ICC G34 Journeyman Gas Pipe Fitter Exam (2018 IFGC)

ICC G34 Journeyman Gas Pipe Fitter Exam (2018 IFGC)

Key Concepts

Scope and administration - The code covers piping systems for natural gas with an operating pressure of 125 psig or less, and LP-gas at 20 psig or less (Section 101.2.2). - Installations in buildings moved into or within the jurisdiction shall comply with the provisions of the code for new installations (Section 102.7). - Commencing work before obtaining permits subjects the person to 100 percent of the usual permit fee in addition to the required permit fees (Section 106.6.1). - Underground inspection is made after trenches/ditches are excavated and bedded, piping is installed, and before backfill is put in place (Section 107.2, Item 1). - The permit holder furnishes apparatus, instruments, material and labor required for testing (Section 107.3.2). - An appeal application is filed on the code official's form within 20 days after the notice was served (Section 109.1).

Definitions (Section 202) - Bonding jumper: a conductor installed to electrically connect metallic gas piping to the grounding electrode system. - Pipe: rigid conduit of iron, steel, copper, copper-alloy or plastic. Tubing: semirigid conduit of copper, copper-alloy, aluminum, plastic or steel. - Piping system: fuel piping, valves and fittings from the outlet of the point of delivery to the outlets of the appliance shutoff valves. - Mechanical joint: press-connect, flanged, threaded, flared or compression joint. Flared joint: metal-to-metal compression joint with a conical spread on the tube end compressed by a flare nut against a mating flare. Flanged joint: made by bolting together a pair of flanged ends. Plastic heat fusion joint: made in thermoplastic piping by heating parts sufficiently to permit fusion when pressed together. - **Combustion…

Key Concepts

Decorative/fireplace appliances. Decorative appliances for installation in approved solid fuel-burning fireplaces are tested to ANSI Z21.60/CSA 6.26; manually lighted natural gas decorative appliances are tested to ANSI Z21.84 (Section 602.1). Except for those tested to ANSI Z21.84, such appliances must use a direct ignition device, an ignitor or a pilot flame and be equipped with a flame safeguard device that automatically shuts off fuel to the main burner or group of burners when the means of ignition becomes inoperative (Section 602.2). Vented gas fireplaces are tested to ANSI Z21.50/CSA 2.22 and equipped per 602.2 (Section 604.1); vented gas fireplace heaters are tested to ANSI Z21.88/CSA 2.33 and equipped per 602.2 (Section 605.1).

Vented wall furnaces. Tested to ANSI Z21.86/CSA 2.32 (Section 608.1). A door shall not swing within 12 inches (305 mm) of an air inlet or air outlet, measured at right angles to the opening; doorstops or door closers shall not be installed to obtain this clearance (Section 608.4).

Unit heaters. Tested to ANSI Z83.8/CSA 2.6 (Section 620.1). Suspended-type units must be supported by elements designed for the weight and dynamic loads, with hangers and brackets of noncombustible material (Section 620.2). Clearances to combustibles: suspended type — not less than 18 inches at the sides, 12 inches at the bottom, 6 inches above the top where the heater has an internal draft hood (1 inch above the top of the sloping side of a vertical draft hood); floor-mounted type — not less than 6 inches at the back and one side only (Section 620.4). Unit heaters in garages for more than three motor vehicles, or in aircraft hangars, follow Sections 305.9, 305.10 and 305.11 (Section 620.5).…

Key Concepts

Sizing basis and demand - Piping shall be sized to provide gas sufficient to meet the maximum demand and supply each appliance inlet at not less than the minimum supply pressure required by the appliance (Section 402.1). - The volumetric flow rate shall be the sum of the maximum input of the appliances served. The total connected hourly load is the basis for pipe sizing, assuming all appliances could operate at full capacity simultaneously; where a diversity of load can be established, sizing may be based on such loads (Section 402.2). - Flow rate shall be adjusted for altitude where the installation is above 2,000 feet (610 m) in elevation (Section 402.2). - Gas piping shall be sized by one of: (1) the tables or equations of Section 402.4 or 402.5, (2) sizing tables in a listed piping system manufacturer's installation instructions, or (3) other approved engineering methods (Section 402.3).

The three length methods - Longest length (402.4.1): pipe size of each section is determined using the longest length of piping from the point of delivery to the most remote outlet and the load of the section. - Branch length (402.4.2): the longest run is sized by its own length; each branch section is sized using the length from the point of delivery to the most remote outlet in that branch. - Hybrid pressure (402.4.3): higher-pressure sections use the longest length from the point of delivery to the most remote line pressure regulator; piping downstream of a regulator uses the length from that regulator to the most remote outlet it serves.

2018 IFGC, Chapter 3, Section 304

Key Concepts

Which method applies (304.1). Combustion, ventilation and dilution air shall be provided by one of the methods in Sections 304.5 through 304.9. Where the requirements of Section 304.5 are not met, outdoor air shall be introduced per 304.6 through 304.9. Direct-vent appliances, gas appliances of other than natural draft design, vented gas appliances not designated as Category I, and appliances equipped with power burners shall instead be provided air in accordance with the appliance manufacturer's instructions. Exception: Type 1 clothes dryers provided with makeup air per Section 614.6.

Supporting rules. Appliances shall be located so as not to interfere with proper circulation of combustion, ventilation and dilution air (304.2). A draft hood or barometric draft regulator shall be installed in the same room or enclosure as the appliance served (304.3). Where exhaust fans, clothes dryers and kitchen ventilation systems interfere with appliance operation, makeup air shall be provided (304.4).

Indoor combustion air (304.5). Required volume is determined by 304.5.1 or 304.5.2, except that where the air infiltration rate is known to be less than 0.40 ACH, Section 304.5.2 shall be used. The total required volume is the sum for all appliances in the space.

Combining indoor spaces (304.5.3). Same story (304.5.3.1): each opening ≥ 1 in² per 1,000 Btu/h of total input, but not less than 100 square inches; one opening commencing within 12 inches of the top and one within 12 inches of the bottom of the enclosure; minimum dimension not less than 3 inches. Different stories (304.5.3.2): permanent openings in doors or floors having a total minimum free area of 2 in² per 1,000 Btu/h of total input.

Key Concepts

Venting required / exemptions (Section 501.8). Every appliance must discharge products of combustion outdoors (501.2) except the eleven listed exemptions — ranges, hot plates and laundry stoves, Type 1 clothes dryers, refrigerators, counter appliances, room heaters listed for unvented use, direct-fired makeup air heaters (Item 9), and others. Where appliances in Items 5 through 11 are installed so the aggregate input rating exceeds 20 Btu/h per cubic foot of room volume, one or more must be vented so the remaining unvented appliances do not exceed 20 Btu/h/ft³.

Vent system selection (Table 503.4). Listed Category I appliances, listed draft-hood appliances, and appliances listed for Type B gas vent may use Type B gas vent, chimney, single-wall metal pipe, a listed chimney lining system, or special gas vent. Listed vented wall furnaces use Type B-W vent. Category II, III and IV: as specified by the manufacturer. Unlisted appliances: chimney.

Terminations. - Type B or L gas vent: not less than 5 feet vertical above the highest connected draft hood or flue collar; Type B-W: not less than 12 feet above the bottom of the wall furnace (503.6.6). - Chimneys for residential-type or low-heat appliances: not less than 3 feet above the highest point of roof passage and not less than 2 feet higher than any portion of a building within 10 feet horizontally (503.5.4). - Mechanical draft venting (excluding direct-vent): 4 feet below, 4 feet horizontally from, or 1 foot above any door, operable window or gravity air inlet; terminal bottom not less than 12 inches above finished ground level (503.8, Item 2). Also not less than 3 feet above any forced-air inlet within 10 feet (503.8, Item 1).…