RGII Domestic Gas Safety study plan
RGII Domestic Gas Safety · Give each week a clear focus.
8 weeks · About 7 hours per week
Domestic Gas Appliances: Installation, Commissioning and Servicing & Gas Properties, Combustion and Ventilation
Map the commissioning sequence for a domestic gas boiler and a gas hob from memory, listing each check in order and the reason it sits there
Explain the relationship between gas family (natural gas vs LPG), Wobbe number, and injector sizing, and state why an appliance must not be converted without the manufacturer's kit
Calculate stoichiometric air requirement and CO2/CO ratios for methane and propane combustion, and identify the symptoms of incomplete combustion from flue gas readings
Describe the three elements of the fire triangle as applied to gas explosions and the concept of flammability limits for methane in air
List the ventilation requirements for a domestic appliance installed in a compartment, distinguishing purpose-provided ventilation from adventitious ventilation
Your checkpoint
A one-page commissioning checklist for two appliances plus a worked combustion calculation sheet with air-requirement and CO2 figures for methane and propane
Domestic Gas Appliances: Installation, Commissioning and Servicing & Gas Properties, Combustion and Ventilation
Write out the pre-installation survey checks for an appliance replacement, covering gas supply adequacy, flue route, and combustion air
Explain gas rate measurement by meter reading and by regulator pressure drop, and calculate expected gas rate from appliance heat input
Describe the procedure for checking and setting burner pressures on a range-rated appliance and state the tolerance applied
Identify the safety devices found on domestic appliances (flame supervision, overheat, spillage, oxygen depletion) and state what each protects against
Explain why a spillage test is performed and describe the conditions under which an appliance fails it
Your checkpoint
A completed appliance survey and commissioning record for a fictional installation, including gas rate calculation, burner pressure check, and spillage test outcome
Pipework, Fittings, Jointing and Pressure Testing & Safety Checks, Tightness Testing and Purging
Specify pipe sizing for a domestic installation using the pressure drop method, selecting diameter from length, load, and allowable drop
Describe the accepted jointing methods for domestic gas pipework and state which are prohibited and why
Write the tightness testing procedure for a new installation and for an existing installation, including test pressures and stabilisation periods
Explain purging of a gas installation, including volume calculation and the point at which the installation is considered purged
Identify the documentation and labelling required after pressure testing and purging
Your checkpoint
A pipe sizing calculation and a written tightness test and purge procedure for a two-appliance domestic installation, with test pressure, duration, and allowable drop stated
Legislation, Regulations and Standards (Gas Safety Framework) & Unsafe Situations, Warning Notices and Emergency Procedures
Summarise the duties placed on a gas operative by the Gas Safety (Installation and Use) Regulations, including the obligation not to leave an unsafe appliance connected
Classify unsafe situations using the recognised categories and match each category to the correct warning notice and action
Describe the procedure for dealing with an immediately dangerous situation, including isolation, warning, and notification
Explain the role of the emergency control valve and the circumstances in which an operative may isolate the whole supply
State the record-keeping and notification requirements that follow the issue of a warning notice
Your checkpoint
A decision table mapping six worked unsafe-situation scenarios to category, warning notice type, isolation action, and notification step
Meters, Emergency Control Valves and Supply Connections & Flues, Chimneys and Combustion Product Discharge
Describe the installation requirements for domestic gas meters, including position, protection, ventilation, and emergency control valve location
Explain the checks required when a meter is exchanged or a new supply connection is commissioned, including regulator and installation soundness
Identify the flue types used on domestic appliances (room-sealed, open-flued, balanced, fan-draught) and state the terminal position rules for each
Explain the flue flow and spillage checks for open-flued appliances and the conditions that cause flueing failure
Describe the inspection of a chimney or flue for integrity, correct sizing, and adequate termination
Your checkpoint
An annotated flue terminal position diagram with dimensions and a meter installation checklist covering position, ventilation, and ECV arrangement
Flues, Chimneys and Combustion Product Discharge & Safety Checks, Tightness Testing and Purging
Perform a full safety check sequence on an existing installation, covering visual inspection, tightness test, and appliance safety checks
Explain the difference between a tightness test and a let-by test and describe when each is required
Describe the checks applied to a flue during a safety check and the criteria for classifying a flue defect as unsafe
Explain the procedure for re-establishing gas supply after isolation, including purging and relighting
Identify the records and labels that must be left after a safety check on a rented property
Your checkpoint
A completed safety check record for a fictional property with three deliberately introduced defects, each classified and justified
Gas Properties, Combustion and Ventilation & Unsafe Situations, Warning Notices and Emergency Procedures & Legislation, Regulations and Standards (Gas Safety Framework)
Explain the causes of incomplete combustion in domestic appliances and the corrective actions for each cause
Describe ventilation requirements for appliances in internal spaces and calculate the required free area for a given appliance input
Work through five unsafe-situation scenarios and justify the category assigned using regulation and risk of harm
Explain the requirements for warning notices, including what must be recorded and who must be informed
Summarise the operative's duty to report and the consequences of failing to classify an unsafe situation correctly
Your checkpoint
A written response to five mixed unsafe-situation and combustion scenarios, each with classification, action, and the regulation or principle relied on
Legislation, Regulations and Standards (Gas Safety Framework) & Pipework, Fittings, Jointing and Pressure Testing & Meters, Emergency Control Valves and Supply Connections & Domestic Gas Appliances: Installation, Commissioning and Servicing & Flues, Chimneys and Combustion Product Discharge & Safety Checks, Tightness Testing and Purging & Unsafe Situations, Warning Notices and Emergency Procedures
Complete a full timed mock examination across all eight domains and record the score by domain
Re-derive the pipe sizing, gas rate, purge volume, and ventilation free-area calculations without notes
Recite the unsafe-situation classification and warning notice procedure from memory
Review every domain scoring below 70 percent and list the specific facts to relearn
Build a one-page pre-exam reference sheet limited to figures, tolerances, and classification rules
Your checkpoint
A timed mock exam result with per-domain scores and a one-page reference sheet of key figures and classification rules
Milestones
Week 2: Explain from memory the commissioning sequence for a boiler and a hob and calculate expected gas rate for a stated heat input without notes
Week 4: Correctly classify four out of five unsafe-situation scenarios and name the matching warning notice and isolation action for each
Week 6: Complete a tightness test procedure and a flue terminal position check with all test pressures, durations, and dimensions correct
Week 8: Score at least 80 percent overall on the timed mock exam with no domain below 70 percent