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NITROGEN GENERATORSNitrogen generators use either membrane or pressure-swing-adsorption (PSA) technologies. Membrane generators made by Balston, a division of Parker, produce up to 99.5% pure, commercially sterile nitrogen at dewpoints to -58[degrees]F from compressed air. They use proprietary membrane-separation technology to divide air into two streams: one 95 to 99.5% pure nitrogen, the other oxygen-rich with carbon dioxide and other trace gases.Compressed air flows through bundles of individual, hollow fibers made of semipermeable membranes. Each fiber has a perfectly circular cross section and a uniform bore through its center. Because the fibers are so small, a great many can be packed into a limited space, providing enough surface area to produce a relatively high-volume flow of nitrogen.

HYDROGEN GENERATORSGenerators can also make hydrogen using one of two basic technologies: proton-exchange membranes (PEM), and palladium membranes. Hydrogen gas generators are most often used in gas chromatographs and in labs for hydrogenation reactions and engine-emission analysis. PEM systems from Parker produce flows from 90 to 1200 cc/mm of 99.99999% pure hydrogen at pressures from 0 to 100 psig. The Balston H2-500 hydrogen generator uses deionized water and electricity. It produces hydrogen gas through electrolytic dissociation of water via the PEM. The resultant hydrogen stream then passes through a palladium membrane using for purification. Because of the membrane''s small pore size, only hydrogen and its isotopes penetrate it. A membrane thus keeps the hydrogen gas at a purity level of two orders of magnitude greater than desiccant or silica gel-based systems. new compressor technology introduced during the 2003 International Air-Conditioning, Heating, Refrigerating Exposition (AHR Expo), held last January in Chicago, may have a significant effect on the future of mid-range chillers and rooftop applications in water-cooled, evaporatively cooled, and air-cooled chilled-water and direct-expansion (DX) systems. Designed and optimized to take full advantage of magnetic-bearing technology, the compressor was awarded the first AHR Expo Innovation Award in the energy category, as well as Canada''s Energy Efficiency Award for its potential to reduce utility-generated greenhouse-gas emissions. The compressor is key to a new water-cooled centrifugal-chiller design, with Air-Conditioning and Refrigeration Institute (ARI) tests indicating integrated part-load values (IPLVs) not normally seen with conventional chillers in this tonnage range.

The consumer versions of the Griphoists are the Pull All, which is rated to move 700 lbs. and the Super Pull All, rated at 1500 lbs. Of course you can get heavy-duty versions that move up to eight tons. The Pull Ails can handle pulling out stumps, hoisting car engines, and other homestead chores.--KKThe principle may be described as `hand-to-hand'' like a man pulling a rope. While one hand pulls, the other changes position to pull in power turn.The two hands represent the two jaws of the TIRFOR. They grip the wire rope without damaging it. They pull it during forward operation and restrain it during reverse operation.