ACS Tightness Testing & Purging 2

Question 1

What is the primary purpose of purging a gas installation?

Accepted Answer

To remove air and replace it with fuel gas

Answer

Purging displaces air (or inert gas) from the pipework and replaces it with fuel gas to allow appliances to operate safely and reliably.

Question 2

Which UK Gas Industry standard primarily covers tightness testing and purging of domestic natural gas installations?

Accepted Answer

IGEM/UP/1B

Answer

IGEM/UP/1B is the Gas Industry standard specifically covering tightness testing and purging of domestic-sized natural gas installations.

Question 3

When purging gas into a room, what is the essential safety requirement?

Accepted Answer

The room must be well ventilated with doors and windows open

Answer

The room must be well ventilated so that gas released during purging is sufficiently diluted to prevent the formation of an ignitable mixture.

Question 4

What must be confirmed before attempting to light an appliance after purging?

Accepted Answer

That gas is flowing freely and consistently at the appliance burner

Answer

Gas must be flowing freely at the burner before ignition is attempted to ensure successful and safe lighting of the appliance.

Question 5

If a gas supply has been interrupted and then restored, in what order should appliances be purged and re-lit?

Accepted Answer

One appliance at a time, starting with the one nearest the meter

Answer

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.

Gas Safe ACS Practice Test