Risk-based Inspection Strategy RBI

Determination of the type and frequency of inspection on the risk is what risk-based inspection (RBI) is all about. Risk is quantitatively determined by the probability of failure and the consequences thereof. This implies that the type of failure (blistering, cracking, etc.) and its rate are known through experience, testing, or other information. The owner, on the basis of the contained liquid, its amount, and its hazardous nature, determines the consequences. In almost all cases, fluoropolymers are used for corrosive and hazardous chemicals, and the consequences of failure are quite severe. This has led to the general guidelines for type and frequency of inspections shown in Table 9.1. 

Vessels First inspection after the first year of operation, thereafter as needed Spark test only if essential. First inspection after the first year of operation, thereafter as needed External UT optional Spark test only if essential. First inspection after the first six months of operation, thereafter every six months or as needed External UT recommended Spark test only if essential Every six months External UT highly recommended Spark test only if essential 

Hoses Hydrotest every six months Replace every six months  

Expansion joints Visually inspect externally for exceeding misalignment specification Correct or replace as needed Internal inspection every year Replace or upgrade as needed  

Piping External inspection for flange flare and weep holes Internal inspection when available  

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