CSLB C-36 Plumbing Contractor flashcards

OSHA mandates a maximum allowable slope of 1.5 horizontal to 1 vertical (34 degrees) for Type C soil in trenches 5 feet or deeper, if shoring or shielding is not used.

• Type C soil is cohesive soil with an unconfined compressive strength of 0.5 tsf or less, or granular soils.
• Sloping is one method of protecting workers from trench collapse.
• Alternative methods include shoring, shielding, or benching.

Memory trick: C for 'Crumbling' soil needs a 'Cushy' slope: 1.5 horizontal for every 1 vertical.

The necessary measures to prevent contaminated water from a bidet or toilet bowl from siphoning or flowing back into the potable water supply.

• Bidet attachments are considered a high-hazard cross-connection.
• Requires the highest level of backflow protection.
• Air gap is the most reliable method, often integral to compliant bidet designs.

Memory trick: Bidet bowl, water's call, air gap stands above it all.

Plumbing permits ensure that installations meet local safety and building codes, protecting public health and safety.

• Required for most significant plumbing alterations or new installations.
• Triggers inspections by local code officials.
• Protects against faulty work, property damage, and health hazards.

Memory trick: Permits are like a safety check, ensuring everything is up to code for everyone's protection.

Regulations and certifications (like EPA WaterSense) that define the maximum flow rate for showerheads to promote water conservation.

• Federal standard was 2.5 GPM, but many states and programs have adopted stricter limits.
• EPA WaterSense certified showerheads are typically 2.0 GPM or less.
• California's standard for new showerheads is 1.8 GPM.
• Aims to reduce water consumption without sacrificing performance.

Memory trick: Two gallons or less, for water success.

When low hot water pressure is observed at only one specific fixture, but not elsewhere in the plumbing system, it typically indicates a localized obstruction or malfunction within that fixture's hot water supply line or internal components.

• Problem is fixture-specific.
• Often due to sediment or faulty cartridge.
• Requires investigation at the point of use.

Memory trick: Isolated low flow? Check where the water doesn't go!

Benefits of using Cross-linked Polyethylene (PEX) tubing for plumbing applications, particularly in water distribution systems.

• Flexible, reducing fittings and installation time.
• Corrosion-resistant and less prone to bursting from freezing.
• Quieter than metal pipes, reducing water hammer noise.

Memory trick: PEX is flexible, less fittings, less fuss.

The maximum number of drainage fixture units (DFU) that a building sewer of a specific diameter and slope can accommodate according to the Uniform Plumbing Code (UPC).

• DFU values are assigned to plumbing fixtures based on their probable discharge into the drainage system.
• Building sewer capacity is determined by pipe diameter and slope.
• UPC Table 703.2 (or similar) provides these capacity limits.
• Proper sizing ensures adequate flow and prevents overloading and blockages.

Memory trick: Diameter and slope dictate the flow's fate.

PVC pipe schedules (e.g., 40, 20) denote wall thickness, with higher numbers indicating thicker walls and greater strength.

• Schedule 40 is standard for pressure and drainage applications requiring higher strength.
• Schedule 20 (thin-wall) is used for non-pressure, non-critical drainage or vent applications.
• Wall thickness directly impacts pipe's pressure rating and durability.

Memory trick: Thicker walls mean tougher pipes, just like a strong fort.

To be WaterSense compliant, toilets must have a maximum average flush volume of 1.28 gallons per flush (GPF), calculated based on a weighted average of full and reduced flush cycles for dual-flush models.

• Maximum 1.28 GPF average.
• Includes dual-flush calculations.
• Saves significant water compared to 1.6 GPF.

Memory trick: WaterSense toilets flush with less, 1.28 is the best!

Hard water contains high levels of dissolved minerals (like calcium and magnesium). When heated, these minerals precipitate to form scale, which can significantly reduce the efficiency of heat exchangers in hot water systems like heat pumps and lead to component damage.

• Scale reduces heat transfer.
• Increases energy consumption.
• Can clog pipes and damage components.

Memory trick: Hard water means hard times for your heat pump's prime.

The process of securing a water heater to a building's structural elements using approved straps to prevent damage or injury during an earthquake.

• Required in seismically active areas.
• Typically involves two straps: one in the upper third and one in the lower third.
• Straps must be anchored to structural framing.

Memory trick: Secure the tank, save the day, when the earth starts to sway.

A tank designed to pre-heat incoming cold water, typically using a secondary heat source such as drain water heat recovery or flue gas heat, before it enters the main water heater, thereby increasing energy efficiency.

