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84 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is the minimum size of steel gas line that can be installed underground? |
1/2” |
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What is the maximum length of a flexible connecter used to connect an unvented appliance to the gas line? |
6 feet |
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What type of light may be used when searching for a gas leak? |
A light that is class 1 Group D |
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What type of plastic pipe can be used in gas fittings? |
Polyethylene |
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What is the minimum code requirement to seal a gas piping outlet That is not connected to an appliance? |
A cap or plug |
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What type of fittings are to be used on steel or iron pipe? |
Malleable iron |
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What are three approved methods of joining pipe underground? |
Brazed, compression joints and welded |
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What is the minimum distance between the floor and an appliance component capable of igniting a flammable vapour in a residential garage? |
18inches |
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What requirements must be met to reuse fittings in a gas installation? |
They have been used on gas before and are in as good as new condition |
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What are the size limitations for bushings used on gas piping? |
They are made of steel to reduce one or more sizes and malleable iron to reduce two or more sizes |
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What type of connection is approved for joining PE gas pipe? |
Thermal fusion |
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What is the minimum test pressure for a gas line If it is factory coated or wrapped? |
100psi for 15 min |
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What is the minimum rated working pressure of hose and hose fittings? |
350psi |
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What is the maximum length of hose that can be used on a permanent gas installation? |
10 feet |
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What is the maximum pressure than natural gas can be piped into a building? |
65psig |
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What is the minimum specification allowed for copper gaslines installed underground? |
Type L coated |
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What is the minimum size of a future connection? |
The same diameter as the pipe that serves it |
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What is the importance of determining the length of the longest run? |
This length determines the resistance of the piping/tubing therefore the pressure drop |
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What is the maximum distance between hangers/supports for 3/4” steel gas pipe? |
8 feet |
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What is the maximum gas pressure allowed in a single-family dwelling unit? |
2psig |
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What is the maximum pressure that propane gas may be piped into a building for a permanent installation? |
25psig |
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What is the maximum pressure drop allowed for low pressure gas installation? |
1” w.c. |
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What is the maximum pressure allowed for threaded pipe with MI fittings? |
125psig |
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What is the hanger spacing requirement for half inch steel gas pipe? |
6 feet minimum |
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What are the size limitations for malleable iron bushings used on gas piping? |
MI must reduce a minimum of two sizes |
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What is the minimum size of concealed gas piping? |
1/2” |
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What are the length restrictions for construction heater hose? |
Minimum 15 feet maximum 75 feet |
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What is the maximum length of a hose used on a permanent installation? |
120” |
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What is the minimum test pressure for pipe that has been factory coated? |
Minimum 100 psig for 24 hours |
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What is the minimum distance that a gas pipe protrudes through a finished floor? |
2” of unthreaded pipe |
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What is the maximum length of hose used to connect a low intensity infrared heater? |
36” +/- 6” |
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What is the maximum pressure drop allowed for a high-pressure gas line? |
50% of the initial pressure |
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Why are there two different 2psi sizing tables in the code one for 1psi pressure drop and other for 1.5 psi pressure drop? |
One is for residential and the other for commercial appliances |
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What is the advantage of using high-pressure gas installations over low pressure, gas installations? |
It allows smaller pipe/tubing sizes making the installation cheaper |
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In a single family house what is the maximum natural gas or propane gas pressure allowed? |
2psi |
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When fabricating a field constructed welder head, other than the header being a minimum of 2 1/2 inch, what are the size restrictions for the branch pipe? |
The branch pipe cannot be larger than 1/2 of the diameter of the header and never be smaller than 3/4 inch |
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When installing a system regulator on a two psi gas line, where must a vent terminate? |
The vent may have a ball check leak limiter installed in the vent outlet that discharges into a ventilated space |
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What is the minimum test pressure and time duration for CSST’s? |
15 psi for 15 min |
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When selecting a two psi regulator, what information is needed? |
The inlet and outlet pressures as well as the maximum flow capacity of the regulator |
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What is the maximum spacing for labelling tubing used on a gas insulation? |
Every 6 feet |
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A defective section of gas piping or tubing may be repaired by qualified gas fitter
True or false |
False |
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When may a hose be used to connect an unvented appliance? |
When it is mobile or requires insulation from vibration |
RV
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When, connecting a suspended appliance, or a decorative appliance a corrugated metal connecter shall not exceed what length? |
2 feet |
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At what length shall a commercial tubing system be identified? |
At 20 foot intervals |
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What is the maximum size for a purge line for purging a line up to 4” ? |
1/2” diameter |
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The volume of gas required for each appliance should be determined from what? |
The appliance rating plate |
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When a piping system is purged outdoors, the purge point must not terminate closer than what length from a building or an air intake? |
10 feet |
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The maximum range of a test gauge should exceed the test pressure by at least _______but not greater than ________ |
15% but not greater than 300% |
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A test, Gauge shall have a minimum diameter of _____ |
3” |
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A gas line 4” NPS or larger that has been tested with air must be purged with_______ _______ or _______ and then purged with gas |
Carbon dioxide Nitrogen |
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How is an addition of less than 20ft tested ? |
Soap test |
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Plastic pipe may not be used for ______ _______ and its cannot be used for the first ___ ft from the outlet of a vaporizer |
Liquid propane
10ft |
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What light is used for testing ? |
Group 1 class D type |
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What light is used for testing ? |
Group 1 class D type |
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What height should the furnace be from the floor in a garage and repair garage? |
18” 54” |
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What light is used for testing ? |
Group 1 class D type |
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What height should the furnace be from the floor in a garage and repair garage? |
18” 54” |
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What materials are used for gas piping? |
Steel Copper Plastic (polyethylene) |
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What height should the furnace be from the floor in a garage and repair garage? |
18” 54” |
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What materials are used for gas piping? |
Steel Copper Plastic (polyethylene) |
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What is the maximum pressure for sch 40? |
125psi |
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What light is used for testing ? |
Group 1 class D type |
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What height should the furnace be from the floor in a garage and repair garage? |
18” 54” |
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What materials are used for gas piping? |
Steel Copper Plastic (polyethylene) |
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What is the maximum pressure for sch 40? |
125psi |
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Pipe Pressures over 125psi must be what size ? |
Sch 80 |
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What pipe is needed for liquid propane? |
Sch 80 |
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What pipe is needed for liquid propane? |
Sch 80 |
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Pipe smaller than 1/2” must be ______ |
Sch 80 |
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What pipe is needed for liquid propane? |
Sch 80 |
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Pipe smaller than 1/2” must be ______ |
Sch 80 |
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Additions added to existing gas line must be how far from the meter ? |
24” |
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Gaslines installed in concrete require what ? |
A sleeve with 1/2” gap |
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Gaslines installed in concrete require what ? |
A sleeve with 1/2” gap |
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Plastic gas line under ground must have what ? |
Tracer line |
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Gaslines installed in concrete require what ? |
A sleeve with 1/2” gap |
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Plastic gas line under ground must have what ? |
Tracer line |
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Vented appliance cannot be connected with what ? (Besides infrared heaters) |
With hose |
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Gaslines installed in concrete require what ? |
A sleeve with 1/2” gap |
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Plastic gas line under ground must have what ? |
Tracer line |
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Vented appliance cannot be connected with what ? (Besides infrared heaters) |
With hose |
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Hose and hose fittings max temp expose is what ? |
125F |
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Testing welded pipe what pressure is used ? |
50psi or 1.5 MOP for 180min |
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MI fittings max pressure is. |
125psig |
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