Andritz’s submersible motor know-how success

In one of the world’s largest oil and fuel fields, the firstever underwater compressor system employs ANDRITZ submersible motors. With their renewable winding these maintenance-free designed pumps have achieved impressive results.
We are surrounded by gasoline. From water bottles to the insulation in our properties, pure fuel is a key ingredient in virtually every product we use day by day. According to Pattern issued by the International Gas Union (IGU) in 2019, the global demand in gasoline has been rising by 35% of the past decade alone.
The reasons for this pattern are manifold, however the IGU determines three primary elements. First, the cost competitiveness of fuel in contrast to other power sources. Secondly, higher safety of supply with regard to infrastructure, supply, and flexible use. Thirdly, fuel represents a sustainable form of power that can mitigate climate change and decrease localized pollution. It has 50% fewer CO2 emissions compared to coal, for instance.
In order to meet this rising demand and use, the eco-friendly potential gasoline must be extracted utilizing a sustainable course of. One of the biggest methods is the Åsgard oil and fuel field on the Haltenbanken, 200 km off the coast of Norway. It contains 52 wells mixed in 16 gas fields and connected by 300 km of oil pipelines. As of December 2018, the field has estimated assets of 9.9 million normal cubic meters of oil equal of oil and fifty one.1 million normal cubic meters of oil equivalent of gasoline.
The system used includes three essential areas: Åsgard A, B, and C. Åsgard A is a floating oil production vessel that has been anchored there permanently since extraction began in 1999. Åsgard B is a floating, semi-submersible gas and condensate processing platform for processing and stabilizing of fuel and condensate. This platform is supplemented by the condensate storage facility Åsgard C and the 707 km-long Åsgard gas pipeline to the Karsto processing advanced to the north of Stavanger, Norway.
First in the world Aker Solutions ASA has been supporting the Åsgard fuel area with varied gas subject merchandise, techniques, and services since 2010. In time, the stress within the storage facility in gas-producing fields drops. Compressors are wanted to sustain the output. Aker delivered the first-ever underwater compressor system worldwide to Åsgard to find a way to enhance the output to 306 million barrels. These are usually installed on platforms above sea level.
However, Åsgard relies on an underwater system. By using compressors on the seabed the restoration rates are improved and the funding and working 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 equivalent sets of compressors, pumps, scrubbers, and coolers. The motors needed to drive the pumps come from ANDRITZ.
Small, but important
In 2010, Ritz Pumpenfabrik GmbH in Schwäbisch-Gmünd, Germany, became ANDRITZ Ritz GmbH and a half of the ANDRITZ Group, as did the manufacturing of submersible motors. Due to the renewable winding, ANDRITZ submersible motors are appropriate for driving deep nicely pumps, bottom consumption pumps, suction pumps, seawater pumps, and underwater machinery.
Depending on the area of software, the motors may be made from cast iron, bronze or totally different sort of chrome steel and installed 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 special cooling expertise. In designs with interior permanent magnet motor expertise, or IPM for short, these maintenance-free motors can achieve impressive outputs, efficiencies and, in consequence, value savings.
The efficient and measurable motor cooling system retains the inside temp- erature as little 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 supply is mounted on the decrease shaft end of the rotor. One of its two main tasks is cooling and lubricating the close by thrust bearing. By doing so, the impeller ensures there’s a fixed move of cooling liquid in the proper direction.
This liquid moves by way of the within of the motor from the underside to the top. The specially developed cooling channels define the exact path over all warmth sources to discharge the heat effectively and systematically. At the top end, the warmth from the liquid is then discharged through 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 are also an especially essential half. The entire underwater station cannot function with out these motors to drive the pumps. Since first being put in in 2016, these submersible motors have been working 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 along with the pump and conveys these liquids which might be removed by the separator upstream of the gasoline compressors.
In 2017, because of a failure in part of the system which was not provided by ANDRITZ, the motor was despatched in for repairs, throughout which an intensive research was performed. Thermal distribution in the cooling move and the recent spots were analyzed in more detail. The results additionally led to the design of a model new plate crosssection for the rotor plates.
Because of this, the motor to be repaired was additionally completely overhauled and fitted with a new winding and a new rotor. This research and the implementation of its findings not only profit the current customer and future clients in this case, but additionally strengthen confidence in the ANDRITZ submersible motor expertise.
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