This presentation explains the pipe systems in proper manner and it is simple english.

1. Er.Gokul.A,
Civil 3rd year ‘B’ sec
Periyar Maniammai University,
Vallam.

2.  One Pipe Line System
 Two Pipe Line System
 Single stack pipe line System
 Partially Single stack pipe System

4.  In the system all soil and waste water discharge into
one common pipe and all branch ventilating pipes into
one main pipe.
 This system largely replaces the two pipe system and
lent itself very well to use in multistorey
developments.
 It is far more economical than the two pipe system.

5. Advantages.
 Largely replaced two pipe system in most developed
countries.
 Fast becoming preferred system in other parts of the world.
 High quality pipes, fittings and installation techniques
available these days.
 Constant flow of water ensures reduction in blockage
problem.
 Eliminated gully traps. Thus precludes the need to clean
them.
 Highly economical in terms of cost.
 Quick to construct and commission.
Disadvantages.
 Danger of back flow of sewage in waste fittings.

7.  The Soil stack receives the discharge from soil
appliances and delivered it direct to the underground
drainage system
 The waste and soil water did not combine until they
reached the below ground drainage system.

8. Advantages
 Ensure segregation of foul sewage from waste
water.
 No danger of backflow of sewage in waste fittings
incase of blockage of soil pipe.
 Enables use of waste water directly for
irrigation/gardening.
 Separate waste water stack permits arrest of
solids from kitchen in the gully trap thus
preventing the from entering sewer. Gully traps
needs to be cleaned periodically.

9. Disadvantages
 Difficult to install in high rise buildings where stacks
terminate in service floor or in the ceiling of the
basement.
 Long horizontal runs to reach external walls /external
sewers.
 Provision of gully trap difficult to implement in above
situation.
 Require more shaft/duct space.

11.  Only one pipe system without providing any separate
ventilation pipe.
 It carries both sewage and sullage water
 There is no vent pipe
 It extended upto 2m to 3m higher than the roof level
and provided with cowl for foul gases.

13.  This system uses 2 single stack pipes, one for waste and
the others is for soil.
 Both of the single stack pipes have individual
ventilation system.
 The waste discharge pipe drains waste water from the
shower tray and bath tub.
 The soil discharge pipe drains soil water from the WC
and urinal.
 The single stack pipe is then connected to the
underground drainage pipe.