TAILIEUCHUNG - Lubrication and Reliability Handbook 2010 Part 9

Tham khảo tài liệu 'lubrication and reliability handbook 2010 part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | B7 Lubricant biological deterioration Comparison of microbial infections in oil emulsions and straight oils Oil emulsions Straight oils Organisfns live in the continous water phase Organisms live in a separate discrete water phase or a dispersed water phase Alkaline environment usually changing slowly to neutral or even slightly acidic Water often becoming rapidly acidic Micro-organisms predominantly bacteria except in synthetic formulations Bacteria fungi and yeasts commonly occur Oil-in-water emulsion becomes unstable due to degradation of emulsifiers. Effect is less pronounced in bio-stable formulations Water-in-oil emulsions become stabilised due to surface activity of micro-organisms Anti-microbials biocides often included in formulation and give some initial protection Anti-microbials rarely included but can be added in use Temperature just above ambient favours growth Temperature often so high that systems are self-sterilising. Heated purifiers also pasteurise the oil Anti-microbial treatment usually involves water-soluble biocides Biocides must have some oil solubility ECONOMICS OF INFECTION The total cost of a problem is rarely concerned with the cost of the petroleum product infected but is made up from some of the following components 1 Direct cost of replacing spoiled oil or emulsion. 2 Loss of production time during change and consequential down-time in associated operations. 3 Direct labour and power costs of change. 4 Disposal costs of spoiled oil or emulsion. 5 Deterioration of product performance particularly a surface finish and corrosion of product in machining b staining and rust spotting in steel rolling c pick-up in aluminium rolling. 6 Cost of excessive slime accumulation . overloading centrifuges blinding grinding wheels blocking filters. 7 Wear and corrosion of production machinery blocked pipe-lines valve and pump failure. 8 Staff problems due to smell and possibly health. ANTI-MICROBIAL MEASURES These may involve 1 Cleaning and .

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