Test Your Understanding Regarding Jets Vacuum Piping System
- 1.What are the 3 main elements in a Jets vacuum toilet system?
- A.
Vacuum toilets, sewage treatment plant+ vacuum piping system
- B.
Vacuum generating unit + piping system for transport of sewage + toilets, urinals, grey water interface units
- C.
Vacuum generating unit + vacuum piping system + STP
- 2.Is this true or false?The vacuum level in a toilet piping system should be 40-55% vacuum in idle position.
- A.
True
- B.
False
- 3.Is this statement true or false?In a vacuum toilet system difference in air prossure is used to transport seage from toilets to a vacuum generating unit.
- A.
True
- B.
False
- 4.How much air is sucked into the vacuum piping for each time the toilet is flushed?
- A.
10-20 litres
- B.
30-40 litres
- C.
60-80 litres
- 5.Between flushes sewage and water is collected in ?
- A.
The transport pockets of the piping system
- B.
The grey water interface units
- C.
The sewage treatment plan (STP)
- D.
A collecting tank
- 6.Each time a vacuum toilet is flushed; what happens to the vacuum level in the piping system?
- A.
The vacuum level in the piping system will increase
- B.
The vacuum level in the piping system will decrease and the vacuum generating unit will start to re-build the vacuum level
- C.
The vacuum level will remain unchanged in a correctly installed piping system
- 7.How far in the piping system will the seage move for each time a toilet is flushed?
- A.
Alle the way from the toilet to the STP or collecting tank
- B.
20-30 meters
- C.
5 to 15 meters
- 8.Where in a vacuum system should the vacuum generating unit (VacuumaratorTM pump) be located?
- A.
At the highest point of the vacuum system
- B.
At the lowest point
- C.
At the same height as the toilets in the system
- 9.What is meant by the expression "Backflow"?
- A.
Sewage is flowing from the toilet to the vacuum generating unit
- B.
Sewage is flowing form the vacuum generating unit to the collecting tank
- C.
Sewage from upper pipes flowing back to the rising pipe connected to the toilet
- 10.What other subjects should be considered when installing a vacuum piping system?
- A.
The size of the ship and the risk of varying trim and list of the ship
- B.
The speed of the ship
- C.
The waters in which the ship is designed to travel
- D.
The outside temperature
- 11.What should be considered when installing a vacuum piping system in a ship where the totale pipe volume is less than 160 litres?
- A.
To make the dimension of the pipes as big as possible
- B.
To install bigger VacuumaratorTM pumps
- C.
To install a vacuum accumulating tank
- 12.What is a "rodding point"?
- A.
A point in a vacuum piping system where access to the piping is gained for cleaning
- B.
A point where the pipining system is at its highest point
- C.
A point where the pipining system is at its lowest point
- 13.Why should transport pockets be installed in a vacuum piping system?
- A.
To prevent backflow to the toilets
- B.
To make cleaning of the piping system possible
- C.
To re-form slugs and thus secure the speed of the transport of sewage in the piping
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