Tightness Testing & Purging Flashcards
7 cards from real ACS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Tightness Testing & Purging flashcards as text
What is the primary purpose of purging a gas installation?
Answer: To remove air and replace it with fuel gas
Purging displaces air (or inert gas) from the pipework and replaces it with fuel gas to allow appliances to operate safely and reliably.
Which UK Gas Industry standard primarily covers tightness testing and purging of domestic natural gas installations?
Answer: IGEM/UP/1B
IGEM/UP/1B is the Gas Industry standard specifically covering tightness testing and purging of domestic-sized natural gas installations.
When purging gas into a room, what is the essential safety requirement?
Answer: The room must be well ventilated with doors and windows open
The room must be well ventilated so that gas released during purging is sufficiently diluted to prevent the formation of an ignitable mixture.
What must be confirmed before attempting to light an appliance after purging?
Answer: That gas is flowing freely and consistently at the appliance burner
Gas must be flowing freely at the burner before ignition is attempted to ensure successful and safe lighting of the appliance.
If a gas supply has been interrupted and then restored, in what order should appliances be purged and re-lit?
Answer: One appliance at a time, starting with the one nearest the meter
Appliances should be purged and re-lit one at a time, starting with the appliance nearest the meter, to ensure a controlled and safe purging process.
What action should be taken if a new installation fails a tightness test before purging?
Answer: Locate and repair the fault before any further testing or purging
Any fault must be located and repaired before proceeding, as introducing gas into a leaking system would create an immediately dangerous situation.
When purging through an appliance burner rather than a dedicated purge point, what must the gas engineer ensure first?
Answer: The appliance burner tap is open and the appliance is ready for ignition
The burner tap must be open so gas can flow through and displace the air within the appliance, ready for immediate ignition once purging is complete.