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A. On-Service Inspection (OSI): This inspection is performed while the tank is still in service.
Inspection Scope mainly involves detailed visual examination on exterior of the tank done by an authorized API-653 inspector and ultrasonic thickness measurement of the shell & roof plate including all nozzles.
B. Out of Service Inspection (OOSI): This inspection is performed while the tank is not service.
Our authorized API-653 inspector conducts a visual inspection on exterior & interior of the tank and assures the quality and completeness of the nondestructive examination (NDE) results.
Nondestructive examination mainly involves MFLT on tank bottom & annular plates, ultrasonic thickness measurement of the shell & roof plate including all nozzles.
C. Reports:
Inspections shall be documented in a comprehensive report containing:
- All observations
- NDE results (UT, MFTL, etc.)
- Complete evaluation of the condition of the tank
- Tank repair recommendations, remaining life, tank external shell settlement cosine graph, and inspection interval.
