Pre-ISA test

Describe the checks you would carry out before tightness testing a gas system.

What is the minimum purge volume for a gas system connected to a metric meter?

You arrive at a job and suspect the system may be too large for you to work on.  What is the max system volume you are able to allowed to work on?

You encounter a system consisting of the following:

U16 gas meter
4m of 28mm copper
4m of 22mm copper
2m of 15mm copper
What is the volume of this system?

What is the purge volume for the system in question 4?

Which purge method would you use for the system in question 4?

• Method 1

• Method 2

What are your first thoughts about this installation?

A gas cooker is missing one of it's feet and is very unstable, how would categorise this?

A open flued boiler is installed in a compartment. What are the ventilation requirements if the compartment is ventilated direct to outside? 

How much free air space does this air vent provide in CM²?