L2 CW Systems

What are the two key tests that you would do on a cold water system?

• Temperature & Flow rate

• Temperature and Pressure

• Pressure and Temperature

• Pressure and Flow rate

What type of system would be under high pressure?

• Direct

• Indirect

Figure 1 shows a DIRECT cold water system, including CWSC.

a

b

c

22mm Overflow

22mm Cold Feed

15mm Rising Main

Identify one advantage of a DIRECT cold water system.

• Larger pipe sizes installed.

• Potable water available at all outlets.

• Reserve water supply.

• Not affected by peak pressure drops.

Identify one disadvantage of a DIRECT cold water system.

• Higher pipe sizing.

• Cistern in loft may freeze

• Pressure may drop during peak demand.

• No potable water at outlets.

Identify one advantage of an INDIRECT system.

• Reserve water supply.

• Smaller pipe sizes.

• Less risk of freezing.

• Wholesome water available at all outlets.

Identify one disadvantage of an INDIRECT system.

• Increased costs due to pipework and sizing.

• Increased water noise

• Increased pressure

• Pressure may drop during peak demand.

Figure 3 shows an indirect cold water system.
Identify the pipe name and minimum sizes in the boxes.

a

c

d

22mm distribution pipe

15mm distribution pipe.

15mm distribution at appliance

15mm Rising main

22mm Rising main