WIS 4-21-02 Issue 1 October 1994 Specification for mechanical couplings and repair clamps for iron pipes for the conveyance of cold potable water (underground use) for the size range 40 to 1600mm / 1.5 to 48″ inclusive | Water UK Standards Board

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WIS 4-21-02 Issue 1 October 1994 Specification for mechanical couplings and repair clamps for iron pipes for the conveyance of cold potable water (underground use) for the size range 40 to 1600mm / 1.5 to 48″ inclusive

Issue: October 1994 Code: 4-21-02 Status: Archived

IGN 4-22-01 Issue 1 August 1985 Specification for compression fittings of copper and copper alloy for polyethylene pipes with outside diameters to BS 5556 (metric)

Issue: August 1985 Code: 4-22-01 Status: Archived

WIS 4-22-02 Issue 1 March 1991 Specification for ferrules (tapping tees) and ferrule straps for underground use

Issue: March 1991 Code: 4-22-02 Status: Ageing

IGN 4-23-01 Issue 1 January 1987 Selection, installation, operation and maintenance of isolating and boundary valves used in water distribution systems

Issue: January 1987 Code: 4-23-01 Status: Archived

WIS 4-23-04 Issue 1 March 1991 Specification for underground stop valves, including spherical valves, for potable water services for nominal sizes up to and including 63 and nominal pressures of 10 bar minimum and made principally of metal or thermoplastics

Issue: March 1991 Code: 4-23-04 Status: Ageing

WIS 4-24-01 Issue 2 July 1998 Specification for mechanical fittings and joints for polyethylene pipes for nominal sizes 90 to 1000

Issue: July 1998 Code: 4-24-01 Status: Archived

WIS 4-24-01 April 1991 Issue 1 Specification for mechanical fittings and joints including flanges for polyethylene pipes for the conveyance of cold potable water for the size range 90 to 1000 inclusive made of metal or plastics or a combination of both

Issue: April 1991 Code: 4-24-01 Status: Archived

WIS 4-24-01A April 1991 Issue 1 Amendment 1 August 1995 Specification for mechanical fittings and joints including flanges for polyethylene pipes for the conveyance of cold potable water for the size range 90 to 1000 inclusive made of metal or plastics or a combination of both

Issue: August 1995 Code: 4-24-01A Status: Archived

WIS 4-25-01 Issue 1 October 1999 Specification for the use of steel tanks in the water industry

Issue: October 1999 Code: 4-25-01 Status: Ageing

IGN 4-25-02 Issue 1 January 1999 Applications for stainless steel in the water industry

Issue: January 1999 Code: 4-25-02 Status: Archived