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 impressive outcomes.
We are surrounded by gasoline. From water bottles to the insulation in our homes, natural gas is a key ingredient in just about every product we use every 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 past decade alone.
The reasons for this pattern are manifold, however the IGU determines three main elements. First, the price competitiveness of gas in contrast to different vitality sources. Secondly, higher safety of supply with regard to infrastructure, supply, and versatile use. Thirdly, gas represents a sustainable form of vitality that may mitigate local weather change and lower localized air pollution. It has 50% fewer CO2 emissions compared to coal, for example.
In order to satisfy this rising demand and use, the eco-friendly potential gas must be extracted using a sustainable process. One of the biggest techniques is the Åsgard oil and gasoline area on the Haltenbanken, 200 km off the coast of Norway. It incorporates 52 wells combined in sixteen gas fields and connected by 300 km of oil pipelines. As of December 2018, the sphere has estimated assets of 9.9 million commonplace cubic meters of oil equivalent of oil and 51.1 million standard cubic meters of oil equal of gas.
The system used contains three essential areas: Åsgard A, B, and C. Åsgard A is a floating oil manufacturing vessel that has been anchored there permanently since extraction started in 1999. Åsgard B is a floating, semi-submersible gasoline and condensate processing platform for processing and stabilizing of gasoline 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 complicated to the north of Stavanger, Norway.
First on the planet Aker Solutions ASA has been supporting the Åsgard gas area with various gasoline area products, techniques, and providers since 2010. In เกจอาร์กอน , the pressure 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 so as to improve the output to 306 million barrels. These are normally installed on platforms above sea degree.
However, Åsgard relies on an underwater system. By utilizing compressors on the seabed the recovery charges are improved and the investment and working prices are lowered. In addition, underwater compression leaves a smaller ecological footprint and is more dependable than a platform. The Åsgard system consists of modules for two equivalent 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, 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 suitable for driving deep properly pumps, bottom consumption pumps, suction pumps, seawater pumps, and underwater machinery.
Depending on the realm of application, the motors may be manufactured from forged iron, bronze or different sort of chrome steel and put in either 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 achieve spectacular outputs, efficiencies and, as a result, cost savings.
The efficient and measurable motor cooling system retains the interior temp- erature as low as possible. Drinking water is used as a cooling liquid, which is why the motors can operate in media of as much as 75° C. An impeller with optimized suction and delivery is mounted at the decrease shaft finish of the rotor. One of its two main duties is cooling and lubricating the close by thrust bearing. By doing so, the impeller ensures there is a constant flow of cooling liquid in the right course.
This liquid strikes through the within of the motor from the bottom to the top. The specifically developed cooling channels define the precise path over all heat sources to discharge the heat successfully and systematically. At the highest finish, the heat from the liquid is then discharged by way of the motor’s outer wall. Here, it is transferred through 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, however they’re additionally a particularly important half. The whole underwater station can’t function without these motors to drive the pumps. Since first being installed 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 forms the condensate unit together with the pump and conveys those liquids which would possibly be removed by the separator upstream of the fuel compressors.
In 2017, because of a failure in a part of the system which was not supplied by ANDRITZ, the motor was sent in for repairs, throughout which an extensive examine was performed. Thermal distribution in the cooling circulate and the new spots had been analyzed in more element. The results additionally led to the design of a 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 brand new rotor. This examine and the implementation of its findings not solely benefit the current buyer and future prospects in this case, but in addition strengthen confidence in the ANDRITZ submersible motor technology.

Scroll to Top