• Improves energy efficiency of the hot water system.
• Reduces the load on the primary water heater.
• Often used in commercial or high-demand residential applications.

Memory trick: Tempering tank: 'T' for 'Take' waste heat, 'T' for 'Turn' cold water warm.

The process of determining the appropriate diameter of gas piping based on factors like BTU demand, pipe length, available pressure, and specific gravity of the gas.

• Calculated using sizing tables (e.g., UPC, NFPA 54).
• Factors include total BTU/hr, pipe length, and pressure drop allowance.
• Undersized pipes lead to insufficient appliance operation and potential safety issues.

Memory trick: BTU, length, pressure: the gas pipe size creators.

A type of toilet fill valve that uses a flexible diaphragm to control water flow, offering excellent sealing and durability, especially in high-pressure systems.

• More durable and less prone to leaks than plunger-type valves.
• Often quieter in operation.
• Suitable for high water pressure environments.

Memory trick: For high pressure, 'Diaphragm' valves 'Deliver Durability'.

Methods used in plumbing systems to prevent the loss of a trap's water seal due to negative pressure (siphonage), which would allow sewer gases to enter the building.

• Trap seals prevent sewer gases from entering occupied spaces.
• Siphonage is caused by negative pressure (vacuum) in the drain.
• Proper venting is the primary method to prevent siphonage.

Memory trick: Vent pipe is the trap's air-breather.

An auxiliary electric or gas heater used with commercial dishwashers to raise the incoming hot water temperature to the high levels required for sanitization.

• Typically heats water to 180°F (82°C) for final rinse.
• Essential for meeting health code sanitization standards.
• Installed in-line with the dishwasher's hot water supply.

Memory trick: To sanitize the stack, a booster heater puts the heat on track.

Minimum burial depth required for water service pipes to protect them from external forces and freezing according to the Uniform Plumbing Code.

• Depth varies based on location (e.g., under buildings, undisturbed ground, vehicular traffic).
• Protects against physical damage and frost.
• Specific requirements are detailed in UPC Section 609.1.1.

Memory trick: Vehicles need two feet of cover.

The minimum vertical distance required between the top of an underground pipe and the finished grade level.

• Protects pipes from external loads (vehicular traffic, heavy equipment, soil weight).
• Shields pipes from physical damage (impacts, digging).
• Can provide some freeze protection, though this is secondary for storm drains.
• Requirements vary based on pipe material, location (under traffic vs. landscape), and local codes.

Memory trick: Cover depth protects pipes from crush and crunch.

The maximum number of drainage fixture units (DFUs) that a building sewer of a specific size can accommodate, as defined by plumbing codes like the UPC, to ensure proper wastewater flow.

• DFU values are assigned to plumbing fixtures based on their discharge rate.
• Building sewer size directly correlates with its DFU capacity.
• Exceeding capacity can cause drainage issues and code violations.

Memory trick: Don't overload your pipes, know the DFU max to keep the flow right.

A dishwasher air gap is a backflow prevention device installed on the countertop, creating a physical air break between the dishwasher's drain hose and the dwelling's drain system, preventing dirty drain water from siphoning back into the potable water supply.

• Prevents back-siphonage.
• Protects potable water.
• Required by many plumbing codes.

Memory trick: Air gap's high, keeps dirty water from getting nigh.

Water pressure at a fixture is calculated by subtracting all pressure losses (static head, friction) from the initial supply pressure.

• Static head loss occurs due to elevation changes (1 psi per 2.31 feet of elevation gain).
• Friction loss occurs as water flows through pipes, fittings, and valves.
• Total pressure at fixture = Supply pressure - Static head loss - Friction loss.

Memory trick: Starting pressure minus the 'downs' of elevation and pipe rub equals final pressure.

A gate valve is a full-port, multi-turn valve primarily used for complete shut-off or full-open service, offering minimal flow restriction.

• Ideal for main shut-off applications (water, gas).
• Not designed for throttling or flow regulation.
• Provides a tight seal when fully closed.

Memory trick: For main shut-off, you need a 'gate' that opens wide and closes tight.

The material used for pipes that carry away condensate from HVAC equipment, dehumidifiers, or high-efficiency furnaces.

• Condensate is often slightly acidic, requiring corrosion-resistant materials.
• PVC is the most common and cost-effective choice due to its chemical resistance and ease of installation.
• CPVC can be used for higher temperature condensate applications.
• Copper, galvanized steel, and cast iron are generally unsuitable due to corrosion.

