TREATMENT PLANT LIFT STATIONS
The Lift Station Division provides the pumping of raw
sewage from the gravity sanitary sewer system to the City’s 4.0 million
gallons per day (mgd) Wastewater Treatment Plant. At present, lift
station personnel maintain 59 lift stations within the City’s service
area. These lift stations range in pumping capacity of 1,000 gallons per
day to 500,000 gallons per day. The City’s operations and maintenance
program of these lift stations ensures constant performances through
daily checks and data collection. This information provides vital data
in the operations of each lift station.
Through this data, staff can determine a problem in normal operations then take corrective action before any serious problems can occur. Staff is on call 24 hours a day, 7 days a week, 365 days a year to ensure that these vital links within the sanitary sewer collection system continue to function, which helps to ensure the safety and welfare of the public and the environment.
The following are some of the standard daily, weekly and monthly activities that lift station staff perform to insure these lift stations provide uninterrupted service:
Daily hours of pump operations
Control panel operations
Alarm system functions
Cleaning of control floats
Emergency generator operations
Electrical component operations
Grease removal from wet wells
Scheduled pump/motor rebuilding
Through the efforts of staff, the Lift Stations Division maintains electrical components, pumps/motors and control parts, as standard inventory. This inventory is used as required to maintain constant lift station operations, with out interruption of service. By providing staff with key lift station components and through the City’s proactive operations and maintenance program.
LIFT STATION DESIGN CRITERIA:
(for contractors/developers and general knowledge)
All lift stations MUST comply with 62-604 FAC
The minimum diameter of the lift station wet well is 6’
A 16 hour of operations calculation must be used
A peak factor of 4 must be used
A 100 gallon per capita per day must be used
The alarm float must be set at least 6” below the invert elevation of the lowest influent pipe
Control floats must have a spacing of at least 12”, with exception to the lead (on) float and the off which must have at least 24” of spacing
The off float must be at least 24” off the bottom of the wet well
The hopper must have a 1 to 1 ratio
The maximum pump starts per hour equals 5
Pumps must be able to pass a 3” sphere
A minimum of 2 submersible pumps are required
Each pump must be capable of handling all flow during peak time independent of the other
The maximum velocity feet per second (fps) within a force main shall not exceed 10 fps with both pumps on
The minimum fps within a force main shall be no less than 2 fps with 1 pump on.
Control panels must have an emergency generation hook-up
Alarm system must have battery back-up
Specific control panel components and pumps are required. The City can provide details based on application.