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Gas application guide

Welcome to ESV’s step-by-step guide to the application and acceptance process for complex gas installations and Type B appliances.

The information below explains how the gas installation application and acceptance process works.

Click on the headings to the right of this page go to a particular section or follow the process step-by-step scrolling down the page

The Gas Safety (Gas Installation) Regulations 2008

The Gas Safety (Gas installation) Regulations 2008 (Part 4) require specific information be provided to ESV by persons seeking acceptance of a gas installation.

Required applicant information

The following applicant information is required:

  • Name of applicant
  • Business address
  • VBA licence number
  • Contact details, and
  • The installation address

Gas installation or Type B appliance information

Details about the complex gas installation or Type B appliance must also be provided.

The information required is dependent on a number of factors detailed in Schedules 7, 8, 9, 10 and 11, located at the end of the Regulations.

Thresholds have been set to categorise gas installations – the information required depends on the category of the gas installation.

Applications for all complex gas installations must include the information listed in Schedule 7 of the Regulations.

However, section 31 (2) of the Regulations state that if the gas installation is to:

  • have a total gas rate exceeding 3.8 gigajoules (3800 MJ) per hour, or
  • have an operating pressure exceeding 200 kilopascals, or
  • be installed in a building exceeding 10 storeys above ground level

Then an application must contain or be accompanied by the information listed in Schedule 8, in addition to the Schedule 7 requirements.

If a gas installation contains a Type B appliance, an application for acceptance of the gas installation must also contain or be accompanied by the information listed in Schedule 9.

Schedules 7, 8, 9, 10, 11

Following are excerpts taken directly from the Gas Safety (Gas Installation) Regulations 2008 which detail the information to be provided when making an application for acceptance of a complex gas installation or Type B appliance to ESV.



(Section 73)

(Regulation 31(1))

  1. Details of person seeking acceptance of the gas installation—
    Full name:
    Phone number:
    Registration number:
    Email address:
    Facsimile number:
  2. Address of gas installation.
  3. Consumer’s name and site contact name.
  4. Type of work.
  5. Type of gas.
  6. Summary of work.
  7. Commencement and completion dates for work.
  8. Details of:
    (a)        the gas rate (only if the rate is to exceed 38 GJ/h);
    (b)        the operating pressure (only if the operating pressure is to exceed 200kPa);
    (c)        whether or not the building exceeds 10 storeys above ground level.



(Section 73)

(Regulation 31(2))

  1. Details of the gas installation, including drawings of:
    (a)        the general arrangements of the consumer piping;
    (b)        the location of valves, pressure control regulators and other controls or devices installed within the piping;
    (c)        the location of any gas meter (but not the gas company’s meter);
    (d)        piping designed to safely discharge gas from safety or control devices; and
    (e)        any associated electrical circuit diagrams.
  2. Details of design, calculations, test and commissioning procedures including:
    (a)        calculations of pressure loss;
    (b)        testing for gas tightness;
    (c)        purging associated with commissioning or decommissioning piping; and
    (d)        commissioning pressure control and other pipeline devices.
  3. Details of all control or other devices installed within the piping, including:
    (a)        manufacturer’s data sheets; and
    (b)        proposed settings of all adjustable devices.



(Section 73)

(Regulation 31(3))

  1. Appliance details
    Details regarding the appliance, including where relevant:
    (a)        Manufacturer’s name.
    (b)        Model identification.
    (c)        Nominal gas consumption (MJ/h).
    (d)        Gas type.
    (e)        Maximum and minimum gas supply pressures.
    (f)        Purge times.
    (g)        Gas pressure at burner head for the nominal gas consumption.
    (h)        Combustion chamber volume.
    (i)         Purge volume, being the total volume swept from the entry of the purge medium to the point of emission including interconnecting ductwork.
    (j)         Serial number.
    (k)        Date of manufacture.
  2. Description of the appliance function and any associated industrial process with which the appliance is integrated together with a drawing indicating the general arrangement.
  3. Valve train schematic diagram
    A schematic diagram clearly indicating:
    (a)        All components (including brand and model) and component acceptance numbers.
    (b)        Rated working pressure of all components.
    (c)        Proposed settings of all adjustable devices.
    (d)        Nominal gas consumption.
    (e)        Supply pressure at appliance and burner pressure.
  4. Electrical circuit diagram
    A circuit diagram in ladder-logic format clearly indicating:
    (a)        Safety and control circuits.
    (b)        Details of all major components (including brand and model).
    (c)        Method of operation of all major components.
  5. Process and instrumentation diagram clearly indicating the relationship between the safety and control functions of the appliance/process.
  6. Purge time calculation
    Calculation of the time required to purge the appliance in accordance with AS 3814.
  7. Safe start gas rate
    Where required by AS 3814, calculation of the safe start gas rate or the critical time for ignition or critical energy.
  8. Explosion relief area and dilution air flow rate (where relevant)
    If the appliance process involves solvents or dusts and where required by AS 3814, provide details of, and calculations for, explosion relief area and dilution air flow rates.
  9. Details of flueing.
  10. Details of ventilation.
  11. Commissioning procedures and operating instructions.
  12. In the case of a Type B appliance with a nominal gas consumption of more than 1000 megajoules per hour, the gross thermal efficiency over its designed operating range and a statement comparing the appliance’s efficiency with the best available performance in its class.



