MCC-NH GAS FITTERS EXAM
QUESTIONS WITH CORRECT ANSWERS
What do 2nd stage regulators compensate for? - Answer-Changes in downstream
demand
What can cast iron be used for? - Answer-Nothing
What Can't cast iron be used for? - Answer-Everything
What is Industry best practice pressure drop we design piping systems for - Answer-0.5"
w.c
Do regulators need to be readily accessible? - Answer-Yes
Do meters need to be readily accessible? - Answer-Yes
Do shutoffs need to be readily accessible? - Answer-Yes
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
What table will be used to determine approximate inputs for typical gas appliance? -
Answer-Annex A Table 5.4.2.1 (A.5.4.2.1)
Gas meters shall be located in ventilated spaces readily accessible for what purposes?
- Answer-Examination / Reading / Replacement / Necessary Maintenance
Who shall we contact to obtain the heating value of the gas used? - Answer-The
Serving Gas Supplier
What CPN covers metallic piping joints and fittings? - Answer-5.6.7
What CPN covers plastic piping joints and fittings? - Answer-5.6.8
Line gas pressure regulators shall be listed in accordance with? - Answer-5.8..2.2
Please explain the two ways we accomplish venting a line gas pressure regulator. -
Answer-Piping a vent at or the installation a vent limiter
What will be required when the available supply pressure is higher than what the
appliance is designed for? - Answer-A Line Pressure Regulator
, Normal ASP for LP gas is? - Answer-11"w.c. to 14" w.c.
1 cubic foot of LP gas approximately contains how many BTU's? - Answer-2,500 BTU
(2.5 mBTU)
Metallic pipe threads shall be what? - Answer-Cut to specific lengths and sized using
the charts
Normal manifold pressure for LP gas is? - Answer-10"w.c.
Normal manifold pressure for natural gas is? - Answer-3.5"w.c.
The maximum design operating pressure for piping located inside a building shall not
exceed? - Answer-5 PSIg
The maximum design operating pressure for any gas piping system shall not exceed? -
Answer-125 PSIg
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
Normal ASP for Natural gas is? - Answer-3.5"w.c. to 8"w.c.
Please convert the following appliance input into the most appropriate unit of
measurement for the use with the charts pertaining to natural gas. 150,000 BTU/Hr. -
Answer-150, = 60cuft
1 cubic foot of Natural gas approximately contains how many BTU's? - Answer-1,000
BTU
What shall be requirement to be included on a piping plan? - Answer-Location ,
Sections , Segments, Outlets, Legend, Available Supply Pressure.
Who determines where the point of delivery will be? - Answer-The Serving Gas Supplier
What type of Plastic piping shall be used as gas pipe? - Answer-Polyethylene Pipe or
Polyamide
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.
What is the purpose of an excess flow valve? - Answer-Stop the flow of gas when flow
exceeds the rating of the valve (such as a major pipe rupture)
QUESTIONS WITH CORRECT ANSWERS
What do 2nd stage regulators compensate for? - Answer-Changes in downstream
demand
What can cast iron be used for? - Answer-Nothing
What Can't cast iron be used for? - Answer-Everything
What is Industry best practice pressure drop we design piping systems for - Answer-0.5"
w.c
Do regulators need to be readily accessible? - Answer-Yes
Do meters need to be readily accessible? - Answer-Yes
Do shutoffs need to be readily accessible? - Answer-Yes
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
What table will be used to determine approximate inputs for typical gas appliance? -
Answer-Annex A Table 5.4.2.1 (A.5.4.2.1)
Gas meters shall be located in ventilated spaces readily accessible for what purposes?
- Answer-Examination / Reading / Replacement / Necessary Maintenance
Who shall we contact to obtain the heating value of the gas used? - Answer-The
Serving Gas Supplier
What CPN covers metallic piping joints and fittings? - Answer-5.6.7
What CPN covers plastic piping joints and fittings? - Answer-5.6.8
Line gas pressure regulators shall be listed in accordance with? - Answer-5.8..2.2
Please explain the two ways we accomplish venting a line gas pressure regulator. -
Answer-Piping a vent at or the installation a vent limiter
What will be required when the available supply pressure is higher than what the
appliance is designed for? - Answer-A Line Pressure Regulator
, Normal ASP for LP gas is? - Answer-11"w.c. to 14" w.c.
1 cubic foot of LP gas approximately contains how many BTU's? - Answer-2,500 BTU
(2.5 mBTU)
Metallic pipe threads shall be what? - Answer-Cut to specific lengths and sized using
the charts
Normal manifold pressure for LP gas is? - Answer-10"w.c.
Normal manifold pressure for natural gas is? - Answer-3.5"w.c.
The maximum design operating pressure for piping located inside a building shall not
exceed? - Answer-5 PSIg
The maximum design operating pressure for any gas piping system shall not exceed? -
Answer-125 PSIg
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
Normal ASP for Natural gas is? - Answer-3.5"w.c. to 8"w.c.
Please convert the following appliance input into the most appropriate unit of
measurement for the use with the charts pertaining to natural gas. 150,000 BTU/Hr. -
Answer-150, = 60cuft
1 cubic foot of Natural gas approximately contains how many BTU's? - Answer-1,000
BTU
What shall be requirement to be included on a piping plan? - Answer-Location ,
Sections , Segments, Outlets, Legend, Available Supply Pressure.
Who determines where the point of delivery will be? - Answer-The Serving Gas Supplier
What type of Plastic piping shall be used as gas pipe? - Answer-Polyethylene Pipe or
Polyamide
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.
What is the purpose of an excess flow valve? - Answer-Stop the flow of gas when flow
exceeds the rating of the valve (such as a major pipe rupture)