Memory trick: Acidic drip, PVC grip, no metal slip.

A safety feature on garbage disposals that trips to shut down the motor when it overheats or is overloaded, preventing damage.

• Located on the bottom of the disposal unit.
• Must be pressed to restore power after tripping.
• Often trips due to jams or continuous heavy use.

Memory trick: Humming and hot means 'Help Out' by pressing the reset.

Personal Protective Equipment (PPE) designed to reduce noise exposure to safe levels, preventing noise-induced hearing loss.

• Required for noise levels exceeding 85 dBA (8-hour TWA).
• Includes earplugs, earmuffs, or canal caps.
• Crucial for loud machinery operation.

Memory trick: Match the PPE to the hazard, protect yourself from harm's regard.

A severe injury caused by high-pressure hydraulic fluid penetrating the skin, often through a pinhole leak, leading to tissue damage, infection, and potential amputation.

• Fluid can penetrate skin at high pressure without visible trauma.
• Requires immediate medical attention by specialists.
• Often underestimated due to minimal initial pain.

Memory trick: Don't let the hydraulic leak deceive, a small stream can cause grave grief.

The legally compliant process of collecting, storing, transporting, and treating or disposing of waste materials that pose a threat to human health or the environment.

• Requires proper identification and labeling.
• Must be handled by licensed professionals.
• Strict regulations govern all stages of disposal.

Memory trick: For hazardous waste, 'L'abel, 'C'ollect, and 'H'ire a pro to haul it away.

Practices and conditions that ensure a safe environment for workers, preventing accidents and injuries related to tools and equipment.

• Keep work area clean and free of clutter.
• Ensure tools are in good working order.
• Properly store tools and materials.

Memory trick: A safe tool, a tidy space, keeps accidents out of place.

A hazardous condition in a confined space where the oxygen concentration falls below a safe level (typically 19.5%), often due to combustion, displacement by other gases, or biological processes.

• Can cause rapid asphyxiation.
• Common in confined spaces with combustion sources.
• Requires atmospheric testing and ventilation.

Memory trick: In a box, with a flame, oxygen goes down, that's the dangerous game.

Strategies and actions taken to minimize the risk of fire during plumbing work, especially when working with or near flammable materials.

• Eliminating fuel sources is key.
• Controlling ignition sources.
• Having emergency response tools ready.

Memory trick: To stop a fire's start, remove the fuel, control the spark, and always be smart.

General safety guidelines for using non-powered hand tools to prevent injuries such as cuts, impacts, strains, and falls.

• Use the right tool for the job.
• Keep tools in good condition.
• Maintain proper footing and body position.

Memory trick: For every wrench and every twist, good footing is a safety assist.

The minimum safe distance excavated material (spoil pile) must be kept from the edge of a trench or excavation.

• Prevents material from falling back into the trench.
• Maintains stability of trench walls.
• Cal/OSHA requires a minimum of 2 feet.

Memory trick: Two feet keeps the dirt from tumbling in, ensuring the worker's safety within.

A sequence of actions taken to ensure safety before workers enter a confined space, focusing on hazard identification and control.

• Atmospheric testing is paramount.
• Ventilation may be required.
• Permit-required confined spaces have specific protocols.

Memory trick: To enter a confined space, first 'TEST' the air, then 'VENT' and 'PROTECT' with care.

Measures taken to minimize worker contact with lead-containing materials, particularly in older plumbing systems or specific components.

• Lead can be absorbed through skin, ingestion, and inhalation.
• Proper PPE, especially gloves, is crucial.
• Good hygiene practices (handwashing) are essential.

Memory trick: When facing hazardous stuff, gloves on, clean hands, that's enough.

Safe operating procedures for power drain cleaning machines (augurs) to prevent injuries from kickback, entanglement, or electrical hazards.

• Always wear appropriate PPE (gloves, eye protection).
• Ensure ground fault circuit interrupter (GFCI) protection.
• Release trigger or disengage clutch immediately upon binding.

Memory trick: When the tool kicks back, don't fight, just let go, and make it right.

Practices for safely storing flammable materials, especially when hot work (welding, cutting) is performed nearby, to prevent ignition.

• Separate from ignition sources.
• Use designated, well-ventilated areas.
• Maintain clear distances (e.g., 35 ft for hot work).
• Store in approved containers.

Memory trick: Distance and division prevent fiery fission.

The minimum safe distance that equipment, such as an excavator or crane, must maintain from energized overhead power lines to prevent electrocution.

