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Our main fields of work are: Hydraulics and pneumatics Power transmission Process and plant automation Automation of machines and device for various applications Training and education tools Environment preservation and protection Measurement, control, supervision and testing Lubrication and filtration Overhaul and redesign of aforementioned applications 2
Products: Services: Hydraulics and pneumatics Automation of manufacturing processes Lubrication and filtration Power train and transmission Measurement and certification Special purpose devices Hydraulics and pneumatics Engineering 3
Vibration test stand Servo-hydraulic measuring system used for static and dynamic analysis of materials and devices. Its construction is adaptable to every load examining task set before him (stretching, pressing, vibrating…). It generates functions of static and dynamic load (impulse, periodical of random). Upon the request of Faculty of Mechanical Engineering in Kragujevac, we have developed and delivered hydraulic platform capable of providing exciting force with two degrees of freedom. Load can be simulated in one or two axes simultaneously within frequency range from 0,1 to 31 [Hz] and with amplitude of ± 45 [mm]. The load of vibrating working deck is up to 200 [kg]. 4
This electro-pneumatic device has three operating channels which enables it to provide secure release of safety valves in power plant boilers (pre heater, inter heater and drum) when inlet pressure reaches releasing point. Devices also has additional pressure load securing seal to the seat, providing lower steam leakage, which fulfils requirements set by standard SRPS-ISO-4626-1. In conclusion with year 2010., we have delivered and deployed six devices for operating of safety valve in JP “Power plant Nikola Tesla – Kolubara ” in Obrenovac. These devices operate safety valve on steam super heaters on boilers no. 1, 3, 4 and 5 (D = 135 [t/h]) and safety valve of pre heater, inter heater and drum on block A5 (D = 380 [t/h]). Picture: Safety valves control device. 5
We have designed, manufactured, delivered and deployed hydraulic installation for drive of the intake valve for the Hydropower Plant “Studenica ”. This mini hydropower plant “Studenica” is located on the river of the same name, in vicinity of the famous monastery Studenica. Installed turbine is a Kaplan type turbine of similar geometry as the turbines at hydropower plant “Djerdap 1”. Taking into consideration relatively flat flow rate and steady head during utilization, which are very close to nominal, this turbine has the same efficiency rate as double regulated turbine at changeable flow and head. The selected turbine does not have moveable wicked gate and runner. For reasons afore mentioned, regulation of putting power plant in and out of the operation, should be done by hydraulic power unit with predetermined opening and closing times of the turbine inlet valve. These times of opening and closing are adjustable on hydraulic power unit and are preset during turbine commisioning. Picture: Hydraulic installation for operating turbine inlet valve at Mini Hydropower plant “Studenica”. 6
We have adapted hydraulic power unit and hydraulic installation for coal bunker shutter type:160-11-L325-16/23 at Power Plant “Kostolac ” c.o.o. 7
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Power transmissions and drives Overhaul of “PIV” variator in power plant “Kostolac” and power plant “Morava” Upon the request of the company PPCM “Kostolac” and PP “Obrenovac” – TPP “Morava”, we have reconstructed “PIV” variator of the coal dozer and coal feeder. Original variators of coal dozer and coal feeder are “PIV” mechanical type with plate geared disc and special purpose chain drive. We have accommodated them with frequency regulators in order to modernize the system and get faster response. Old mechanical variator system is removed and new gear couples were installed retaining predefined rations. Picture: Overhauled “PIV” dozer variator. 9
Upon the request of JKP “Belgrade plants” we have overhauled the demaged “VOITH” hydrodynamic variable speedcoupling, type: 826-SL-II , with following characteristics: P = 1100 [kW], n = 14850 [rev/min]. Picture: Examined coupling at JKP “Belgrade planst”, in use for more than three years. 10
Hand gripe measuring device We have been asked by Faculty of Sport and Physical Education, University of Belgrade , to develop and manufacture device for precise static and dynamic examination of motor function of hand and fingers at persons with certain brain injuries. The device is assembled from lightweight, compact aluminum casing which encompasses gauges for measuring gripe pressure. During examination device is loaded longitudinally to tension and pressure. In order to protect device from breaking due to bending, a spherical bearing is inserted. This also allows to measure gripe force for each hand individually. Total weight of the device is 520 [g] Picture: Measuring hand gripe. 11
Mini hydropower plant “Moravica”in Ivanjica Turbine regulation Modernization of the Mini Hydropower Plant “Moravica” in Ivanjica built in year 1911. We have redesigned turbine regulation and drive for turbine control gate. This was done while preserving the original look of the hydro plant. 12
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3D model example of a HPU with control hydraulics for a 25 [MW] Kaplan turbine control system. 14
Based on the contractor’s request, we have replaced measuring and control equipment on installations of power units 1 and 2 used to drive pumps at “PAP Lisina”. We have also installed new ones, while keeping old ones for double checking the measured variables. 15
Upon the request of the contractor, we have replaced measuring devices on turbine installations on blocks “A” and “B” in Hydropower plant “Vrla 4”. We have also installed new measuring and regulating equipment, while keeping old ones in order to retain higher degree of system protection. 16
At turbine unit in the Hydro power plant “Vrla 3”, we have replaced the measuring equipment. In order to modernize operating turbine unit, we have installed the new measuring equipment on subsystems. The purpose of the new equipment is to allow more precise measurement and control of system parameters. 17
Upon the request of contractor, we have reconstructed the support bearing lubricating system on turbines generator A1, lead bearings’ lubricating system on turbine generator A1 and butterfly valve used for regulating cooling of generator A2. We have designed, delivered and deployed a modern device precise for measuring of the speed of rotationof an steam turbine, as a part of the modernized turbine control system (n N = 600 [rev/min]. Reconstruction of lead bearings’ lubricating systems. 18
Deployment of hydraulic equipment for regulation of auxiliary drive of turbine in Hydropower plant “Vrla 1”. In hydropower plant “Vrla 1” on hydraulic installations we have overhauled regulatory system by implementing regulating valves with electric motors . Entire plant is run remotely via SCADA system. 19
We have designed, delivered and deployed a modern device precise for measuring of the speed of rotationof an steam turbine, as a part of the modernized turbine control system (3000 [rev/min]). 20
As part of the reconstruction of control panel and regulating and measuring equipment on dams “Barje” Leskovac and “Bovan” Aleksinac , we have replaced existing and installed new equipment . Measuring and regulating equipment we installed is incorporated into SCADA system which in turn ensures that overseeing and controlling the system from command center is reliable. This allows system control both remotely and locally, also by hand or by automatic control. Installed equipment is fully up to date and reliable. It also takes into consideration any further development and expansion that are scheduled in foreseeable future in plans regarding JVP “Morava” Niš. Picture: “Bovan” dam – installed measurement and regulatory equipment. 21
Picture: “Barje” dam - installed measuring and regulating equipment. 22
Contractor: LUK – Kompenzatori, co. Loznica On the basis of the written request of contractor we have executed following services: а) Analyzing spring force torque and resistance torque of articulated compensator (type UJI6/600/12/C/1), S/N: RPB1-3/10/08 б) Conducting examinations of device’s life expectancy (analyzing breakage point of material) at pre set ambient conditions and according to standards for pressurized vessels. Every analysis is conducted upon the regulations and standards of the association of manufacturers of compensators. (“ Standards of MHPP expansion joint manufacturers association, Inc.” ) Picture: Laboratory of examining compensators – LUK Kompenzatori 23
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