BS CP342-2(1974) : 1974

0. INTRODUCTION
1. GENERAL
1.1 Scope
1.2 Definitions
1.3 Exchange of information
1.4 Programming
2. MATERIALS, APPLIANCES AND COMPONENTS
2.1 British Standards
2.2 Boilers
2.3 Combined boiler and cylinder units
2.4 Materials for boilers, and internal treatment
2.5 Boiler mountings
2.6 Flue pipes
2.7 Tools for cleaning and maintaining boilers
2.8 Calorifiers
2.9 Calorifier mountings
2.10 Hot water storage vessels
2.11 Hot water storage vessel mountings
2.12 Cold water feed cisterns
2.13 Pipes and pipe fittings
2.14 Electric immersion heating elements
2.15 Valves
2.16 Taps
2.17 Towel rails
2.18 Electrically driven circulating pumps
2.19 Thermal insulation
3. DESIGN
3.1 General
3.2 Temperatures
3.3 Consumption and storage
3.4 Particular requirements for individual dwellings
3.5 Character of water
3.6 Standby plant
3.7 Sump pumps
3.8 Boilers
3.9 Boiler siting
3.10 Chimneys and flue pipes
3.11 Hot water storage vessels, including storage
      calorifiers or indirect cylinders
3.12 Siting of hot water storage vessels
3.13 Safety and fire precautions
3.14 Pipework
3.15 Discharge rates and probable demand
3.16 Pipe sizing data
3.17 Primary circuits
3.18 Secondary circuits
3.19 Draw-off pipes
3.20 Cold feed pipe
3.21 Open vent pipe
3.22 Automatic air eliminators and air bottles
3.23 Draining
3.24 Electrically driven circulating pumps
3.25 Extent of insulation work to be undertaken
3.26 Mixing valves
3.27 Spary taps
3.28 Prefabrication
4. WORK ON SITE
4.1 Cleanliness of installation
4.2 Boiler bases
4.3 Boiler installation
4.4 Flue pipe
4.5 Storage vessel supports
4.6 Pipework fixings, supports etc.
4.7 Pipe fixings, supports etc.
4.8 Vent pipes and venting generally
4.9 Draining of system
4.10 Joints of galvanized pipes and fittings
4.11 Joints for copper pipes and fittings
4.12 Joints for stainless steel pipes
4.13 Lead joints to copper and iron
4.14 Location of valves
4.15 Identification of pipes
4.16 Circulating pumps
4.17 Thermal insulation
5. INSPECTION, TESTING AND COMMISSIONING
5.1 Tests off site
5.2 Cleaning and filling
5.3 Tests on site
5.4 Commissioning
6. MAINTENANCE
6.1 General
6.2 Planned maintenance
TABLES
1. Maximum permissible lengths of dead legs
2. Recommended rates of discharge
3. Sizes of open vent pipes
4. Intervals between pipe supports

Provides guidance on the designing, planning, installation, inspection and testing of systems of hot water supply in commercial, industrial or multiple dwelling buildings supplied from a central source, including district or group schemes. Excludes installation work required for the supply of steam or high pressure hot water to calorifiers. Non-storage hot water supply appliances are also omitted. Covers definitions, exchange of information, programming, materials, appliances and components, work on site and maintenance.