MCC-NH Gas Fitters Exam Questions and Answers

MCC-NH Gas Fitters Exam Questions and
Answers
Question 1
Which Table shall be referenced to design a gas piping system to have no more than
a .5" W.C. pressure drop for the following conditions; natural gas, 6" W.C. available
supply pressure and black iron pipe?
Correct Answer
6.2.1(B)



Question 2
Please explain how to separate gas in one piping section and a test medium in
another section?
Correct Answer
their must be 2 valves (closed) with an opening between them to outside (to allow
test medium to escape)



Question 3
A pressure test usually only occurs under two circumstances
Correct Answer
New branches, or new installation



Question 4
Please give the definition of Service Head Adapter as found in NFPA 54.
Correct Answer
A transition fitting for use with plastic piping (which is encased in non-pressure-
carrying metal pipe) that connects the metal pipe casing and plastic pipe and tubing
to the remainder of the piping system.




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,Question 5
How do we isolate appliances and equipment that are designed for pressures as high
as those used in the pressure test?
Correct Answer
By closing the appliance shut-off



Question 6
When shall a permit be secured?
Correct Answer
When ever replacing the appliance or opening the system



Question 7
What must be done to piping which passes through a foundation wall underground?
Correct Answer
Underground piping, where installed through the outer foundation or basement
wall of a building, shall be encased in a protective sleeve or protected by an
approved device or method. The space between the gas piping and the sleeve and
between the sleeve and the wall shall be sealed to prevent entry of gas and water.
(7.1.5)



Question 8
When does a license expire?
Correct Answer
At the end of the birth month



Question 9
What is the required test pressure?
Correct Answer
a minimum of 3 PSIg




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,Question 10
Which table shall be referenced to design a gas piping system to have no more than
a, .5" W.C. pressure drop for the following conditions; LP gas, 11" W.C. available
supply pressure and black iron pipe?
Correct Answer
6.3.1(D)



Question 11
What is the maximum test duration regardless of volume?

Correct Answer
24 Hours



Question 12
How do we isolate appliances and equipment not intended to be included in the
pressure test?
Correct Answer
Disconnecting them and capping the outlets



Question 13
What type of Plastic piping shall be used as gas pipe?
Correct Answer
Polyethylene Pipe or Polyamide



Question 14
What table will be used to determine approximate inputs for typical gas appliance?
Correct Answer
Annex A Table 5.4.2.1 (A.5.4.2.1)




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, Question 15
What code covers the 1st and 2nd stage regulators on a LP system?
Correct Answer
NFPA58



Question 16
What CPN covers plastic piping joints and fittings?
Correct Answer
5.6.8



Question 17
Please list the general considerations for sizing of gas piping systems.
Correct Answer
Provide a supply of gas sufficient to ensure all appliances receive not less then the
minimum supply pressure under maximum demand conditions



Question 18
What methods of connection are we allowed to use with steel pipe?
Correct Answer
Flanges, Welding, Brazing, Press Connect



Question 19
What will be required when the available supply pressure is higher than what the
appliance is designed for?
Correct Answer
A Line Pressure Regulator




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