ACS Pipework & Meters

Question 1

What colour is the MDPE (medium density polyethylene) gas service pipe used underground in Great Britain?

Accepted Answer

Yellow

Answer

Black

Answer

Blue

Answer

Orange

Question 2

What is the function of the Emergency Control Valve (ECV) on a gas installation?

Accepted Answer

To isolate the entire gas supply to a property in an emergency, located immediately upstream of or adjacent to the gas meter

Answer

To regulate gas pressure at the meter

Answer

To control the gas flow to individual appliances

Answer

To reduce the gas supply to a safe pressure from the mains

Question 3

Which type of fitting is used to join copper gas pipework in domestic installations and does NOT require soldering?

Accepted Answer

Compression fittings or press-fit fittings

Answer

Solder-ring fittings

Answer

Brazed fittings

Answer

Welded couplings

Question 4

What is the purpose of a gas meter index reading?

Accepted Answer

To record the volume of gas consumed at the premises, forming the basis of the customer's gas bill

Answer

To verify that the gas pressure is correct

Answer

To measure the efficiency of the gas appliance

Answer

To confirm the meter is correctly calibrated by the engineer

Question 5

What does 'pipe sizing' involve when designing a domestic gas installation?

Accepted Answer

Calculating the correct pipe diameter to supply the required gas flow rate to all appliances simultaneously without excessive pressure drop

Answer

Selecting the correct colour of pipe to use in each location

Answer

Measuring the length of pipe needed for ordering purposes only

Answer

Selecting pipe based on the age of the property

Question 6

What does the term 'standing pressure' mean in gas supply measurement?

Accepted Answer

The gas pressure measured at a test point with no appliances operating (static condition)

Answer

The pressure measured when all appliances are running at maximum demand

Answer

The pressure required to lift the gas from the main to the meter

Answer

The pressure at which the safety valve opens