Oklahoma Plumbing Contractor and Natural Gas

Oklahoma Plumbing Contractor and Natural Gas

Key Concepts

Code applicability (IPC 2018, Page 1, Section 102.1). Where a general requirement conflicts with a specific requirement, the specific requirement governs. Where different sections specify different materials, methods of construction or other requirements, the most restrictive governs.

Exempt work (Pages 5–6, Section 106.2). No permit is needed for clearing stoppages or repairing leaks in pipes, valves or fixtures, and for removal and reinstallation of water closets — provided the repair does not involve replacement or rearrangement of valves, pipes or fixtures. Removing and replacing concealed defective pipe with new material is new work and requires a permit.

Oklahoma Plumbing Contractor and Natural Gas

Key Concepts

Gas piping materials and joints (2018 IFGC, Oklahoma) - Cast-iron pipe shall not be used in fuel gas piping (Section 403.4.1). Cast-iron flanges are permitted, but bushings shall not be used (403.10.5). - Copper tubing joints shall be assembled with approved gas tubing fittings, brazed with a material having a melting point in excess of 1,000°F (538°C), or assembled with press-connect fittings listed to ANSI LC-4/CSA 6.32. Brazing alloys shall not contain more than 0.05-percent phosphorus (403.10.2). The same 1,000°F/0.05-percent limits apply to brazed nonferrous Schedule 40 and heavier pipe (403.10.1). - Metallic pipe and fitting threads shall be taper pipe threads complying with ASME B1.20.1 (403.9).

Oklahoma Plumbing Contractor and Natural Gas | 8 questions, 9% of exam

Key Concepts

Minimum number of fixtures (Section 403.1, Table 403.1) - Fixtures are provided in the minimum number shown in Table 403.1, based on actual use of the building or space. Occupant load is determined by the International Building Code. - Nightclubs, bars, taverns, dance halls: water closets 1 per 40 male, 1 per 40 female; lavatories 1 per 75; drinking fountain 1 per 500; 1 service sink. - Business: water closets 1 per 25 for the first 50 and 1 per 50 for the remainder exceeding 50; lavatories 1 per 40 for the first 80 and 1 per 80 for the remainder exceeding 80. - Mercantile (retail stores, service stations, shops, salesrooms, markets, shopping centers): water closets 1 per 500; lavatories 1 per 750; drinking fountain…

Key Concepts

Pressure and design criteria - Where static water pressure in a building exceeds 80 psi, an approved pressure-reducing valve conforming to ASSE 1003 or CSA B356 with strainer must reduce pressure to not greater than 80 psi static (§604.8). - Where street main pressures fluctuate, design the distribution system for the minimum pressure available (§604.6). - Capacities at fixture supply pipe outlets must meet Table 604.3 under peak demand: water closet, siphonic flushometer valve 35 psi; blow-out flushometer valve 45 psi; urinal, valve 25 psi; drinking fountain 0.75 gpm at 8 psi; shower 2.5 gpm at 8 psi. - Fixture supply pipe must terminate not more than 30 inches from the point of connection to the fixture (§604.5). Minimum fixture supply for a flushometer-valve water closet is 1 inch (Table 604.5). - Maximum urinal consumption is **1.0…

Key Concepts

Pipe materials (Ch. 7, Tables 702.1, 702.2, 702.3; Ch. 11, Table 1102.4) - Table 702.1 governs above-ground drainage and vent pipe; Table 702.2 underground building drainage and vent; Table 702.3 building sewer. - Vitrified clay pipe (ASTM C4; ASTM C700) appears in Table 702.3 (building sewer) but not in Table 702.1 — cast iron, ABS and PVC appear in both. - Per Section 703.2, drainage pipe on filled or unstable ground must be ABS plastic, cast iron, copper or copper-alloy tubing, PVC plastic or polypropylene plastic as indicated in Table 702.3. Vitrified clay is not on this list. - Table 1102.4 lists polyethylene pipe to ASTM F667 for building storm sewer; Table 702.3 lists PE as SDR-PR, ASTM F714. - Section 702.5: where wastewater temperature exceeds 140°F (60°C), piping material must be rated for the highest wastewater…

Key Concepts

Trap seal protection and use limits. The vent system must permit admission or emission of air so that no fixture trap seal is subjected to a pressure differential of more than 1 inch of water column (249 Pa) — IPC 901.2. The vent system shall not be used for any purpose other than venting the plumbing system — IPC 901.4.

Vent terminals. Where a roof is used for assembly, or as a promenade, observation deck, sunbathing deck or similar purpose, open vent pipes terminate not less than 7 feet above the roof — IPC 903.1. A vent terminal shall not be located directly beneath any door, openable window or other air intake opening, and shall not be within 10 feet horizontally of such an opening unless it is 3 feet or more above the top of the…

Key Concepts

Fixture traps and dimensions (Section 1002.1) - Each plumbing fixture shall be separately trapped by a liquid-seal trap. A fixture shall not be double trapped. - Vertical distance from fixture outlet to trap weir: not more than 24 inches (610 mm). Horizontal distance: not more than 30 inches (762 mm), measured centerline of fixture outlet to centerline of trap inlet. - Exceptions: fixtures with integral traps; a combination plumbing fixture on one trap where one compartment is not more than 6 inches deeper than the other and waste outlets are not more than 30 inches apart; and (Exception 3) a grease interceptor serving as the trap for a single fixture or a combination sink of not more than three compartments, where the vertical distance from fixture outlet to interceptor inlet does not exceed 30 inches and the…

Key Concepts

• Offset terminology. When two pipes are parallel, the perpendicular distance between their centerlines is the offset; "set" is a shortened version of "offset." The offset is the c-c length if the parallel pipes are joined with 90° fittings (Review of Basic Fundamentals, Chapter 1, offset terminology section; Unit 17, Offset, Diagonal, Rise, and Run).
• Diagonal / travel. If two parallel pipes are connected by fittings other than 90°, the c-c length of the connecting pipe is the diagonal, often called travel. Diagonal construction is preferred to 90° fittings because there is less restriction to flow (Review of Basic Fundamentals, Chapter 1).
• Rise vs. run. Rise and run are the same distance; parallel vertical pipes give a rise, parallel horizontal pipes give a run (Unit 17).
• Why c-c cannot be cut directly. On threaded…

Key Concepts

Sizing fundamentals - Piping must meet the maximum demand and deliver gas to each appliance inlet at not less than the minimum supply pressure required by the appliance (Section 402.1). - Demand = sum of the maximum input of appliances served, using total connected hourly load unless a diversity of load is established; adjust for altitude above 2,000 feet (Section 402.2). - Longest length method: size every section using the longest length from the point of delivery to the most remote outlet and the load of that section (Section 402.4.1). - Branch length method: (1) size each section of the longest run using that longest run and the section load; (2) size each branch not previously sized using the length from the point of delivery to the most remote outlet in that branch and the section load…

Key Concepts

Fall protection duty and trigger height - Each employee on a walking/working surface with an unprotected side or edge 6 feet (1.8 m) or more above a lower level must be protected by guardrail systems, safety net systems, or personal fall arrest systems — §1926.501(b)(1). - On low-slope roofs 50 feet or less in width, a safety monitoring system alone (no warning line) is permitted for employees engaged in roofing activities with unprotected sides/edges 6 feet or more above lower levels — §1926.501(b)(10). - Definitions (§1926.500(b)): low-slope roof = slope less than or equal to 4 in 12; hole = gap 2 inches (5.1 cm) or more in least dimension; opening = gap 30 inches (76 cm) or more high and 18 inches (48 cm) or more wide.