BS 6700:1987

Foreword
Committees responsible
Specification
Section one. General
1 Scope
2 Definitions
3 Materials
Section two. Design considerations
4 Initial procedures
5 Cold water services
6 Hot water services
7 Prevention of bursting
8 Pipe sizing
9 Preservation of water quality
10 Frost precautions
11 Accessibility of pipes and water fittings
12 Water economy and energy conservation
Section three. Installation
13 Work on site
14 Inspection, testing and commissioning of pipelines,
    services and installations
Section four. Maintenance
15 Maintenance
Appendices
A Legal requirements
B Noise and vibration
C Examples of pumped systems
D Guidance on the calculation of hot water storage
    capacity
E Pipe sizing calculation
F Jointing of potable water pipework
G Procedure for the detection of water leakages in
    metered water services
H Publications referred to in this standard or related
    to it
Tables
1 Recommended minimum storage of cold water for
    domestic purposes (hot and cold outlets)
2 British Standards for stopvalves
3 Recommended internal dimensions for meter chambers
4 Design flow rates
5 Maximum water velocities in pipework
6 Backflow prevention measures to be used with various
    types of water fittings and appliances
7 Air gaps at taps
8 Dimensions of type A air gap
9 Minimum thickness of thermal insulating material to
    delay freezing for frost protection
10 Examples of insulating materials
11 Maximum permissible lengths of uninsulated hot water
    pipes
12 Maximum permitted rates of heat loss from pipes
13 Jointing of light gauge copper and stainless steel
    tube
14 Thrust per bar internal pressure
15 Bearing capacity of soils
16 Method of branch pipe connection
17 Maximum spacing of fixings for internal piping
18 Case 1: minimum sizes of storage vessel
19 Case 2: minimum sizes of storage vessel
20 Loading units (hot or cold supply)
21 Equivalent pipe lengths (copper, plastics and
    stainless steel)
22 Typical loss of head through taps and equivalent
    pipe lengths
23 Hot and cold water supply supplied from storage
24 Hot and cold water supply direct off main service
25 Jointing of potable water pipework
Figures
1 Connections for meters outdoors
2 Proprietary meter yokes for meters outdoors
3 Meter installation indoors
4 Meter installation indoors using a proprietary meter
    yoke
5 Metre installation indoors in cupboard
6 Installation of water softeners
7 Choice of hot water system
8 Direct (vented) system
9 Indirect (vented) system
10 Indirect unvented (vented primary) system
11 Indirect unvented (sealed primary) system
12 Illustration of obstruction of inlet or feed pipe
13 Example of secondary backflow protection of supply
    pipes
14 Examples of secondary backflow protection of
    distributing pipes
15 Typical examples of pipes entering buildings
16 Accessibility of pipes
17 Clear space needed above storage cisterns
18 Directions of thrusts developed in a pipeline due to
    internal pressure
19 Recommended positions of notches and holes in timber
    beams and joists
20 Indirect boosting from break cistern to storage
    cistern
21 Indirect boosting with pressure vessel
22 Direct boosting
23 Direct boosting with header and duplicate storage
    cisterns
24 Conversion of loading units to design flow rate
25 Determination of pipe diameter: cold water service
    (water at 12.8 deg C)
26 Determination of pipe diameter: hot water service
    (water at 80 deg C)
27 Head loss through stopvalves
28 Head loss through float-operated valves
29 Example of pipe sizing for hot and cold water
    services, low pressure system
30 Example of pipe sizing for hot and cold water
    services, mains pressure system
31 Typical pipework network
Index

Covers the system of pipes, fittings and connected appliances installed to supply any building, whether domestic or not, with hot and cold water for ablutionary, cleaning, sanitary, culinary, drinking and domestic laundry purposes.