New York City Gas Work Qualification Exam

Key Concepts

Test media (FGC 406.2). The test medium shall be air, nitrogen, carbon dioxide or an inert gas. Oxygen shall never be used. Fresh water is permitted only where the required test pressure exceeds 100 psig (689 kPa) — the same 100 psig limitation is repeated in Section 406.4, item 3.

Test pressures and durations (FGC 406.4). See the table below. In addition: - 406.4(1.5): Where required test pressure exceeds 125 psig, the test pressure shall not produce a hoop stress greater than 50 percent of the specified minimum yield strength of the pipe. - 406.4(3): Notwithstanding the other listed pressures, all factory applied coated and wrapped pipe shall be tested at a minimum of 90 psig (621 kPa gauge), with the pressure source isolated before readings are taken and timing measured after stabilization of the test medium. - 404.1, Item 5, Exception (3): Gas piping permitted in a residential public corridor must be welded and tested and proven tight at 10 psig for a minimum of 30 minutes.

NYC Gas Work Qualification Exam

Key Concepts

Identification & sizing (FGC Ch. 4) - All piping in new construction and all new piping in existing buildings must be identified by a yellow label marked "Gas" in black letters, per ASME A13.1, spaced at intervals not exceeding 5 feet (1524 mm). Not required on pipe in the same room as the appliance served; where a gas test is required, labeling must be done before the test (§401.5). - Individual outlets to gas ranges shall be not less than 3/4 inch (19 mm) NPS (§402.3, Item 4). - Distribution pressure inside buildings is generally limited to 1/2 psig; up to 5 psig is permitted for commercial/industrial occupancies where appliance fuel requirements exceed 4,000 cfh through separate gas distribution piping (§402.6, Exception 1; the 100,000 cfh figure belongs to Exception 2, 15 psig). - Piping over 5 psig inside buildings: 2 1/2 inches and greater must be butt-welded; less than 2 1/2 inches may be socket- or butt-welded. Radiographic testing required on such butt welds (§406.1.1.2). - Threaded fittings larger than 4 inches (102 mm) shall not be used; bushings prohibited (§403.10.4). - Branch take-off from a riser: not less than a two-elbow swing (§404.5). - MP regulator: capped/plugged tee for a pressure-measuring instrument not less than 10 pipe diameters downstream of the outlet (§410.2, item 6). - Underground piping: minimum 24 inches below grade…

Key Concepts

Scope and code hierarchy - Piping system rules cover natural gas; high pressure natural gas installations at 15 psig (103 kPa gauge) or above shall also comply with Appendix G (FGC 101.2.2). Coverage extends to the outlet of the appliance shutoff valves. - Where different sections specify different materials/methods, the most restrictive governs; a specific requirement governs over a general one; where British and metric units conflict, the British units govern (ADC §28-102.1; see also FGC 102.1).

Construction documents - Fuel-gas piping plans must include riser diagrams, diagrammatic floor plans (size, location, material), appliance/vent/chimney layouts with meter and shutoff valve locations including the outside gas cut-off of Appendix E §E6, detector/alarm locations, seismic protection and restraint details, breeching details, chimney details, structural supports, and flood-hazard compliance (FGC 106.5). - Heating systems: temperature to be maintained in every room plus output capacity in BTU/h of the central heating source (FGC 106.6). Boilers: output capacity in BTU/h, operating weight of each boiler, and the pressure setting of the relief valves (FGC 106.7). - Terms such as "code compliant," "approved," "legal" or similar shall not be used as a substitute for a specific code section, approval or standard (ADC §28-104.7.5). - The applicant must generally be the registered design professional, except for limited oil burner/boiler, limited plumbing, limited sprinkler and limited standpipe alterations, where the applicant is licensed to perform the work (ADC…

NYC Fuel Gas Code 2014 (Ch. 3 & 4) and NYC Plumbing Code 2014 (Ch. 3)

Key Concepts

Identification and general piping rules (FGC Ch. 4) - All new piping must be identified by a yellow label marked "Gas" in black letters, per ASME A13.1, spaced at intervals not exceeding 5 feet; not required on pipe in the same room as the appliance served; labeling completed prior to any required gas test (FGC 401.5). - Individual outlets to gas ranges: not less than ¾ inch NPS (FGC 402.3, Item 4). - Pressure above the normal ½ psig limit: 5 psig permitted in commercial/industrial occupancies where appliance fuel requirements exceed 4,000 cubic feet per hour supplied through separate gas distribution piping; 15 psig where loads exceed 100,000 cfh (FGC 402.6, Exceptions 1 and 2). - Threaded piping permitted up to 4 inches at pressure no greater than ½ psig (FGC 403.1.1, Item 6). Piping over ½ psig through 5 psig that is 4 inches or larger shall be welded (403.1.1(2), exception for listed gas trains supplied with the appliance); above 5 psig, welded regardless of size. Threaded fittings larger than 4 inches are prohibited (403.10.4). - Welded piping over 5 psig inside buildings: 2½ inches or greater must be butt-welded; less than 2½ inches may be socket- or butt-welded; radiographic testing of all butt welds (FGC 406.1.1.2). Welder qualification reports kept six years…

NYC Gas Work Qualification Exam · 4 questions (8%)

Key Concepts

Piping identification (FGC 401.5). All piping in new construction and all new piping in existing buildings — whether or not it will be enclosed — must be identified by a yellow label marked "Gas" in black letters, provided in accordance with ASME A13.1. Markings must be spaced at intervals not exceeding 5 feet (1524 mm). Marking is not required on pipe located in the same room as the appliance served. Where the installation requires a gas test, labeling must be completed prior to that test.

Welded vs. threaded distribution piping (FGC 403.1.1). Piping operating over 1/2 psig through 5 psig and 4 inches nominal or larger must be welded (item 2); manufactured and listed gas trains supplied with the appliance may be threaded. Item 6 permits threaded piping up to 4 inches only at pressures no greater than 1/2 psig.

Pressure testing by distribution pressure range (FGC 406.4, item 1). Up to 1/2 psig → 3 psig for 30 minutes (1.1). Over 1/2 psig through 5 psig → 50 psig for a minimum of 30 minutes (1.2). Over 5 psig through 15 psig → 100 psig for 1 hour (1.3).

Key Concepts

Scope and administration (Ch. 1) - The code covers natural gas piping systems; high-pressure installations at 15 psig (103 kPa gauge) or above shall also comply with Appendix G, and coverage extends to the outlet of the appliance shutoff valves (FGC 101.2.2). - Piping systems for mixtures of gas and air within the flammable range with an operating pressure greater than 10 psig are outside the scope of the code (FGC 101.2.4, Item 16). - Prior code buildings: Section 306.6 (guards) and Section 306.5 (permanent means of access) do not apply where equipment replaces existing equipment in the same location (FGC 102.4.2.2). Wind resistance still applies (FGC 102.4.2.4). Replacement of existing fuel gas piping in the same locations is not subject to Section 404.1, Item 5, when approved by the commissioner (FGC 102.4.2.1). - Construction documents: heating systems — temperature to be maintained in every room plus output capacity in BTU/h of the central heating source (FGC 106.6); boilers — output capacity in BTU/h, operating weight of each boiler, and pressure setting of the relief valves (FGC 106.7). - Underground progress inspection is made after trenches are excavated and bedded and piping installed, before backfill; where excavated soil contains rocks, broken concrete, frozen chunks or other rubble, clean backfill shall be on the job site (FGC 107.2, Item 1.1).