast does a spill switch need to work ? - Answers :30 seconds
If the firing rate in a combustion chamber exceeds 1,000,000 BTU , but less than
5,000,000 , what is required ? - Answers :2 shut offs in series , or one with overtravel
interlock
What is the maximum pressure allowed for CSST . - Answers :14 " WC
If the maximum firing rate per combustion chamber is ____ , BTU or greater , gas
pressure supervision provided by listed pressure switches or combination high / low
switch , interlocked to accomplish safety shutdown in event of either high or low
pressure . - Answers :1,000,000
Max spacing for support for CSST on a rooftop is every . - Answers :Blocks used for
Support 48 "
A vacuum is considered to be any pressure that is - Answers :Less than atmospheric
pressure (14.7 psi)
If an UG gas line runs under a building , what is required ? - Answers :Conduit must
terminate outside building ,Sleeved in same material as pipe Terminate 4 ' above grade
Apprentice plumber , apprentice gas fitter , or MA Lic . LP Installer - Answers :Must
show license when asked by the Inspector
What is not an acceptable material for LPG piping - Answers :Butylenes
, How far above a forced air inlet must a vent be terminated it within 10 ft horizontally ? -
Answers :3 '
Can you vent into a mechanical vent under a positive pressure ? - Answers :no
What is not an acceptable material for LPG piping ? - Answers :Galvanized
How far above the floor must you have an opening for make - up air ? - Answers :< 12 "
How far can a relief discharge from a rigid LP gas regulator from a Building Opening
below discharge ? - Answers :3'
Which method is not an approved method of connecting pipe ? - Answers :Soldered
When using gas pressure boosters , which of the following apply ? - Answers :All must
meet product - acceptance requirements The serving gas supplier has provided written
authorization Gas pressure boosters shall be located in well - ventilated spaces , and
readily accessible
What percentage of vent height can the length of a single - walled vent connector be ? -
Answers :75 %
What percentage of vent height can the length of Type B , double - walled vent
connector be ? - Answers :100 %
What is the max pressure for natural gas in a house ? - Answers :14 " WC
Within how many feet of an appliance does the shut off need to be ? - Answers :6'
How far does a roof hatch need to be from the edge of a roof to not need guardrails ? -
Answers :6'
Vent termination above a public walkway needs to terminate how high above grade ? -
Answers :7 '
Decorative gas appliance in a vented fireplace must have ? - Answers :Screen door
When opening / adding to a gas system who must be notified prior to commencing work
? - Answers :Local Inspector
When there is suspicion of a defect in the piping system , you must ____ - Answers
:Perform test on system ✓
Installation of fuel gas utilization equipment over BTUs / hr per combustion chamber
shall be governed by 248 CMR 7.00 : Large Gas Utilization Equipment . - Answers
:400,000
ANSWERS
Where do you file a permit for work to be done in buildings owned or used by the State
of Mass ? - Answers :State Inspector
When pressure testing a system over 1 million btu , which doesn't apply ? - Answers
:Test 1 hour for each 200 ' of developed length
When a vent on a regulator , what is the horizontal distance from the discharge of the
vent to an opening located below ? - Answers :3 feet
How many cycles do you need to keep continuing education certificates ? - Answers :3
On an LP - Gas system , what is considered to be the " Point of Delivery " ? - Answers
:Outlet of 1st stage
How fast does a spill switch need to work ? - Answers :30 seconds
If the firing rate in a combustion chamber exceeds 1,000,000 BTU , but less than
5,000,000 , what is required ? - Answers :2 shut offs in series , or one with overtravel
interlock
What is the maximum pressure allowed for CSST . - Answers :14 " WC
If the maximum firing rate per combustion chamber is ____ , BTU or greater , gas
pressure supervision provided by listed pressure switches or combination high / low
switch , interlocked to accomplish safety shutdown in event of either high or low
pressure . - Answers :1,000,000
Max spacing for support for CSST on a rooftop is every . - Answers :Blocks used for
Support 48 "
A vacuum is considered to be any pressure that is - Answers :Less than atmospheric
pressure (14.7 psi)
If an UG gas line runs under a building , what is required ? - Answers :Conduit must
terminate outside building ,Sleeved in same material as pipe Terminate 4 ' above grade
Apprentice plumber , apprentice gas fitter , or MA Lic . LP Installer - Answers :Must
show license when asked by the Inspector
What is not an acceptable material for LPG piping - Answers :Butylenes
, How far above a forced air inlet must a vent be terminated it within 10 ft horizontally ? -
Answers :3 '
Can you vent into a mechanical vent under a positive pressure ? - Answers :no
What is not an acceptable material for LPG piping ? - Answers :Galvanized
How far above the floor must you have an opening for make - up air ? - Answers :< 12 "
How far can a relief discharge from a rigid LP gas regulator from a Building Opening
below discharge ? - Answers :3'
Which method is not an approved method of connecting pipe ? - Answers :Soldered
When using gas pressure boosters , which of the following apply ? - Answers :All must
meet product - acceptance requirements The serving gas supplier has provided written
authorization Gas pressure boosters shall be located in well - ventilated spaces , and
readily accessible
What percentage of vent height can the length of a single - walled vent connector be ? -
Answers :75 %
What percentage of vent height can the length of Type B , double - walled vent
connector be ? - Answers :100 %
What is the max pressure for natural gas in a house ? - Answers :14 " WC
Within how many feet of an appliance does the shut off need to be ? - Answers :6'
How far does a roof hatch need to be from the edge of a roof to not need guardrails ? -
Answers :6'
Vent termination above a public walkway needs to terminate how high above grade ? -
Answers :7 '
Decorative gas appliance in a vented fireplace must have ? - Answers :Screen door
When opening / adding to a gas system who must be notified prior to commencing work
? - Answers :Local Inspector
When there is suspicion of a defect in the piping system , you must ____ - Answers
:Perform test on system ✓
Installation of fuel gas utilization equipment over BTUs / hr per combustion chamber
shall be governed by 248 CMR 7.00 : Large Gas Utilization Equipment . - Answers
:400,000
