LeeSan, the Warwickshire based Marine Sanitation Specialists, has supplied two large (3,360-Litre) tanks with dual pump transfer systems to a Thames based passenger ferry company in London UK.

They feature stainless steel, automatic probe monitoring equipment which senses the level of the contents and activates the pumps when necessary. The tanks are to be surface mounted to the quayside pontoon where the boats dock to load and unload passengers and stores. They are both fitted with quick release, tank to vessel, connections, safety operation panels and LeeSan’s new 3-inch Carbon Filter Microvents for ventilation to air.

Few people probably ever wonder what happens to the waste after they use the “facilities” on board one of the many Thames ferries or tripper boats but, of course, it all has to be disposed of somehow. The answer is that initially black and grey waste is pumped into onboard holding tanks by specialist marine sanitation equipment, where it is held until the vessel returns to port. On arrival back at its home pier, the pipework is coupled up to a discharge system where the waste is transferred into large holding tanks. These then pump everything up to the main sewers.

This is all complicated by the fact that the Thames is tidal, which means that the lift the pumps need to handle varies depending on how high or low the water is. In this instance the system has to discharge a distance of 130 metres, with a head of up to 5-metre.

Karl Sutcliffe, LeeSan’s Technical Director, said: “This was a tough one for us to specify due to the allowable limits placed on the Litres-Per-Minute discharge to the main sewer. This fact had to be calculated in combination with the different flow rates required at any state of the tide. However, our experience over many years of dealing with these types of challenges has allowed us to provide a great solution, which the vessels operators say is working perfectly.”

On board, each ferry has a 2,500-litre holding tank with a single, submersible pump to discharge to the new tanks on the dock.

Over the past 30 plus years LeeSan has supplied this type of specialist marine sanitation equipment to military, commercial and leisure craft worldwide and continue to be the “go-to” company for these products.

 

 

 

 

 

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