Vaptech Ltd. products

Hydropower stations are built to withstand the tests of extreme conditions and time. With the right maintenance program, the life of the electromechanical system can be extended for more than 100 years. For the existing power stations VAPTECH provides diagnostics and analysis, emergency services, spare parts, repair, redesign to increase the turbine efficiency, modernization of the hydraulic and control system, and installation of additional capacity.

Pelton turbines are an excellent solution for projects with high to medium heads and strong flow variation. VAPTECH provides Pelton turbines with horizontal or vertical shaft arrangements from 1 to 6 injectors. According to VAPTECH standards the Pelton runner is CNC machined from one piece of high quality stainless steel forging. The runner is designed, controlled and accepted according to the IEC standards. The injectors are equipped with hydraulically operated individual deflectors for immediate diversion of the water jet from the runner in case of emergency shutdown. Every injector is put under a series of functional and pressure tests.

Francis turbines are used mainly for medium heads and relatively low fluctuation of the water discharge. Francis turbines developed by VAPTECH demonstrate proven reliable performance in terms of efficiency, lack of cavitation and vibration in the complete specific speed range from ns 80 to ns 300. The runner is a welded or machined construction of high quality stainless steel. The runner is designed, controlled and accepted according to the IEC standards. Francis turbines, developed by VAPTECH, are fully assembled, pressure and functionally  tested in our workshop. The assembled and tested turbine is delivered on site ready for a swift and smooth installation.

The standard line of VAPTECH Spherical valves is designed for diameter range from 300 to 1000 mm and pressure ratings 40, 63 and 100 bar. The valve actuation is with a hydraulic cylinder and closing is with a counter weight. The seal of the rotor to the valve body is realized by a movable stainless steel sealing that is actuated through a water-oil pressure system. Outside of VAPTECHs’ standard product, spherical valves are developed with specific pressure ratings of up to 100 bar and diameter up to 3000 mm. The sealing system can be optionally equipped with an additional maintenance seal that, when activated, allows for inspection of the main seal without draining of the penstock water.

The axial turbines are designed for projects with low and very low heads with a strong flow variation. VAPTECH offers mainly the classic vertical shaft Kaplan turbine with 3 to 6 runner blades and with double regulation. For runner diameters up to 1400 mm we use a steel spiral casing and for bigger runner diameters we recommend a concrete spiral casing. Our solution and advice is for a direct coupling of the generator shaft to the runner without the use of speed increaser and therefore without loss of efficiency. The runner is manufactured from high quality stainless steel castings with CNC machining. The blades surface is controlled to assure the integrity of the physical part with the computer model.

For continuous and optimum operation. VAPTECHs’ digital control system is designed to provide full automation for the regulation, interaction and synchronization of all hydromechanical  systems: Turbine regulating system, Turbine inlet valve, Bypass system, Intake hydraulic steel structures. The automation algorithm is developed by VAPTECH experts and is intended to deliver smooth operation of the entire electromechanical system. Based on the specific requirements of the customer and the grid operator,  the mode of the turbine regulator can be set according to the water intake level or the capacity of the generating unit. The control system can be easily accessed remotely via wireless means. The innovative software package for real-time-monitoring, preventive and predictive maintenance of the industrial equipment offers a user-friendly platform for an efficient fault and events diagnostics to achieve a smooth management process.

The axial turbines are designed for projects with low and very low heads with a strong flow variation. VAPTECH offer vertical and horizontal (pit) shaft Kaplan turbines with 3 to 6 runner blades and double regulation. The design covers metal and concrete spiral cases  for vertical arrangements and metal and concrete pits for horizontal arrangements. The runner is manufactured from high quality stainless steel castings with CNC machining. The runner is designed, controlled and accepted according to the IEC standards.