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Evolving water quality standards and NPDES (National Pollutant Discharge Elimination System) discharge permit limits demand improved control of water pollutants associated with maintenance of US Navy ships in drydock. During 1992-93 NNSY (Norfolk Naval Shipyard) experienced significant problems in meeting NPDES limits for its drydock discharges ultimately resulting in the issuance of a consent special order by the state of Virginia demanding action to achieve compliance. The problem and the need for standards are described. An extensive effort by NNSY is described to analyse the processes and materials present in drydocks to identify the key potential pollutant sources and to develop the standards procedures process controls and support resources necessary to gain an acceptable level of control over these pollutants. Treatment results are presented. It is hoped that Navy activities and commercial shipbuilders faced with drydock water pollution problems may benefit from a review of NNSY's experience.

A structural health monitoring system for large-scale structures is presented. This has been developed based on FBG (fibre Bragg grating) sensors. The application of this system to US Navy vessels will reduce maintenance ship costs by allowing for the scheduling of need-based maintenance and will increase fleet operational availability and ship survivability by providing ship operators with real-time information concerning the state of the ship structure. Central to the monitoring system is an instrumentation unit capable of detecting signals from hundreds of FBG sensors with sampling rates approaching 2 kHz. The instrumentation is based on SPA's proprietary DSWDM (digital spatial wavelength domain multiplexing) technology. This technology is electro-optics based and has been shown to provide significantly higher sampling rates than comparative FBG interrogation technologies. The prototype HS-FOIS (high speed-fibre optic interrogation system) also possesses a number of advantages intrinsic to optical fibre sensors compared to conventional strain sensor systems. These advantages include extremely low installed weight and volume immunity to electromagnetic interference and corrosive environments and low signal attenuation and drift. The installation and testing of a large-scale fibre optic sensor network on the British Trimaran RV (research vessel) Triton are described. Also detailed are the sensor layout and installation process with emphasis on lessons learned during this procedure. The test procedure and sample data results are presented. Finally conclusions on the presented data and imX31450 A fibre-optic system for downhole monitoring and its future commercialisation R Catherall ; B Bjornstad

This paper recounts the naval engineering victories in preparation conversion maintenance and repair of the diverse technology from three armed services required to win the Falklands War.

Some details are given of a Royal Navy study into maintaining the same operational capability of a frigate with reduced manning. The main study looks at the `whole ship' but this paper concentrates on the work of sub-groups that have been examining the maintenance and operation of the ships' combat system and marine engineering systems.

Gas turbine machinery developed by and for the British Royal Navy is reviewed with discussions on naval requirement design manufacture installation testing trials performance fuel consumption air supply noise reliability maintenance control and operating experience. Projects described include gas turbines for warship main propulsion small boats and landing craft and for auxiliary machinery.

Tbe work of the Overseas Bases Department (OBD) within the Support Projects Organisation of Vosper Thornycraft is described the department was set up to advise overseas governments on dock harbour and maintenance facilities for the special needs of naval and patrol vessels. Several projects have been undertaken ranging from the construction of an entirely new harbour for a maritime defence force to the adaption of existing facilities for a coastguard operation.

The prototype Babcock and Wilcox selectable superheat boiler and auxiliaries developed for the Royal Navy guided missile destroyer HMS Devonshire is described and results of shore trials at the Admiralty fuel experimental station Haslar are reported.

HMS Brecon first Royal Navy Hunt Class Mine Countermeasures Vessel of grp construction is described - design; layout; dimensions; propulsion machinery; electrical installations; mission systems (magnetic acoustic diving navigation); control; maintenance and support. Aspects of the properties usage and fabrication of grp are discussed and significant stages in the development of the vessel considered.

General Electric's range of marine main propulsion geared steam turbines for US Navy combatant ships destroyers cruisers and carriers discussed including - early designs for Mahan class ships; later developments and standardization of design; performance tests; safety features; materials construction manufacture; maintenance in-service experience and vibration control.

Royal Navy experience with problems and failures of bearings in steam turbine driven warship main propulsion systems discussed including; lubrication failure pitting corrosion misalignment excessive loading excessive heat development of electric currents wear wiping and scoring. Aspects of design manufacture installation and maintenance of bearings and their lubrication systems are considered.

