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 gasoline. From water bottles to the insulation in our homes, pure gas is a key ingredient in just about every product we use every day. According to the latest report issued by the International Gas Union (IGU) in 2019, the global demand in gasoline has been rising by 35% of the previous decade alone.
The reasons for this development are manifold, however the IGU determines three primary components. First, the cost competitiveness of gasoline in contrast to different vitality sources. Secondly, higher safety of supply with regard to infrastructure, delivery, and flexible use. Thirdly, gasoline represents a sustainable form of power that can mitigate local weather change and decrease localized pollution. It has 50% fewer CO2 emissions in comparison with coal, for instance.
In order to fulfill this growing demand and use, the eco-friendly potential gasoline should be extracted utilizing a sustainable process. One of the largest techniques is the Åsgard oil and gas field on the Haltenbanken, 200 km off the coast of Norway. It contains fifty two wells combined in 16 gas fields and connected by 300 km of oil pipelines. As of December 2018, the field has estimated resources of 9.9 million normal cubic meters of oil equal 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 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 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 advanced to the north of Stavanger, Norway.
First in the world Aker Solutions ASA has been supporting the Åsgard gasoline subject with various fuel subject merchandise, techniques, and companies since 2010. In time, the strain within the storage facility in gas-producing fields drops. Compressors are wanted to maintain 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 usually put in 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 dependable than a platform. The Åsgard system consists of modules for 2 equivalent units of compressors, pumps, scrubbers, and coolers. diaphragm seal wanted to drive the pumps come from ANDRITZ.
Small, however essential

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 suitable for driving deep nicely pumps, bottom consumption pumps, suction pumps, seawater pumps, and underwater equipment.
Depending on the world of software, the motors may be made of cast iron, bronze or completely different kind of stainless steel and installed either vertically or horizontally. pressure gauge 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 everlasting magnet motor know-how, or IPM for short, these maintenance-free motors can obtain impressive outputs, efficiencies and, in consequence, price financial savings.
The efficient and measurable motor cooling system keeps the inside temp- erature as little 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 supply is mounted on the lower shaft finish of the rotor. One of its two major tasks is cooling and lubricating the nearby thrust bearing. By doing so, the impeller ensures there’s a constant flow of cooling liquid in the right course.
This liquid moves via the within of the motor from the bottom to the top. The specifically developed cooling channels outline the exact path over all warmth sources to discharge the heat successfully and systematically. At the highest finish, the heat from the liquid is then discharged through the motor’s outer wall. Here, it’s transferred through 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, however they’re additionally an especially essential half. The whole underwater station can not operate with out these motors to drive the pumps. Since first being installed 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 these liquids that are removed by the separator upstream of the gas compressors.
In 2017, because of a failure in part of the system which was not equipped by ANDRITZ, the motor was sent in for repairs, throughout which an intensive research was conducted. Thermal distribution within the cooling move and the hot spots have been analyzed in additional detail. The outcomes also 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 model new winding and a new rotor. This examine and the implementation of its findings not only benefit the current customer and future clients in this case, but also strengthen confidence in the ANDRITZ submersible motor know-how.