Screw Generator

Advantages

• Ideal application of the screw generator with small geodetic heads.

• High and constant efficiency with different capacities and head: The efficiency curve shows a flat and high efficiency over a wide range of the capacity. Varying capacities and heads hardly have effect on the efficiency. The screw generator does not need any grease pump for lubrication of the bottom bearing which will improve the efficiency and decrease operational costs.

• High efficiency compared to the water Wheel and small turbines.

• Fish friendly: Several tests have showed the fish friendliness of the Spaans screw pump and screw generator. In the Netherlands, Canada, the USA and other countries, the Spaans screw pump will also be used as a fish ladder by pumping fish.

• Robust, extreme reliable and a long life time: The Spaans screw generator, consist of a few wear parts. The combination with the low rotational frequency results in low wear. A lifetime of 25 till 30 years is not an exception, where the efficiency stays the same over the years.

• Open system: Large solid parts such as plastic, wood or small stones can pass the screw generator without having any effect on the screw generator or the efficiency.

• Maintenance friendly and low maintenance costs: Due to the simple and robust design, Spaans screw generator installations require minimum maintenance.

• No fine screen is necessary.

• Only a simple static bar screen can eventually be used to prevent large items enters the screw generator. This saves costs, prevent head loss and allow fish passage.

• Can operate with variable and fixed speed.

• Power generation up to 500 kW.

• Wide range of flows. The Spaans screw generator is capable of handling flows from 100l/s - 15m3/s each.

• Multi stage application possible.

• Wide range of heads. Any head up to 12m for a single stage up to 24m for a two stage installation is possible.

• No cleaning necessary. Cleaning of the screw generator is not necessary. The generator is self cleaning. No efficiency loss due to dirt build up.

• Low civil costs. Simple foundation with two concrete supports can be sufficient. Units can be specifically designed to suit existing civil layouts.