Railway Drydocks Designed By Crandall Recently Completed And Now In Operation
The construction of three modern, highly efficient, low-cost marine railway drydocks designed by Crandall Dry Dock Engineers, starting with the 4,000-ton railway at Jacksonville, Fla., followed by a 3,000-ton at Pago Pago, American Samoa, then another of 4,000-ton-capacity at Punta Arenas, Chile, and finally the enlargement of the railway drydock at Pictou, Nova Scotia from 2,000 to 3,000 tons, demonstrates the acceptance by shipyards of the durability, reliability and economy of railways, especially when their modern design is found quite acceptable to the environmental authorities. Also, U.S.
naval authorities have granted 100 percent of their commercial capacity in their certifications of these.
The railway drydock, due to its extensive underwater track, is limited in most shipyard sites as to size and capacity, but when a virgin site is chosen whose open water space is not limiting, they can be economically built up to 10,000 tons. This is the situation at Atlantic Dry Dock, Dartmouth Marine Slips and Pictou Industries where deep water was available just offshore.
Today, there are several engineering developments making the larger railways more attractive.
1. Welded chain with a factor of safety of 4 can be produced in either class 3 quality or the new class 4 quality, making it possible to haul 4,000- to 5,000-ton ships with only two chains versus the old four-chain and six-chain docks using cast steel chains.
2. New two-way steel track, fabricated in sections 40 to 60 feet long and supported on highcapacity steel piles lends itself much better to heavy waterfront construction methods and the finished product is free from marine borer attack and, with proper paint, is very durable under water.
The well-proven transfer systems adjacent to the cradles enable shipyards to use their transfer area for long duration repairs or new vesself construction at a very modest cost and the system does not require a wasteful cross-transfer area when real estate is at a premium.
In spite of its perception as an old type drydock, the railway of today is a modern, welldesigned and constructed facility. It can be made with declivities that suit natural shore conditions and has a superb record of safety in that the vessel is supported at all times and survives remarkably even when overloaded, neglected and abused. Its inherent durability in the harsh environment of the sea makes it very attractive in its capacity range of 100 to 10,000 tons.
For free literature giving complete information on Crandall Dry Dock Engines, Circle 50 on Reader Service Card
Other stories from January 1988 issue
- Parker Hannifin To Acquire Gull Inc. page: 5
- Marine Machinery Association Reports On Defense Mobilization Base Forum page: 6
- ITW Philadelphia Resins Offers Bulletin On Repair Compounds And Adhesives page: 7
- Free Literature Package On Port Equipment Offered By Westmont Industries page: 8
- Cruise Ship Construction Boom page: 8
- CRUISE SHIPPING 88 page: 10
- Dampa Awarded Contract To Furnish Joiner Systems page: 11
- Commander Bearings Offer Excellent Performance In Harsh Environments page: 12
- Transformation Of S.S. Monterey Into Luxury Cruise Liner Underway At Wartsila-Helsinki page: 12
- Krupp MaK Offers 28-Page Brochure On Dicare Engine Diagnosis System page: 12
- A. Edward Owen Named President And CEO, ZF Of North America page: 13
- Edger Named President Of Jered Brown Brothers page: 14
- Saab Offers N ew User Friendly System To Load And Discharge Tankers page: 14
- Free 46-Page Booklet Offered On xFlex' Electric Power Tools page: 15
- OUTSTANDING PASSENGER VESSELS OF 1987 page: 16
- OUTSTANDING WORKBOATS & MILITARY SHALLOW-DRAFT VESSELS OF 1987 page: 26
- 1988 NAPVO Annual Convention Washington, D.C., January 10-15 page: 36
- MMC Offers Free Literature On Improved xFlexi-Dip' Portable Electronic Tape page: 38
- PME Offers Eight-Page Brochure On Babbitt Bearing Repair Service page: 39
- Megasystems Introduces New Product—DOT / / PC page: 39
- The Repowering Of QE2— The Largest Diesel Power Station Afloat page: 40
- Parker Offers Literature On New General Purpose Packless, Bellows Valves page: 42
- ZF Of North America Introduces ZF-FPM IRM-350 Marine Gear page: 42
- S.P. Radio Introduces New Low-Cost, High-Quality Compact Radiotelephone page: 42
- Organizational Changes At Wagner Company page: 43
- Railway Drydocks Designed By Crandall Recently Completed And Now In Operation page: 44
- Knut Kloster Project To Build $800-Million Cruise Ship Close To Becoming Reality page: 45
- SPD Technologies Develops New Advanced Computerized Battery Monitoring System page: 45
- Literature Available On New IMO® Screw Pump page: 46
- Hitachi Zosen Delivers 48,000-Gross-Ton Car Carrier Overseas Joyce page: 50
- TTS Installs Wartsila Computer-Assisted Manufacturing System page: 51
- Furuno Introduces New Compact VHF Radiotelephone And LP-1000 Loran/Plotter page: 52
- Moss Point Acquisition By Trinity Will Consolidate Shipbuilding Functions, Improve Efficiency page: 52
- Parker Hannifin Offers Free Literature On Union Bonnet Valves page: 53
- Sea-Tex Introduces New Color Video Tract Plotter page: 54
- Repowering Of San Francisco Ferries With Detroit Diesel Engines Cuts Fuel Costs, Adds Performance page: 55
- Government To Charge Cruise Lines For Sanitary Inspections page: 56
- New Harris HF-SSB Radio Offers Operating Simplicity page: 56
- World's Largest Aluminum Crewboat Features Five Cummins Engines page: 57
- Enrollment Open For Outside Plant Telecom Corrosion Testing Course page: 57
- Miller Electric Offers The Legend AEAD-200LE Welding Generator page: 58
- Arneson Marine Relocates Eastern Regional Office To North Miami Beach, Fla. page: 59
- Schottel Rudderpropeller Systems Provide Excellent Maneuverability For New Class Of RO/RO Ferries page: 60
- Powerful Docking Tug Delivered By Gladding-Hearn Shipbuilding page: 63