Custom Francis turbines

Francis turbines are reaction turbines suited to medium-head plants with very varied flow rates. They are, by far, the most versatile hydraulic turbines and the most widespread in medium-sized plants.

Servoship manufactures custom Francis turbines with power outputs of up to 3,000 kW and heads of between 15 and 200 metres, with either a horizontal or vertical shaft. Additionally, to make use of existing civil works infrastructure, we build them in an open flume for heads of between 3 and 7 metres.

One of the advantages of the Francis turbine is its ability to operate far from the nominal point while maintaining good efficiency. Our turbines accommodate variations between 105% and 40% of the nominal flow and between 120% and 60% of the nominal net head, with an efficiency at the optimal point of approximately 90%.

Parameter	Servoship Francis turbine
Type	Reaction
Head	15 – 200 m (medium); 3 – 7 m in open flume
Flow rate	Various
Power output	Up to 3,000 kW
Efficiency (optimal point)	~90%
Permissible flow variation	105% – 40% of nominal
Permissible head variation	120% – 60% of nominal
Shaft configuration	Horizontal or vertical

We design and manufacture the complete turbine, adapted to the head, flow and civil works of each plant, with in-house after-sales service and spare parts (including equipment from the former Eimar brand).