Cold Water Systems revision notes
Direct and stored supplies, cistern storage, float-operated valves and protecting the supply from backflow.
- 12notes, free to read
- 121questions, free to try
- 5topics
G1: Cold Water Supply & Service Pipes
C&G Unit 204: Cistern Storage & Float Valves
Cold water: direct vs indirect distribution
How direct and indirect systems get cold water to each outlet.
Direct and indirect cold water systems
The difference between a direct and an indirect cold water system and why a property uses one or the other.
Sizing a cold water storage cistern (worked example)
A method for turning occupancy and a per-person allowance into a cistern capacity, with the arithmetic shown.
Unit 204: Cold water storage and float valves
Cistern storage, warnings, float valve types, and overflow pipe sizing.
G2: Water Efficiency & Hot Water Safety
C&G Unit 204: Pipe Materials, Isolation & Frost Protection
Cold pipe materials and frost protection
Common cold-water pipe materials, isolation, and why and where cold pipework must be protected from freezing.
Water content of a pipe run (worked example)
A worked calculation of how much water a length of pipe holds, useful for filling, flushing and dosing.
Water hammer: causes and cures
Why pipes bang when a valve shuts fast, and the practical ways to stop it.
C&G Unit 204: Stagnation, Storage Turnover & Legionella Basics
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