Lloyd's Register Pioneers Vibration Monitoring Techniques
Lloyd's Register of Shipping has pioneered the use of vibration monitoring of steam turbines as an alternative to the usual practice of dismantling such machinery for visual examination at the time of the first periodical survey.
Apart from the financial benefits to the owner or operator of the ship, there are possible technical advantages in not disturbing a turbine at an early stage in its operating life.
Although Lloyd's Register's Rules have provided for vibration monitoring of steam turbines since 1971, the problem has been to devise satisfactory equipment and methods which would provide information at least equivalent to a visual examination.
Lloyd's Register's Technical Investigation Department has considerable experience in the field of vibration monitoring of marine machinery and, in association with the BP Tanker Co. Ltd., and Denholm Ship Management, has carried out first periodical surveys using this alternative method on the oil tanker British Scientist and the ore/oil carrier Nordic Conqueror.
In the case of the British Scientist, the owners, BP Tanker Co. Ltd., subsequently decided, for other reasons, to open up the turbines, thus affording an opportunity to compare the predicted condition based on vibration analysis with the actual condition determined by visual examination.
The correlation of the results was found to be very good and confirmed that the method used was basically sound, and a viable alternative for surveying steam turbines.
Lloyd's Register agrees to the vibration monitoring method of survey, provided the following conditions are met: 1. The turbines are fitted with rotor position indicators as a permanent feature of the installation.
2. Records of vibration readings obtained during the preceding 12 months are available for analysis.
3. Complete sets of vibration records on the forward and after bearings of each turbine are to be taken during part power and full power sea trials using portable vibration analysis equipment.
The readings at the bearings are to be taken in the horizontal, vertical and axial directions.
4. The arrangements for the operation of the machinery with one turbine out of action are found in order and suitable for being readily fitted in an emergency.
5. The surveyors are fully satisfied from the full power trial that the turbines remain, as far as can be ascertained, in good working order.
6. The turbine rotor bearings, thrust bearings and flexible couplings are to be opened out after completion of the vibration monitoring exercise.
Lloyd's Register surveyors examine the vibration monitoring techniques to be employed, ascertain the vibration characteristics of the main turbines and assess the full power trials.
Lloyd's Register has the necessary technical equipment to carry out vibration measurements aboard ships, and the capability for analyzing the results, using the Society's own minicomputer or real-time analyzer.
Other stories from June 1977 issue
Content
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- Sixth LNG/LPG Meeting Gastech 78 To Be Held Nov. 7-10 In Monte Car page: 4
- Nichols/Pittman/Choate Purchase Cox Interest In Mississippi Marine page: 6
- Japanese Shipbuilders Association Elects Dr. Shinto President page: 6
- Lockheed Shipbuilding Launches First Of Two Sub Tenders Building At Total Cost Of $253 Million page: 7
- Harland And Wolff Building LPG Carriers For Service To U.S. page: 8
- Bethlehem To Reconstruct Four PFEL Ships At Cost Of $5 Million Each page: 8
- Federal Barge Lines Names David Ruffner Manager Eastern Region page: 8
- Newly Formed ASNE Puget Sound Section Holds First Meeting page: 9
- McAllister Adds 4,290-HP Tug To Hampton Roads Fleet page: 9
- Western Gear Corp. Receives $8-Million Contract From Navy page: 10
- Union Mechling Corp. Elects Smail President —Mechling Chairman page: 10
- Model Of National Monument Honoring American Seamen Unveiled On Maritime Day page: 11
