drainage system
DESCRIPTION
ppt about envt. engg.TRANSCRIPT
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Aditi K. ShahRol l No. : 45
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Traps
A trap is a depressed or bent sanitary
fitting which always remains full of water
(water seal). The function of a trap is to
prevent the entry of bad smelling gases into
the house. The effectiveness depends upon
the depth of water seal, which varies from
25 to 75mm
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Requirements of good trap:
1. It should be capable of being easily cleaned.
2. It should be easily fixed with the drain.
3. It should be of simple construction.
4. It should possess self-cleansing property.
5. It should posses adequate water seal to fulfil the purpose of installation.
6. It should be free from any inside projection which are likely to obstruct the passage of flow of sewage.
7. The internal and external surfaces should be of smooth finish.
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Types Of Traps:
a. P-trap.
b. Q-trap.
c. S-trap.
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P- trap:
• As its name suggests, the p-trap vaguely
resembles the letter "p" when turned on its
side.
• P-traps exit into the
wall
behind the sink
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S- trap:
• The "S" shape traps water so that odours
from the sewer don't come up through the
drain. A second and only slight benefit from
the shape is that it can trap heavier objects,
such as rings, that fall into the drain.
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Q- trap:
• This trap is used in toilet under water
closet. It is almost similar to S trap and is
used in upper storey other than ground
floor.
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Vent pipe:
• The pipe installed for the purpose of
ventilation is known as vent pipe through
which foul gases escape into atmosphere.
• Without a vent pipe (stack vent), as
wastewater flows down your waste pipe, a
partial vacuum would develop at the top of
the pipe which would stop the wastewater
from flowing the rest of the way down.
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Vent pipe (fig.):
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Rainwater pipe:
• The pipe carrying only rainwater (from the
roof tops) is called rain water pipe.
• The advantage of rainwater pipes is:
1)Prevents accumulation of water
on roof.
2)Water can be collected for
harvesting, domestic purposes
like washing, cleaning etc.
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Rainwater pipe (fig.):
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Anti- siphonage pipe:
• Anti- siphonage pipe means any pipe
provided in conjunction with a trap in the
sanitary fitting to prevent unsealing of the
trap by siphonage or back pressure.
• Back- siphonage causes breaking of the
water seal therefore anti-siphonage pipe is
requires
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Anti- siphonage pipe (fig.):
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