Install and remove positive displacement gas meters and regulators

Business Sectors (Suites): Downstream Domestic Gas Installation and Maintenance
Developed by: Energy & Utility Skills
Approved on: 01 Jan 2022


This standard is about installing, exchanging and removing positive displacement gas meters and regulators.  This could be for new installations, exchanging or replacing existing gas meters and regulators or for removing obsolete ones.  Meters can be:
primary or secondary 
diaphragm or rotary displacement 
from 2.5 to 1076m3/hr 
on low pressure gas systems of up to 75mbar (medium pressure in Northern Ireland)
in domestic and non-domestic settings.

This standard covers all aspects of installing, exchanging, replacing and removing gas meters and regulators including the disconnection, de-commissioning and commissioning that is involved.  It can apply to any type of fuel gas or combinations of fuel gas including, but not restricted to, natural gas, LPG, blended or 100% hydrogen.

This standard should be used in conjunction with:
EUSDSG54 Prepare to work on gas systems or appliances in domestic settings; and
EUSDSG15 Carry out gas tightness testing and check system safety  in small settings

This standard is for gas first responders.

Performance criteria

You must be able to:

1. Make sure all operational checks have been carried out prior to starting work
2. Check existing installation for any unsafe appliances and system components and apply gas industry unsafe situation procedures when required
3. Make sure installation plans take account of whether gas meters and regulators are primary or secondary meter installations 
4. Make sure the siting of the emergency control valve (ECV) and meter inlet valve (MIV) is accessible, correctly labelled and that they operate correctly
5. Check the siting of any bypass valves, non-return valves, filters and pressure test points to ensure they are accessible, correctly labelled and the correct operation is achieved. 
6.      Confirm that the siting of meter housing and proximity distances of meter boxes and vent-discharges can be achieved and meets the manufacturers’ and industry standards’ requirements for location, siting and clearances 
7. Identify and make appropriate plans to deal with any effects the siting of the existing gas supply and it’s proximity to other services may have on installation requirements 
8. Check that conditions within gas and earthing systems will permit safe de-commissioning and re-commissioning
9. Select and use the correct tools, test equipment and other equipment for all aspects of the work
10. Use designated safe isolation methods, tests, fittings and procedures to de- commission gas and earthing systems and components in line with requirements
11. Take precautionary actions to ensure that temporarily de- commissioned appliances, systems, or components are labelled and do not present a safety hazard
12. Minimise damage to customer property and building features throughout all stages of work
13. Disconnect and remove any gas meters, regulators, gas systems and components, and earthing system components in current use in line with installation plans 
14. Mark any live gas pipes with a notice to indicate they contain gas
15. Carry out a visual check of new gas meters and regulators for any damage, that seals are intact, that all packaging is removed and that gas ways are clear
16. Fabricate and assemble gas meter and regulator system components in line with installation requirements
17. Position gas meters and regulators and confirm they meet location, siting and clearances required by manufacturers’ and industry standards’ specification
18. Ensure that gas meters and regulators are protected against any potential mechanical damage in line with industry standards 
19. Cap, plug or valve off any unused tappings and vent or purge points
20. Confirm that the provision of ventilation meets the gas meter and regulator manufacturers’ and industry standards’ requirements for the installation and system
21. Ensure existing gas systems are clean and free of debris
22. Recognise when gas and earthing systems are required in line with installation requirements
23. Check and confirm that all pressure test records for gas system and components are complete
24. Use appropriate test equipment and procedures to confirm the integrity of installed gas meters, regulators and gas systems and the safe permanent de-commissioning when required 
25. Complete meter labelling to required industry standards
26. Ensure there is continuity of gas supply for any installations with a meter bypass system 
27. Check and confirm the gas system operating pressures meet industry standards and are between 19 and 23 mbar
28. Carry out full visual inspections to identify evidence of poor combustion and the general condition of gas meters and regulators before completing work
29. Confirm meter installation and operation complies with manufacturers’ specifications, industry standards, safety schemes and regulations
30. Use electrical testing procedures to confirm the integrity of installed earthing systems and components in accordance with industry standards
31. Complete all relevant documentation and paperwork in line with industry standards
32. Instruct property occupiers on the correct operation of gas systems, valves and components and provide them with their copy of any literature
33. Resolve problems within own area of responsibility and competence in accordance with approved procedures 
34. Advise of any delays to the work, unresolved problems, unsafe situations and required remedial actions to those who require the information
35. Use warning notices to prevent unauthorised use of un-commissioned gas meters and regulators, gas appliances, gas systems and components 
36. Complete and attach emergency notices on or near meters or at ECVs if remote from primary meters

