| 2 | 2010 - Schiff & Hafen

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SHIPBUILDING & EQUIPMENT | PIPING SYSTEMS Tungum-tube pipework for offshore construction ANTI-CORROSIVE TECHNO- LOGY | Tungum is an Aluminium-Nickel-Silicon-Brass alloy which was fi rst discovered by metallurgist Sidney Tungay in the 1920’s trying to fi nd a decorative alloy resembling of 22 carat gold when polished. This copper based alloy has, in fact, excellent qualities to be used for pipework, especially for offshore applications. Tungum alloy is a cryogenic material, suitable for chemical engineering and low temperature processes. Its corrosion resistance often enables its use in conveying fl uids and gasses containing corrosive elements. Highly resistant to sea water and its atmosphere, Tungum resists both stress and crevice corrosion to offer outstanding serviceability, even at intermittent duty in the highly corrosive ‘splash’ zone. Non-magnetic and non-sparking properties make Tungum invaluable in piping high pressure gases, particularly oxygen where its thermal conductivity/ defusivity characteristics virtually eliminate the potential dangers present when lesser materials are employed. In salt-laden marine atmospheres, ‘316’ stainless steel is highly susceptible to crevice corrosion and chloride pitting. After just a few years of salt 40 Ship & Offshore | <strong>2010</strong> | N o 2 Tungum pipes are installed on Toisa Paladin Photo: Sealion Shipping Ltd. spray exposure, it may still look bright from a distance, but closer inspection reveals telltale signs of imminent failure to hold pressure. Tungum alloy, however, possesses a natural protection mechanism whereby, on exposure to salt spray, a very thin oxide coating is generated over the exposed surface, no more than two thousandths of an inch thick, when complete. The tube becomes discoloured, it may even have a verdigris coating, but under the oxide layer the tube material is perfect and will remain so for a very long time. Tungum Alloy tube remains unscathed despite more than 10 years of marine exposure on a semi-submersible support vessel. In comparison, the stainless steel section from a southern North Sea gas platform, shows both crevice corrosion and chloride pitting after barely fi ve years in the same environment, in lines under pipe clamps. The special corrosion resisting characteristics of Tungum alloy tubing, carefully developed for use in the hydraulics systems of marine aircraft remains just as valid in today’s polluted sea waters. An examination of the development of the oxide coating shows time plotted against a minute weight loss during its formation. After 1000 hours the weight has virtually stabilised indicating that the protective coating is already almost complete. The strength to weight ratio of Tungum alloy compares favourably with other materials. In tubes, this often affords the opportunity to employ smaller, lighter sections, hence reducing the size and cost of fi ttings and supports. As would be expected of a material originally developed for use in the hydraulic control systems of aircraft, Tungum alloy has excellent fatigue resisting properties. In practice, tubing is often used after bending. In this operation the outer wall of the tube becomes thinner and the inner wall thicker. The severity of this depends on the radius of curvature and the angle encompassed by the bend. The tube also becomes oval due to the forming operations. The radius of the bend, the angle of the bend, the ovality of the tube and obviously properties of the tubing material, all infl uence its fatigue life. The relationship between the maximum stress, calculated for straight and circular Tungum alloy tubing, and the number of stress repetitions to cause failure is shown below. Although initially more expensive than stainless steel, the proven life expectancy of Tungum make the long-term operating costs far more attractive, not to mention the costs involved in rig shut down and ‘old’ tube disposal. Jens Olberts, Sales Manager MGI-Imhäuser GmbH, Olpe, Germany
All-electric tube bending UNISON | A new class of tube bending applications is made possible by the launch of allelectric benders for handling tubing diameters of up to 175 mm (7 inches), from the machine innovator Unison. The company‘s newly-extended all-electric tube bending machinery range brings the process fl exibility of software-controlled set-up and bending to a large range of heavy-duty applications. Machines from the Unison Breeze family can now generate bending torques as high as 165,000 Nm/121,698 pound feet. Breeze 170 machines open up new application possibilities for shipbuilding companies. The ability to accommodate 175 mm (7 inches) diameter tubing makes it particularly suitable for handling light- weight high-strength ducting manufactured from specialist materials. Fast, softwarecontrolled set-up enables the Breeze 170 to handle batch sizes as small as one in a very effi cient manner. The new large diameter capability is already being proven in the fi eld, with one of the latest Unison machines recently entering service in an aerospace manufacturing facility, and a second machine currently being built to support naval shipbuilding. All-electric machines are said to have become preferred over hydraulic actuation in tube bending applications involving precision shaping, exotic alloy materials, or small batch sizes. In addition to launching larger machines, Unison is releasing a new generation of its Unibend Unison Breeze, generating a bending torques of 165,000 Nm Control Software, which the company believes delivers the most versatile tube-bending capability available. Among new software features are an intui- tive graphical user interface and a simple bending simulation facility to help users develop collision-free programs for the most complex part shapes. �� The new STRAUB-FIRE-FENCE shields from fire with its innovative and patented design and at the same time keeps all advantages of a STRAUB coupling. In the event of a fire, the intumeszente fire protection coating expands, protectively enclosing the coupling – without any limitations in functionality. Approved, space-saving, crush resistant and light. �� More information from: Straub Werke AG, CH-7323 Wangs, Switzerland Tel. +41 (0) 81 725 41 00, www.straub.ch, straub@straub.ch www.quint.ag
Page 1 and 2: MARCH APRIL | 2 | 2010 www.shipando
Page 3 and 4: Leon Schulz M.Sc. Managing Editor M
Page 5 and 6: � Offshore & Marine Technology Oi
Page 7 and 8: New shipyard in Brazil Planned yard
Page 9 and 10: The next 14,000 TEU carrier will be
Page 11 and 12: Fig. 2: Strut and headbox support 2
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Page 15 and 16: Olympic Hera, sister vessel of Olym
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Page 20 and 21: OFFSHORE & MARINE TECHNOLOGY | OIL
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Page 28 and 29: SHIPBUILDING & EQUIPMENT | PROPULSI
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Page 42 and 43: SHIPBUILDING & EQUIPMENT | INDUSTRY
Page 44 and 45: NEW SHIPS Builders: Daewoo Shipbuil
Page 46 and 47: Ship&Offshore Buyer´s Guide II 1 S
Page 48 and 49: Ship&Offshore Buyer´s Guide IV 3.0
Page 50 and 51: Ship&Offshore Buyer´s Guide VI 6.0
Page 52 and 53: Ship&Offshore Buyer´s Guide 11.03
Page 54 and 55: SHIPPING & SHIP OPERATION | TRENDS
Page 56 and 57: SHIP & PORT OPERATION | TRENDS / CL
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Page 62 and 63: SHIP & PORT OPERATION | NAVIGATION
Page 64 and 65: keeping the course 7 - 10 sept 2010
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Page 68 and 69: Georg Fischer Piping Systems AG CH-

| 2 | 2010 - Schiff & Hafen

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