De-commission gas systems, installations and components in commercial properties and leisure accommodation

Business Sectors (Suites): Industrial and Commercial Gas Utilisation
Developed by: Energy & Utility Skills
Approved on: 30 Mar 2020


This standard is about de-commissioning gas systems, installations and components.  This could apply to temporary or permanent decommissioning.   It is for the commercial property and leisure accommodation parts of the non-residential downstream gas industry.  It can apply to gas systems, installations and components for any type of fuel gas or combinations of fuel gas.  
It includes checking systems are safe for de-commissioning, identifying and resolving problems with gas systems, installations and components, liaising with people from other trades and carrying out temporary or permanent de-commissioning.

This standard is for those who de-commission gas systems, installations or components in non-residential downstream, commercial properties or leisure accommodation.

Performance criteria

You must be able to:

1. work in line with plans, safe systems of work and risk assessments
2. check that conditions within the gas system will permit safe de- commissioning
3. confirm with input services personnel that the integrity and conditions in associated electricity, water, ventilation and flue/extraction systems will permit safe de-commissioning
4. select and use tools and equipment that are appropriate for de-commissioning activities
5. use designated safe isolation methods, tests, and procedures to de- commission gas systems, installations and components
6. verify that associated electricity, water, ventilation and flue/extraction systems and components have been de-commissioned and removed in line with safety requirements
7. ensure that temporarily and permanently de-commissioned appliances, systems, and components do not present safety hazards
8. remove and disconnect gas systems, installations and components in line with job requirements
9. remove, dispose of and recycle waste materials and system contents in line with safety and environmental requirements
10. liaise with responsible person(s) and other people who will be affected by the work to minimise disruption to work
11. comply with authorisation and verification processes that ensure correct working practices on other input services
12. liaise and cooperate with people from other trades at appropriate points in the work 
13. advise all people who are affected by work about any delays as soon as they occur
14. report any delays in work schedules to job supervisors in line with agreed reporting procedures
15. advise responsible person(s) of any unsafe situations, and actions required to remedy those situations, without delay
16. complete required records and documentation for de-commissioning
17. rectify any deficiencies in gas input services, reporting those you cannot rectify to appropriate person(s)
18. verify and report deficiencies in electricity, water, waste water, ventilation, flue/extraction and fresh air systems in line with procedures
19. interact with customers at appropriate times during your work

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
2. legislation covering the general responsibilities for own safety and that of others
3. the industry standards and stages involved in de-commissioning gas systems, installations and components 
4. how to use plans, safe systems of work and risk assessments
5. the tools and equipment necessary to provide safe access to work at heights, or in restricted or confined spaces
6. methods of working which protect building décor, customer property and existing systems and components
7. care and maintenance requirements of tools and equipment, and checks for safe condition
8. tools, equipment, materials and components required for de- commissioning
9. how to secure and store tools, equipment, materials and components to meet safety requirements and minimise loss or wastage
10. potential hazards that could arise from all de-commissioning, activities and the checks to be carried out before work takes place
11. authorisation and verification processes, roles and responsibilities which apply to working with other input services and personnel
12. steps to take should materials, components, tools and equipment not be available on site 
13. how to access and interpret required information including statutory and normative documents, industry standards, guidance documents and manufacturers’ instructions 
14. the range and operation of gas systems, installations and components
15. safe isolation methods, tests, and procedures to de-commission gas systems, installations and components
16. the procedures for temporary and permanent de-commissioning of appliances and gas systems including use of temporary continuity bonds
17. the precautions and measures used to prevent de-commissioned appliances or gas systems being brought into operation, use of temporary locking devices, safety and warning notices
18. the need to liaise with others whose procedures or routines may be affected by the suspension of gas appliances and gas system operation
19. the points in the de-commissioning process where co-operation and liaison with other trades and affected people may be required
20. steps to take when problems arise in work activities
21. job management structures and methods of reporting and recording job progress or problems delaying progress
22. how to safely collect and dispose of waste products that may be hazardous to health or the environment asbestos, insulation, electrical/electronic items and those containing fluorinated gases
23. how access and interpret industry regulations regarding the safe disposal of system contents that may be hazardous to health or the environment
24. how to isolate unsafe gas appliances, gas systems and components and apply gas industry unsafe situations procedures
25. procedures for completing de- commissioning records
26. how to communicate with customers and when it is appropriate to do so 


Scope Performance

Scope Knowledge





Links To Other NOS

External Links

Version Number


Indicative Review Date

30 Mar 2025





Originating Organisation

Energy & Utility Skills

Original URN


Relevant Occupations

Building and Civil Engineering Technicians, Design and Development Engineers, Electrical Engineer, Engineering Professionals, Engineering Technicians, Heating and Ventilating Engineer, Mechanical Engineer, Plumbers, Planning and Quality Control Engineers

SOC Code



De-commission; gas; systems; installations; components; commercial properties; commercial; leisure accommodation; de-commissioning; resolve problems; de-commissioning checks; temporary de-commissioning; permanent de-commissioning; appliance;