BS 6700:1997

Committees responsible
Foreword
Specification
Section 1. General
1.1 Scope
1.2 References
1.3 Definitions
1.4 Materials
Section 2. Design considerations
2.1 Initial procedures
2.2 Cold water services
2.3 Hot water services
2.4 Prevention of bursting
2.5 Pipesizing
2.6 Preservation of water quality
2.7 Maintenance of water temperature within the systems
2.8 Accessibility of pipes and water fittings
2.9 Water economy and energy conservation
Section 3. Installation
3.1 Work on site
Section 4. Maintenance
4.1 Maintenance procedures
4.2 General
4.3 Pipework
4.4 Terminal fittings, valves and meters
4.5 Cisterns
4.6 Ducts
4.7 Vessels under pressure
4.8 Disconnection of unused pipes and fittings
Annexes
A (informative) Legal issues
B (informative) Examples of pumped systems
C (informative) Guidance on the calculation of hot water
storage capacity
D (informative) Pipe sizing calculations
Tables
1 Recommended minimum storage of cold water for
      domestic purposes (hot and cold outlets)
2 British Standards for stopvalves
3 Design flow rates
4 Backflow prevention measures to be used with
      various types of water fittings and appliances
5 Air gaps at taps
6 Calculated minimum thickness of insulation to protect
      copper pipes fixed inside premises for domestic
      cold water systems
7 Calculated minimum thickness of insulation to
      protect copper pipes fixed inside premises against
      freezing for commercial and institutional applications
8 Examples of insulating materials
9 Maximum recommended lengths of uninsulated hot
      water pipes
10 Maximum permitted rates of energy loss from pipes
11 Jointing of light gauge copper and stainless steel
      tube
12 Thrust per bar internal pressure
13 Bearing capacity of soils
14 Maximum spacing of fixing for internal piping
C.1 Minimum sizes of storage vessel for case 1
C.2 Minimum sizes of storage vessel for case 2
D.1 Loading units (hot or cold supply)
D.2 Typical loss of pressure through UK low resistance
      taps and equivalent pipe lengths
D.3 Typical equivalent pipe lengths (copper, plastics
      and stainless steel)
D.4 Example of pipe sizing calculations for cold water
      services
D.5 Example of pipe sizing calculations for cold water
      services (mains supplied)
Figures
1 Example of pipework for installation of water
      softener
2 Example of external meter installation
3 Example of meter installation inside building
4 Choice of hot water system
5 Example of a direct (vented) system
6 Example of an indirect (vented) system
7 Example of an indirect unvented (vented primary)
      system
8 Example of an indirect unvented (sealed primary)
      system
9 Example of secondary backflow protection of supply
      pipes
10 Examples of secondary backflow protection of
      distributing pipes
11 Typical examples of pipes entering buildings
12 Accessibility of pipework
13 Clear space needed above storage systems
14 Directions of thrusts developed in a pipeline due
      to internal pressure
15 Recommended positions of notches and holes in
      timber beams and joists.
16 Pressure testing of elastomeric pipe systems;
      test procedure A
17 Testing of elastomeric pipe systems; test
      procedure B
B.1 Indirect boosting from break cistern to storage
      cistern
B.2 Indirect boosting with pressure vessel
B.3 Direct boosting
B.4 Direct boosting with header and duplicate storage
      cisterns
D.1 Conversion of loading units to design flow rate
D.2 Determination of pipe diameter: (water at 10 deg C)
D.3 Head loss through stopvalves
D.4 Head loss through float-operated valves
D.5 Example of pipe sizing for hot and cold water
      services, low pressure system
D.6 Example of pipe sizing for hot and cold water
      services, low pressure system
List of references

Combines requirements and recommendations for systems for pipes, fittings and connected appliances installed to supply buildings with water for drinking and other purposes.