EP 1110-1-27
27 Jan 00
Table 5-3. Long-Term PM Schedule
Maintenance Test
Testing Regime
Time Interval
Physical inspection
Borehole color video
At each major rehabilitation (before and
after) or five years (whichever is sooner).
Concentrate on screen and other stress
points
Surface facility inspection. Inspect and
Quarterly or each visit
clean as needed at sampling points
Examination of pulled components
As needed (at least test pump if not
pulling it annually). Wells should be
equipped for easy pulling if at all possible.
Hydraulic performance
Well discharge or acceptance (flow rate
Weekly (recommend installation of
and pressure)
automated data collection in accordance
with CEGS 13405*)
Drawdown
Weekly to biweekly. (recommend
installation of automated data collection)
Graphical analysis
Quarterly
Specific capacity test (well hydraulic
Annually or at recommended shorter
performance)
intervals for specific representative or
trouble wells.
At least annually or at recommended
Pump performance. Conduct step
shorter intervals if pump service is severe
"pump" test (Section 2-2) of centrifugal
(Q/s and pump test can be a single
pumps and similar wear analysis of
operation). Severe: This is subjective. One
positive displacement pumps, compare to
useful criterion: Pump replacement in 3 yr
"nominal" data
or less.
System and motor V, A, φ, Ω
Electrical (power)
Weekly (Recommend installation of
current monitors with alarms)
Physicochemistry
Inorganic parameters
At least quarterly using project onsite
instruments (calibrated) or routine
monitoring (laboratory)*
Suspended particulate matter (sand, silt,
Manually at well testing then quarterly
clay)
Turbidity (adds colloidal)
In-line monitors (continuous)*
Quarterly. Watch others (IRB, SRB,
Biofouling Microbial
BART analyses. Pick one indicator type
SLYM) at least annually. May be
Component
based on past performance (IRB, SRB,
discontinued if results vary little over
SLYM, DN) and use for a marker.
time.
Biofilm flow cell for microscopy
Annually on selected wells
Treatments and Service
Well hydraulic improvement and
As testing indicates Q/s drops below 90%
pumping systems
or pumping system degrades
In accordance with CEGS 13405.
* CEGS 13405 specifies continuous metering, monitoring, and recording of parameters such as flow, temperature,
pressure, and physical-chemical properties of discharged fluids.
(4) Chemical feeds (pellet or solution) are sometimes prescribed for well maintenance cleaning.
Operators should resist any temptation to rely on chemical feed systems themselves to maintain wells.
The feed suggested in item (1) would inject a cleaning solution along with flushing. Chemical choices
recommended may be found in Section 6-1.
5-5
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