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 MECHANICAL
Unfired Pressure Vessels-Internal Inspection-Continued
excessive corrosion
HYDROSTATIC OR PNEUMATIC TEST
n Preparation:
inadequate
incomplete
n Inspection:
significant drop in pressure in 15 minutes
leakage
loose parts
deformations
Maximum Allowable Working Pressure
Recalculated
INSPECTION OF OPERATION
n Controls:
inability to maintain proper pressures
improper adjustment for cut-out and cut-in devices
n Piping:
leakage
excessive vibration
tendency to crystallize
n Pressure Indicating Gages:
stuck pointer
restricted movement of pointer
obstructed connections
n Temperature Indicating Devices:
excessive temperatures indicated
particularly during and immediately after high load demands
n Stop and Check Valves:
6-42
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