A look is taken at the warship of the future from the next class of Future Surface Combatant for the Royal Navy to the ships we might expect to see towards the end of the 21st century. Build and maintenance cycles and manpower are dealt with as well as engineering issues. An attempt is made to indicate that the technology of the future for warship platforms is Integrated Full Electric Propulsion (IFEP). First technological developments are considered. After this manpower is discussed.

The new diesel electric Landing Platform Dock (LPD) HMS Rotterdam of the Royal Netherlands Navy (RNLN) the first NATO vessel above 10000t with full digital diesel-electric ac propulsion has finished the commissioning phase. A user's view is presented on the comparison between design expectations and the experiences with the final electrical system during trials. The propulsion system distribution medium voltage training and operational and maintenance aspects are discussed.

Problems of wave induced vibration in blunt bowed landing craft discussed. Installation adjustment maintenance and sea trials of damped vibration absorbers fitted to LCH (Landing Craft Heavy) vessels of the Royal Navy is described. Ship response with and without the units in calm and roughseas is determined and compared.

This book covers rotating electrical equipment, but the materials and methods of application are applicable in most cases to all types of electrical equipment. It has been prepared to acquaint Navy personnel with high temperature silicone (class H) insulation, now finding its place in the fleet in electrical equipment. Subjects cover insulation theory and basic concepts; classes of insulation and properties of insulating material;, selection of insulating materials and construction of coils, commutators, slip rings and brush holders; apparatus assembly and winding problems; varnish-treating processes, cleaning and drying, tropical service and storage; testing electrical insulation, coils and windings and preventive maintenance programs.

The new HMS Ark Royal has been built by Swan Hunter to be handed over toio the Royal Navy later this year. She has been designed as a 20000t anti-submarine warfare force command ship and is equipped with Sea King helicopters Sea Harrier aircraft and Sea Dart missiles. She can also accommodate a commando unit. Details are given of her overall design; propulsion system by gas turbines; machnery controls; auxiliaries (diesel generators steam boilers flash evaporators air conditioning hot cold and sea water systems); planned maintenance by exchange policy.

The WR-21 intercooled recuperated (ICR) gas turbine under development for the US Navy by a team comprising Westinghouse Rolls-Royce Allied Signal and CAE Electronics has achieved concept and detailed design with rig and model testing and is undergoing full engine system testing. The main features of the machinery which is specifically intended for economic operation in new construction surface combatant ships are discussed with details of: technical specifications operating principles; engine components and construction; required maintenance. A test pro

Symp held in USA Oct 10 - 11 1967 Papers are Saturation diving - a tool for underwater welding and cutting Underwater welding in a dry environment Underwater pipeline welding 110 feet down Underwater welding and painting Problems in deep water tool utilisation Underwater ship maintenance in the Royal Navy divers hand and power tools - research and development in the Admiralty experimental diving unit Diver performance using conventional and power operated hand tools Underwater work tools for scientific diving Velocity power tools A split nut for underwater application Electric tools for diver operation Underwater plasma arc cutting Emergency repairs to underwater pipelines Electron beams as tools for underwater cutting and welding - laboratory tests Deep water metal cutting torch

The concept of naval ship classification under Lloyd's Register Rules and Regulations for the Classification of Naval Ships is described. These rules have been developed to meet the needs of different navies. The approach provides a consistent process for the design procurement construction and through-life maintenance of naval ships. The experience of bringing a number of RAN (Royal Australian Navy) ships into Class under the Naval Ship Rules is described together with the lessons that have been learned and the challenges to be addressed.

Problems of wave induced vibration in blunt bowed landing craft discussed. Installation adjustment maintenance and sea trials of damped vibration absorbers fitted to LCH (Landing Craft Heavy) vessels of the Royal Navy is described. Ship response with and without the units in calm and roughseas is determined and compared.

Engine requirements for fast naval strike craft are seen to include speed endurance reliability and easy maintenance. The response of the GEC Diesel Group Paxman has been to develop the high performance diesel engine ranges Ventura and Valenta. The diesels can be used alone or in diesel/gas turbine or diesel/ electric combinations. Further refinements of diesel engines are the low magnetic signature versions for minehunter vessels.