![]() ![]() The liquid ring vacuum pump would increase the material and installation cost of the system by about $4000, but the savings in steam consumption would pay back the added cost in less than two years. The hybrid system was selected because the three-stage jet ejector would use only 1240 lb/hr of 100 psig steam. The other option was a hybrid vacuum source composed of a three-stage steam ejector system and a liquid ring vacuum pump that is more energy efficient than ejectors for low vacuum applications. A new five-stage jet ejector system to meet these requirements would use 1395 lb/hr of 100 psig steam. ![]() Two options were considered when the company decided to replace the original system with a system designed for 0.15 mm Hg more ยป with a non-condensible gas load of 10.8 lb/hr. A consistent polymerization vessel vacuum of 0.3 mm Hg is needed, but the existing vacuum source, a five-stage steam jet ejector, could only provide a 0.5 mm Hg level. The process for making polyester requires an extremely low vacuum on the polymerization reactor. Nylon-6 molding and extrusion resins are also produced at the plant in Hopewell, Virginia. Firestone Fibers and Textiles Company, a division of Firestone Tire and Rubber Company, manufactures tire and industrial yarns of polyester and nylon-6. ![]()
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