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Marine & Floating Plant Newsletter Abrasion Resistance Plate & Pipe The dredging industry is a mainte- nance intensive environment. We are constantly on the lookout for new technologies, processes, and materials that will reduce maintenance and increase the durability of the components that the Corps fleet consumes in the field. This article sum- marizes some of the ad- vancements made in the area of abrasion resistant materials applicable to the dredging industry and provides links to those products. Cross-Linked Polyethylene Pipe (PEX) is formed from HDPE into tubing, but contains cross-linked bonds in the polymer structure, changing the thermoplastic to a ther- moset (the entire pipe is one big molecule). Both the low and high temperature properties of the polymer are improved as are chemical resistance, impact and tensile strength, abrasion resistance, and resis- tance to brittle fracture. Cur- rently it is only available up to 20”. For more information visit www.pexgol.com or www.castart.nl. Super C and TriBraze are both registered trademarks of Kenna- metal Tricon Metals & Services, Inc. TriBraze is a quenched and tem- pered, thru-hardened, high impact, superior abrasion resistant alloy steel. Super-C is a com- posite plate consisting of a low carbon steel base plate and an alloyed super wear resis- tant cladding. The base plate enables the plate to be welded, bolted or studded to existing structures, while the cladding provides a premier wear surface capable of working in the most hostile environments. More products to come. Stay tuned. Caption describing pic- ture or graphic. Environmental Update MDC recently attended the 2012 Marine Log Global Green Ship Conference and Expo in Washing- ton, D.C. to become familiar with new developments in environ- mental technology for the maritime industry. Since LNG is very abundant, clean burning, and low cost, it was the topic of a discussion panel: Bring- ing LNG-fueled vessels to the U.S. Market. The panel consisted of members from ABS, USCG, Wart- sila, and TY Offshore. Several hurdles need to be over- come. One major obstacle is that the LNG fuel infrastruc- ture does not exist on U.S. waterways. Mr. Nuss (TY Offshore) presented an off- shore supply vessel that they are currently building for Harvey Gulf. The vessel will be powered by an LNG fu- eled diesel electric plant. Harvey Gulf has lined up 7 different suppliers for LNG. The initial plan will be to bunker by trucking the fuel to the pier and may eventually evolve into bunkering from an LNG fuel barge. Another obstacle is regula- tory— the USCG currently does not differentiate be- tween LNG being transported as a cargo or used as a fuel. The current USCG process for reviewing LNG fueled ship designs is to use IMO MSC-285(86) as the interim guideline for these reviews until the actual USCG code is released, which is expected in 2014. Additional information is available at http:// www.uscg.mil/hq/cg5/ cg521/. Page 4PDF Image | USACE MARINE DESIGN CENTER Newsletter
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