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TACTICAL OPTIONS

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Information about TACTICAL OPTIONS
Science-Technology

Published on June 19, 2009

Author: livycat

Source: authorstream.com

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TACTICAL OPTIONS : TACTICAL OPTIONS RUN-TO-FAILURE MAINTENANCE IS PERFORMED ONLY AFTER THE EQUIPMENT FAILS. ELECTRONIC CIRCUITS REDUNDANCY IF A PRIMARY UNIT FAILS, THE SECONDARY (BACK-UP) UNIT TAKES OVER. SECURITY SYSTEMS, MONITORING SYSTEMS, POWER PLANTS, ETC. TACTICAL OPTIONS : SCHEDULED COMPONENT REPLACEMENT AT A PREDETERMINED POINT, BASED ON EITHER TIME OR USE, A PARTICULAR ASSEMBLY, COMPONENT, OR PART IS REPLACED, REGARDLESS OF CONDITION. ELECTRIC WHEEL MOTORS SCHEDULED OVERHAUL LIKE SCHEDULED REPLACEMENT, THE PLANT OR EQUIPMENT IS STRIPPED & OVERHAULED, BASED ON A PREDETERMINED PLAN. PETROCHEMICAL PLANTS, ANNUAL SHUTDOWNS TACTICAL OPTIONS TACTICAL OPTIONS : TACTICAL OPTIONS AD HOC MAINTENANCE MAINTENANCE DONE ON THE FLY OR WHEN THERE IS A PRODUCTION WINDOW. PREVENTIVE MAINTENANCE BASED ON EITHER TIME OR USE FACTORS CARRIED OUT BY CONDUCTING INSPECTIONS, CLEANING, LUBRICATION, MINOR ADJUSTMENTS PROCESS, MANUFACTURING SECTORS DUE TO WEAR, TEAR, & CORROSION, CHEMICALS & OTHERWISE. IT PROMOTES EQUIPMENT AWARENESS & DESCIPLINED INSPECTION. TACTICAL OPTIONS : TACTICAL OPTIONS CONDITION-BASED MAINTENANCE MAINTENANCE BASED ON ITS MEASURED CONDITIONS VIBRATIONS, TEMPERATURE, STRESS, CONTAMINATION MOST EFFECTIVE – CAN WARN BEFORE FAILURE OCCURS. REDESIGN DONE FOR CRITICAL EQUIPMENT WHERE IT IS DIFFICULT TO MEASURE THE CONDITION OR DETECT IMMINENT FAILURE. CONDITIONAL PROBABILITY OF FAILURE : CONDITIONAL PROBABILITY OF FAILURE WORST OLD : WORST OLD AGE-RELATED FAILURES RAPID INCREASE IN FAILURES AT A PARTICULAR POINT OF USE THE LEAST COMMON FAILURE MECHANISM OF ALL ROUTINE MAINTENANCE BASED ON TIME IS EFFECTIVE EXAMPLES IMPELLERS CRUSHER JAWS TRACKS LINERS BATHTUB : BATHTUB HIGH PROBABILITY OF FAILURE AT THE BEGINNING & END OF ITS LIFE TWO TACTICS ARE NECESSARY TO DEAL WITH THE EARLY & END-OF-LIFE PROBLEMS IT IS A COMBINATION OF WORST OLD AND WORST NEW EXAMPLE ELECTROMECHANICAL SYSTEMS SLOW AGING : SLOW AGING STEADILY INCREASING PROBABILITY OF FAILURE WITH AGE ASSOCIATED WITH CORROSION OR CREEP USUALLY WHEN EQUIPMENT IS IN CONTACT WITH THE PRODUCT USE REBUILD OR COMPONENT REPLACEMENT TACTICS EXAMPLE PIPES REFRACTORIES TIRES STRUCTURAL CLUTCHES BEST NEW : BEST NEW NOT AGE-RELATED, EXCEPT AT THE BEGINNING OF LIFE AGE-BASED ROUTINE MAINTENANCE GENERALLY INEFFECTIVE AS WITH RANDOM MECHANISMS, CONDITION-DIRECTED IS THE BEST TACTIC EXAMPLE HYDRAULICS PNEUMATICS CONSTANT : CONSTANT RANDOM FAILURES, NOT AGE-RELATED COMPLEX EQUIPMENT SYSTEMS: ELECTRONIC, ELECTRIC, MECHANICAL ROUTINE AGE-RELATED MAINTENANCE IS INEFFECTIVE EXAMPLE BALL BEARINGS WORST NEW : WORST NEW MOST COMMON FAILURE MECHANISM FOR COMPLEX EQUIPMENT PROBABILITY DECLINES WITH AGE, PERHAPS BECAUSE OF DESIGN, MANUFACTURE, CONSTRUCTION, OR MANAGEMENT ONCE THE INFANT MORTALITY PROBLEM IS SOLVED, ROUTINE MAINTENANCE PLAYS A MINOR ROLE EXAMPLE ELECTRONICS AVIONICS HIGHLY COMPLEX/INTEGRATED EQUIPMENTS

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