Andritz’s submersible motor technology success

In one of many world’s largest oil and gas fields, the firstever underwater compressor system employs ANDRITZ submersible motors. With their renewable winding these maintenance-free designed pumps have achieved spectacular results.
We are surrounded by fuel. From water bottles to the insulation in our homes, natural fuel is a key ingredient in virtually every product we use daily. According to the latest report issued by the International Gas Union (IGU) in 2019, the worldwide demand in gasoline has been rising by 35% of the past decade alone.
The reasons for this development are manifold, however the IGU determines three primary factors. First, the price competitiveness of gas in contrast to other vitality sources. Secondly, higher safety of provide with regard to infrastructure, delivery, and versatile use. Thirdly, fuel represents a sustainable form of vitality that may mitigate climate change and decrease localized air pollution. It has 50% fewer CO2 emissions in comparability with coal, for instance.
In order to satisfy this rising demand and use, the eco-friendly potential fuel must be extracted using a sustainable process. One of the biggest techniques is the Åsgard oil and gas area on the Haltenbanken, 200 km off the coast of Norway. It contains 52 wells combined in 16 gasoline fields and related by 300 km of oil pipelines. As of December 2018, the field has estimated sources of 9.9 million normal cubic meters of oil equivalent of oil and fifty one.1 million normal cubic meters of oil equivalent of fuel.
The system used includes three essential areas: Åsgard A, B, and C. Åsgard A is a floating oil manufacturing vessel that has been anchored there completely since extraction started in 1999. Åsgard B is a floating, semi-submersible gas and condensate processing platform for processing and stabilizing of gas and condensate. This platform is supplemented by the condensate storage facility Åsgard C and the 707 km-long Åsgard gasoline pipeline to the Karsto processing complicated to the north of Stavanger, Norway.
First on the planet Aker Solutions ASA has been supporting the Åsgard gasoline subject with numerous gasoline field products, methods, and providers since 2010. In time, the pressure in the storage facility in gas-producing fields drops. Compressors are needed to sustain the output. Aker delivered the first-ever underwater compressor system worldwide to Åsgard to have the ability to increase the output to 306 million barrels. These are normally installed on platforms above sea stage.
However, Åsgard is based on an underwater system. By using compressors on the seabed the recovery rates are improved and the funding and operating prices are lowered. In addition, underwater compression leaves a smaller ecological footprint and is extra reliable than a platform. The Åsgard system consists of modules for 2 identical sets of compressors, pumps, scrubbers, and coolers. The motors wanted to drive the pumps come from ANDRITZ.
Small, but essential
In 2010, Ritz Pumpenfabrik GmbH in Schwäbisch-Gmünd, Germany, became ANDRITZ Ritz GmbH and part of the ANDRITZ Group, as did the production of submersible motors. Due to the renewable winding, ANDRITZ submersible motors are appropriate for driving deep well pumps, bottom consumption pumps, suction pumps, seawater pumps, and underwater machinery.
Depending on the realm of utility, the motors can be made of cast iron, bronze or totally different sort of chrome steel and put in both vertically or horizontally. These are water-filled and watercooled, three-phase asynchronous motors with squirrel cages and a mech- anical seal. They are fitted with MCT, a particular cooling know-how. In designs with interior permanent magnet motor technology, or IPM for brief, these maintenance-free motors can obtain impressive outputs, efficiencies and, consequently, cost financial savings.
The efficient and measurable motor cooling system keeps the inside temp- erature as low as possible. Drinking water is used as a cooling liquid, which is why the motors can operate in media of up to 75° C. An impeller with optimized suction and delivery is mounted on the lower shaft finish of the rotor. One of its two primary tasks is cooling and lubricating the close by thrust bearing. By doing so, the impeller ensures there is a fixed move of cooling liquid in the proper path.
This liquid strikes via the within of the motor from the bottom to the highest. The specially developed cooling channels outline the exact path over all heat sources to discharge the heat effectively and systematically. At the top end, the heat from the liquid is then discharged via the motor’s outer wall. Here, it is transferred via the surface of the motor to the medium to be pumped.
The ANDRITZ submersible motors are only a tiny a part of the underwater compressor system, but they’re additionally a particularly essential half. The whole underwater station cannot function without these motors to drive the pumps. Since first being put in in 2016, these submersible motors have been operating with none faults. All in all, ANDRITZ Ritz delivered three twopole submersible motors with an output of 736 kw. The motor forms the condensate unit together with the pump and conveys those liquids that are removed by the separator upstream of the gas compressors.
In Ultimate , as a outcome of a failure in part of the system which was not supplied by ANDRITZ, the motor was despatched in for repairs, during which an in depth study was performed. Thermal distribution within the cooling flow and the hot spots were analyzed in more detail. The results also led to the design of a model new plate crosssection for the rotor plates.
Because of this, the motor to be repaired was additionally utterly overhauled and fitted with a brand new winding and a brand new rotor. This research and the implementation of its findings not solely benefit the present customer and future customers on this case, but in addition strengthen confidence within the ANDRITZ submersible motor technology.

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