tubular turbine is better for low water head and large water flow
Kaplan Turbine is suitable for medium & low water head and large flow power 
plants. With same water head, the Kaplan runner speed is higher than that of 
the Francis'. The Kaplan runner blade can be either fixed and rotatory. The key 
components include: Kaplan runner, Distributor, Main shaft, Main shaft seal, 
Turbine guide bearing, Governor, Draft tube, Spiral case.
Tubular Turbines are suitable to lower water head, is a kind of horizontal 
turbine with straight flow channel. There is no spiral case in Tubular turbine, 
and its blades can be fixed or rotatory. The key components include: Tubular 
runner, Distributor, Turbine guide bearing, Governor among other.
Kaplan turbine Tubular Turbine
Water Head: 3 ~ 80m 2 ~ 25m
Output: 0.1 ~ 200MW 0.05 ~ 57MW
Frequency: 50/60HZ 50/60HZ
Runner Dia.: 1 ~ 11m 1 ~ 7m