Limitations
- vacuum systems are not capable of transporting sewage over very long distances, but can pump long distances from the vacuum station to the next STP or main gravity sewer.
- vacuum sewerage systems are only capable for the collection of wastewater within a separated system (not for the collection of storm-water)
- the lines can only reach up to 3–4 km laid in flat area (restrictions of the system due to headlosses (3-4.5 m) (friction and static))
- systems should be designed with help of an experienced manufacturer (concepts are usually free of charge)
- external energy is required at the central vacuum station. However, the collection pits do not require electrical energy.
- odours close to the vacuum station can occur, a biofilter may be necessary
- integrity of the pipe joints is paramount
- grease can clog the sensor tube (if set up incorrectly) thus requiring preventative maintenance cleaning
- mechanical controllers (float switches) require preventative maintenance for worn parts and seals
- vacuum valves can get stuck open leading to pressure drops in the entire system. However, a monitoring system can help identifying stuck open valves immediately
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