Altamont Sewer Pumping Station
LOCATION: Chattanooga, Tennessee
- Steve Bostic
- Glenn Hanson
COST: $1 Million
- Navigated Complex Hurdles Without Schedule Disruption
- Innovative Operational Concept
- SRF Funding
- Decreased Power Requirements & Increasing Station Capacity
LDA Engineering was selected by the City of Chattanooga to evaluate the Altamont pumping station to determine the upgrades necessary to address the flows entering the station from the collection system. The pump station evaluation included a detailed review of the electrical and mechanical components of the station and development of a plan to upgrade the station, which experiences a
wide range of influent flows due to I/I in the collection system and the variation of customer types in the collection system, i.e. single and multi-family residential, restaurants, small commercial, and a school.
The station is unique in that it included four pumps, two rated at 500 gpm and two rated at 50 gpm. There are also two force mains, a 6-inch and a 3-inch, that discharge to a common manhole. The efficiency of the smaller pump/ force main combination had started decreased due to the buildup of solids in the force main. The larger pumps typically cycled on/off extensively when the flows increased to the point where they were called upon. The result of the station evaluation included recommendations to replace the existing electrical components inside an existing stainless steel cabinet, new pumps/motors, addition of flow meters, and a new emergency generator.
In order to address the pump operational issues, LDA designed the smaller pumps at 75 gpm each to reduce the need for the larger pumps and increase the velocity in the 3-inch force main to prevent disposition of solids. VFD’s were installed on the larger pumps to minimize pump on/off cycling when they were called upon. An automatic drain valve was also installed on the 6-inch force main to drain the pipe after flows dropped to a preset level (small pumps operational) to prevent septic conditions in the pipe.
The project not only addressed issues with the station operational characteristics, it reduced power requirements by reducing run times and on/off cycling of the larger pumps. LDA also provided assistance with bidding, engineering services during construction, and resident project representativeBack to Projects