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 2.2 Yearly Inspection of Instruments. M a k e a thorough inspection of all
i n s t r u m e n t s and gauges for corrosion, d e p o s i t s , binding, and mechanical
d e f e c t s . C h e c k the following items:
q Ruptured
or
distorted
pressure
parts
q Incorrect calibration or adjustment
q Leaks in piping or meter
q Plugged
internal
passages
q Loose pointers
q Broken
balance-arm
screws
q Broken
or
loosened
q Broken or damaged adjustment assemblies
q Dirt or foreign material
q Binding of moving parts
q Dirty
gauge
movements
q Linkage
pins
binding
q Defective
gauge
glass
gaskets
q Gauge
valve
packing
leaks
q Badly worn pins or bushings
q Mercury
separation
in
thermometers
q Temperature
bulbs
damaged
by
overheating
q Plugged
piping
or
tubing;
loose
connections
q Mercury
q Defective
floats
q Operation of clockwork mechanism and integrator
q Secondary
element
electronics
q Sensors
q Coating
of
electrodes
q Capacity
of
instrument
still
sufficient
for
system
6-22
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