Andritz’s submersible motor know-how success

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 gas. From water bottles to the insulation in our properties, natural gas is a key ingredient in just about each product we use every day. According to the latest report issued by the International Gas Union (IGU) in 2019, the global demand in fuel has been rising by 35% of the past decade alone.
The causes for this development are manifold, however the IGU determines three primary components. First, the price competitiveness of gas in contrast to other vitality sources. Secondly, larger security of supply with regard to infrastructure, delivery, and flexible use. Thirdly, gasoline represents a sustainable form of energy that may mitigate local weather change and lower localized air pollution. It has 50% fewer CO2 emissions compared to coal, for instance.
In order to satisfy this rising demand and use, the eco-friendly potential fuel should be extracted utilizing a sustainable course of. One of the most important systems is the Åsgard oil and fuel field on the Haltenbanken, 200 km off the coast of Norway. It contains 52 wells mixed in 16 fuel fields and connected 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 commonplace cubic meters of oil equal of fuel.
The system used comprises three important areas: Åsgard A, B, and C. Åsgard A is a floating oil manufacturing vessel that has been anchored there completely since extraction started in 1999. Åsgard B is a floating, semi-submersible gas 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 complicated to the north of Stavanger, Norway.
First in the world Aker Solutions ASA has been supporting the Åsgard gas field with various fuel area merchandise, methods, and providers 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 so as to improve the output to 306 million barrels. These are normally installed on platforms above sea degree.
However, Åsgard is based on an underwater system. By using 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 reliable than a platform. The Åsgard system consists of modules for 2 similar sets of compressors, pumps, scrubbers, and coolers. The motors wanted to drive the pumps come from ANDRITZ.
Small, however important
In 2010, Ritz Pumpenfabrik GmbH in Schwäbisch-Gmünd, Germany, became ANDRITZ Ritz GmbH and a 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 properly pumps, backside intake pumps, suction pumps, seawater pumps, and underwater machinery.
Depending on the realm of utility, the motors can be made from forged iron, bronze or completely different kind 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 inside permanent magnet motor technology, or IPM for short, these maintenance-free motors can achieve impressive outputs, efficiencies and, consequently, price savings.
The efficient and measurable motor cooling system keeps the inside temp- erature as low as attainable. 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 delivery is mounted on the decrease shaft finish of the rotor. One of its two primary duties is cooling and lubricating the nearby thrust bearing. By doing so, the impeller ensures there is a constant circulate of cooling liquid in the proper direction.
Free moves by way of the inside of the motor from the underside to the top. The specially developed cooling channels outline the precise path over all warmth sources to discharge the warmth effectively and systematically. At the highest finish, the heat from the liquid is then discharged via 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 only a tiny a half of the underwater compressor system, however they’re additionally an extremely essential part. 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 with none faults. All in all, ANDRITZ Ritz delivered three twopole submersible motors with an output of 736 kw. The motor types the condensate unit along with the pump and conveys these liquids which may be removed by the separator upstream of the gas compressors.
In 2017, because of a failure in a part of the system which was not provided by ANDRITZ, the motor was sent in for repairs, during which an extensive research was performed. Thermal distribution in the cooling flow and the hot spots have been analyzed in more element. The outcomes also led to the design of a brand new plate crosssection for the rotor plates.
Because of this, the motor to be repaired was also completely overhauled and fitted with a brand new winding and a new rotor. This research and the implementation of its findings not solely benefit the present customer and future clients on this case, but also strengthen confidence within the ANDRITZ submersible motor technology.
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