This presentation will make you understand the basics of various types of the traps used in plumbing, it's location and the importance.

1. Mr. Mota Manoj H.
(Assistant professor, SITCOE)
Mr.Kate Ganesh
(Assistant professor, ADCET)

2.  Sewage is waste water which itself produces foul gases.
The gases include methane, carbon monoxides and
sulphide, which are unsafe to health and sometimes fatal.
We cannot stop the process of producing the foul gases
from the waste, but we can definitely stop the entry of
such gases into the house. Sewer gases sometimes prove
fatal and can bring minor illness.

3.  The trap can be defined as fittings at the end of soil pipes
or waste pipes to stop foul gases (odour) coming out of
these soil pipe or waste pipe. It means, it maintains the
water seal inside it and block the entering passage of foul
or unhealthy gases.

4.  A trap is a device shaped with a bending pipe path to
retain fluid to prevent sewer gases from entering buildings
while allowing waste materials to pass through. In
domestic applications, traps are typically P, Q or S-
shaped pipe located below or within a plumbing fixture. P,
Q, and S traps are classified according to their shape.

5.  Water seal is a designed water barrier that is
provided in the trap to prevent the air from passing
out of the waste pipe and into the room. i.e. it keeps
few inches of water between house air and sewer air

7. Floor Trap or Nahni Trap
 Floor trap or Nahni trap is provided in to the floor to
collect waste water from bathroom, wash area, washbasin,
and kitchen sink area etc.
 It is normally made in 80 mm diameter and the depth of
water seal mm provided is about 50.

8. Bottle Trap
 A bottle trap is provided to receive waste from
washbasin, kitchen sinks and other appliances
where the appliances do not have a built-in trap.

9. Gully Trap:
A gully trap is a basin in the ground which receives piped
wastewater from inside your home before it is emptied into
the wastewater network.
A gully trap is provided outside the building before connecting
it to external sewerage line. It also collects waste water from
the kitchen sink, wash basins, bath and wash area. The basin
has a water seal to prevent foul odours of the sewer reaching
the surface, and a vent pipe that allows fresh air in. Its total
depth shall not be less than 30 cm (1 ft).

11. Grease Trap
 Grease trap is installed in the waste pipe from one or more
fixtures for the purpose of separating grease from the
liquid and retaining the grease.

12. Inspection chamber,
A manhole, or inspection chamber, is an access point to an
underground utility network, such as a drainage system.
The presence of a drain or sewer manhole allows the
underground pipes to be inspected, surveyed, unblocked,
cleaned, or repaired.

13. Intercepting Trap
 Intercepting trap is provided in to the Interceptor
Manhole (Interceptor Chamber). An Interceptor manhole
is provided at the interception of building sewer and
Public sewer. Intercepting trap is provided to prevent the
foul gases from public sewers entering in to the building
sewer by providing water seal.

14. Aforementioned types of traps are widely used in plumbing
work but an ideal plumbing traps have following features or
benefits:
 Resistance to the impact damage and house hold chemical
 Prevent entry of foul air, insects and parasites from the
sewers
 Anti-rodent and self-cleaning
 Long service life
 Easier and quick installation
 Economical