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Multilayer Composite Pressure Vessels

Lightweight tanks can be made in diverse sizes and shapes.

Posted in: Manufacturing & Prototyping, Briefs

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Growing Aligned Carbon Nanotubes for Interconnections in ICs

Carbon nanotubes are embedded in silica with their tips exposed as contacts.

Posted in: Manufacturing & Prototyping, Briefs

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Shipbuilders Design Pipeline Dredging Barge With FEA Software

Finite element analysis software aids in the design of an undersea natural gas liquids pipeline. A South American pipeline project that traverses the Amazon jungle and the Andes Mountains to the Pacific coast originates in the Camisea fields of eastern Peru, which are among the world’s largest natural gas (NG) reserves, holding approximately 11 trillion cubic feet of NG and 600 million barrels of associated natural gas liquids (NGL). To access these reserves, a $500-million (USD) project was led by Pluspetrol Peru Corporation S.A. (Pluspetrol) that included construction of two pipelines — one for NG (714 km) and the other for NGL (540 km). As construction of the pipelines neared completion, work focused on endpoints such as the fractionation plant where NGL would be processed into commercial products including propane, butane, and condensates.

Posted in: Manufacturing & Prototyping, Briefs

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Making a Metal-Lined Composite-Overwrapped Pressure Vessel

The metal liner reduces loss of gas by diffusion without adding much weight.

Posted in: Manufacturing & Prototyping, Briefs

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High-Temperature, High-Load-Capacity Radial Magnetic Bearing

Speed and temperature limits of rollingelement bearings can be exceeded.

Posted in: Manufacturing & Prototyping, Briefs

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Fabrication of Spherical Reflectors in Outer Space

Process takes advantage of vacuum.

Posted in: Manufacturing & Prototyping, Briefs, TSP

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Progress in Fabrication of Rocket Combustion Chambers by VPS

Several documents in a collection describe aspects of the development of advanced materials and fabrication processes intended to enable the manufacture of advanced rocket combustion chambers and nozzles at relatively low cost. One concept discussed in most of the documents is the fabrication of combustion-chamber liners by vacuum plasma spraying (VPS) of an alloy of 88Cu/8Cr/4Nb (numbers indicate atomic percentages)—a concept that was reported in "Improved Alloy for Fabrication of Combustion Chambers by VPS" (MFS-26546), NASA Tech Briefs, Vol. 23, No.1 (January 1999), page 50. Another concept is the deposition of graded-composition wall and liner structures by VPS in order to make liners integral parts of wall structures and to make oxidation-and thermal- protection layers integral parts of liners: The VPS process is started at 100 percent of a first alloy, then the proportion of a second alloy is increased gradually from zero as deposition continues, ending at 100 percent of the second alloy. Yet another concept discussed in one of the documents is the VPS of oxidation-protection coats in the forms of nickel-and-chromium-containing refractory alloys on VPS-deposited 88Cu/8Cr/4Nb liners.

Posted in: Manufacturing & Prototyping, Briefs

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