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BS 6700:1997

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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Specification for design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages

Available format(s)

Hardcopy , PDF

Superseded date

29-12-2006

Language(s)

English

Published date

15-04-1997

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.

Committee
B/504
DevelopmentNote
Supersedes 94/109858 DC and BS 6700(1987) (09/2005)
DocumentType
Standard
Pages
98
PublisherName
British Standards Institution
Status
Superseded
SupersededBy
Supersedes

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BS 6465-3:2006 Sanitary installations Code of practice for the selection, installation and maintenance of sanitary and associated appliances
BS 5482-1:2005 Code of practice for domestic butane- and propane-gas-burning installations Installations at permanent dwellings, residential park homes and commercial premises, with installation pipework sizes not exceeding DN 25 for steel and DN 28 for corrugated stainless steel or copper
BS 9251:2005 Sprinkler systems for residential and domestic occupancies. Code of practice
BS 5871-2:2005 Specification for the installation and maintenance of gas fires, convector heaters, fire/back boilers and decorative fuel effect gas appliances Inset live fuel effect gas fires of heat input not exceeding 15 kW, and fire/back boilers (2nd and 3rd family gases)
BS 6767-2:1998 Transportable accommodation units Recommendations for design and installation of services and fittings with guidance on transportation, siting and aspects relating to habitation
BS 5306-2:1990 Fire extinguishing installations and equipment on premises Specification for sprinkler systems
BS 5546:2000 Specification for installation of hot water supplies for domestic purposes, using gas-fired appliances of rated input not exceeding 70 kW
BS 5502-81:1989 Buildings and structures for agriculture Code of practice for design and construction of chemical stores
BS 8000-15:1990 Workmanship on building sites Code of practice for hot and cold water services (domestic scale)
BS 6644(2005) : 2005 SPECIFICATION FOR INSTALLATION OF GAS-FIRED HOT WATER BOILERS OF RATED INPUTS BETWEEN 70 KW (NET) AND 1.8 MW (NET) (2ND AND 3RD FAMILY GASES)
BS 3445-2:1992 Agricultural water troughs and water fittings Code of practice for installation and operation
BS 8204-7:2003 Screeds, bases and in-situ floorings Pumpable self-smoothing screeds. Code of practice
BS 5502-25:1991 Buildings and structures for agriculture Code of practice for design and installation of services and facilities
BS 5449:1990 Specification for forced circulation hot water central heating systems for domestic premises
BS 5871-1:2005 Specification for the installation and maintenance of gas fires, convector heaters, fire/back boilers and decorative fuel effect gas appliances Gas fires, convector heaters, fire/back boilers and heating stoves (2nd and 3rd family gases)
BS 6798:2000 Specification for installation of gas-fired boilers of rated input not exceeding 70 kW net
BS 5258-15:1990 Safety of domestic gas appliances Specification for combination boilers
BS 3445-1:1992 Agricultural water troughs and water fittings Specification for water trough bodies, service boxes and water supply system
BS 3632:2005 Residential park homes. Specification
BS 5871-1:2001 Specification for installation of gas fires, convector heaters, fire/back boilers and decorative fuel effect gas appliances Gas fires, convector heaters, fire/back boilers and heating stoves (1st, 2nd and 3rd family gases)

