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I Processinstallations Questar – P (Process Plant)
I Constructions Questar – S (Structures)
IM Pressure Safety Valves Questar – PSV (Pressure Safety Valves)
M Risk Based Maintenance Questar – M
I Pipelines (subsea) Questar – PL
I Drill hole (onshore / offshore) Questar – DH (DownHole)
As a oneliner:
A combination of (a) prediction (specialist knowledge) with (b) situational data (customer info; consequences of faiure) and (c ) evidence of performance (“trust”/”experience”) in order to determine cost effective maintenance tasks and intervals.