- New GE MST-21 9,000-19,000 SHP Steam Turbine Available page: 11
- Research Contracts To Combustion Engineering And Mortada International page: 11
- Hongkong United Dockyards Ltd. Sign Contracts For New Ship Repair Complex page: 12
- LNG-5 . . . Dusseldorf page: 12
- American Bureau Forms Republic Of China Technical Committee page: 13
- Zapata And Dutch Firm To Build And Operate U.S.-Flag Dredges page: 14
- Todd Seattle Lays Keel For Guided Missile Frigate —FFG-10 Is First In A Multi-Ship Navy Program page: 15
- Franz Krautkremer, President Of Schottel, Awarded Medal Of Merit page: 16
- $394,000 Contract To Study Inland Waterways And Gulf Coast Area page: 17
- Sembawang Shipyard Modifies Barges Converted From Tankers page: 18
- N.Y. Propeller Club Elects Hart President page: 19
- $28-Million Contract Awarded To Equitable page: 22
- Louisiana Names Amoss Maritime Man Of The Year page: 23
- Uniflite Receives $1,440,000 Contract For Utility Boats page: 23
- Marland Expanding— Manufacturing Facility Moved To Wisconsin page: 24
- Gulf Mississippi Marine Corp. Awarded Nine-Vessel Contract page: 25
- 260-Foot SEACON Is New Navy Offshore Construction Vessel page: 26
- A.C. Sargent And A.J. Herkes Form Naval Architectural Firm page: 26
- Pacific N.W. Section Hears Paper On Marine Cathodic Protection page: 28
- National Cargo Bureau Reports On '76 Activities page: 29
- Union Mechling Forms Water Analytics Division page: 30
- Design Of A Reheat Turbine page: 31
- BP And Stolt-Nielsen In Shipping Agreement page: 32
- U.S. Steel Orders Colt-Pielstick Engines For Huge Ore Carrier page: 33
- International Paint Announces Promotions And Appointments page: 38
- Raytheon Adopts New Warranty Program page: 38
- Lloyd's Register Pioneers Vibration Monitoring Techniques page: 40
- ABS Forms Republic Of China Technical Committee page: 42
- Modern Wooden Ship — Design And Construction Subject Of SNAME Philadelphia Section Meeting page: 43
- Lockheed Designs Oil Skimmer For Installation In Craft Used In Offshore Cleanup page: 44
- Marathon Introduces Jumbo Bottom-Supported Offshore Platform page: 44
- Seatrain Using Unique Shipbuilding Technique page: 44
- Propulsion Systems, Inc. To Supply Bow Thrusters For Two Ro/Ro Vessels page: 44
- Chairperson Named For Kings Point Museum page: 46
- Dixie Dredge Corp. Appoints James Bishop page: 47
- NYSA And CONASA Reelect James Dickman President page: 47
- Dry Dock Association Elects Massa President page: 50
- Hansen And Tidemann, Inc. Names Mitchell To Head First West Coast Office page: 50
- Delaware Marine Launches Pilot Boat For Port Of Monrovia page: 51
- New Register Shows Ro-Ro Fleet Much Larger page: 51
- Advanced Marine Vehicles Conference Issues Call For Papers page: 52
- ITT Decca Marine Introduces Two New Navigation Aids page: 53
- Singapore Shipbuilders Elect Chua Chor Teck page: 54
- Don McGee Joins Austin Marine, Inc page: 54
- Propulsion Systems, Inc. Appoints John Phinney Engineering Manager page: 55
- World Shipping Statistics 1976 page: 55
- Misener Brochure Describes Facilities At Tampa, Fla. Yard page: 56
- Electro-Nav Names Woolf General Manager San Francisco Office page: 56
- SNAME Los Angeles Section Discusses Use Of Concrete For Marine LNG Tankage page: 56
- San Diego Section Of SNAME Hears Paper On Epoxy Resin Machinery Chocking page: 57
- Raytheon Marine Adds New Series Of Weather Receivers page: 57
- Bethlehem Beaumont To Build Self-Setting Production-Storage Platform For Phillips Petroleum page: 57
- Safety In Marine Applications Course Sponsored By ISA —Washington, D.C., June 27-28 page: 58
- Prudential Installs Fleetwide Preventive Maintenance Program page: 58
- National Cargo Bureau Appoints Captain Gates page: 59
- Maryland Police And United Nations Order Boats From Uniflite page: 60
- Mitsubishi To Convert Sea-Land Containerships page: 61
- Marine Electronics Dealers Establish Reciprocal Service page: 61