Cert III Plumbing key terms

Equipment worn to minimise exposure to workplace hazards, such as safety glasses, gloves, hearing protection, high-visibility clothing and safety footwear. It is the last line of defence after higher-order controls.

A ranked approach to managing risk: eliminate the hazard, substitute it, use engineering controls, apply administrative controls, then use PPE. Higher-order controls are preferred because they protect more people more reliably.

A documented process that breaks a task into steps, identifies hazards at each step and records controls before work starts. Also called a safe work method statement in some contexts.

An enclosed or partially enclosed space not designed for continuous occupancy, with restricted entry and exit, and which may contain hazardous atmospheres or engulfment risks. Entry requires a permit, atmospheric testing and a standby person.

Any man-made cut, cavity, trench or depression in the ground formed by removing earth. Excavations must be assessed for collapse, services and access, and supported or battered where required.

Temporary support such as timber, hydraulic or steel bracing used to prevent the walls of a trench from collapsing onto workers. Shoring must be designed or selected for the soil conditions and depth.

A free referral service that provides information about underground infrastructure such as water, gas, electricity and telecommunications before excavation. Plans must be confirmed by locating and potholing services on site.

A leading cause of serious injury in plumbing, occurring from ladders, roofs, scaffolds and openings. Controls include guardrails, covers, fall-arrest systems, safe ladder use and exclusion zones below work areas.

Measures for working on roofs, including assessing roof condition and pitch, using edge protection or fall-arrest, securing ladders, and avoiding work in wet or windy conditions. Fragile roofs require specific controls.

A document provided by the supplier that describes a chemical's hazards, safe handling, first aid, spill response and disposal. It must be readily accessible wherever the substance is used or stored.

The safe storage, handling and disposal of plumbing materials such as solvents, fluxes, sealants and gases. It includes ventilation, fire precautions, segregation of incompatible substances and correct labelling.

Keeping compressed gas cylinders upright, secured, ventilated, away from ignition sources and segregated by type, with full and empty cylinders separated. Oxygen and fuel gas cylinders require specific separation distances.

Meeting present needs without compromising resources for the future. In plumbing it includes water efficiency, energy-efficient systems, waste reduction, recycling and preventing pollution of soil and waterways.

Using the least water necessary to achieve a task through efficient fixtures, leak control, pressure management and reuse where permitted. It is measured by flow rates, ratings and consumption targets.

Practices that prevent sediment, chemicals and waste from entering stormwater drains, such as sediment fences, covers, bunding and correct washout. Stormwater systems generally discharge untreated to waterways.

The standards, specifications and acceptance criteria a job must meet, including tolerances, testing, documentation and compliance with codes and Australian Standards. Work is inspected and tested against these before acceptance.

A certificate issued by a licensed plumber confirming that regulated plumbing work complies with the relevant Act, regulations and standards. It is provided to the customer and the authority as required.

The legal framework governing plumbing work, including licensing, permits, inspections, compliance certification and the adoption of the National Construction Code and referenced standards.

The performance-based code containing the Plumbing Code of Australia and Building Code of Australia. It sets minimum requirements for plumbing, drainage, gas, mechanical services and building work.

A nationally recognised technical document developed by Standards Australia, often referenced by the NCC and contracts. Examples cover plumbing and drainage, gas installations, welding and water supply.

A drawing that represents a real object at a fixed ratio, such as 1:100, so distances can be measured and converted. Understanding the scale is essential for setting out and ordering materials.

A scaled top-down drawing showing the layout of a building, services or site, including dimensions, fixtures, pipes and levels. Plans are read with elevations, sections and specifications.

Marking on site the positions, levels and alignments of fixtures, pipes and structures from the drawings. Accurate setting out prevents conflicts and ensures correct gradients and clearances.

The slope of a drain or pipe expressed as a ratio or percentage, such as 1:60, allowing gravity flow. Correct fall prevents blockages and self-cleansing velocities are maintained.

The system of pipes, fittings, inspection openings and traps that carries soil and waste water from fixtures to the sewer or treatment system. It relies on gravity, ventilation and correct gradients.

