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Uninterrupted Lift Station Operation Using By-Pass Pump
City of Oviedo
Utility – Wastewater Collection Division
April 2015
Uninterrupted Lift Station Operation
Emergency and/or
Uninterrupted lift
station pumping is
required by FDEP
(Chapter 62-604.400(2)(a)
62-604.400 Design/Performance Considerations
(2) (a) Emergency pumping capability shall be provided for all pump stations. Pumping capability shall be provided as follows:
1. Pump stations that receive flow from one or more pump stations through a force main or pump stations discharging through pipes 12 inches or larger shall provide for uninterrupted pumping capabilities, including an in-place emergency generator. 2. For pump stations not addressed in (2)(a)1. above, emergency pumping capability
may be accomplished by connection of the station to at least two independent utility substations, by providing a connection for portable or in-place engine-driven generating equipment, or by providing portable pumping equipment. 3. Such emergency standby systems shall have sufficient capacity to start up and
maintain the total rated running capacity of the station. Regardless of the type of emergency standby system provided, a riser from the force main with rapid connection capabilities and appropriate valving shall be provided for all pump stations to hook up portable pumps. All pump
station reliability design features shall be compatible with the available temporary service power generating and pumping equipment of the authority responsible for operation and maintenance of the collection/transmission system.
(
Typical Alternative Pumping Options:
Emergency Equipment
•Trailer pump or
•Trailer generator
Stationary Equipment
•Hard wired generator
•Hard plumbed by-pass pump
Advantages of Trailered Emergency equipment
Trailered emergency equipment is
• Cheaper (Less Capital expense)
• Works for multiple stations
• Labor intensive
Disadvantage of Trailered Emergency Equipment
Trailered Equipment requires
• Immediate 24hr/7day per week staff response
• Labor intensive set up for hoses or power cords
Uninterrupted Equipment
Stationary Generator
Stationary By-pass Pump
(FDEP requires repump or lift station with discharge of 12 inch or larger to have uninterrupted equipment)
Advantages of Stationary Generator
Stationary Generators • Use existing lift station pumps and controls
• Deigned to monitor grid and provide emergency
power to lift station when primary power falters
Disadvantage of Stationary Generators
Stationary Generators
• Most expensive option - Requires expensive
electrical isolation and switch gear equipment
• Dependent on lift station electrical equipment to
control pump start and stop.
• May require electrician to troubleshoot lift station
electrical issues.
• Requires generator to run the entire time power has
faltered
• Requires annual load bank testing
Stationary By-Pass Pump Oviedo has found an independent stationary By-Pass
Pump to be an economical and reliable option.
Simple System with Independent
Pump, Float Control & Motor Operation
Economic Advantage
City has found a typical By-Pass Pump System installation will cost about 30% less then a typical stationary generator system.
Capital Saving Example
No electrical switch gear required
Works Independently
The By-Pass Pump system is an independent system.
By-Pass pump system is not directly connected to lift station electrical and therefore isolated from typical lift station electrical Issues.
Lighting strikes,
Brown outs,
Power surges and
Electrical component failure.
62-604.400 Design/Performance
Considerations
• (2) (b) Pumping stations shall be protected
from lightning and transient voltage surges.
As a minimum, stations shall be equipped
with lightning arrestors, surge capacitors or
other similar protection devices, and phase protection
Ease of Operation By-Pass pump is simple to
operate:
• Small diesel motor
• Simple pump
• Independent start/stop: o Floats or
o Level indicator
By-Pass Pump Efficiency
By-Pass Pumps are efficient to Operate
• More fuel efficient, do not run under standby conditions. (On/Off with floats)
• Motor only operates pump
• Lift station staff can test in field by shutting down lift station
• No Load bank testing required
Typical
By-Pass Pump Installation Retrofit installation New Installation
By-Pass Pump Slab & Core
By-Pass Pump Plumbing
Other By-Pass Pump Advantages
• Pumps flows can be variable within ranges o Allows standard units to be shifted between different lift station sites
o Can be used for lift station rehab efforts
• Reduces point of failure part storage
Questions
City of Oviedo, FL
400 Alexandria Blvd. Oviedo FL 32765
Jim Woodger, Collection Supervisor 407-971-5690
Josef Grusauskas, Util. Manager 407-971-5679