• 10 feet for lines 50 kV or less.
• Distance increases with higher voltage.
• Always treat lines as energized.

Memory trick: Ten feet keeps you free from electrocution's fiery threat.

When grinding, eye protection must guard against high-velocity sparks, metal fragments, and abrasive debris.

• Always use primary eye protection (safety glasses).
• Secondary protection (face shield) is often required.
• Ensure both are impact-rated.

Memory trick: Grind with a guard, eyes and face safely scarred (not!).

The risk of body parts, hair, clothing, or jewelry becoming caught in moving machine parts, leading to severe injury.

• Common with lathes, drills, grinders, threaders.
• Remove jewelry, secure hair, wear fitted clothing.
• Never wear gloves with rotating machinery.

Memory trick: Spinning parts mean no loose starts.

A critical visual check of a chain hoist's components before each use to identify defects that could lead to equipment failure or injury.

• Focus on load chain, hooks, and rigging.
• Look for twists, kinks, wear, cracks.
• Ensure safety latches on hooks function.
• Never use damaged equipment.

Memory trick: Chain check, no wreck.

A systematic approach to minimizing exposure to hazardous fumes, prioritizing elimination, substitution, engineering controls, administrative controls, and finally PPE.

• Engineering controls (LEV) are preferred over PPE.
• Local exhaust captures at the source.
• General ventilation dilutes, but doesn't remove at source.
• Respirators are last line of defense.

Memory trick: Eliminate, Substitute, Engineer, Administer, PPE.

The electrical safety feature that provides a low-resistance path for fault current to flow to the earth, preventing electrical shock to the user.

• Requires a three-prong plug and grounded outlet.
• Protects against internal electrical faults.
• Often supplemented by GFCI protection.

Memory trick: Ground your gear, banish the fear.

Safe storage practices for oxygen and acetylene cylinders to prevent leaks, explosions, and mishandling.

• Separate oxygen and fuel gas cylinders.
• Store vertically and secured with caps.
• Ventilate storage area.
• Separate full and empty cylinders.

Memory trick: Separate, secure, ventilate, segregate - that's the cylinder fate.

Safety standard requiring portable ladders used for access to extend a minimum distance above the upper landing surface.

• Minimum 3 feet (36 inches) extension.
• Provides stable handhold for transition.
• Applies to all portable ladders.

Memory trick: Three feet high, reach for the sky (safely).

Hard hats are classified by type (impact protection) and class (electrical protection) to match specific workplace hazards.

• Type I: Top impact protection.
• Type II: Top and lateral impact protection.
• Class G: General electrical, 2,200V.
• Class E: Electrical, 20,000V.

Memory trick: Two types, three classes, for safety's hard hat mass.

OSHA mandates protective systems for trenches 5 feet (1.52 m) or deeper, unless a competent person determines that trenches less than 5 feet deep pose no cave-in risk.

• 5 feet or more in depth requires protection.
• Less than 5 feet deep may not require protection if deemed safe by a competent person.
• Protective systems include sloping, shoring, and trench boxes.

Memory trick: Five feet or more, make sure the trench is secure, or risk a safety roar!

A P-trap that has lost its water seal due to evaporation or siphoning, allowing sewer gases to enter a building.

• Common in seldom-used fixtures.
• Causes foul, sewage-like odors.
• Resolved by adding water to the drain.

Memory trick: Don't let the 'P' dry out, or the 'S' will get you!

Head protection, primarily hard hats, must meet specific ANSI (American National Standards Institute) standards to ensure adequate protection against impact, penetration, and electrical hazards in construction and industrial settings.

• ANSI Z89.1 is the standard for industrial head protection.
• Hard hats are classified by type (Type I for top impact, Type II for top and lateral impact) and class (G for general, E for electrical, C for conductive).
• Hard hats must be worn in areas with potential for falling objects, impacts, or electrical hazards.

Memory trick: Always wear your 'hard' thinking cap on the job site.

The maximum angle at which a horizontal drainage pipe can connect to a vertical stack to ensure proper waste flow.

• Ensures effective drainage
• Prevents turbulence and blockages
• Typically 45 degrees or less from the vertical

Memory trick: Smooth flow ensures no clog, like water down a slide, not a cliff.

The minimum depth of soil or fill required above an underground gas pipe to protect it from external forces, especially in areas subjected to vehicle traffic.

• Protects against physical damage
• Varies by location (e.g., driveway vs. non-driveway)
• Ensures safety and integrity of the gas system

Memory trick: Different paths, different depths, always protect the pipe from harm.