General Flashcards
The air from a plant room is removed via mechanical ventilation.
State TWO adverse situations that AS/NZS 5601 Part 1 requires that the system be tested for.
- No appliances are deprived of air required for combustion
* The air pressure is not less than atmospheric at a gas appliance.
When consumer gas pipework is installed into high a rise building, a plan of the consumer piping must be displayed.
(i) State where the plan is to be displayed.
Fire control room or in a prominent place.
Give TWO requirements that the displayed plan must meet.
- Detail the location of all emergency manual shut off valves.
- Vermin proof and weather proof.
Give THREE safety aspects that should be checked before using a cherry picker to access a high point on the exterior of a building.
- Position of power lines.
- Stability of ground.
- Operator of the cherry picker is trained.
Give FOUR factors that need to be considered when designing a flue system for a gas appliance
- Length of flue.
- Material of flue.
- Ventillation.
- Heat loss.
Other than creating a COC, list TWO further documents or forms that must be completed after the work has been finished.
List SIX items of information that a COC must contain.
- Gas Safety Certificate (GSC)
- High Risk Gas Record
- The type of gas
- The gas pressure
- The location of the gas installation
- The date(s) on which the work was done
- Signature of the person issuing the certificate
- The name and registration number of the person issuing the certificate
A boiler fitted with a package burner operates on natural gas.
(a) State THREE conditions that must be met before an accurate flue gas analysis can take place.
- Burner is operating at full fire.
- Readings are taken in the centre of the flow of products of combustion.
- Take measurements as close as possible to the appliance.
Give THREE flue gas measurements that are needed to calculate the boiler efficiency (flue gas analysis).
- Flue gas temperature.
- Carbon dioxide CO2 ratio to air
- Oxygen percentage
A gas-fired storage water heater is not in operation.
Give THREE indicators that the flue has a blockage.
- Soot in and around the entrance to the combustion chamber.
- The thermal fuse has been activated.
- Heat damage to the valve assembly above the combustion chamber entrance.
Give TWO indications that the flue in (a) is blocked while the appliance is in operation.
- Flames or heat spilling out the front of the burner chamber.
- Wafting, lazy, vitiated flame not receiving secondary air supply.
State FIVE factors that may impact on the overall efficiency of a gas-fired storage hot water system
- Insulation around the heater.
- Insulation of hot water pipework.
- Location of appliance relative to hot water usage.
- Capacity of heater compared with water demand.
An installation with pressures exceeding 7 kPa is fitted with a pressure test point.
State the special feature that the pressure test point must have.
Test points must be self-sealing type.
Name the TWO parties that must be advised when a gasfitter finds an installation that presents immediate danger.
- The owner or occupier of the property where the danger exists.
- WorkSafe New Zealand.
State what information must be given to both of the parties in
Details of the nature of the danger.
The gasfitter is also required to advise one party to perform a task.
owner or occupier to inform the gas retailer or gas wholesaler of the danger.
