Fuel Gas Code Flashcards

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1
Q

Sediment Traps are required in gas piping systems and must be located ______

A

After the appliance shutoff valve and as close as possible to the inlet of the equipment.
Pg. 76 Fuel Gas Code

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2
Q

You have a 45,000 btu/hr hot water heater and a 60,000 btu/hr furnace installed inside a building. How many cubic feet of combustion air is required for these two appliances when using indoor air for combustion?

A

5,250cu.ft.
Pg. 17 Fuel Gas Code

50cu.ft. per 1000btu
50 x 45= 2250cu.ft.
50 x 60= 3000cu.ft.
2250 + 3000= 5250cu.ft.

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3
Q

What is the maximum distance between supports for 1/2in semi rigid copper tubing when used as a gas line?

A

4ft.

Pg. 81 Fuel Gas Code

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4
Q

You are running a gas vent from a space through a ventilated attic. The vent travels through the attic insulation. what is the clearance you are required to maintain with an insulation shield if the vent is connected to a Category 1 furnace and the vent is type B double-wall?

A

1in

Pg. 84 Fuel Gas Code

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5
Q

A room inside a building has 100,000 btu/hr furnace and two 45,000 btu/hr water heaters installed that are taking combustion air from the space. How many cubic feet of air is needed for combustion air based on the standard method?

A

9500cu.ft.
Pg. 17 Fuel Gas Code

50cu.ft. per 1000btu
50 x 190= 9500

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6
Q

A corrugated stainless-steel tubing gas network has a longest length of 90ft. How many cubic feet of natural gas can a branch line that is 20ft long EHD18 carry if the meter is less than 2psi, the design pressure drop is .5inwc, and the specific gravity is .60?

A

58cu.ft.

Pg. 45 Fuel Gas Code

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7
Q

Your installation requires a clearance to combustible materials for a single-wall metal pipe vent connector of 12 inches along the side wall. You only have 6 inches. What is the least expensive form of protection code will accept to allow the installation to pass inspection with the 6in clearance?

A

1/2in insulation board over 1in glass fiber or mineral wool batts.
Pg. 24 Fuel Gas Code

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8
Q

When installing plastic gas piping outside and underground, the tracer wire shall terminate _____.

A

Above grade at each end.

Pg. 73 Fuel Gas Code

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9
Q

When installing sediment traps(drip legs) in gas piping, the length of the sediment trap shall be ______.

A

Any length.

Pg. 76-77 Fuel Gas Code

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10
Q

Can single wall metal tee and wye fittings be used to connect appliances to a common gas vent made from type B-vent?

A

No

Pg. 97 Fuel Gas Code

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11
Q

When 90 degree elbows are installed in gas vent installations, a reduction of _______% shall be applied to the vent table cavities in section 504.

A

10%

Pg. 97 Fuel Gas Code

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12
Q

A structure has an 80,000btu/h furnace and a 65,000btu/h water heater in a basement that measures 30ft x 50ft and has 8ft ceilings. How many cubic feet of combustion air is needed for these appliances?

A

7250cu.ft.

80,000btu/h + 65,000btu/h = 145,000btu/h
Standard method 50cu.ft per 1000btu/h
50 x 145 = 7250cu.ft.

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13
Q

Two appliances are connected to a single type-B vent system. One is an 80,000btu/h furnace with a 4in vent outlet and the other is a 45,000btu/h water heater with a 3in vent outlet. How does the code expect them to connect to the single vent pipe?

A

The smaller connector shall enter at the highest level consistent with the available headroom or clearance to combustible material.
Pg. 93 Fuel Gas Code

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14
Q

A 24inx 24in stamped metal grill is used for combustion air has how many square inches of free area when the manufacturers engineering data is not available?

A
432in²
When the manufacturers data is unknown:
Wood 25% free area
Metal 75% free area
A = 24 x 24
A = 576
FA = 576 x .75
FA = 432in²
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15
Q

The minimum number of thread per inch allowed on 1in Schedule 40 steel pipe is ________.

A

10

Pg. 70 Fuel Gas Code

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16
Q

You are sizing a corrugated stainless steel tubing gas pipe network that has a longest length of 83ft. The LP supplier has set a regulator at the house and it is delivering undiluted LP gas at 11inwc. The total connected load is 326,000btu/h, what size CSST pipe should you leave the regulator with if your design pressure drop is .5inwc and the specific gravity is 1.50?

A

EHD 39

Pg. 51 Fuel Gas Code

17
Q

The maximum length of a clothes dryer transition duct is limited to ________.

A

8ft

Pg. 124 Fuel Gas Code

18
Q

In general, floor furnaces shall have a minimum clearance from grade of not less than _______ inches.

A

6in

Pg. 122 Fuel Gas Code

19
Q

The appliance shut-off valve must be located no further from the appliance than_______.

A

6ft.

Pg. 77 Fuel Gas Code

20
Q

You are going to provide combustion air to a 90,000btu/h furnace with round horizontal ducts, what is the minimum size duct required?

A

8in
1in²/2000btu/h when communicating with the outdoors through horizontal ducts.
90,000btu ÷ 2000 = 45in²
Area = 45in²
Use the duct calculator to find an 8in duct has an area of 50in².
Pg. 18 Fuel Gas Code

21
Q

Brazing alloys shall not contain more than_____% phosphorous.

A

.05%

Pg. 70 Fuel Gas Code

22
Q

Boilers shall have all controls set, adjusted, and tested by _____________.

A

The boiler installer

Pg. 130 Fuel Gas Code