Many companies in South Africa have implemented the risk-based inspection (RBI) methodology as a maintenance strategy. The risk involved in operating a piece of equipment, past history, non-destructive examination techniques, failure modes,
and many other aspects determine the frequency of inspections required to meet legislation. The main purpose of the RBI methodology is to prevent failures of process equipment. The methodology for risk-based inspection for metal equipment
is well-established and has been proven in industry, becoming the norm nationally
and internationally. However, it is not possible to apply all the techniques to nonmetallic
equipment owing to vast differences between the two types of materials.
This paper discusses the results of data gathered on the RBI methodology for nonmetallic
equipment, and proposes a risk-based model that can be used to perform a risk assessment for non-metallic equipment in a process plant. The risk assessment can be used to formulate the next inspection interval for the asset.
Verskeie maatskappye in Suid-Afrika het reeds die metodologie van risikogebaseeerde inspeksie (RBI) geïmplementeer as deel van ‘n omvattende instandhoudingstrategie. Die risiko betrokke by ‘n fisiese item, bedryfsgeskiedenis, nie-vernietigende toetstegnieke, falingsmodusse, en vele ander aspekte bepaal die frekwensie van inspeksies wat benodig word om aan wetlike vereistes te voldoen.
Die hoofdoel van die risiko-gebaseerde metodologie is om faling van
prosestoerusting te verhinder. Die metodologie vir risiko-gebaseerde inspeksie van metaaltoerusting is goed bekend en word suksesvol toegepas in die industrie. Dis is
egter nie moontlik om al die tegnieke toe te pas op nie-metaaltoerusting nie weens die groot verskeidenheid van materiaaltipes. Hierdie artikel bespreek die data wat
ingewin is op die risiko-gebaseerde metodologie vir nie-metaaltipeprosestoerusting, en stel ‘n nuwe risiko-gebaseerde model voor wat gebruik kan word om die risiko te bepaal vir nie-metaal toerusting van ‘n prosesaanleg. Die risikoprofiel kan gebruik word om die volgende inspeksie-interval vir die toerusting te formuleer.