Knowledge and Understanding

You need to know and understand:

1. Regulations and guidance governing health and safety in the workplace, environmental protection and the use of risk assessments for domestic and non-domestic installations including safe access, working at heights and substances hazardous to health 
2. Legislation covering your general responsibilities for your own safety and that of others
3. The limits of your own autonomy and responsibility
4. Gas industry unsafe situations procedures and how to isolate unsafe gas appliances, gas systems and components 
5. Potential hazards that could arise from all de-commissioning, installation and commissioning activities and checks to be carried out before work takes place
6. Required pre-work checks including operating pressures and volumes 
7. How to access and interpret normative documents, industry standards guidance documents, manufacturers’ instructions, industry standards, safety schemes and regulations
8. Industry standard practices for new installations, exchanging and replacing existing positive displacement gas meters and regulators or for removing obsolete ones
9. Industry practices, work standards and safety precautions for location, siting, clearance and fixing of:
a) positive displacement gas meters, regulators, components, emergency control valves (ECV’s) and meter inlet valves (MIV’s) 
b) positive displacement gas meters as primary or secondary installations with or without meter housings
10. Other services that may have an effect on the siting of installations including electrical switchgear, heating or process equipment
11. Safe isolation methods, tests, and procedures for temporary and permanent de-commissioning of positive displacement gas meters, regulators, gas systems, components and earthing systems including use of temporary continuity bonds, non-contact voltage detectors, Voltage indicators, Proving units, Multimeters
12. Measures to prevent un-commissioned and de-commissioned positive displacement gas meters, regulators, gas systems and components being brought into operation 
13. Industry standards’ ventilation requirements for positive displacement gas meters and regulators
14. How to measure and record installation and site details for prefabrication 
15. How to confirm that services and systems requirements are adequate for installation, extending the system or adding components of new positive displacement gas meter, regulator and components 
16. The procedures and work methods for connecting to input services including gas, earthing systems and ventilation
17. Methods of working which protect building décor, customer property and existing systems and components
18. Safe processes and procedures for applying tightness testing and purging and electrical testing to appliances, gas systems and components to ensure safe functioning
19. The tools, test equipment and other equipment, materials and components required for the positive displacement gas meter and regulator system de-commission, installation and commission and how to secure and store them
20. How to identify positive displacement gas meter installations that incorporate non-return valves and the manufacturers’ and industry standards’ installation requirements
21. How to identify positive displacement meter installations that incorporate a meter bypass and how to ensure continuity of supply including checking bypass valves are opened prior to gas meter removal and recording the time that system is on bypass
22. Assembly and installation requirements for positive displacement gas meters including oiling of rotary displacement meters 
23. Procedures for checking the correct and safe function, operation and performance of domestic and non-domestic positive displacement gas meters, regulators and components including visual inspection
24. Procedures for checking and confirming gas system operating pressure is correct 
25. The procedures for adjusting meter regulators
26. How to safely collect and dispose of system contents that may be hazardous to health or the environments
27. The steps to take when problems arise with positive displacement gas meters, regulators, gas systems and components including defects, cannot be restored to full performance not meeting design requirements, incorrect system operating pressures or mbar range
28. Job management structures and methods of reporting and recording job progress or problems delaying progress
29. How to complete all installation and commissioning documentation and records to be left with the property including landlord/homeowner gas safety records, meter details, meter labels, emergency notices, ECV labels, pressure labels
30. System handover procedures and how to demonstrate the operation of gas systems, valves and components to end users


Scope Performance

Scope Knowledge





Links To Other NOS

External Links

Version Number


Indicative Review Date

01 Jan 2025





Originating Organisation

Energy & Utility Skills

Original URN


Relevant Occupations

Emergency First Responders

SOC Code



install, installation, gas, meters, regulators, (2.5 to 1076m3/hr)