BS CP312-1(1973) : 1973 CODE OF PRACTICE FOR PLASTICS PIPEWORK (THERMOPLASTICS MATERIAL) - GENERAL PRINCIPLES AND CHOICE OF MATERIAL
BS 5493:1977 Code of practice for protective coating of iron and steel structures against corrosion
BS EN 200:2008 Sanitary tapware. Single taps and combination taps for water supply systems of type 1 and type 2. General technical specification
BS 5615:1985 Specification for insulating jackets for domestic hot water storage cylinders
BS 5386-1:1976 Specification for gas burning appliances Gas burning appliances for instantaneous production of hot water for domestic use
BS 1566-2:1984 Copper indirect cylinders for domestic purposes Specification for single feed indirect cylinders
BS 6282-1:1982 Devices with moving parts for the prevention of contamination of water by backflow Specification for check valves of nominal size up to and including DN 54
BS 3955:1986 Specification for electrical controls for household and similar general purposes
BS 5258-8:1980 Safety of domestic gas appliances Combined appliances: gas fire/back boiler
BS 1710:1984 Specification for identification of pipelines and services
BS 4991:1974 Specification for propylene copolymer pressure pipe
BS 2456:1990 Specification for floats (plastics) for float operated valves for cold water services
BS 3456-2.21:1972 Specification for safety of household and similar electrical appliances. Particular requirements Electric immersion heaters
BS 5728-1:1979 Measurement of flow of cold potable water in closed conduits Specification for single meters
BS 3377:1985 Specification for boilers for use with domestic solid mineral fuel appliances
BS CP312-3(1973) : 1973 CODE OF PRACTICE FOR PLASTICS PIPEWORK (THERMOPLASTICS MATERIAL) - POLYETHYLENE PIPES FOR THE CONVEYANCE OF LIQUIDS UNDER PRESSURE
BS 4876:1984 Specification for performance requirements for domestic flued oil burning appliances (including test procedures)
BS 6730:1986 Specification for black polyethylene pipes up to nominal size 63 for above ground use for cold potable water
BS EN 257:2010 Mechanical thermostats for gas-burning appliances
BS 1252:1991 Specification for domestic solid mineral fuel-fired, free-standing cookers with or without boilers
BS 5386-2:1981 Specification for gas burning appliances Mini water heaters (2nd and 3rd family gases)
BS 6437:1984 Specification for polyethylene pipes (type 50) in metric diameters for general purposes
BS 7671:1992 REQUIREMENTS FOR ELECTRICAL INSTALLATIONS
BS 6920-3:1990 Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the quality of the water High temperature tests
BS EN 60335-2-21 : 2003 HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES - SAFETY - PART 2-21: PARTICULAR REQUIREMENTS FOR STORAGE WATER HEATERS
BS 2871-1:1971 Specification for copper and copper alloys. Tubes Copper tubes for water, gas and sanitation
BS 699:1984 Specification for copper direct cylinders for domestic purposes
BS 6798:1987 Specification for installation of gas-fired hot water boilers of rated input not exceeding 60 kW
BS 6281-3:1982 Devices without moving parts for the prevention of contamination of water by backflow Specification for pipe interrupters of nominal size up to and including DN 42
BS 1968:1953 Specification for floats for ballvalves (copper)
BS 6340-4:1984 Shower units Specification for shower heads and related equipment
BS 1212-2:1990 Float operated valves Specification for diaphragm type float operated valves (copper alloy body) (excluding floats)
BS 5871-1:1991 Specification for installation of gas fires, convector heaters, fire/back boilers and decorative fuel effect gas appliances Gas fires, convector heaters and fire/back boilers (1st, 2nd and 3rd family gases)
BS 7291-3:1990 Thermoplastics pipes and associated fittings for hot and cold water for domestic purposes and heating installations in buildings Specification for crosslinked polyethylene (PE-X) pipes and associated fittings
BS 4433-1:1994 Domestic solid mineral fuel fired boilers with rated output up to 45 kW Domestic solid mineral fuel fired boilers with rated output up to 45 kw. Specification for boilers with undergrate ash removal
BS 4346-1:1969 Joints and fittings for use with unplasticized PVC pressure pipes Injection moulded unplasticized PVC fittings for solvent welding for use with pressure pipes, including potable water supply
BS EN 969:2009 Ductile iron pipes, fittings, accessories and their joints for gas pipelines. Requirements and test methods
BS 3456-102.21:1988 Specification for safety of household and similar electrical appliances. Particular requirements Storage water heaters
BS 2580:1979 Specification for underground plug cocks for cold water services
BS 5546:1990 Specification for installation of gas hot water supplies for domestic purposes (1st, 2nd and 3rd family gases)
BS 7430:1991 Code of practice for earthing
