Mavel Kaplan BULB Turbine
Technical Specification
1.1.1 Turbine Basic Data
Turbine Type Mavel KA
Number of Runner Blades 4
Number of Wicket Gates (Guide Vanes) 16
Turbine Distributor Closing System Hydraulic
Type of Guide Bearing
Roller, (integrated in the gearbox)
Type of Thrust Bearing
Roller, (integrated in the gearbox)
Location of Runner Blade Servomotor End of Gearbox Shaft
1.1.2. Materials *
¢ EN
Name cuter Material Standard
Bulb $355J2/S355JR EN 10025-2
Runner Blades G-X4 CrNi 13-4 EN 10283
Runner Hub GJS 500-7 EN 1563E
Turbine Shaft 42CrMo4 EN 10083-3
Guide Vanes GJS 500-7 EN 1563E
Guide Vane Bearings bushes with liners from KU, DU, ZEDEX or equivalent
Housing for Guide Vane Bearings GJL-200 EN 1561
Guide Vane Distributor Chamber GJL 300 or $355J2/S355JR EN 1561 or EN 10025-2
Gate Operating Mechanism §355J2/S355JR EN 10025-2
Gate Operating Ring $355J2/S355JR EN 10025-2
Discharge Ring GJL 250 EN 1561
Draft tube §355J2/S355JR EN 10025-2
* Final material specification will be a part of detailed design.
1:2 Turbine Body
The turbine body consists of the turbine
intake and the turbine casing. The turbine intake is the first
part of the turbine body. It is made of steel plates forming a transient piece (from circle to rectangle)
and it is seated in the concrete.
The turbine casing is a welded steel plate fabrication functioning as the main supporting part of the
hydro-mechanical unit. The generator is fixed on the top of the turbine casing by means of a flange.
The upstream end of the turbine casing is connected to the turbine intake and forms the water passage
distributor. In the center, there is a pillar and inner bulb for location of bevel gearbox. Two ribs in the
interior are used to fix the gearbox. The downstream section is a machined ring that mates with the
turbine distributor. The centerline of the turbine body is coincidental with the turbine runner axis.
March 2019
KA_Rev04
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