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 MECHANICAL
Unfired Pressure Vessels-External Inspection-Continued
n Pressure Control Switch:
loose, missing or broken parts or connections
corrosion
rust or other substance preventing proper operation
INTERNAL INSPECTION
n Preparation for Inspection:
inadequate
incomplete
untimely
n Pressure Gage:
improperly calibrated. Recalibrate
n Vessels Secured or Stored:
not completely dry
inadequate supply of desiccant
improper or inadequate placement of desiccant
n Corrosion Resistant Lining:
cracks
corrosion behind lining
corrosion behind deposits on lining
n Minimum Thickness (Surfaces exposed to Corrosion from Vessels'
Contents):
determine
n Maximum Corrosion Rate:
determine
n Shell Plates:
cracks
defective joints
distortion
erosion
6-40
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