PIPING SYSTEM FOR SOIL AND WASTE DRAINAGE

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  • The Piping system to be adopted will depend on the type and planning of the building in which it is to be installed and will be one of the following.
  1. Single stack system
  2. One pipe (Partially ventilated system)
  3. One pipe (Fully ventilated system)
  4. Two pipe system

1) Single stack system

SINGLE STACK SYSTEM
  • The piping system in which there is no trap ventilation and the stack itself acts as vent through roof.
  • In this system care shall be taken for proper sizing of the pipes and the trap arm distance, specially the horizontal distance of sanitary fixtures from the drainage stack and vertical distance between connection of branches from fixtures to drainage stack.

2) One pipe (Partially ventilated system)

ONE PIPE PARTIALLY VENTILATED SYSTEM
  • The piping system in which soil and waste pipes are connected to a single vertical stack [ as explained in Single stack system ] with additional vent pipe for ventilation of traps of water closets.
  • It is also sometimes known as single stack partially ventilated system.

3) One pipe (Fully ventilated system)

ONE PIPE FULLY VENTILATED SYSTEM
  • The piping system in which the waste pipes from the sinks, baths and wash basins, and the soil pipe from water closet are connected to a single vertical stack.
  • The traps of the water closets, waste appliances, etc, are individually ventilated and connected with a separate stack to preserve the water seal.
  • It is also sometimes known as single stack fully ventilated system.

4) Two pipe system

i) Two pipe system with common vent pipe

TWO PIPE SYSTEM WITH COMMON VENT PIPE
  • The piping system in which all soil appliances such as water closets, urinals, bidet and bedpan sinks are connected to soil stack and all other plumbing fixtures such as baths, sinks, and basins are connected to waste stack through deep seal trap.
  • In addition, a common vent stack is provided for ventilation of soil and waste stacks.

ii) Two pipe system with independent vent pipes

TWO PIPE SYSTEM WITH INDEPENDENT VENT PIPES
  • The piping system in which all soil appliances such as water closets, urinals , bidet and bedpan sinks are connected to soil stack, and all other plumbing fixtures such as baths, sinks, and basins are connected to waste stack through deep seal trap.
  • In addition, there are independent a vent stacks provided for respective ventilation of soil and waste stacks.

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