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Package Sewer Submersible Lift Station
This lift station was put in place to pump to the newly installed prepackaged wastewater treatment plant. It serves as the main lift station for the entire town of Buttonwillow, CA. Everything from town flows into this station to be treated by the wastewater treatment plant.
Jensen Engineered Systems supplied all the structural, mechanical, electrical, communications, and construction for this complete turn-key submersible lift station. The wet well is constructed out of a 96” diameter manhole material. The wet well is lined with A-Lok Duraplate lining system that was cast into our manhole during the pouring process. The entire lift station was installed by Jensen Engineered Systems. The heart of a lift station is always the pumps. In this particular project, two Homa Pumps were installed. These pumps are constructed of the highest grade material and have a long proven history. (more…)
Clark County Detention Center (CCDC) is located in Las Vegas, NV and serves as the city jail. A high volume of large debris in the waste water at CCDC must be macerated before being discharged into the City sewer. A design/build project was commissioned at CCDC to replace an existing macerator/pump system which was failing. (more…)
Many control options are available to system designers these days. We will discuss soft starts, variable-frequency drives, and multiple pump systems.
Soft starters, reduce the current inrush and therefore the startup torque for electric motor drives. The reduced torque and current help increase the life and reliability of the pump and motor and system components. The lower current increases the life of the motor windings. The reduced torque pulse improves the life of all of the mechanical components as well as reducing the pressure pulsation that can cause water hammer in the system.
Variable Frequency Drives (VFD)
The VFDs have many of the advantages of soft starters but add the ability to control the motor speed by varying the drive output frequency to the motor. (more…)
We offer custom or standard control panels to meet your exact requirements. Our control panels can meet your exact specification for your project and for every application. (more…)
When pumps operate away from their BEP, the pumps will generate uneven pressure forces inside the volute casing causing a radial thrust load on the impeller. The radial thrust load has many detrimental effects on the life of the pump. The first and most obvious is a loading on the bearings. Increased radial loads cause higher bearing reaction forces decreasing the life of the bearing. The force applied to the impeller increases as we move further and further away from the best efficiency point. Another problem caused from radial loading is the slight bending of the pump shaft, causing the seal faces to wobble back in fourth to stay within close proximity to each other. This causes mechanical damage to the seal due to the oscillating loads, but also allows debris to enter the seal faces. This leads to scoring of the seal faces and/or deposits becoming lodged in the faces that hold them open an cause a leak path. Additionally contact between the impeller and wear ring surfaces adds to the efficiency losses in the pump and additional vibration adding to bearing and seal failures. Below is a diagram the shows the variation of radial load with flowrate for several casing styles. Most submersible designs use the single volute style casing. As you cans see the loading is at a minimum near the BEP but as we move to higher or lower flowrates the loading increases substantially. (more…)
The job of the inlet is to convey the liquid from the inlet pipe to the impeller entrance in a fashion that imposes minimal loss, and creates the most uniform velocity profile at the impeller entrance. Therefore, the ideal inlet geometry is a straight pipe entrance with a slight taper from the pipe flange to the impeller eye. The taper slightly increases the velocity and tends to stabilize the fluid streamlines prior to the impeller.
All curved inlets cause at least a minor penalty and in some cases a major efficiency penalty. This includes straight inlets with an elbow attached close to the suction flange. It is preferred to have at least 5 diameters of straight pipe the same size as the inlet flange, leading up to the pump inlet to prevent non-uniform velocity profile at the impeller eye. With submersible pumps the inlet configuration is planned for you by the manufacturer based on the mounting of the pump. Additional features may needed to be included in a tank mount to optimize the operation of the pump.
Selection of the proper type of impeller for your application can have a significant bearing on the applications ultimate success.
We desire high efficiency but also need good reliability and a minimal amount of ongoing maintenance. All of these considerations come into play when selecting the right impeller style.
Often in the sewage or wastewater industry impellers are designed with a minimal number of vanes to allow particulate to pass without fouling the impeller. Some designs have only one vane that wraps around the impeller. More commonly, two and three vane designs are used to improve performance while still allowing the passage of solids. A common and criteria for this style of pump is that it can pass a 3 inch diameter solid without fouling the pump. This requires that a three inch marble can be rolled through the impeller passage without becoming stuck. Be aware that many of the new higher efficiency multi-vaned impeller designs can no longer pass a 3 inch solid. If that is an important criteria for your application be sure to check with the manufacturer to see that the pump can pass a actual 3 inch spherical solid. Generally these impellers are of the closed impeller design. This allows them to maintain clearances in abrasive environments without the need of continuously replacing wear plate and impellers.
When selecting an electric motor it is important to select a motor that can develop enough horsepower to drive the pump. Often motors are selected to be non-overloading at the end of curve. This means that even at the maximum power requirement for the pump, the motor is large enough to drive the pump without overloading. In submersible pumps there are several important factors that come into play for proper selection. We will start from the top of the motor and work our way down. (more…)
Jensen Engineered Systems has submersible pumps for all types of water & wastewater applications for submersible package pump stations and lift stations. Our wide hydraulic capabilities (along with an extensive product line including grinder, chopper, non-clog, submersible, and dry pit pumps) allows Jensen Engineered Systems to aid in the selection to find the most efficient and reliable pump for your project. (more…)