Bjufors HPP, a power plant owned by Statkraft, is located on the Umealven River in northern Sweden. It consists of two units with a total power of 42 MW. Similar to Bergvik, in 2023, we carried out mobile machining services at Bjufors for Unit 1, and this year, the same scope of work is being performed for Unit 2. The scope includes: machining of the rotor chamber (spherical surface).
Balforsens HPP, a power plant owned by E.ON, is located at the Ume reservoir dam in northern Sweden. It consists of two units with a total power of 88 MW. In 2024, we carried out mobile machining services at Bjufors, focusing on the machining of the runner chamber – spherical surface, for Unit 1.
Ojeforsen HPP, a 28.8 MW power plant owned by Fortum, is located on the Ljusan River in northern Sweden. In 2024, we carried out mobile machining services at Ojeforsen, focusing on the machining of the runner chamber – spherical surface.
Hydroelectric power plant of Chaira (Chaira PSHPP) was built in the Rila Mountains, about 100 kilometers southeast of the Bulgarian capital, Sofia. Chaira has a generating capacity of 864 megawatts (1,159,000 HP) and a pumping capacity of 788 megawatts (1,057,000 HP). The plant is equipped with four reversible Francis-type pump-turbines, each with a power of 216 megawatts (290,000 HP) in generating mode and 197 megawatts (264,000 HP) in pumping mode. Units 1 and 2 have been in operation since 1995, and during that time, Chaira was the largest pumped-storage power plant in southeastern Europe, with the highest single-stage pump-turbine drop in the world (690 meters in generating mode and 701 […]
Bergvik HPP, a Fortum-owned power plant located between Lake Marmen and Lake Bergviken in central Sweden. Two units with a total capacity of 16.2 MW. In 2023, we provided mobile machining services on Unit 1, and this year, the same scope on Unit 2. The scope included: machining of the runner chamber (spherical surface) and the creation of a seal groove in the lower ring. Machined sphere in the runner chamber Milling of the seal groove
A Rotary Air Preheater is a rotary heat exchanger in which heat exchange takes place thanks to the heat capacity of slowly rotating elements – sheets placed on the rotor. These elements take over the heat from the flue gases from the boiler (they heat up) and transfer it to the air sucked in from the environment, next directed further to the boiler burners. Thanks to the use of OPP, the efficiency of the installation is significantly improved by recovering a large part of the heat from the flue gases. OPP is used in virtually all solid (coal) fuel boilers. Our scope included machining work in four holes: rounding/turning of the hole to size Ø615H7, facing from approx. Ø120 mm to Ø 615 mm with allowance 50 mm (very large allowance!), production and assembly of centering sleeves, drilling and threading holes in the heater body and covers.
A large scope of works related to the main overhaul of the device. Facing approx. Ø1000mm Lock turning approx. Ø1000mm Facing approx. Ø500mm Turning the diameter approx. Ø500mm Turning the diameter approx. Ø600mm Facing approx. Ø600mm Turning the conical surfaces of the body and cover approx. Ø1900 mm
The heavily damaged surface of the journal is salvageable! If the scratches are too deep and it is possible to make mating elements (e.g. bearing shells) on a slightly smaller shaft diameter, then turning is enough to remove scratches and grooves and obtain the right surface quality. If it is important to maintain the original diameter, the turning operation must be preceded by premachining (optional) and layer welding. Only then can the original geometry be restored. We implemented such technology, for example, in the Bujagali power plant, Bujagali HPS, Uganda | WWTECH – On site machining In both cases, the last step of treatment can be honing using the same […]
This time the faces of flanges – pipes of the gas collector. A task very similar to the one recently carried out: Flanges’ faces machining | WWTECH – On site machining
The purpose of standard flange machining is to obtain the correct flange geometry: flatness of 0,05 mm, perpendicularity to the axis – not more than 0,02 mm, and, importantly, adequate surface roughness (< 3.2 μm) More: Machining of flanges | WWTECH – On site machining
