Minimise risks to life, property and the environment during gas emergencies

Business Sectors (Suites): Gas Network Construction Operations
Developed by: Energy & Utility Skills
Approved on: 01 Mar 2023


​This standard is about identifying, assessing, prioritising and minimising risks and hazards for gas emergencies.  This standard applies to gas escapes that take place between gas terminals and emergency control valves/ meters.  

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 does not imply that there is one sequential method of responding to reported gas emergencies. The nature of gas escapes are unpredictable and need to be dealt with on an individual basis. It involves making sure that all the work is carried out safely in accordance with industry specific operational procedures and systems associated with risk reduction and removal.

This standard is for gas network operatives who deal with gas emergencies.

Performance criteria

You must be able to:

​1. Proceed to reported emergency situations without delay to meet minimum response standards, reporting arrival on site to appropriate people

2. Position vehicle and equipment to avoid ignition dangers
3. Confirm received job information with emergency dispatch control centre to ensure you have complete, accurate and up-to-date information to assist in effective location and isolation of emergencies
4. Check all work and personal protective equipment and tools necessary for all stages of the work is available, in date, correctly calibrated, safe to use and fit for purpose
5. Carry out site-specific risk assessments, establish and maintain a safe working area and work safely at all times in accordance with health, safety, environmental and other regulations and requirements, approved industry practices and procedures and organisational policies 
6. Survey work sites and building fabric for any existing damage or defects and protect them against any further damage being caused during emergency work, recording findings and advising property owners of any defects in line with company procedures
7. Liaise with and update emergency dispatch control centre, emergency services, HSE, property occupiers and other people affected at key stages throughout gas emergencies
8. Summon additional resources and support from services and authorities when required in response to incidents
9. Utilise an appropriate plant location and equipment avoidance survey to establish siting and locations of gas supplies, IGT sites, other services and utilities and areas of special interest, accessing maps of utilities plant where applicable 
10. Locate underground plant using plant avoidance tools and equipment and make bar holes in appropriate places
11. Force entry to locked or unoccupied properties in line with company and industry procedures 
12. Check for, and record, visual signs, smells, and gas ingress from internal spaces, voids, and around properties and from incoming services and utilities in accordance with industry standards and procedures
13. Take and record appropriate internal and external gas, and other atmosphere samples in all adventitious openings in accordance with industry standards and procedures
14. Identify the extent of investigation areas in line with industry practices and procedures 
15. Undertake site surveys to determine the location, extent and levels of gas escape and assess and record the severity of hazards and emergency implications for people and property
16. Categorise outcomes of site surveys and agree actions required for escape prioritisation of any unsafe situations in consultation with senior person on site in accordance with industry standards and procedures
17. Carry out excavations to vent and prevent underground tracking gas from entering properties, voids, ducts and other street furniture
18. Take prompt action to evacuate people, create safety zones, isolate gas and electricity supplies, eliminate actual and potential sources of ignition, place fire extinguishers ready and ventilate properties as appropriate in line with findings and industry procedures
19. Take precautionary steps to prevent unauthorised re-entry to evacuated areas by using barriers, tape and warning signs
20. Carry out temporary repairs when necessary in line with industry procedures 
21. Monitor, recheck and record levels of gas  concentration both inside and externally around properties or work sites at regular intervals during and after the repairs have been carried out, before leaving the site and before authorising re-occupation
22. Check gas system operating pressures meet industry standards 
23. Use appropriate test equipment to check operating pressure meets industry standards
24. Resolve problems within own area of responsibility and competence in accordance with approved procedures 
25. Complete and submit all relevant documentation and paperwork of test results and actions taken using company reporting systems and documentation, and in accordance with statutory requirements in line with industry standards
26. Report any interruptions to gas supplies, poor pressures, delays to the work, unresolved problems, unsafe situations and required remedial actions to those who require the information
27. Establish and confirm that work sites are safe to leave following repair or when no leak was detected in line with industry procedures

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 including safe access, working at height, excavations and working in confined spaces

