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SKF – Manning
Ave., Merced St. & North
St. Lift Stations
Hydrogen sulfide corrosion in these lift stations prompted the
Selma Kingsburg Fowler Country Sanitation District (SKF) to seek
other alternatives to the original screw pumps. WBA and the District
evaluated submersible and self-priming pump alternatives and
decided upon submersible pumps. Based on this, WBA designed improvements
at several pump stations to incorporate the improvements. At
Manning Avenue the existing wet well was coated for corrosion
resistance, and two variable speed, 1200 gpm pumps were installed.
At the North Street station a new wet well was constructed using
concrete pipe sections lined with PVC to protect against hydrogen
sulfide related corrosion and two variable speed 900 gpm pumps
were installed. The design for 1800 gpm variable speed Merced
Street pump station included full coating of the existing interior
wet well for concrete corrosion protection and a walk-in control
room built half underground. The North Street Station was located
in downtown Selma, so the station design included sidewalks,
planter boxes, benches and landscaping. All stations were provided
with telemetry to the plant control room.
FSSD – 2002
Maintenance Project
WBA analyzed and designed the replacement of the variable speed
RAS pumping system and two raw sewage pumps with variable
speed drives as a part of this project for the Fairfield-Suisun
Sewer
District (FSSD). The RAS pumping system consisted was over
25 years old, and consisted of eight 40 hp pumps with eddy current
drives. We analyzed
the pumping capacity using field operating data to determine
whether the pumps should be repaired or replaced. We analyzed
the alternatives
for replacing the existing variable drive system based
on cost, harmonic distortion impacts, motor requirements, and
electrical
equipment location options. Based on this analysis, we
completed a design to replace the pumps, and install 6 pulse
VFDs. The design
included detailed construction sequencing constraints to
minimize interference with plant operations and modifications
improvements
to the SCADA system to incorporate the new equipment.
For the remote Cordelia Pump Station, we sized two new pumps based
on District flow projections. We evaluated VFD alternatives and
repair versus replacement of the 100 hp motors for use with the
new VFDs. Based on these analyses, the design included new 2500
gpm pumps with 18 pulse VFDs and 125 horsepower motors.
The above projects are representative of our experience in this area.
If you
would like additional information on these, or other projects that
we
have completed, please contact us.
For detailed descriptions
of representative projects in our other areas of expertise,
click below on the category you are interested in:
Recycled Water:
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