Fuel Gas Code Flashcards
The notch for gas piping is located 5’ from the edge of a 2x12 joist. The joist is 12’ long. The notch is on the bottom. What is the maximum height of the notch. (1-1/2”, 2”, 3” or may not be located here)
May not be located here
What is the minimum distance a notch can be made on the edge of a stud before a shield plater is required? (1/2”, 1”, 1-1/2”, or 2”)
1”
Gas pipe shall not be ben though an arc greater than…
90 Degrees
Minimum test pressure for gas pipe is…
3 psi
Which method cannot be used for joints in plastic fuel gas pipe?
Threaded
Which of the following shall not be used for joints on metallic gas pipe?
Soldered
Vent connectors located in attics must be…
Type B or L vents
On a 3” gas line, a pressure tap must be installed a minimum of how far from an MP regulator? (24”, 30”, 36” or 42”)
30”
What is a good cleaner for removing scale from a water cooled condenser? (Iso Alcohol, Sodium Thiosulfate, Nitrogen and Muriatic Acid)
Muriatic Acid
Compressor runs constantly on ac system. Most likely cause is…
(low refrigerant, excessive refrigerant, low voltage or open thermostat)
Low refrigerant
What is the equivalent length of pipe in feet for two 6” 45’s and one 6’ gate valve? (6’,17’, 21’ or 29’)
17’
Vessel with open top is considered confined space if it is atleast how many feet deep (2, 4, 6, 8)
4’
What is the minimum number of openings communicating with outside air required to ventilate a confined space where a gas appliance has a clearance of 1”on both sides and the back and 6” in the front?
1
A gas fired unit heater in a warehouse must have how much clearance from the wall?
18”
When installing a recirculation direct-fired industrial air heater, what provisions must be made? (Ductwork, Make up water, Relief air vent)
Relief air vent
Gas vent terminates through roof with a 12/12 pitch, not at peak of roof. What is the minimum height from the roof to the lowest discharge opening?
4 FT
What is the smallest pipe that can be used on a 165’ piping system designed to carry 900 CFH of gas at 1 PSI and 1/2” water column?
2-1/2”
What is the appropriate size vent for a category one 125,000BTU appliance with Type B double wall vent if using for natural draft with a height of 15FT and a lateral run of 2FT.
5”
A fan assisted 125,000BTU appliance is placed into a room with 65,000BTU natural draft water heater. What is the common “Type B” vent size required if the vent is 23FT high?
5”
How far should the unthreaded portion of piping outlets extend through the floors?
2”
2x12 Joist Question
- 1 1/2
- 1 3/8
- 2 1/8
- 0
0”
2” x 6” question
- 1 1/2
- 1 3/8
- 2 1/8
- 2 1/8
1 3/8
1 CFH = 1000 BTUs
So if BTUs are 100,000, the CFH would be 100
What is CFH for 60,000 BTUs?
60
What is EHD?
Equivalent Hydraulic Diameter
Plastic tubings and fittings should run on top or underneath the ground?
Underneath the ground only
What is a quick closing valve?
Ball valve
Regarding gas piping, shield plates shall be a minimum of _____ inch thick steel and shall cover the area of the pipe where wood member is notched or bored.
1/16 thick
In concealed locations, where piping and other than black or galvanized steel is installed through holes or notches of wood studs, joists, rafters or similar members less than ___.___ inches from the nearest edge of the member, the pipe shall be protected by a shield plate.
1.5 inches
Plastic piping joints and fittings for use in liquefied petroleum gas piping systems shall be in accordance with __.__.__.__. 58
NFPA (National Fire Protection Agency) 58
In the case of cast iron fittings,
flangers are ok?
bushings are ok?
Flangers are ok
Bushings are not ok
Cast iron can be used for gas piping.
true or false
False
The operating pressure for undiluted LP gas systems shall not exceed ______psi.
20 PSI
The maximum design operating pressure for piping systems located inside buildings shall not exceed _____ lbs per square inch gauge. One exception being if the piping system is ___________.
5 lbs per square inch
welded
For other than steel pipe, exposed piping shall be identified by a yellow label marked “Gas” in black letters. The marking shall be spaced at intervals not exceeding ______ Ft.
5 ft
In no case shall the edge of the bored hole be nearer than _____” to the edge of the stud.
5/8 inch
Bored holes not greater than ______% of the depth of the stud are permitted in non-load bearing partitions or in any wall where each bored stud is doubled.
60%
Cutting or notching of studs to a depth greater than _____% of the width of the stud is permitted in non-load bearing walls supporting no weight other than the weight of the partition.
40%
A hole not greater than _____% of the stud depth is permitted to be bored in any wood stud.
40%
In exterior walls and bearing petitions, any wood stud is permitted to be cut or notched to a depth not exceeding ______% of it’s width.
25%
Notches in the top or bottom of the joist shall not exceed 1/__ of the depth and shall not be located in the middle 1/__ of the span.
1/6
1/3
The maximum horizontal length of a single wall connector shall be _____% of the height of the chimney or vent.
75%
Where vents pass through attic space, an insulation shield shall terminate not less than _____” above the insulation materials.
2”
Connectors shall connect to a masonry chimney flue at a point not less than _____ inches above the lowest point of the interior of the chimney flue.
12”
Appliance connectors shall have a maximum _____Ft in overall length, except for range and domestic clothes dryer connections, which shall not exceed ____Ft in overall length.
3 Ft
6 Ft
Regarding gas pipe and MP regulators, a tee fitting with one opening capped or plugged shall be installed not less than ______ pipe diameters downstream of the MP regulator outlet.
10
An appliance gas shut off valve shall be located in the same room as the appliance, not further than _____Ft from the appliance.
6 Ft
The test duration shall be not less than _____ hr for each ______ Ft.
1/2 hr for each 500 ft
The test medium shall be air, nitrogen, carbon dioxide or an inert gas. ___________ shall not be used.
Oxygen
Regarding plastic piping, the radius of the inner curve of such bends shall not be less than _______ times the inside diameter of the pipe.
25 Times
