NSW Gasfitting flashcards
NSW Gasfitting · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- AS/NZS 5601.1 scope
- The Australian/New Zealand standard covering gas installations downstream of the gas supply point, including consumer piping, appliances, flueing and ventilation for natural gas and LP Gas.
- Qualified supervisor certificate
- A NSW Fair Trading licence that authorises the holder to supervise and certify gasfitting work within the endorsed category, and to take legal responsibility for that work.
- Compliance certificate
- A document issued by the licensed gasfitter on completion of notifiable gas work, certifying that the installation complies with the relevant standard and regulations.
- Natural gas relative density
- Approximately 0.6 relative to air (air = 1), meaning natural gas is lighter than air and tends to accumulate at high points and in roof spaces.
- LP Gas relative density
- Approximately 1.5 to 1.6 relative to air, meaning LP Gas is heavier than air and accumulates in low points such as pits, drains and cellars.
- Stoichiometric combustion
- The ideal air-to-fuel ratio at which all fuel is burned with exactly the required oxygen, producing only carbon dioxide and water vapour with no excess air.
- Carbon monoxide
- A colourless, odourless, toxic gas produced by incomplete combustion; it binds to haemoglobin far more strongly than oxygen, causing oxygen starvation.
- Lower explosive limit
- The minimum concentration of gas in air that will support combustion; approximately 5% for methane and 2.1% for propane by volume.
- Pipe sizing pressure drop
- Consumer piping must be sized so the pressure drop from the supply point to the appliance does not exceed the allowable value in AS/NZS 5601.1 tables.
- Flexible connector rules
- Flexible connectors must be certified, of correct length, not concealed in walls or ceilings, and must not pass through floors or partitions.
- Flue terminal clearance
- The minimum distance a flue terminal must be located from windows, doors, air intakes and adjacent buildings, as specified in AS/NZS 5601.1 tables.
- Pressure test duration
- The time a consumer piping system must hold test pressure without loss, determined by pipe volume and material in accordance with AS/NZS 5601.1.
- Purging pipework
- The process of displacing air from pipework with gas before commissioning, performed to a safe location away from ignition sources with adequate ventilation.
- Gas rate formula
- Gas rate in MJ/h equals the meter volume in cubic metres multiplied by the gas heating value in MJ/m3, divided by the time in hours.
- CO/CO2 ratio
- A combustion analyser calculation indicating combustion quality; a ratio above the appliance manufacturer's limit signals incomplete combustion requiring service.
- Flame failure device
- A safety control that shuts off gas supply within a specified time when the flame is extinguished, preventing unburned gas release into the space.
- Gas leak isolation
- On detecting a leak, eliminate ignition sources, ventilate the area, isolate at the meter or cylinder, and notify the network operator or emergency services.
- CO alarm placement
- Carbon monoxide alarms should be installed near sleeping areas in accordance with the manufacturer's instructions and relevant product standards.
- LP Gas cylinder storage
- Cylinders must be stored upright, secured, away from ignition sources and heat, with quantities at domestic premises limited by dangerous goods requirements.
- Spillage testing
- A test performed after service or installation of open-flued appliances to confirm that products of combustion do not spill into the occupied space.
- Consumer handover
- On completion, the gasfitter must provide operating instructions, maintenance schedule, warranty details, compliance certificate and emergency contact information to the consumer.
- Combustion air requirements
- The volume of air required for complete combustion and dilution of flue products, determined by appliance input rating and room volume per AS/NZS 5601.1.
- Primary and secondary air
- Primary air is mixed with gas before the burner port; secondary air is drawn from the surrounding space to complete combustion at the flame.
- Flame lift diagnosis
- A flame that lifts off the burner port indicates excess primary air or excessive gas pressure, requiring adjustment of aeration or pressure regulation.
- Yellow flame diagnosis
- A yellow, luminous flame indicates insufficient primary air, blocked burner ports or incorrect injector size, leading to incomplete combustion and CO production.
- Meter timing gas rate
- A commissioning test where the gas meter dial is timed over a known volume to calculate actual gas input and compare it with the appliance rating.
- Copper pipe jointing
- Brazed copper joints must use silver solder with appropriate flux, and flux residue must be purged or flushed to prevent corrosion and contamination.
- Pipe support spacing
- The maximum distance between supports for consumer piping, specified in AS/NZS 5601.1 tables according to pipe size and material.
- Appliance data plate
- The manufacturer's label showing gas type, input rating, certification number and model; it must be checked before installation to confirm suitability.
- Excavation near gas mains
- Notification via dial-before-you-dig and hand excavation within the specified clearance of a gas main are required to prevent damage and leakage.
- Continuing professional development
- Ongoing training and updating of knowledge required as a condition of maintaining a NSW gasfitting licence and staying current with standards.
- False certification
- Certifying gas work that was not performed or supervised by the certifier; a serious breach of licensing obligations that may lead to prosecution.