Hoja de Referencia del Examen · Referencia Rápida
Oklahoma Plumbing Contractor and Natural Gas
Oklahoma · PSI Services Contractor
Verificado, no estimado. Cada cifra a continuación proviene de la estructura oficial del examen que mantenemos: número de preguntas, puntaje de aprobación y ponderación de temas. Las preguntas de práctica están fundamentadas en la ley fuente con citas de estatutos. Omitimos cualquier cifra que no podamos verificar en lugar de adivinarla.
Total de preguntas
85
Puntaje de aprobación
75%
Tiempo del examen
180 min
Administrado por
PSI Services Contractor
Formato
Se permiten materiales de referencia
Porción Estatal de Oklahoma 85 preguntas
Conocimientos y Regulaciones Generales de Plomería
10 Q · 12%
IPC Chapter 1 scope, intent, and applicability of the plumbing codePermit requirements, application procedures, and exempt workCode official duties, inspection authority, and enforcement powersRequired plumbing system tests and inspection typesPipe length calculations using fitting allowances for threaded, copper, and PVC fittingsOffset and diagonal calculations using angle constants (45°, 60°, other angles)Volume, pressure, and capacity calculations for water systemsPipe material types, weights, and schedules (standard, copper, plastic, cast iron)Head PressurePipe JointsSolvent Welded Pipe JointsCalculations of Area and Volume
+12 más
Tuberías, Válvulas y Válvulas de Control
8 Q · 9%
Pipe joints, fittings, and connection methods for gas and water pipingWater supply and distribution pipe materials, standards, and fittingsValves: types, required locations, and control valve functions (pressure-reducing, backflow preventers, relief valves)Pipe length calculations: fitting allowances, center-to-center and end-to-end measurementsPiping support, hangers, and spacing requirementsPVC Piping and ConnectionsCPVC Piping and ConnectionsGalvanized Piping and ConnectionsCopper Tubing and ConnectionsCopper Piping and ConnectionsPolyethylene Piping and ConnectionsPEX Piping and Connections
+5 más
Accesorios y Equipos
8 Q · 9%
Minimum number and type of plumbing fixtures by occupancy classificationFixture installation requirements (spacing, clearances, and setting)Individual fixture standards and waste outlet requirements (water closets, lavatories, showers, bathtubs, sinks, urinals)Flushing devices, shower valves, and temperature-limiting controls for fixturesWater heater installation, safety devices, and relief valve requirementsTrap requirements, prohibited trap types, and trap seal protectionInterceptors and separators (grease, oil, sand) installation and sizingGas appliance installation requirements (cooking appliances, water heaters, room heaters, clothes dryers)Identify Minimum Plumbing Needs for Structures/FacilitiesInstall Fixtures and Associated Equipment
Suministro de Agua
10 Q · 12%
Backflow prevention devices, assemblies, and application requirementsWater distribution system design criteria including flow rates, pressures, and pipe sizingApproved piping materials, fittings, and joining methods for water service and distributionPotable water protection including cross-connection control and identification of nonpotable systemsValve requirements including full-open valves, shutoff valves, and pressure-reducing valvesWater pressure booster systems, water hammer arrestors, and thermal expansion controlHot water supply system requirements including temperature limits and recirculation systemsNonpotable water systems including graywater reuse and rainwater collection storage and distributionWater Supply and Distribution LinesProtection of Potable Water SupplyBackflow
Desagües y Alcantarillado
10 Q · 12%
Sanitary drainage pipe materials and standards (above-ground, underground, and building sewer)Drainage system sizing using fixture unit values and pipe sizing tablesSlope, installation, and fittings for horizontal drainage pipingCleanout requirements (location, spacing, size, and access)Sumps, ejectors, and below-grade drainage systemsBackwater valves and sewage backflow protectionStorm drainage system design and sizing (roof drains, conductors, leaders, and gutters)Indirect waste piping, air gaps, air breaks, and waste receptorsDrain and Sewer PipeBuilding SewersSewer and Drain CleanoutsSewage Ejectors and Sump Pumps
