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62 Cards in this Set
- Front
- Back
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Threaded sched 40 pipe is rated for a max psi of? |
125 psi |
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Class 150 and class 300 malleable fittings have ratings of? |
125 psi-class 150 300 psi-class 300 (MI) |
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Gas piping or tubing can be made from? (3) |
Steel Copper Plastic- PE |
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Copper can be joined using? (3) |
Flared Brazed (alloy with melting point >1000F) Compression (double ferrule) |
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Plastic pipe can be joined by? (2) |
Thermal fusion Compression |
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Plastic pipe used for gas can only be used? (2) |
Outside and underground |
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What is required when using PE to aid in locating the pipe? |
Tracer wire |
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When is PE not allowed? (3) |
Liquid propane Within first 10ft downstream of a propane vaporizer Ambient temp 122F or operating temp 86F |
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Hose is rated for ? Psi |
350 psi |
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Max length of hose on a permanent installation? |
10 ft |
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Length of hose allowed for a construction heater? |
15-75 ft |
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Max length of hose on a portable appliance? |
30 ft |
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Length of hose allowed for a radiant tube heater? |
36” plus/minus 6” |
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Max temp hose can be subjected to? |
125F |
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Hanger spacing for 1/2” or less pipe |
6ft |
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Hanger spacing for piping 3/4”-1” |
8ft |
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Hanger spacing for piping 1-1/4” to 2-1/2” |
10ft |
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Hanger spacing for tubing |
6ft |
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Steel pipe joints can be made of? (4) |
Compression (dresser fitting) Threaded Flanged (neoprene gasket not natural rubber) Welded (must be welded if over 2”) |
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Aluminum bushings are called _______ bushings. They may change ____ pipe size and are provided with the ____ ____ |
Face bushings One pipe size Gas valve |
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Steel bushings may reduce ____. Malleable bushings may reduce _____. |
Steel- 1 or more pipe sizes Malleable- 2 or more sizes |
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Max length of a flex connector on a vented appliance? |
2ft |
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Max length of a flex connector on an unvented appliance? |
6 ft |
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Depth of a dirt pocket is determined by? |
Min 3” or diameter of piping it serves, whichever is larger |
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Diameter of a dirt pocket is determined by? |
Diameter of piping served but max 2” |
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Bury depth for a gas line? Bury depth under a commercial driveway? |
15” 24” |
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Approved methods for joining pipe underground (4) |
Welding Compression Flared Heat fusion |
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On commercial applications there must be yellow band markings and type of gas labeled every ____ft |
20 ft |
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Copper tubing in a residential application must be identified every ___ft |
Yellow bands every 6ft |
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Supply pressure of natural gas |
7-14” |
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Supply pressure of propane |
11” |
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Extensions to gas lines must be made within the first ___ft |
2ft |
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Pressure test for low pressure gas lines 200ft or less |
15 psi for 15 min |
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Pressure test for low pressure gas lines over 200 ft? |
15 psi for 60 min |
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Pressure test for welded pipe? |
50 psi or 1.5x the max operating pressure for 180 min |
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Pressure gauge is required to have a ___” Diameter face..be calibrated in increments of ___psi..and the max range shall excess test pressures by at least ___% but not more then ___% |
3” diameter 2 psi increments 15-300% |
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The purge point shall be at least ___ft from a building or air intake |
10feet |
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What is the min height of an air supply inlet above grade? |
12” |
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What is the minimum size of an opening used for fresh air supply? |
4” |
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What is the max developed length of an air supply duct allowed without increasing the size? |
20ft |
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Below grade side wall venting can be achieved using? |
Snorkel type fitting |
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A room heater in a bathroom must be _____ vent |
Direct vent |
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Vent terminals may not be less then __ft above a paved sidewalk or driveway on public property |
7ft |
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A vent may not terminate within __ft of a mechanical air supply inlet |
6ft |
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Hanger spacing for a plastic vent |
4ft |
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Max gas pressure allowed in a single family home? |
2 psi |
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All system regulators with inlet pressures above 1/2 psi shall be of the _____ shut off type |
Positive shut off |
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Piping less then 1” must be supported every ___ft on a roof |
4ft |
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Max length connectors for decorative and suspended appliances? |
2 ft |
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When combustion air comes from the building how do you size the opening and where is it located? |
1inch squared/1000 BTU Located within 6-18” from floor |
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If air is obtained from inside the building and there is a draft hood appliance how do you size the second opening and where is it located? |
Same size as air supply opening, located higher then the relief opening of the lowest draft control device |
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Min size of a vent |
9”squared, min dimension 2” |
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Min size air supply |
9”squared, min dimension 3” |
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Min size chimney |
12”squared, 4” round |
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Min gauge for draft hood appliances |
28 gauge |
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Min gauge for incinerator |
20 gauge |
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Tables reduced ___% for common manifold |
10% |
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Tables reduced ___% for an offset |
20% |
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Tables reduced ___% for high altitude |
10% |
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Tables reduced ___% for an extra 90 on a draft hood and ___% for an extra 90 on a fan assist |
10% draft hood 15% fan assist |
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Tables decreased ___% for a corrugated chimney liner |
20% |
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Max length of an offset? |
18”/ “diameter |
