Exam Question
With reference to Vacuum Sewage Systems:
(i) Sketch & Describe a Vacuum sewage system.
(ii) State the advantage of Vacuum sewage system.
(iii) State the different causes of dropping vacuum.
Class 2 (2nd Engineer)
MEKG
📅 Oct 2018
Reference Answer
(a) The system uses vacuum to transport sewage from toilets and urinals to collecting units. There is a vacuum only in the piping network and the toilets, urinals etc. remain under atmospheric pressure unless when the flush button is pushed. Each toilet is connected to the vacuum piping. The connection is shut all times, except during the toilet flushing. When the toilet is flushed, its discharge valve opens the connection to the vacuum piping network for a pre-set seconds and the contents of the bowl will be evacuated. When the vacuum tank is full, the contents is automatically pumped into larger storage tanks that are maintained under normal atmospheric pressure.
(b) Advantages of a Vacuum Sewage System:
The vacuum sewage system uses 85–90% less water for flushing compared to conventional systems, requiring very little flushing water.
Toilets can be positioned more flexibly, including below the level of the holding tank, which is not feasible with gravity-fed systems.
(b) Advantages of a Vacuum Sewage System:
The vacuum sewage system uses 85–90% less water for flushing compared to conventional systems, requiring very little flushing water.
Toilets can be positioned more flexibly, including below the level of the holding tank, which is not feasible with gravity-fed systems.
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