道康宁Molykote全系列产品供应商，瑞士巴索公司苏州地区授权经销商，巴索切削液全系列产品

Value PropositionTechnical know-how and a lubricantrecommendation from Dow Corningapplications engineers helped drivecosts down.ApplicationLubrication of vacuum pump inchemicals processing plant.ProblemAnti-oxidant additives in aconventional oil reacted to processgases, causing corrosion andpitting inside the pump casing, andcatastrophic failure every four to sixweeks.SolutionUltra high-purity mineral oilcontaining anti-oxidant additivesbased on new, low-additivetechnology chemistry.Product SelectedMolykote® Brand L-0610 vacuumpump oilResultsEliminated catastrophic failure thathad become routine, saving $40,000in maintenance costs.

Molykote® brand Mineral Oil Solves Vacuum PumpFailure, Saves $40,000 In Maintenance CostsLubrication technicians helped a chemicals manufacturer drive costs downby solving a vacuum pump failure, saving $40,000 in maintenance costs.Dow Corning had installed a new two-stage vacuum pump in one of theprocessing plants in its chemical manufacturing complex in Midland, MI, wherethe pump was needed to draw gases from a process reactor vessel. The pumpwas put into operation using a conventional mineral oil that was specified bythe original equipment manufacturer (OEM). During the first nine months ofoperation there was a catastrophic failure every four to six weeks.“There was so much corrosion that it caused the casing to pit, and we couldn’tjust make repairs,” says Lisa Honaman, building engineer. “We had to order anew pump casing and other major parts every time, then spend one to two daysrebuilding the pump.”

“We estimate the breakdowns cost us $8,000 to $9,000 each time. The repairparts cost $6,400 and labor averaged $2000, if the work could be scheduledduring regular hours, she explains.”High Temperature Additive ReactionThe pump drew hydrochloric acid vapors from a reactor vessel used tomanufacture pharmaceutical “actives.” During the vacuum process, some ofthe acidic vapor condensed into a liquid form and mixed with oil inside thechamber. As the oil stream hit the inside of the chamber casing, the zinc-basedanti-wear additives in the conventional oil mixed with the hydrochloric vaporsand catalyzed a reaction that drew metal from the casing and created ferricchloride. The result was a “pitting” action in which metal particles flaked off ofthe inside casing of the vacuum chamber, where the tips of the rotor vanes haveto provide an oil and vacuum seal. Cracks in the chamber housing revealedfurther deterioration.“The result was devastating,” says Honaman.

First of all, the pitting created imperfections that corrupted the full integrityof the surface of the inside casing and the tips of the rotor vanes. Theseimperfections prevented the formation of a reliable oil film that was needed tomaintain a vacuum seal while preventing surface contact to eliminate wear.Combined with the acidic oil, the resulting increase in higher operatingtemperature contributed to a breakdown of the phenolic/fiber composition ofthe rotor vanes. As the rotor turned, particles chipped off the trailing edge

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