+3 más
Ventilaciones
13 Q · 15%
Vent pipe sizing and developed length (IPC stack vents, vent stacks, individual/branch/circuit vents)Vent terminal location and termination requirements (roof extension height, clearances from openings, wall terminations)Venting methods and types (individual, common, wet, circuit, combination waste-and-vent, single-stack, island fixture)Air admittance valves (installation, location, size, prohibited installations, required outdoor vent)Vent connections and grades (dry vent rise, connection above drain centerline, grade back to drainage)Vent InstallationDeveloped Length
Trampas, Interceptores, Residuos Indirectos y Especiales
10 Q · 12%
Fixture trap requirements, dimensions, and prohibited trap typesTrap seal depth, protection methods, and primer devicesGrease interceptors and automatic grease removal devicesOil separators and sand interceptors for commercial applicationsIndirect waste piping requirements and air gap vs. air break distinctionsWaste receptors, standpipes, and hub drain installationSpecial waste neutralization for corrosive waste dischargeInterceptor and separator venting, access, and maintenance requirementsTrapsInterceptors and SeparatorsIndirect and Special Waste
Análisis Isométrico
7 Q · 8%
Calculating center-to-center (c-c) pipe lengths from isometric diagramsCalculating end-to-end (e-e) pipe lengths using fitting allowances45° offset constants (1.414 diagonal multiplier, 0.707 offset multiplier) applied to isometric layoutsThree-pipe offset diagrams with rise, run, and diagonal relationshipsFitting allowances for threaded, copper, PVC, and cast iron fittings in isometric assembliesSolving multi-fitting assemblies with wyes, tee-wyes, and elbows from isometric drawingsRolling offsets and true offset calculation using the Pythagorean theoremReading and interpreting offset terminology (offset, diagonal, rise, run, travel) from pipe diagramsIsometric Drawings
Gas Combustible
5 Q · 6%
Gas pipe sizing methods, tables, and equations (longest length, branch length, hybrid pressure)Approved piping materials and fittings (steel, copper, CSST, polyethylene, prohibited materials)Pressure requirements, allowable pressure drop, and maximum operating pressureVenting systems for fuel gas appliances (vent types, sizing, termination, connectors)Combustion air requirements for gas appliances (indoor, outdoor, mechanical methods)Appliance installation requirements (location, clearances, access, prohibited locations)Pipe testing, purging, identification, and leak checkingPipe length calculations and fitting allowances for fuel gas pipingGas Distribution Pipe SizingGas Pressure RegulatorsHangers and SupportsDirection Changes
+14 más
Seguridad
4 Q · 5%
Fall protection trigger heights and duty to provide fall protection (6-foot rule, specific work conditions)Personal fall arrest system components, specifications, and proper useGuardrail system requirements and specificationsLadder safety requirements, proper use, and inspectionPersonal protective equipment selection, provision, and maintenance (head, eye, face, foot, hearing protection)Safety net systems installation and inspection requirementsStairway construction requirements and stairrail/handrail specificationsFall protection training, certification, and retraining requirementsResponsibility for Providing Personal Protective EquipmentExcavation SafetyEmployee Protection in Trenches and ExcavationsSafety Training Requirements
+13 más
Distinciones Clave
Air Gap (indirect waste)vsAir Break (indirect waste)
An air gap is measured between the indirect waste pipe and the flood level rim of the waste receptor, while an air break is provided between the indirect waste pipe and the trap seal of the waste receptor.
Chapter 8 Indirect Special Waste, Section 802.1.1Longest Length Method (fuel gas sizing)vsBranch Length Method (fuel gas sizing)
The longest length method uses the single overall longest run for sizing all sections, whereas the branch length method sizes each branch using the length from the point of delivery to the most remote outlet in that specific branch plus that branch's load.