2. Legislation covering your general responsibilities for your own safety and that of others and the limits of your own autonomy and responsibility
3. Gas industry unsafe situations procedures including concern for safety, at risk, immediately dangerous and reporting of injuries and dangerous occurrences and how to isolate unsafe gas appliances, gas systems and components 
4. Your health and safety obligations including assessing and prioritising hazards, taking action to minimise risks in order of priority, monitoring effectiveness of risk control measures, re-assessing risk on a regular basis and recording hazards 
5. Industry practices and procedures regarding the minimum extent of investigation area when dealing with gas escapes
6. Information to be included in site-specific risk assessments including gas emergency, access to the work site, movement of the workforce, members of the public, and the movement and safe storage of materials, tools and equipment for the job
7. Industry practices, procedures, precautionary measures and actions to make safe identified hazards within a potentially gaseous environment including; minimising risk of ignition, minimising escapes, evacuation of property and adjacent property, forced entry, minimising escapes, creating safety zones, positioning of vehicles and equipment, use of temporary continuity bonds, preventing smoking, having fire extinguishers ready, utilising all appropriate PPE and safety equipment, wetting the work area and maximising ventilation in all voids, ducts, drains, cellars
8. Information to include in a site survey including type of gas, controlled or uncontrolled, spread and level of gas concentrations and readings, whether the escape is external to properties or tracking internally into them, location of nearest properties, location of confined spaces, presence of other utilities where gas can track, presence of ignition sources, density of motorised and pedestrian traffic, the level of ventilation, any electrical concerns, availability and access to isolation method, gas pipe material, any escape history, any visual signs of previous work, weather and ground conditions and no trace results
9. The range of places from where gas samples should be collected, both high and low, including in bar holes, voids, drains, ducts, sewers, cellars, telecommunication ducts, in or around plant and street furniture, in or around governor housings and chambers 
10. Industry practices, work standards routines and sequences for dealing with gas escapes, gas incident investigations and other emergencies
11. Methods of working which protect the building, customer property and existing gas systems and components
12. Different types of ground conditions and the potential for escaping gas to track to open ground
13. The range of tools, test and other equipment and materials required, procedures for ordering, supplying, checking and delivery and steps to take if they are not available including gas detection equipment, personal protective equipment, electric detection equipment, plant avoidance tools and equipment and equipment for making bar holes
14. Care, maintenance and storage requirements of tools and equipment, and checks for safe condition including the purpose of PAT testing
15. The characteristics and properties of LPG and other gases
16. The organisational standards of service for attending uncontrolled and controlled gas escapes
17. Industry standards, safety schemes, regulations, practices and procedures for carrying out gas emergency activities including reported gas escapes, reporting injuries and dangerous occurrences, fire or explosion, loss or interruption to gas supply, poor pressure reports at non domestic properties, suspected theft of gas, no trace situations including re-checks, lack of access or no access to properties, environmental reporting of unplanned releases, gas incident investigations
18. Regulations and their implementation related to rights of entry and its implementation including; accessing properties, notification to emergency dispatch control centre and line manager and the implications
19. Industry practices, techniques and procedures for carrying out barholing and excavations and roads and streetworks requirements before and after completing barholing and excavation activities 
20. The industry practices and procedures for escalation of gas escapes including when, how and who to report to, responding to high pressure escapes from national or local transmission systems from pipelines and above ground installations, re-occupation of properties following evacuations, identifying and responding to gas clouds, responding to interruptions to gas supplies and poor pressure reports, including water ingress, pipe failure, pipe blockage, human error, equipment failure, external damage
21. How to interpret building regulations and plans for domestic and small commercial properties including types of foundations, walls, floors, ceilings, roofs and other services entering properties
22. How and where to access and interpret normative documents, guidance documents, industry standards and company procedures for upstream gas emergency activities
23. Potential sources of ignition including street lighting, electric street signs, motor vehicles, balanced flue chimneys, electric switches, industrial process plant, mobile phones, overhead power lines, doorbells, entry systems
24. Key information to communicate with emergency dispatch control centre including to confirm job information on receipt of job, if unable to attend reported emergencies in sufficient time, to keep informed of situation on site and all ongoing information, both during and after location of gas emergencies 
25. Points in gas emergency activities where co- operation and liaison with emergency services, other trades and property occupiers may be required
26. The procedures, routines, sequences and work methods for exchanging emergency control valves (ECV’s)
27. How to record the results of testing activities and actions taken using company reporting systems and documentation, in accordance with statutory requirements for all upstream gas emergency activities
28. Tests, checks, appropriate test equipment and how to use it to confirm the suitability of gas combustion performance and operating pressure of gas systems and components
29. Industry practices, procedures and criteria for site handover and to establish and confirm that the site is safe to leave after the repair work has been carried out
30. The statutory requirements for recording the results of testing activities and actions taken and, using company reporting systems and documentation
31. Job management structures and methods of reporting and recording job progress or problems delaying 
32. How to safely collect and dispose of system contents that may be hazardous to health or the environment


Scope Performance

Scope Knowledge





Links To Other NOS

External Links

Version Number


Indicative Review Date

01 Mar 2026





Originating Organisation

Energy & Utility Skills

Original URN


Relevant Occupations

Gas Network Construction

SOC Code



minimise, risks, life, property, environment, emergency, gas, LPG, hydrogen, network, construction, operations, utility, utilities, gas emergencies, risk reduction