MCC-NH Gas Fitters Exam Graded A+
1 cubic foot of Natural gas approximately contains how many BTU's? - ANSWER-1,000
BTU
A gas piping installation covered by NFPA 54 includes all fixed piping from where to
where? - ANSWER-LP- 1st stage regulator
Nat- Outlet of meter set
A gas piping system was installed per code requirements in 2000, and now due to new
or revised code material it no longer meets code, we shall we do? - ANSWER-Contact
the AHJ (it may fall under reciprocity)
A pressure test usually only occurs under two circumstances - ANSWER-New
branches, or new installation
A regulator vent shall be installed to prevent the entry of? - ANSWER-Water / Debris /
Insects
According to NFPA 54,piping shall be supported by what? - ANSWER-Metal
hangers/hooks/bands/brackets
According to NFPA54 Gas piping systems shall be sized and installed to satisfy
maximum demand of the system while ensuring what? - ANSWER-Each appliance
receives not less than the minimum manifold pressure it requires
Are appliances or appliance connectors part of a fixed piping system? - ANSWER-No
Are drips required on LP? - ANSWER-Only If the AHJ requires it, or there is high
moisture levels
Can a single shut off valve be used to separate gas in one piping section and a test
medium in another section? - ANSWER-No
Can oxygen be used as a test medium? - ANSWER-No
Can piping support piping? - ANSWER-No
Can press connect fittings be used with copper tubing? - ANSWER-Yes
Can PVC be used as plastic piping? What is PVC commonly used for? - ANSWER-No
however it is commonly used for vent piping on gas regulators.
Can PVC be used for gas piping underground? - ANSWER-No
, Can you thread schedule 10 steel pipe? - ANSWER-No
CSST shall be installed per what? - ANSWER-Manufacturers I&O
Do meters need to be readily accessible? - ANSWER-Yes
Do regulators need to be readily accessible? - ANSWER-Yes
Do shutoffs need to be readily accessible? - ANSWER-Yes
Do we ever need to determine the volume of a residential piping system to figure out
how long the test duration needs to be? Why or why not? - ANSWER-No, all residential
installations have a minimum of 10 minutes, and a maximum of 24 hours
During pressure tests what shall be left exposed for examination? If piping is concealed
or covered how do we examine the components that are required to be left exposed? -
ANSWER-
Explain what cap all outlets means and how to accomplish this requirement? -
ANSWER-Each outlet, including a valve, shall be closed gastight with a threaded plug
or cap immediately after installation and shall be left closed until the appliance or
equipment is connected thereto. When an appliance or equipment is disconnected from
an outlet and the outlet is not to be used again immediately, it shall be capped or
plugged gastight.
Explain what should happen with the discharge of purged gases? - ANSWER-It should
be purged indoors (if allowed), or outdoors (reference for outdoor purging requirements
8.3.1.3)
Gas meters shall be located in ventilated spaces readily accessible for what purposes?
- ANSWER-Examination / Reading / Replacement / Necessary Maintenance
How do we isolate appliances and equipment not intended to be included in the
pressure test? - ANSWER-Disconnecting them and capping the outlets
How do we isolate appliances and equipment that are designed for pressures as high
as those used in the pressure test? - ANSWER-By closing the appliance shut-off
How do we isolate appliances and equipment that are not designed for pressures as
high as those used in the pressure test? - ANSWER-By closing the shut-offs and
splitting the unions
How long should a pressure test last for piping with a volume greater than 10 cu ft.? -
ANSWER-1/2 hour per 500 cubic feet up to a maximum 24 hours.
1 cubic foot of Natural gas approximately contains how many BTU's? - ANSWER-1,000
BTU
A gas piping installation covered by NFPA 54 includes all fixed piping from where to
where? - ANSWER-LP- 1st stage regulator
Nat- Outlet of meter set
A gas piping system was installed per code requirements in 2000, and now due to new
or revised code material it no longer meets code, we shall we do? - ANSWER-Contact
the AHJ (it may fall under reciprocity)
A pressure test usually only occurs under two circumstances - ANSWER-New
branches, or new installation
A regulator vent shall be installed to prevent the entry of? - ANSWER-Water / Debris /
Insects
According to NFPA 54,piping shall be supported by what? - ANSWER-Metal
hangers/hooks/bands/brackets
According to NFPA54 Gas piping systems shall be sized and installed to satisfy
maximum demand of the system while ensuring what? - ANSWER-Each appliance
receives not less than the minimum manifold pressure it requires
Are appliances or appliance connectors part of a fixed piping system? - ANSWER-No
Are drips required on LP? - ANSWER-Only If the AHJ requires it, or there is high
moisture levels
Can a single shut off valve be used to separate gas in one piping section and a test
medium in another section? - ANSWER-No
Can oxygen be used as a test medium? - ANSWER-No
Can piping support piping? - ANSWER-No
Can press connect fittings be used with copper tubing? - ANSWER-Yes
Can PVC be used as plastic piping? What is PVC commonly used for? - ANSWER-No
however it is commonly used for vent piping on gas regulators.
Can PVC be used for gas piping underground? - ANSWER-No
, Can you thread schedule 10 steel pipe? - ANSWER-No
CSST shall be installed per what? - ANSWER-Manufacturers I&O
Do meters need to be readily accessible? - ANSWER-Yes
Do regulators need to be readily accessible? - ANSWER-Yes
Do shutoffs need to be readily accessible? - ANSWER-Yes
Do we ever need to determine the volume of a residential piping system to figure out
how long the test duration needs to be? Why or why not? - ANSWER-No, all residential
installations have a minimum of 10 minutes, and a maximum of 24 hours
During pressure tests what shall be left exposed for examination? If piping is concealed
or covered how do we examine the components that are required to be left exposed? -
ANSWER-
Explain what cap all outlets means and how to accomplish this requirement? -
ANSWER-Each outlet, including a valve, shall be closed gastight with a threaded plug
or cap immediately after installation and shall be left closed until the appliance or
equipment is connected thereto. When an appliance or equipment is disconnected from
an outlet and the outlet is not to be used again immediately, it shall be capped or
plugged gastight.
Explain what should happen with the discharge of purged gases? - ANSWER-It should
be purged indoors (if allowed), or outdoors (reference for outdoor purging requirements
8.3.1.3)
Gas meters shall be located in ventilated spaces readily accessible for what purposes?
- ANSWER-Examination / Reading / Replacement / Necessary Maintenance
How do we isolate appliances and equipment not intended to be included in the
pressure test? - ANSWER-Disconnecting them and capping the outlets
How do we isolate appliances and equipment that are designed for pressures as high
as those used in the pressure test? - ANSWER-By closing the appliance shut-off
How do we isolate appliances and equipment that are not designed for pressures as
high as those used in the pressure test? - ANSWER-By closing the shut-offs and
splitting the unions
How long should a pressure test last for piping with a volume greater than 10 cu ft.? -
ANSWER-1/2 hour per 500 cubic feet up to a maximum 24 hours.
