GAS FITTERS’ EXAM QUESTIONS WITH VERIFIED ANSWERS

GAS FITTERS’ EXAM QUESTIONS WITH
VERIFIED ANSWERS
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 soft copper tubing? - Answer-6.3.1(F)

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? - Answer-6.2.1(B)

What do first stage regulators compensate for? - Answer-Fluctuations in tank pressure

When adding appliances to an existing system what shall we do? - Answer-5.1.2
Ensure piping can handle additional load

What shall we do to black iron piping installed outdoors above ground? - Answer-7.2.2
Paint it

What do 2nd stage regulators compensate for? - Answer-Fluctuations in downstream
demand

What can cast iron be used for? - Answer-5.6.7.5(5(a)) Flanges

What Can't cast iron be used for? - Answer-5.6.2.1 Pipe

What is Industry best practice pressure drop we design piping systems for - Answer-0.5"
w.c

Do pressure regulators need to be readily accessible? - Answer-5.8.3 No

Do meters need to be readily accessible? - Answer-5.7.2.1 Yes

Do shutoffs need to be readily accessible? - Answer-7.8.2.1 Main gas shutoff valves
controlling several gas piping systems shall be readily accessible for operation and
installed so as to be protected from physical damage

A gas piping installation covered by NFPA 54 includes all fixed piping from where to
where? - Answer-1.1.1.1(A)* After the outlet of the meter for natural gas and after the
outlet of final of the final pressure regulator for L.P.

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-5.7.2.1 Examination / Reading / Replacement / Necessary Maintenance

Who shall we contact to obtain the heating value of the gas used? - Answer-A5.4.2 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-5.8.5.1 Vent to exterior of building, or a regulator and vent limiting means
combination

What will be required when the available supply pressure is higher than what the
appliance is designed for? - Answer-5.8.1 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-5.6.6.1 Tapred

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 PSI) 5.5.4 Maximum pressure shall not exceed

The maximum design operating pressure for any gas piping system shall not exceed? -
Answer-(125 PSIg) 5.5.1 Maximum pressure shall not exceed

According to NFPA54 Gas piping systems shall be sized and installed to satisfy
maximum demand of the system while ensuring what? - Answer-5.4.1 And supply gas
to each appliance inlet at not less than the minimum supply pressure required by the
appliance

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