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IFGC 2021

Fuel Gas Code Practice — IFGC 2021 (planned)
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Planned general code practice. Not available for purchase or study access.

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Fuel Gas Code Practice — IFGC 2021 (planned)
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IFGC 2021
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KNOW THE TERRITORY

What you’ll practice.

Pipe sizing and testingPractice topic
Venting and combustion airPractice topic
Installation and safetyPractice topic

Topic organization for this practice bank, not a claim of exhaustive official exam coverage. EPA mocks use 25 questions per section; A+ mocks keep the two Cores separate.

TAKE IT FOR A TEST DRIVE

Three questions. No sign-up.

01 / Pipe sizing and testing

A natural-gas system uses the longest-length method. The most remote outlet is 85 feet from the delivery point, and another appliance is only 25 feet away. Which table-length row is used to size the shorter branch when the table lists 80 and 90 feet?

  1. The 20-foot row
  2. The 30-foot row
  3. The 80-foot row
  4. The 90-foot row
Show answer & explanation

The 90-foot row

The longest-length method uses the distance to the most remote outlet for each section, together with that section's own load. Select the next listed length that is not shorter than 85 feet: 90 feet.

IFGC 2021 402.4.1; Table 402.4(2)

02 / Pipe sizing and testing

A common gas-pipe segment supplies appliances rated 80,000, 40,000, and 30,000 Btu/h. No diversity reduction is approved. At a gas heating value of 1,000 Btu per cubic foot, what demand must that segment carry?

  1. 150 cubic feet per hour
  2. 150,000 cubic feet per hour
  3. 80 cubic feet per hour
  4. 110 cubic feet per hour
Show answer & explanation

150 cubic feet per hour

Add all connected inputs downstream of the segment: 150,000 Btu/h. Divide by the stated heating value of 1,000 Btu/ft³ to obtain 150 ft³/h; do not size the common segment for just the largest appliance.

IFGC 2021 402.2; 402.4.1

03 / Pipe sizing and testing

A Schedule 40 metallic natural-gas line has a 40-foot longest length, inlet pressure below 2 psi, 0.5-inch water-column design drop, and gas specific gravity 0.60. Table 402.4(2) lists 81 cfh for 1/2 inch, 170 cfh for 3/4 inch, and 320 cfh for 1 inch. What minimum listed size carries 150 cfh?

  1. 3/4 inch
  2. 1-1/4 inches
  3. 1 inch
  4. 1/2 inch
Show answer & explanation

3/4 inch

At the controlling 40-foot row, 1/2 inch carries only 81 cfh and is inadequate. The 3/4-inch capacity of 170 cfh covers 150 cfh, making it the smallest adequate listed size.

IFGC 2021 Table 402.4(2); 402.4.1