Site: Rauma Oceanics Ltd.
P.O. Box 610
Lokomonkatu 21
SF-33101 Tampere

Date Visited: May 17, 1993

Report Author: A. Kalvaitis



A. Kalvaitis
N. Caplan
M. Lee


Seppo Seppala; President
Jari Lind; Product Manager, CAE Services


Rauma Oceanics Ltd. is a subsidiary of Rauma Oy. The Rauma Group is one of three industrial groups that form Repola Corporation, Finland's largest conglomerate. The Repola Corporation employs 28,000 people with sales of $4.7 billion. Major product lines include timber harvesting and related equipment, fiber processing plants, soils crushing equipment, and specialty products relating to environmental technology. Rauma's expertise in undersea technology began in 1979 with the manufacture of controllable pitch propellers, offshore cranes, and subsea blow-out prevention systems. Its present main programs concentrate on submersibles and hyperbaric systems, including air independent underwater waves packs. In the submersible area, Rauma was responsible for the design, fabrication, and testing of the two Mir class 6,000 m depth capable research submersibles that were delivered to the former Soviet Union in December 1987. Rauma employs over 100 people and has sales of about $30 million.


The WTEC team was given presentations on the company's capabilities by Mr. Seppo Seppala, president, and Mr. Jari Lind, product manager.

Rauma has broad expertise in various undersea and high pressure areas from design through construction. The company has manufactured two deep submersibles (6,000 m) and a 300 m diver lock-out submersible. Rauma has also developed buoyancy materials, ballast pumps, a seawater hydraulic pump, and battery packages. Other specialty designs have included a hyperbaric welding spread, a deep ocean corer, decompression chambers, and hyperbaric simulators.

Rauma Oceanics has broad expertise in maraging type ultra-high strength steels that were used as pressure hull materials for the Mir research submersibles. Maraging steels offer superior strength/weight ratios compared to titanium, and since collars for viewports are integrally cast with the pressure hull, large diameter viewports are possible. The company could readily build full ocean depth systems if there was a market demand.

Rauma's design capabilities are based on computer aided engineering. This includes a 3-D layout design of complete systems and assemblies, geometry from a 3-D model database, dimension drawings for manufacture, finite element analysis, and the documentation processes. The design software codes (CATIA, VERTEX, IGBS, CAEDS, ANSYS) were also described. Other undersea developments include a 7,000 ft, 22 pound/ft3 syntactic foam using special microballoons and a 6,000 m rescue device for submersibles. The team was also given a short tour that focused on the company's DLO-300 diver lock-out submersible.

An interesting innovation has been an air independent power system (AIP) that is pressure compensated and can be used in depths to 6,000 m. Rauma's RDP-100 power pack, an autonomous Rankine engine, has been successfully used in an autonomous vehicle. The normal power is up to 50 kW with virtually unlimited operating time. The Rankine engine is very reliable because there are few moving components. Rauma designed the special bearings for the turbine. The system weight is 950 kg without fuel. Efficiencies of 30 percent have been achieved. AIP could have broad applications in special ROVs, deep-sea research stations, and submersibles.

Rauma also has test capabilities that include a 2.5 m diameter, 6.0 m high, and 7,500 m equivalent pressure tank, and a 4 m diameter, 12 m high, and 1,000 m pressure tank. Det Norske Veritas (DNV) has provided Rauma Oceanics with an umbrella certification.

In summary, Rauma Oceanics is a leader in maraging steel construction and has capabilities in other undersea technologies. The Mir submersibles are well-designed deep ocean vehicles and represent 40 percent of the world's manned diving capability to 6,000 m.


DLO - 300 Diver Lock-Out Submersible.


Air Independent Power Pack. Brochure.

Computer-Aided Engineering. Brochure.

Rauma Oceanics. Brochure.

Hyperbaric Training Semester. Brochure.

HBO Medical Treatment Chamber. Brochure.

Rauma 1992 Annual Report.

Drass - A Rauma Subsidiary. Brochure.

Galeazzi. Brochure.

Published: June 1994; WTEC Hyper-Librarian