2018 International Fuel Gas Code (Oklahoma), Section 402.4.2No-Hub Cast Iron Fitting AllowancevsThreaded Pipe Fitting Allowance
No-Hub cast iron deducts only the D dimension with no thread-in deduction because pipe connects via a stainless steel shield and clamp, while threaded pipe requires subtracting the thread-in measurement from the center-to-face dimension for each fitting.
Mathematics for Plumbers and Pipefitters, Pages 107-108 (Unit 28, Cast Iron Assemblies with Various Bends, Sample Problem 1)PVC Solvent Cement JointvsCPVC Solvent Cement Joint
PVC water supply joints require a purple primer conforming to ASTM F656 followed by a non-purple solvent cement per ASTM D2564, while CPVC joints use an orange solvent cement conforming to ASTM F493.
International Plumbing Code 2018, Section 605.21.3, Page 69Lead PEL (50 µg/m³)vsLead Action Level (30 µg/m³)
The permissible exposure limit for lead is 50 µg/m³ as an 8-hour TWA and is the hard legal limit, while the action level of 30 µg/m³ is a lower threshold that triggers ancillary requirements such as exposure monitoring, medical surveillance, and training.
29 CFR §1926.62(c)(1)Prime Contractor OSHA ResponsibilityvsSubcontractor OSHA Responsibility
The prime contractor retains overall responsibility for OSHA compliance for all work under the contract and is never relieved of it, while both prime and subcontractor share joint responsibility for the subcontracted work.
29 CFR §1926.16 (preamble) and §1926.16(c)-(d)General Requirement (IPC conflict rule)vsSpecific Requirement (IPC conflict rule)
When a general requirement and a specific requirement conflict in the IPC, the specific requirement governs; when different sections specify different materials or methods, the most restrictive governs.
International Plumbing Code 2018, Page 1 (Section 102.1)Written Emergency Action PlanvsOral Emergency Action Plan
Employers with more than 10 employees must maintain a written emergency action plan with all required elements, while employers with 10 or fewer employees may communicate the plan orally and need not maintain a written document.
29 CFR §1926.35(e)(3)45° Offset Constant (diagonal from offset)vs45° Offset Constant (offset from diagonal)
To find the diagonal from the offset in a 45° offset, multiply the offset by 1.414; to find the offset from the diagonal, multiply by 0.707.
Mathematics for Plumbers and Pipefitters, Pages 67-68CPVC PipevsPVC Pipe
CPVC is designed for temperatures of 120°F and higher with an upper working temperature of 215°F, while standard PVC loses strength significantly as temperature increases and is not suitable above 120°F.
Mathematics for Plumbers and Pipefitters, Pages 46-47Food-Handling Equipment DrainagevsCommercial Dishwasher / Utensil Sink Drainage
Equipment used for food storage, preparation, and handling must discharge through an indirect waste pipe by means of an air gap specifically, while commercial dishwashing machines, food utensil sinks, and nonpotable clear-water waste may use either an air gap or an air break.
Chapter 8 Indirect Special Waste, Section 802.1.1Schedule #40 PVC (160 psi)vsSchedule #80 PVC (200 psi) / Schedule #120 PVC (315 psi)
Schedule #40 PVC is rated to 160 psi at 73.4°F, Schedule #80 to 200 psi, and Schedule #120 (double extra-heavy) to 315 psi, with heavier schedules providing higher pressure ratings.
Mathematics for Plumbers and Pipefitters, Page 47Términos Clave
Permit Expiration (IPC Section 106.5.3) International Plumbing Code 2018, Page 6 (Section 106.5.3)
A plumbing permit expires and becomes null and void if authorized work is not commenced within 180 days from the date the permit was issued.
Unpermitted Work Fee Penalty (IPC Section 106.6.1) International Plumbing Code 2018, Page 7 (Section 106.6.1)
Any person who begins plumbing work before obtaining a required permit is subject to an additional 100 percent of the usual permit fee on top of the required permit fee.
