Andritz’s submersible motor technology 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 impressive outcomes.
Authoritative are surrounded by gasoline. From water bottles to the insulation in our houses, natural gas is a key ingredient in just about each product we use day by day. According to the most recent report issued by the International Gas Union (IGU) in 2019, the worldwide demand in fuel has been rising by 35% of the previous decade alone.
The reasons for this trend are manifold, but the IGU determines three main factors. First, the cost competitiveness of fuel in distinction to other vitality sources. Secondly, greater safety of supply with regard to infrastructure, supply, and flexible use. Thirdly, gasoline represents a sustainable form of power that may mitigate local weather change and lower localized pollution. It has 50% fewer CO2 emissions compared to coal, for example.
In order to satisfy this growing demand and use, the eco-friendly potential gas should be extracted using a sustainable course of. One of the most important methods is the Åsgard oil and gas area on the Haltenbanken, 200 km off the coast of Norway. It incorporates fifty two wells mixed in 16 gasoline fields and linked by 300 km of oil pipelines. As of December 2018, the sector has estimated resources of 9.9 million standard cubic meters of oil equivalent of oil and 51.1 million standard cubic meters of oil equivalent of gas.
The system used comprises three important areas: Åsgard A, B, and C. Åsgard A is a floating oil production vessel that has been anchored there permanently since extraction started 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 field with varied fuel area products, methods, and companies since 2010. In time, the stress in 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 in order to improve the output to 306 million barrels. These are usually put in on platforms above sea degree.
However, Åsgard is based on an underwater system. By utilizing compressors on the seabed the recovery rates are improved and the funding and operating prices are decreased. In addition, underwater compression leaves a smaller ecological footprint and is more reliable than a platform. The Åsgard system consists of modules for two similar units 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, turned ANDRITZ Ritz GmbH and a part of the ANDRITZ Group, as did the manufacturing of submersible motors. Due to the renewable winding, ANDRITZ submersible motors are appropriate for driving deep properly pumps, bottom consumption pumps, suction pumps, seawater pumps, and underwater equipment.
Depending on the world of software, the motors could be made from forged iron, bronze or different type of stainless 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 special 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, value savings.
The efficient and measurable motor cooling system keeps the inside temp- erature as low as potential. 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 decrease shaft end 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 course.
This liquid strikes through the within of the motor from the underside to the highest. The specially developed cooling channels define the exact path over all heat sources to discharge the warmth successfully and systematically. At the top finish, the heat from the liquid is then discharged by way of the motor’s outer wall. Here, it’s transferred via the surface of the motor to the medium to be pumped.
The ANDRITZ submersible motors are just a tiny part of the underwater compressor system, but they are additionally a particularly important half. The entire underwater station can not function without these motors to drive the pumps. Since first being put in in 2016, these submersible motors have been working without any 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 those liquids which might be removed by the separator upstream of the gasoline compressors.
In 2017, as a end result of a failure in a half of the system which was not supplied by ANDRITZ, the motor was despatched in for repairs, throughout which an intensive research was performed. Thermal distribution within the cooling move and the hot spots have been analyzed in additional element. Quick led to the design of a new plate crosssection for the rotor plates.
Because of this, the motor to be repaired was also completely overhauled and fitted with a model new winding and a new rotor. This research and the implementation of its findings not only profit the present customer and future prospects in this case, but also strengthen confidence in the ANDRITZ submersible motor technology.
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