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Question
Identify the figure:
A.
Single stack partially ventilated system
B.
Single stack system
C.
One-pipe system
D.
Two-pipe system
Answer ( Option C)

One-pipe system

Solution

System of Plumbing
1. Single stack system
2. One pipe system
3. Two pipe system
4. One pipe partially ventilated system
One pipe system
• In this system of plumbing, the waste connections from sinks, baths, washbasins, and the soil pipe which is connected directly to the drainage system.
• Gully traps and waste pipes are completely dispensed with. But all the traps of W.C. basins, etc. are completely ventilated to preserve the water seal by a separate vent pipe.
The following precautions should be taken in this plumbing system
(a) All the joints off waste pipes should be air-tight.
(b) Each waste pipe should be connected to common stack directly.
(c) Vent pipe diameter should not be less than 50 mm.
(d) The waste pipe should join the stack, above the soil branch at each floor.
(e) All traps should be provided with a deep-water seal of not less than 7.5 cm.

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