Works related to the modernization of the boiler – rotary air preheater

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.

Nov 18

The Crusher

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

Nov 18

Regeneration of the surface of the long journal

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 […]

Nov 18

Flanges’ faces machining – facing

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

Nov 18

Machining of a new flange

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

Nov 18

Milling the foundation plate

In order to obtain the desired state of dynamics of the device, it is first of all necessary to take care of the quality of the foundation, i.e. the adherence of the device base (flaps) to the foundation plate. It is important to maintain the flatness of the foundations plates, but the second, often forgotten, and an extremely important parameter is the deviation of the position of the foundation plate plane in relation to the basic plane, i.e. the sea level plane (water level). In this case, the total deviation of the flatness and level shall not exceed 0,05 mm/m.

Feb 06

PRODUCTION OF FASTENERS AND SPARE PARTS

Initially only for our own, more and more and more often, we produce special fasteners (not standardized). In our case, our own needs mean mostly customizing mobile equipment to specific cases of service – adaptation the machine to the workpiece, clamping of machining tools, supports or additional bearings. It turned out that there is a demand for such items, usually previously not foreseen, during dismantling or after treatment. A typical example of such a situation are works by flange connections, when it turns out that some of the screws are simply stuck, and hence, must be destroyed when dismantling. To meet the expectations, having gathered a lot of experience, we are now able to offer a more comprehensive approach to widely understood screw connections, ranging from dismantling, including disassembly of the destroyed (rough, worn off, blocked in any way) the screws and studs, through correction of geometry and surface quality of the connection, the correction of damaged […]

Jan 03

Legalization of pads’ surface in the gases plant

WWTECH team again was a contractor of works, where the time of reaction and quality of the execution were the key parameters of the Contractor choice.

Dec 24

Making of stop valve’s machining

WWTECH Services team has made a facing of stop-valve’s surfaces in pumped storage water power plant in Poland.

Nov 21

WWTECH has completed the machining works on a huge OFF-SHORE construction. Buoy and turret are designed for the mining field Martin Linge.

WWTECH SERVICES has performed all accurate machining on the buoy and turret structures of the Martin Linge project implemented by Energomontaż Północ Gdynia for National Oilwel Varco (APL). Machining works were based on the technology of WWTECH company, specially designed and adjusted portable machines. Our quality control department has taken care of the works accuracy which is equipped with modern measurement system. The elements to mine oil are buoy and turret . The total weight of the structure is more than 500 tons, the elements are 18 m high and 15 m in diameter. This is another very complicated machining project which was realized for the EPG based on the […]