Permit-Exempt Plumbing Work (IPC Section 106.2) International Plumbing Code 2018, Pages 5-6 (Section 106.2)
Clearing stoppages or repairing leaks in pipes, valves, or fixtures is exempt from permit requirements, provided the work does not involve replacement or rearrangement of valves, pipes, or fixtures.
IPC Purpose (Section 101.3) International Plumbing Code 2018, Page 1 (Section 101.3)
The International Plumbing Code exists to establish minimum standards providing a reasonable level of safety, health, property protection, and public welfare through regulation of plumbing design, installation, and materials.
Multi-Occupancy Fixture Count Rounding (IPC Section 403.1.1) IPC 2018, Section 403.1.1
For buildings with multiple occupancies, fractional fixture numbers for each occupancy must be summed first across all occupancies and then rounded up to the next whole number, rather than rounding each occupancy individually.
PVC Water Supply Joint — Purple Primer Requirement (IPC Section 605.21.3) International Plumbing Code 2018, Section 605.21.3, Page 69
For PVC plastic water supply pipe joined with solvent cement, a purple primer conforming to ASTM F656 must be applied to joint surfaces before applying solvent cement conforming to ASTM D2564 or CSA B137.3.
Lead Permissible Exposure Limit (PEL) 29 CFR §1926.62(c)(1)
The OSHA construction PEL for inorganic lead is 50 micrograms per cubic meter of air (50 µg/m³) averaged over an 8-hour time-weighted average period.
Lead Action Level 29 CFR §1926.62(b); Appendix A to §1926.62
An airborne lead concentration of 30 µg/m³ as an 8-hour TWA triggers ancillary requirements including exposure monitoring, medical surveillance, and employee training.
Carbon Monoxide PEL 29 CFR §1926.55, Table 1 (Carbon monoxide)
The OSHA construction permissible exposure limit for carbon monoxide is 50 ppm (55 mg/m³) as an 8-hour time-weighted average.
True Offset (Rolling Offset) Mathematics for Plumbers and Pipefitters, Page 146
The true offset of a rolling offset combines horizontal and vertical components using the formula: true offset = √(offset² + rise²), and this result is then used with the fitting angle constant to find the diagonal pipe length.
Type DWV Copper Tubing Mathematics for Plumbers and Pipefitters, Page 42
Copper tubing Type DWV is specifically manufactured for drainage, waste, and vent service, distinguished from Types K, L (pressure service), and M (interior service).
Permissible Noise Exposure (8-Hour) 29 CFR §1926.52(a)-(b), Table D-2
The OSHA construction permissible noise exposure limit for an 8-hour workday is 90 dBA, and when this level is exceeded, feasible engineering or administrative controls must be implemented before relying on PPE.
Fórmulas que Debes Saber
End-to-End Length (Threaded Pipe)
e-e = center-to-center − total fitting allowance; fitting allowance per fitting = center-to-face (A) − thread-in (B)End-to-End Length (No-Hub Cast Iron)
e-e = center-to-center − sum of D dimensions (no thread-in deduction)End-to-End Length (Copper / PVC Fittings)
e-e = center-to-center − sum of fitting allowances; fitting allowance = center-to-face − depth of cup45° Offset — Diagonal from Offset
diagonal = offset × 1.41445° Offset — Offset from Diagonal
offset = diagonal × 0.70760° Offset — Diagonal from Offset
diagonal = offset × 1.1547 (cosecant of 60°); run = offset × 0.5774 (cotangent of 60°)Rolling Offset — True Offset
true offset = √(horizontal offset² + vertical rise²)Parallel 45° Offset — Difference in Pipe Length
length difference = spread × 0.414Lead Quantity for Cast Iron Hub Joints
lead (oz) = pipe diameter (inches) × 12 oz × number of joints; pounds = total oz ÷ 16