The duct work has an outside diameter of 90 inches and is 38 feet long. The duct assembly is fabricated entirely from ASTM A516-70 carbon steel. The assembly has two support bases and stiffening rings that provide strength and rigidity for the duct work. The assembly is a section of air supply duct in an Ammonia Plant.
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The base measures 63 inches square while the top load flange measures 55 inches square. One of the springs has an overall height of 22-7/16″ and the other an overall height of 28-5/8″. Both big ton springs are custom designed and fabricated from carbon steel with a hot-dipped galvanized finish. The top of the load flange is covered by a stainless steel slide plate. These big ton springs will be used to support heavy (in excess of 100,000 lb.) loads where a standard variable spring would be undersized.
One of the big ton springs is designed with a operating load of 126,000 lb. and the other with an operating load of 225,000 lb. Prior to fabrication, all of the coils, within the frame, were individually tested to insure correct spring rate and load capacity. After the units are fabricated, the entire assembly is tested throughout the entire load/travel range.
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Piping Technology & Products, Inc. designed and fabricated these saddle supports to support FRP pipe or similar plastics in sizes from 2″ to 36″ in diameter. The saddle support is fabricated from a molded density 20 polyurethane block with a load bearing capacity of 150 PSI that allows for high loads for a 36″ diameter line.
The base is bonded to a 20 gauge steel pan that provides a steel to steel resting surface. The foam is extended on each side of the base to allow field strapping of the support to the pipe. These saddle supports are often used in a circulating water service. These particular supports are to be used in a power generating station in the U.S.
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