The following new paragraph is added, "Where electrical power is necessary to restore propulsion, the capacity shall be sufficient to restore propulsion to the ship in conjunction with other machinery, as appropriate, from a dead ship condition within 30 min. after blackout".
The "dead ship condition" means that all energy for starting the main engine has been lost.
In case of starting the main generator by compressed air prior to starting the main engine, it is necessary to consider that the capacity of the emergency generator shall be sufficient to run the air compressor.
References
1) Taiyo Electric Mfg. Co., Ltd.： Technical document and data of electric propulsion system
2) Yokoyama： Journal of the M.E.S.J. Vol. 32, No. 9 (1997)
3) Terasaki Electric Co., Ltd.： Catalogs
4) Japan Radio & Electric Mfg. Co., Ltd.： Catalogs
[Naohiko YOKOYAMA]
14. Ocean Engineering Machinery and Offshore Structures
New buildings, order award and future trends are shown in each field as follows.
14.1 Offshore oil field development
Order for new buildings of drilling rigs have been mostly ceased for long time in the world-wide market, but many orders for building new rigs was placed in 1997, and showing activity like a "Mini-boom". According to advance in technology for development of deep water oil fields in Gulf of Mexico and in Brazil, many ship type drilling rigs, which are capable to drill at deep water, were ordered. (Ref. Table 14.1) Also Hitachi Zosen Corporation received an order of a semi- submersible rig last year, and this semi-sub rig of fifth-generation type is now under construction. Other than new buildings, conversion of a semi-submersible barge into a drilling rig and conversion of a tanker to a drill ship are under construction.
Also, many ships are converted into FPSO or FSO which will be oil production units. A FPSO of Tentech 700 design is now under construction at Chiba Yard of Mitsui Engineering and Shipbuilding Co. The FPSO of Tentech 900 design, which was under construction at Hitachi Zosen Corporation, has been delivered to Statoil also.
Many inquiries and many order were placed in the world, but domestic shipbuilding companies had high back log of merchant ships, and only a few orders on offshore projects were received by domestic shipbuilding companies.
14.2 Ocean energy
A floating unit "Mighty Whale" for wave energy absorption was built by Ishikawajimaharima Heavy Industries Co., and will be installed off the Gokasho Bay in Mie prefecture in 1998. A test in actual ocean environment is scheduled, and the unit will be installed for two years, and its durability, safety and economics will be checked.
14.3 Ocean Organic Resources development
Kawasaki Heavy Industries is building a floating-fish-living-space made of steel. The aim of this floating unit is to feed and keep fishes like tuna or bonito around the unit, and create a fishery area. The unit will be moored by a single point catenary mooring at water depth of about 900 m to 1,100 m.
14.4 Ocean space utilization
Considering the utilization of a ultra-large-floating-structure as an airport, experiments using a floating structure model have been continued from 1995 to 1997. The experiment was carried out off Oppama Shipyard of Sumitomo Heavy Industries, and the location was between a shipyard's wharf and a sea berth for wave dissipation.
