Sewer Lines Lift Stations Pumps Motors Replacement
The Town of Amherst has secured Federal funding to replace the old inefficient pump motors in its 44 Sanitary Lift Stations (Lift Stations) with high efficiency motors.
The primary function of the Lift Stations is to lift sewage a certain vertical distance and then discharge into a pipe at a level for gravity to transport the sewage. Each Lift Station has at least two pumps that cycles based on a level control in the wet well of the Lift Station. One of the pumps serves as a backup.
The existing pump motors are standard efficient rated motors, been in service on average for over 15 years, and are specified to operate at 83% to 85% efficiency with sizes ranging from 5 HP to 25 HP. Significant energy savings is possible by replacing the motors with high efficiency motors with energy efficiency rating from 91% to 93% efficiency.
A 2001 engineering study commissioned by the town estimated the annual savings of high efficiency motor replacements at 4 representative Lift Stations range from 863 kWh to 1,901 kWh, with an average annual saving of 1,326 kWh per Lift Station. Extrapolating the average saving to 44 Lift Stations yields potential total annual savings of 58,344 kWh or equivalent to 31,758 kg of CO2 emissions reduced.
The primary function of the Lift Stations is to lift sewage a certain vertical distance and then discharge into a pipe at a level for gravity to transport the sewage. Each Lift Station has at least two pumps that cycles based on a level control in the wet well of the Lift Station. One of the pumps serves as a backup.
The existing pump motors are standard efficient rated motors, been in service on average for over 15 years, and are specified to operate at 83% to 85% efficiency with sizes ranging from 5 HP to 25 HP. Significant energy savings is possible by replacing the motors with high efficiency motors with energy efficiency rating from 91% to 93% efficiency.
A 2001 engineering study commissioned by the town estimated the annual savings of high efficiency motor replacements at 4 representative Lift Stations range from 863 kWh to 1,901 kWh, with an average annual saving of 1,326 kWh per Lift Station. Extrapolating the average saving to 44 Lift Stations yields potential total annual savings of 58,344 kWh or equivalent to 31,758 kg of CO2 emissions reduced.
