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 MECHANICAL
Unfired Pressure Vessels-External Inspection-Continued
cracks
loose or dislodged material
excessive corrosion
cracked or broken welds
loose or missing bolts or rivets
warped or bent structural members
n Piping:
leakage
strain or torsion
excessive corrosion
improper drainage
misalignment
lack of support
inadequate provision for expansion or contraction
excessive vibration
pockets at valves and connections
loose
deteriorated
strained
inadequate connections
settlement
improper tension and alignment in supports
n Stop and Check Valves:
loose, missing or broken parts
excessive wear or corrosion
leakage
obstructed drain openings
n Pressure Reducing Valves:
loose, missing or broken parts
rust, scale or other substance preventing proper operation
6-39
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