(Section 73)

(Regulation 31(5))


I certify that this gas installation will meet the requirements of the Gas Safety Act 1997 and the Gas Safety (Gas Installation) Regulations 2008.




(Section 73)

(Regulations 31(6) and 33(3))


I certify that this gas installation meets the requirements of the Gas Safety Act 1997 and that the required tests have been carried out and it will be safe for gas to be made available to the consumer.


How ESV processes a gas application

Initial review

When ESV receives an application it is entered or reviewed in GasTrac to ensure the required information has been provided and the required schedules are complete. Incomplete or incorrect applications may be returned and not processed or additional information may be sought.

Allocation and initial processing

The application is allocated to a Gas Safety Officer (GSO) and assessed to determine the acceptance conditions required for the gas installation.

The applicant may be requested to provide additional information to enable ESV to establish the appropriate acceptance conditions.

In most cases complex gas installations applications will be processed within five working days and Type B appliance applications in 10 working days.

Application rating

Gas Safety Officers determine, in conjunction with system-based risk assessments, whether the application requires an inspection. This determination is based on information supplied by the applicant or information available to the Gas Safety Officer via GasTrac (e.g. location of gas installation, applicant non-compliance history).

Acceptance conditions

ESV will set certain conditions based on the work being undertaken. For example, ESV may request a Consumer Piping Test Report and/or a letter confirming the method or material used to protect combustible surfaces for a complex gas installation. ESV will advise the applicant of the set conditions and provide access to any relevant forms, such as the Consumer Piping Test Report.

A site inspection may also be specified as an acceptance condition. Conditional acceptance correspondence advises the applicant that the gas installation will be inspected.

If the application is assessed as requiring an inspection, it will be conducted prior to the issue of gas supply approval and / or final acceptance of the gas installation.

ESV will expect the set conditions to be met within a few days of the installation being completed. When the set conditions have been met, the installation will be accepted and closed off in GasTrac.

Onsite inspection

Either the applicant contacts ESV to arrange an inspection, or ESV may contact the applicant when the Statement of Compliance (Schedule 11) has been received by ESV. The inspection appointment will be made for a mutually agreed time. The applicant must provide ESV as much prior notice as possible to ensure the customer’s requirements can be met.

The inspection process will involve an onsite examination of the gas installation by the Gas Safety Officer accompanied by the licensed person.

The inspection is usually carried out when gas work on the installation is complete.

An installation found to be compliant after the site inspection will be accepted by ESV.

Alternatively, identified non-compliances will be recorded and a Notice of Non-Compliance issued to the licensed person. The Gas Safety Officer will specify a reasonable time period for the outstanding items to be rectified.

The applicant must formally advise ESV when the non-compliances have been rectified. An inspection may be conducted to confirm the gas installation is now compliant.

Final Acceptance

An ESV number is issued to the licensed person for the complex gas installation or a Compliance Plate affixed to the Type B appliance as part of the final acceptance process.

Gas supply can only be arranged with the gas retailer after an ESV number has been issued and a Gas Supply Approval letter sent by ESV to the gas distribution company.

Final Acceptance is confirmed with the applicant by formal correspondence and the application for acceptance is now complete.

Random audits

Completed gas applications may be subject to audit. ESV will contact the applicant or the client to arrange an acceptable time to conduct a safety audit on a gas installation.

Any identified safety issues will be recorded and an Improvement Notice issued to the person who is able to resolve the issues. When the safety issues have been rectified, the signed Improvement Notice must be returned to ESV.

Unsafe installations

If, at any time during the acceptance process or an audit, a hazardous or unsafe installation is encountered, the Gas Safety Officer will instruct the appropriate person to take immediate appropriate action to render the gas installation safe. This may involve disconnecting and capping a section of the installation or disconnecting and capping the gas supply.

An Improvement Notice or Prohibition Notice may also be issued to the licensed person where non-compliances are identified. These Notices are supported by the Gas Safety Act 1997 and carry penalties for failing to comply with the Notice.

Refer to the Gas Safety Act 1997 for details.

Contact us

If you have any queries in relation to complex gas installation applications, please contact our Gas Technical Helpline directly on 1800 652 563 or at