flue x2 Flashcards
When performing a safety verification of an existing gas installation to NZS 5255 states that the inspection must be supplemented by appropriate tests.
List FOUR tests that this may include.
- Room carbon monoxide testing
- Pressure and soundness testing
- Flue spillage testing
- Combustion testing
State who is to be provided with a copy of the safety verification results.
- The verifier
* The installation owner
List FOUR evaluation methods that may be used to provide evidence of compliance when
undertaking a safety verification of an existing installation.
- Documentation
- Interview
- Visual inspection
- Testing
- Questionnaire
The operation of a range-hood is causing products of combustion to spill from an open-flued
gas appliance.
Describe how a spillage test should be conducted.
- Close the appropriate doors and windows.
- Turn the range hood on.
- Start the gas appliance, let it run for 10 minutes.
- Open a window slowly until the appliance is no longer spilling.
- Measure the opening to work out the required vent size.
When designing a common flue, give THREE reasons why the flue connector rise would need to be increased by 300 mm.
- Outside the limits of Table H1.
- The diameter of the common flue is more than seven times the size of the flue connector.
- If the flue connector has more than two 90° changes of direction.
List FOUR locations where pressure test points are required on an installation.
- Outlet of gas regulators in gas pipework.
- Inlet and outlet of pressure raising devices.
- Outlet of the venting shut off system.
- Inlet of a gas appliance.
- Where a permanent pressure gauge is fitted.
State what is recommended good practice for completing the hot work once the section has been
fully isolated from the existing gas supply.
• Purge the installation with an inert gas.
• Purge the pipe to outside atmosphere.
• Purge 6 m away from ignition sources.
• Purge well clear of any openings into buildings.
• Continuously check air/gas ratios using a calibrated gas detector to indicate when the purge
is complete.
List THREE approved Codes of Practice relevant to gasfitting.
- Excavation for Foundations.
- Hazardous Substances.
- Noise in the Workplace.
- LPG multi-cylinder systems.
Explain the purpose of Approved Codes of Practice.
A set of guidelines to help you comply with recommended standards and requirements
State FIVE factors that need to be specified when selecting a regulator for a gas installation.
- Type of gas being used.
- Inlet or upstream pressure.
- Outlet or downstream pressure.
- Maximum flow anticipated.
- Size of pipework.
- Location.
List FOUR aspects related to a gas installation that must be taken into account before suitability
of a proprietary piping system can be confirmed as specified by AS/NZS 5601 Part 1.
- Measurement systems.
- Gas quality.
- Gas composition.
- Normal and emergency operating conditions.
- Environment conditions.
- Temperature.
- Pressure to which they will be subjected.
List SIX items of information that must be permanently marked on every gas appliance.
- Manufacturer.
- Model Number.
- Type of gas.
- Working pressure.
- Input rating.
- The gas safety compliance label.
A natural draft flue is being designed for a gas appliance.
State SIX factors to be taken into account when calculating the size of the flue.
- Shape of flue – circular or non-circular
- Input rating of appliance
- Length of the flue allowing for lateral runs
- Material of construction – heat loss
- Position – heat loss
- Size of flue spigot on appliance
- Any recommendations of appliance manufacturer
- Termination point
An installation is being converted from LPG to natural gas.
Give TWO aspects of the installation pipework that must be checked and that may need
changing.
- Size/diameter.
* Labelling.
State the specific compliance document that should be used for the installation of commercial catering equipment in a catering vehicle.
AS/NZS 5601: Part 1.
