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

To increase the operating pressure in the pipework

Answer

To clean debris from the internal pipework surfaces

Answer

To test the pressure integrity of the installation

Question 2

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

Accepted Answer

IGEM/UP/1B

Answer

IGE/UP/2

Answer

BS 6891

Answer

COSHH Regulations 2002

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 completely sealed to contain the gas

Answer

All ignition sources must be active to burn off the gas immediately

Answer

Purging into a room is never permitted under any circumstances

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

That the gas meter has recorded consumption during the purging process

Answer

That the smell of gas has completely disappeared from the room

Answer

That at least 30 minutes have passed since purging was completed

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

Largest appliances first, then progressively smaller ones

Answer

All appliances simultaneously to minimise purging time

Answer

Any order, as the gas pressure equalises automatically throughout the system

Question 6

What action should be taken if a new installation fails a tightness test before purging?

Accepted Answer

Locate and repair the fault before any further testing or purging

Answer

Proceed with purging and retest the installation afterwards

Answer

Report the failure to the gas transporter and leave the site

Answer

Increase the test pressure and repeat the tightness test immediately

Question 7

When purging through an appliance burner rather than a dedicated purge point, what must the gas engineer ensure first?

Accepted Answer

The appliance burner tap is open and the appliance is ready for ignition

Answer

The appliance isolation valve is closed and the burner tap is open

Answer

All other appliances in the property are also being purged at the same time

Answer

The appliance has been fully disconnected from the gas supply during purging