BS 6282-3:1982 Devices with moving parts for the prevention of contamination of water by backflow Specification for in-line anti-vacuum valves of nominal size up to and including DN 42
BS 6282-4:1982 Devices with moving parts for the prevention of contamination of water by backflow Specification for combined check and anti-vacuum valves of nominal size up to and including DN 42
BS 1387:1985 Specification for screwed and socketed steel tubes and tubulars and for plain end steel tubes suitable for welding or for screwing to BS 21 pipe threads
BS 3198:1981 Specification for copper hot water storage combination units for domestic purposes
BS 5386-5:1988 Specification for gas burning appliances Specification for gas burning instantaneous water heaters with automatic output variation (2nd and 3rd family gases)
BS 7766:1994 Specification for assessment of the potential for metallic materials to affect adversely the quality of water intended for human consumption
BS CP312-2(1973) : 1973 AMD 2337 CODE OF PRACTICE FOR PLASTICS PIPEWORK (THERMOPLASTICS MATERIAL) - UNPLASTICIZED PVC PIPEWORK FOR THE CONVEYANCE OF LIQUIDS UNDER PRESSURE
BS 5433:1976 Specification for underground stopvalves for water services
BS 1566-1:1984 Copper indirect cylinders for domestic purposes Specification for double feed indirect cylinders
BS EN 598 : 2007 DUCTILE IRON PIPES, FITTINGS, ACCESSORIES AND THEIR JOINTS FOR SEWERAGE APPLICATIONS - REQUIREMENTS AND TEST METHODS
BS 6351-1:1983 Electric surface heating Specification for electric surface heating devices
BS 6572:1985 Specification for blue polyethylene pipes up to nominal size 63 for below ground use for potable water
BS 5258-15:1990 Safety of domestic gas appliances Specification for combination boilers
BS 6280:1982 Method of vacuum (backsiphonage) test for water-using appliances
BS 7291-2:1990 Thermoplastics pipes and associated fittings for hot and cold water for domestic purposes and heating installations in buildings Specification for polybutylene (PB) pipes and associated fittings
BS 5449:1990 Specification for forced circulation hot water central heating systems for domestic premises
BS EN 60335-2-35:2016 Household and similar electrical appliances. Safety Particular requirements for instantaneous water heaters
BS CP342-2(1974) : 1974 CODE OF PRACTICE FOR CENTRALIZED HOT WATER SUPPLY - BUILDINGS OTHER THAN INDIVIDUAL DWELLINGS
BS 5422:1990 Method for specifying thermal insulating materials on pipes, ductwork and equipment (in the temperature range -40°C to +700°C)
BS 6281-2:1982 Devices without moving parts for the prevention of contamination of water by backflow Specification for type B air gaps
BS 7206:1990 Specification for unvented hot water storage units and packages
BS 7291-4:1990 Thermoplastics pipes and associated fittings for hot and cold water for domestic purposes and heating installations in buildings Specification for chlorinated polyvinyl chloride (PVC-C) pipes and associated fittings and solvent cement
BS EN 625:1996 Gas-fired central heating boilers. Specific requirements for the domestic hot water operation of combination boilers of nominal heat input not exceeding 70 kW
BS 5834-2:1983 Surface boxes, guards and underground chambers for gas and waterworks purposes Specification for small surface boxes
BS 5114:1975 Specification for performance requirements for joints and compression fittings for use with polyethylene pipes
BS 5412:1996 Specification for low-resistance single taps and combination tap assemblies (nominal size ½ and ¾) suitable for operation at PN 10 max. and a minimum flow pressure of 0.01 MPa (0.1 bar)
BS EN 297:1994 Gas-fired central heating boilers. Type B<sub>11</sub> and B<sub>11BS</sub> boilers fitted with atmospheric burners of nominal heat input not exceeding 70 kW
BS 1010-2:1973 Specification for draw-off taps and stopvalves for water services (screw-down pattern) Draw-off taps and above-ground stopvalves
BS 6282-2:1982 Devices with moving parts for the prevention of contamination of water by backflow Specification for terminal anti-vacuum valves of nominal size up to and including DN 54
BS EN 545:2010 Ductile iron pipes, fittings, accessories and their joints for water pipelines. Requirements and test methods
BS 6956-5:1992 Jointing materials and compounds Specification for jointing compounds for use with water, low pressure saturated steam, 1st family gases (excluding coal gas) and 2nd family gases
BS 6465-1:1994 Sanitary installations Code of practice for scale of provision, selection and installation of sanitary appliances
BS 7291-1:1990 Thermoplastics pipes and associated fittings for hot and cold water for domestic purposes and heating installations in buildings General requirements
BS 534:1990 Specification for steel pipes, joints and specials for water and sewage

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