Andritz’s submersible motor know-how success

In one of the 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 outcomes.
We are surrounded by gas. From water bottles to the insulation in our properties, pure fuel is a key ingredient in virtually every product we use every day. According to the newest report issued by the International Gas Union (IGU) in 2019, the global demand in gas has been rising by 35% of the past decade alone.
The reasons for this trend are manifold, however the IGU determines three primary components. First, the fee competitiveness of gas in contrast to other vitality sources. Secondly, larger security of provide with regard to infrastructure, delivery, and versatile use. Thirdly, gasoline represents a sustainable form of power that may mitigate climate change and decrease localized air pollution. It has 50% fewer CO2 emissions in comparison with coal, for example.
In order to meet this rising demand and use, the eco-friendly potential gas must be extracted utilizing a sustainable process. One of the most important methods is the Åsgard oil and gas field on the Haltenbanken, 200 km off the coast of Norway. It incorporates fifty two wells mixed in sixteen gasoline fields and related by 300 km of oil pipelines. As of December 2018, the sphere has estimated sources of 9.9 million commonplace cubic meters of oil equivalent of oil and fifty one.1 million normal cubic meters of oil equal of gas.
The system used includes three important 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 fuel 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 complex to the north of Stavanger, Norway.
First on the earth Aker Solutions ASA has been supporting the Åsgard fuel area with various gasoline field merchandise, systems, and providers since 2010. In time, the stress in the storage facility in gas-producing fields drops. Compressors are needed to maintain the output. Aker delivered the first-ever underwater compressor system worldwide to Åsgard in order to enhance the output to 306 million barrels. These are normally installed on platforms above sea level.
However, Protected is predicated on an underwater system. By using compressors on the seabed the recovery rates are improved and the investment and operating costs are lowered. In addition, underwater compression leaves a smaller ecological footprint and is extra dependable than a platform. The Åsgard system consists of modules for 2 equivalent units 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, turned 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 nicely pumps, bottom consumption pumps, suction pumps, seawater pumps, and underwater machinery.
Depending on the realm of software, the motors could be manufactured from forged 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 expertise. In designs with interior everlasting magnet motor technology, or IPM for brief, these maintenance-free motors can obtain impressive outputs, efficiencies and, in consequence, cost savings.
The efficient and measurable motor cooling system keeps the interior temp- erature as low as potential. Drinking water is used as a cooling liquid, which is why the motors can function in media of up to 75° C. An impeller with optimized suction and supply is mounted at the lower shaft end of the rotor. One of its two major duties is cooling and lubricating the nearby thrust bearing. By doing so, the impeller ensures there’s a fixed circulate of cooling liquid in the best path.
This liquid moves through the inside of the motor from the bottom to the highest. The specially developed cooling channels define the exact path over all warmth sources to discharge the heat successfully and systematically. At the top end, the heat from the liquid is then discharged by way of 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 just a tiny a half of the underwater compressor system, but they are additionally a particularly necessary part. The whole underwater station can’t operate without these motors to drive the pumps. Since first being put in in 2016, these submersible motors have been operating without any faults. All in all, ANDRITZ Ritz delivered three twopole submersible motors with an output of 736 kw. The motor varieties the condensate unit together with the pump and conveys those liquids which are eliminated by the separator upstream of the gasoline compressors.
In 2017, due to a failure in a part of the system which was not supplied by ANDRITZ, the motor was sent in for repairs, throughout which an intensive research was carried out. Thermal distribution in the cooling flow and the new spots had been analyzed in more detail. The outcomes additionally led to the design of a new plate crosssection for the rotor plates.
Because of this, the motor to be repaired was additionally fully overhauled and fitted with a new winding and a new rotor. This study and the implementation of its findings not only benefit the current customer and future customers in this case, but additionally strengthen confidence within the ANDRITZ submersible motor know-how.
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