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Question
In system drain pipe serves as vent pipe
A.
One pipe
B.
Single stack
C.
Two pipe
D.
Double stack
Answer ( Option B)

Single stack

Solution

Two-pipe system:
This is the best and the most improved method of system of plumbing.
In this system, two sets of separate vertical pipes are laid, i.e.
• One for draining night soil also called as soil pipe
• The other for draining sullage also called as waste pipe or sullage pipe
One-pipe system:
In this system instead of using two separate pipes, only one main vertical pipe is provided which collect night soil and sullage water.
Single Stack system:
The system is a single pipe system without providing any separate ventilation pipe.
This system uses one pipe which carries night soil and sullage water.

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