EUSDSG3.6 Carry out gas tightness testing and direct purging in small settings
Overview
This standard is about carrying out gas tightness testing and direct purging on gas installations in small (including domestic) settings. Small settings refers to natural gas systems and components downstream of an emergency control valve (ECV). They will have:
a maximum operating pressure (MOP) at the outlet of the ECV not exceeding 2bar (or 4bar in Northern Ireland),
an operating pressure (OP) at the outlet of the primary meter of 21mbar (nominal),
a nominal bore of not greater than 35mm,
a maximum rated capacity through the primary meter of 16m3/h (U16),
a maximum installation volume (IV) supplying an individual dwelling or non domestic premises of 0.035m3
It can apply to any type of fuel gas or combinations of fuel gas.
This standard is for gas engineers who work in small settings and for emergency first responders.
Performance criteria
You must be able to:
Confirm the entire pipework installation complies with the manufacturers’ specification and industry standards
Check that conditions within gas systems will permit safe tightness testing and direct purging
Use the correct tools and equipment for tightness testing and direct purging activities
Measure, calculate and record gas system installation volumes for tightness testing and direct purging activities
Ensure ventilation for tightness testing and direct purging activities meet industry standards’ requirements
Ensure existing gas systems are clean and free of debris
Minimise damage to customer property and building features during tightness testing and direct purging processes
Use tightness testing procedures to confirm the integrity of systems to industry standards
Use purging procedures to confirm the safe supply of gas to installed gas system and appliances
Resolve problems in accordance with approved procedures during tightness testing and direct purging activities
Instruct the property occupier on the correct operation of the gas system, valves and components and provide them with their copy of the any literature
Use designated safe isolation procedures and warning notices to prevent the unauthorised use of un-commissioned or de-commissioned gas appliances, gas systems, electrical systems and components
Liaise with the property occupier and other people who will be affected by the work to minimise disturbance to the job
Advise of any delays to the work, unsafe situations and required remedial actions to those who require the information
Check that the customer is satisfied with the finished job
Complete required records and documentation
Knowledge and understanding
You need to know and understand:
Regulations and guidance governing health and safety in the workplace, environmental protection and the use of risk assessments
Legislation covering your general responsibilities for your own safety and that of others
The limits of your own autonomy and responsibility
Gas industry unsafe situations procedures and how to isolate unsafe gas appliances, gas systems and components
Potential hazards that could arise from all gas tightness testing and direct purging activities and checks to be carried out before work takes place
How to access and interpret normative documents, guidance documents, manufacturers’ instructions, industry standards, safety schemes and regulations
Industry practices, work standards routines and sequences for gas tightness testing and direct purging
How to measure, calculate and record gas system installation volumes for tightness testing and direct purging activities
The tools, equipment, materials and components required for gas tightness testing and direct purging and how to secure and store them
The test equipment and legislative requirements for applying tightness testing to gas systems, appliances and components
Safe isolation methods, tests, and procedures for temporary and permanent de-commissioning of gas and electricity systems, components and appliances including use of temporary continuity bonds, voltage sticks, voltage indicators, proving units, multimeters
Tightness testing procedures to confirm the integrity of newly installed gas system and, where applicable, new and existing appliances
Tightness testing procedures to confirm the integrity of the existing installed gas system and, where applicable, new and existing appliances to ensure the installation doesn’t exceed the maximum permissible pressure drop
How to recognise medium pressure regulator sets where the maximum operating pressure (MOP) at the outlet of the emergency control valve (ECV) is above 75mbar but not exceeding 2bar (4bar in Northern Ireland) and, whether a meter inlet valve (MIV) is fitted
Tightness testing procedures to confirm the integrity of gas systems where the maximum operating pressure (MOP) at the outlet of the emergency control valve (ECV) is above 75mbar but not exceeding 2bar (4bar in Northern Ireland) including when a meter inlet valve (MIV) is or is not fitted
Industry practices and procedures for tracing and repairing gas escapes
Process and procedures, equipment and legislative requirements for applying direct purging of gas systems, appliances and components
Routines and sequences for direct purging of gas systems, appliances and components
Measures to prevent un-commissioned gas systems being brought into operation utilising safety and warning notices
Required records and documentation confirming safe tightness testing and direct purging of gas systems
The system handover procedures and how to demonstrate the operation of gas systems and components to end users
Approved procedures for resolving problems during tightness testing and direct purging activities including system or component defects, systems and components do not meet design requirements and systems and components cannot be restored to full performance
Job management structures and methods of reporting and recording job progress or problems delaying progress
How to safely collect and dispose of system contents that may be hazardous to health or the environments
How to isolate unsafe gas appliances, gas systems and components and application of the gas industry unsafe situations procedure
EUSDSG3.6 Carry out gas tightness testing and direct purging in small settings
Overview
This standard is about carrying out gas tightness testing and direct purging on gas installations in small (including domestic) settings. Small settings refers to natural gas systems and components downstream of an emergency control valve (ECV). They will have:
It can apply to any type of fuel gas or combinations of fuel gas.
This standard is for gas engineers who work in small settings and for emergency first responders.
Performance criteria
You must be able to:
Knowledge and understanding
You need to know and understand: