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Cold Water

Exam revision materials for Plumbing Level 2&3 and ACS Gas Safety test

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Water Mains

Main Pipe and Supply

MDPE Communication and Supply Pipes

  • Polyethylene Blue up to 63mm [BS 6572]
  • Polyethylene – for underground cold water pipes
  • PE Barrier Pipe (1 layer of metal + 2 layers of plastic) - supplies cald water to a 'brownfield site'

  • Goose Neckallows movement of a pipe
  • Water Meter
  • Supplier's External Stop Valve - located just before the boundary
< Go Back2013-03-02

Installation requirements

  • Made of PVC-U [BS 3505]
  • Pipes below ground SHOULD lay between 750-1350 mm or insulated
  • Pipes entering buildings through walls below ground should be in duct and sealed at both ends
  • For solid floors, if the pipe rises up inside the building less than 750mm from the outside wall, then vertical section must be insulated
  • For suspended floor the pipe should be always insulated in the floor void
  • A Main Stop Valve should be provided within 150mm of floor just insid the premises
  • A Drain Valve should be fitted just above the Main Stop Valve
  • 15mmMIN size of a cold water service pipe to a dwelling
< Go Back2013-03-02