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Worldwide Largest Agitator Seal Delivered to China

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Worldwide Largest Agitator Seal Delivered to China
Worldwide Largest Agitator Seal Delivered to China
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EagleBurgmann Germany
Postfach 1240
Wolfratshausen, Germany



Press release date: December 1, 2013

For a major project, EagleBurgmann delivered currently the largest agitator seal (480mm shaft size) for use in a new PTA(Pure Terephthalic Acid) Plant in China. The order received from SPX Flow Technology included 13 agitator seals and supply systems. The dimensions and weight of the 1,500 kg mechanical seal presented new challenges to the agitator OEM and the engineers in Assembly and Trials. The agitator has a top entry drive capacity of 2,800 kW and weighs 84 tons, with the gear weighing around 20 tons.

After a construction and production time of merely 20 weeks, the agitator seal was tested in the presence of representatives from the agitator OEM and Enduser customers at the modern EagleBurgmann agitator test facility equipped with sophisticated control and instrumentation technology as well as accurate measured data acquisition. The seal was operated with a rotational speed of 58 revolutions per minutes. The cooling flange was heated to 80C to simulate the heat transferred by the product. "The seal exhibited no abnormalities during the test run. All measured temperatures remained 'in the green'," said EagleBurgmann's Sales Engineer Peter Totzauer. The test run ended after an operating time of 100 hours. After a cooling down phase, the seal was dismantled in the presence of inspectors so that they could jointly examine the sliding surfaces and other components. All of the participants and the construction, research and development specialists confirmed that the test run had been more than successful and that there would be no obstacles to a smooth and continuous permanent operation. The operator of the plant expects a two-year operating period without interruptions. Continuous availability of the seal is an absolutely vital criterion because it is deployed in the crystallizer, which is the heart of the system.

PTA is a pre-product of polyester that is used in great amounts to manufacture textiles (90%) and PET bottles. The continually increasing need for PTA demands ever greater capacities.

An overview of the features:
- Shaft diameter 480 mm
- Double seal for the medium pressure range
- Hydraulically balanced
- For top entry drive
- Bi-directional
- Ready for assembly cartridge type
- Integrated radial bearings
- Self-closing on the product side
- Integrated cooling flange and cooled housing
- Metallic materials in titanium executed on the product side

Materials
- Rotating seal faces: Carbon graphite
- Stationary seats: Silicon carbide
- Secondary seals of perfluorocarbon rubber (K) and fluorocarbon rubber (V)

EagleBurgmann - Rely on Excellence: EagleBurgmann is among the internationally leading providers of industrial sealing technology. Its products are used in applications wherever safety, efficiency and reliability are essential considerations: for example in the oil gas, refinery, chemical, energy, food processing, paper, water, marine, aerospace and mining industries. With their ideas, solutions and commitment, around 6,000 employees at over 70 subsidiaries ensure every day that customers throughout the world can rely on EagleBurgmann seals. The modular TotalSealCare service reinforces the corporate group's commitment to its customers and offers tailored solutions for any situation.

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