Modern production machines require a new approach towards the maintenance “problem”. Maintenance engineers realise this and are eager to implement new philosophies/ techniques/methodologies that come available. The problem is that most of these are part solutions and cannot produce the required results when not used in its larger (maintenance) managerial context. These philosophies/techniques/methodologies should be used as a part of a larger maintenance “plan”, which is strategically driven. Success follows by using a top down process of setting maintenance policy, enriching it with well thought through procedures and supporting it with a proper maintenance business plan.
Increased competitiveness in the production world necessitates improved maintenance strategies to increase availabilities and drive down cost. The maintenance engineer is thus faced with the need to make more intelligent pre ventive renewal decisions. Two of the main techniques to achieve this is through Condition Monitoring (such as vibration monitoring and oil anal ysis) and Statistical Failure Analysis (typically using probabilistic t echniques). The present paper discusses these techniques, their uses and weaknesses and then presents th e Proportional Hazard Model as an solution to most of these weaknesses. It then goes on to compare the results of the different techniques in monetary terms, using a South African case study. This comparison shows clearly that the Proportional Hazards Mod el is sup erior to the present t echniques and should be the preferred model for man y actual maintenance situations. OPSOMMING Verhoogde vlakke van mededinging in die produksie omgewing noodsaak verbeterde instandhouding strategies om beskikbaarheid van toerusting te verhoog en koste te min imeer. Instandhoudingsingenieurs moet gevolglik meer intellegente voorkomende hernuwings besluite neem. Twee prominente tegnieke om hierdie doelwit te bereik is Toestandsmonitering (soos vibrasie monitering of olie analise) en Statistiese Falingsanalise (gewoonlik m.b.v. pr obabilistiese metodes). In hierdie artikel beskou ons beide hierdie tegnieke, hulle gebruike en tekortkominge en stel dan die Proporsionele Gevaarkoers Model voor as 'n oplossing vir meeste van die tekortkominge. Die artikel vergelyk ook die verskillende tegnieke in geldelike terme deur gebruik te maak van 'n Suid-Afrikaanse gevalle studie. Hierdie vergelyking wys duid elik-uit dat die Proporsionele Gevaarkoers Model groter beloft e inhou as die huidige tegni eke en da t dit die voorkeur oplossing beho ort te wees in baie werklike instandhoudings situasies. 99 http://sajie.journals.ac.za
Maintenance organisations have to obtain the correct strategic 'mix' to ensure success. This includes having a strategically sound maintenance policy and managerial procedures, a well thought through maintenance plan, a proper maintenance management and operational system, proper operational procedures, employment of the necessary technology and sensible management of human resources. Reliability Centred Maintenance (RCM) has enabled maintenance users to develop, scientifically founded maintenance plans. However, due to shortcomings in the methodology and shortcuts taken by RCM practitioners, these benefits have not been forthcoming in industrial use. This paper addresses these limitations and develops an improved RCM methodology. It was tested against the 'classical' RCM in a typical industrial setting, with significant benefits being demonstrated. OPSOMMINGInstandhoudingsorganisasies moet die regte strategiese 'mengsel' verkry om sukses te verseker. Dit sluit 'n strategies gesonde instandhoudingsbeleid en bestuursprosedures, sowel as a weldeurdagte instandhoudingsplan, 'n goeie instandhoudingbestuur en -operasionele stelsel, goeie operasionele prosedures, die regte vlak van instandhoudingstegnologie asook goeie mensbestuur in. Betroubaarheidsgebaseerde Instandhouding (BGI) stel gebruikers in staat om wetenskaplik gefundeerde instandhoudingsplanne daar te stel. Desnieteenstaande word hierdie voordele meesal nie in industriële toepassing verkry nie vanweë tekortkominge in die BGI metodologie asook die neem van kortpaaie deur BGI praktisyns. Hierdie artikel ondersoek hierdie beperkings en ontwikkel 'n verbeterde BGI metodologie. Dit is teenoor 'klassieke' BGI in 'n tipiese industriële omgewing getoets en het beduidende voordele getoon.
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