Solution allows township to control pumping operations remotely
For many years, different types of flooding tormented residents of Lyndhurst, N.J., in several parts of town. Residents were increasingly becoming concerned about their personal safety as well as property values.
Failing, old long-shaft pumps at the Lyndhurst Sewer Department’s storm water station were out on maintenance issues more than in operation. Existing pumping equipment was noisy, prone to blockage by debris and suffering from lube system problems. Removing the equipment for service was not only a challenge, but also expensive.
Key elements of the improvement to the township’s storm water pumping station design began with improving hydraulic inlet conditions in the clear well. Lyndhurst was also determined to procure robust replacement pumps that were both compact and able to handle fibrous debris from a floating river. Finally, the town required a remote monitoring and control system for when the pumping station was inaccessible due to flooding.
Pump replacement included a strong preference for a submersible-pump solution by Lyndhurst officials. The Lyndhurst Department of Public Works (DPW) was already very familiar with Flygt’s reliability and the services provided by Pumping Services Inc., the pump manufacturer’s local representative. After careful review of the pump’s axial-flow design, officials decided to go with mixed-flow units. The mixed-flow pump units offer a compact footprint that could be efficiently incorporated into the existing station clear well. In addition, the axial-flow pump can operate in a less-than-ideal wet well layout and are able to handle difficult floodwater debris, such as branches, leaves, weeds, trash and sediment such as sand, silt, mud and soil.
Previous pumps were replaced with two 135-hp Flygt Model LL3602 submersible storm water pumps. The storm water station now has a reliable capacity of 36,000 gpm.
“The new submersible mixed-flow pumps have the same 135-hp motor rating as the old pumps, but these pumps indeed are working,” said Patrick Carberry, P.E., the project manager for the consultant on the project, Neglia Eng. “Even when the pump capacity rating [on paper] remains unchanged, the difference is visible. With the new pumps, area ponding is rapidly removed after heavy rain events.”
The new submersible pumps do not require a separate lubrication or cooling system, and they operate with a low operating sound level, minimal station superstructure and simple pipe work.
In the past, the storm water pumping station could only be controlled at the pumping station. During major flooding events, access to the pumping station is not possible. The retrofitted pumping station design now includes software that enables remote monitoring and control of essential equipment such as the pumps and generator. Monitoring and control is available at off-site locations, including the Lyndhurst DPW headquarters, through a web-based SCADA system. Furthermore, the SCADA system allows monitoring of pump and generator operations, fuel levels and even the water level of the Passaic River at the pumping station.
The new storm water pumps saved the day. Flood ponding has been rapidly removed. Since the new pumps were installed in 2014, residents have been able to rely on a storm water pumping system that finally works.
“At the end of the day, the Lyndhurst residents secured relief from chronic troublesome flooding,” said Township of Lyndhurst Engineer Michael J. Neglia, P.E. “Lyndhurst gained a reliable, state-of-the-art storm water pumping station featuring enhanced hydraulic performance with new pumps, controllers, standby power system, SCADA and communications systems. At the same time, Lyndhurst has reduced the operation and maintenance expenses of the storm water pumping station.”