A. On−Service Inspection (OSI): This inspection is performed while the tank is still in service.i. Inspection Scope mainly involves detailed visual examination on exterior of the tankdone by an authorized API−653 inspector and ultrasonic thickness measurement ofthe shell & roof plate including all nozzles.
B. Out of Service Inspection (OOSI): This inspection is performed while the tank is not in service.
- Our authorized API−653 inspector conducts a visual inspection on exterior & interiorof 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:i. 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.