UFC 3-570-06
JANUARY 31 2003
Table 4-5. Water Tank Calibration CP System Component Tests
CP SYSTEM TYPE
TEST MEASUREMENT
GALVANIC SYSTEMS
Measure anode-to-structure current using (in order of preference) a clamp-on
milliammeter, a multimeter measuring millivolts across a calibrated shunt, or a
multimeter connected in series measuring milliamperes.
IMPRESSED CURRENT
a)
Perform the rectifier operational checkout (paragraph 4-5).
SYSTEMS
b)
Calculate the rectifier efficiency by dividing the calculated
output DC power by the factored input AC power.
Table 4-6. Water Tank Calibration Potential Measurements
STRUCTURE TYPE
POTENTIAL MEASUREMENT LOCATIONS
TANK WALLS
Position the reference cell near the water surface, at mid-depth and at
the bottom in the following locations:
a)
Next to the tank wall directly adjacent to each anode string.
b)
Next to the tank wall midway between two adjacent anode
strings.
TANK BOTTOM
Locate the reference cell:
a)
Two inches above the tank bottom directly beneath each
anode string.
b)
Two inches above the tank bottom and as far away from the
anode strings as possible.
METALLIC RISER
Locate the reference electrode adjacent to the riser wall at intervals of
(Elevated Water Tanks)
1.5 meters (5 feet) from the top to the bottom of the riser.
PERMANENT
Measure and compare the potential of each permanent cell to a portable
REFERENCE CELLS
reference cell to determine its accuracy.
ALL TANKS
Annotate the water level for comparison to past and future
measurements.
4-4.2.2
For all tanks, compare potential measurements to measurements previously
4-9
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