Design flexibility
Smaller space between the decks- Substantial savings in materials and construction costs
- More flexible designs possible
- Piping independent of gravity: rising pipe and horizontal lines without slope are possible.
- Easier to position toilets – and lower-deck toilets need no separate pumping station
- Easier retrofit with less deck penetration
- Easier compliance with ever stricter international discharge regulations
Smaller pipes
- Smaller diameter
- Lightweight pipes
- Fewer – and smaller – deck penetrations
- Lower-cost components
Fewer installation hours
- Lighter materials mean streamlined handling and reduced installation time
- Simpler logistics – lower costs
- Piping can be routed around ducts and other obstacles
- Can be installed later than gravity piping
Water and sewage benefits
- Saves precious water and weight on board
- Less need for freshwater production and storage
- Allows significantly smaller STP
- Lower waste volume for the same number of toilets
- Closed systems keeps sewage gases where they belong
- No need for ventilation of piping
- Withstands the roll and pitch of the vessel without risk of water or sewage leakage, even in harsh weather
