The city of Southside, Alabama, has experienced tremendous growth over the last decade. Located on the banks of the Coosa River, Southside is a relatively small, but progressive city and is always looking for ways to improve the quality of life for its residents. Just as so many other municipalities face aging infrastructure challenges, Southside determined a need to upgrade and replace one of its main lift stations that had become troublesome and costly for many years.
SCOPE OF CHALLENGE
The traditional suction lift station located on Highway 77 is one of Southside’s main lift stations and has been in service since 1991. The station had experienced several problems over the last few years including multiple failures due to the age and strain on the system. As a result of these failures, the high costs for repairs and the encroaching seasonal inclement weather, the situation was quickly considered an emergency installation. A quick turnaround was very critical in order to meet the needs of the flows coming into the system and the system not being out of service for a very long time.
THE SOLUTION
CDG Engineers & Associates worked with The Eshelman Company to select and install an EBARA EP1 duplex packaged pump system to replace the existing self-priming system that failed. Two, 30 horsepower submersible model DLKFU pumps each rated to deliver 150 gallons (567.81 liters) per minute at 145 feet (44.2 meters) TDH were specified as part of the system to accommodate the current conditions and allow for the anticipated expansion the system faces. The K Series design was specified to reduce clogging from fibrous waste (non-dispersibles) and thereby reduce maintenance and increase efficiency of operation.
The old station was removed and the 20 feet (6.1 meters) deep wet well cleaned and epoxy coated prior to installation. The EBARA packaged system is pre-assembled at the factory and shipped directly to the site ready to be installed.
EBARA’s standard package design includes a corrosion resistant, steel reinforced, polymer concrete base. Wet-well access covers are pre-cast into the base frame providing durability and sturdiness. All discharge piping, valves and controls are protected inside an R7 insulated, weatherproof fiberglass enclosure. Large doors on both sides of the enclosure provide easy access to system components.
Safety grates protect personnel from falling into the wet well when the access doors are open. Penetrations for the piping and cables are sealed from the wet well to prevent harmful gases from entering the enclosure. Dedicated pressure gauges and sensing piping for each pump are standard on the EBARA system. Pressure sensor rings isolate the gauges from the pumped wastewater to eliminate clogging of pressure gauge lines and ensure accurate, repeatable pressure readings.
“Everything is at ‘head and hand’ level,” explained Jeff Harrison, PE, CDG Engineers & Associates. “This eases maintenance and removes the need to send personnel into dangerous confined spaces present in traditional below ground valve vaults.”
The station runs on 460/3/60, and is designed with a float switch level control system with reduced voltage soft starters to limit inrush current to the station.
This station was loaded with optional features, including individual board mounted discharge gauges, an emergency bypass connection and a (Thern) portable hoist; these options making regular maintenance more manageable and efficient.
THE RESULT
The installation concluded with a “clean-water” (accommodated by the City of Southside’s Fire and Rescue Department) start-up and testing with minimal onsite adjustments made to the controls and floats to ensure optimal performance.
Once the EBARA EP1 packaged station arrived on site, it was installed and on line at the end of the second day. It was a very quick retrofit, which kept downtime and bypass pumping to a minimum and was delivered and installed well within the city of Southside’s capital budget.
What would have taken two months to install a new system, the city of Southside was able to complete in two days due to the refurbishment of the existing wet well and the selection of the single-source and complete EBARA packaged pump system.
“The package station concept incorporates all the necessary equipment in one factory built unit with a company that has decades of experience providing reliable sewage pumps,” said Ed Moore, vice president, The Eshelman Company. “We feel confident the EBARA packaged system is going to be a cost effective solution for any city looking to put in a replacement—or new—lift station.”
About The Author
Regina T. Marsden Crupe is the marketing communications manager for EBARA Fluid Handling, the U.S. sales and service subsidiary of EBARA Corporation, Japan, and provides engineered pump, pump products and related services for the water, wastewater, commercial, municipal, energy and power industries offering reliable product knowledge, application expertise and responsive support including aftermarket replacement parts services. For more information, visit www.pumpsebara.com.
MODERN PUMPING TODAY, March 2015
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