The installation of fixtures, traps, waste pipes and ventilation within a building to remove sewage and waste water safely and hygienically, while preventing foul air from entering occupied spaces.

A fitting that retains a water seal to prevent sewer gases from entering a building while allowing waste to pass. It must be self-cleaning, accessible and protected against siphonage.

A plumbing appliance or receptacle connected to the water supply and drainage, such as a toilet, basin, sink, shower or bath. Fixtures must be installed to manufacturer instructions and standards.

The level of the lowest inside surface of a pipe or drain at a given point. Invert levels are used to calculate gradients, depths and connections.

Testing a pipe system by filling it with water or air to a specified pressure and observing for loss over time. It confirms joints and materials are sound before the system is covered or commissioned.

The system of pipes, fittings, valves and fixtures that delivers potable or non-potable water at adequate pressure and flow. It must prevent contamination through backflow protection and correct materials.

Devices and arrangements that stop contaminated water from flowing back into a potable supply due to backpressure or backsiphonage. Examples include testable double check and reduced pressure zone devices.

Any actual or potential link between a potable water supply and a source of contamination. Cross-connections must be removed or protected by an approved backflow prevention device.

The system that collects and carries rainwater from roofs, paved areas and surfaces to a legal point of discharge. It includes gutters, downpipes, pits, pipes and detention or retention systems.

A storage vessel that collects roof runoff for reuse, such as garden watering or toilet flushing, subject to local rules. Installation requires mosquito-proofing, overflow, first-flush and backflow protection.

A weatherproofing material, usually metal, installed at roof junctions, penetrations and walls to direct water away and prevent ingress. Correct laps and sealing are essential.

The process of finding escaping gas using approved methods such as soapy solution, electronic detectors or pressure tests, never by flame. Suspected leaks require isolation, ventilation and reporting.

A valve installed on a gas line to shut off supply for maintenance or emergencies. It must be accessible, clearly identified and operated only by authorised persons.

The air required for complete burning of gas in an appliance. Inadequate combustion air causes carbon monoxide production and must be provided by permanent ventilation or appliance design.

A duct or chimney that carries combustion products from an appliance to outside air. It must be correctly sized, sealed and terminated to prevent spillage of gases into the building.

Heating, ventilation and air conditioning equipment and ductwork that controls temperature, humidity and air quality. Plumbing trades install and service associated pipework, condensate drains and refrigerant lines.

A fluid used in refrigeration and air conditioning systems that absorbs and releases heat as it changes state. Handling is regulated due to ozone-depleting and global-warming potential.

A joining process where a filler metal melts above 450°C but below the melting point of the parts, drawn into the joint by capillary action. It is common for copper pipework and refrigeration.

A joining method using a filler metal that melts below 450°C, typically with flux, to bond components such as copper fittings. Correct heat, cleanliness and flux are essential for a sound joint.

A joint formed by softening PVC surfaces with solvent and cement, then pressing them together so they fuse. Correct preparation, application and curing time are critical for pressure-tight joints.

Temporary structures or methods, such as shoring, benching or battering, used to keep excavation walls stable and protect workers and nearby structures from collapse.

The process of installing pipes to line and level, including bedding, jointing, alignment and backfill. Correct laying ensures flow, structural support and watertightness.

Mathematical work used in plumbing, such as pipe lengths, gradients, volumes, pressures, material quantities and costs. Accurate calculations reduce waste and ensure compliance.

The relationship between the force pushing water through a system and the volume delivered over time. Adequate pressure and flow are needed for fixtures and appliances to function correctly.

The implements used for cutting, drilling, bending, threading and joining pipes, including saws, presses and threaders. Tools must be inspected, used for their intended purpose and maintained.

The clear exchange of information with clients, supervisors, trades and authorities through speaking, listening, writing, drawings and digital tools. It prevents errors, disputes and safety incidents.

The way a plumber interacts with clients, including punctuality, clear explanation, respect, quoting, cleanliness and follow-up. Good service builds trust and repeat business.