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Get the Best Performance Out of Your Pressure Boosting Pumps


MH_BT4 Series

Give your next light commercial or irrigation job a boost with a complete and versatile solution. Franklin Electric's MH Series and BT4 Series offer a wide array of multi-stage horizontal pumps engineered to meet your pressure boosting needs, delivering nominal flow ratings from 5-90 gpm in ranges up to 7.5 horsepower.

Explore our Compatibility Guide and deliver solutions beyond the pump.

Maximize performance for variable demands when pairing our proven portfolio of booster pumps with the SubDrive family of variable frequency drives that are optimized & trusted for water systems.

Maximize your profit on installations and suggest these systems for:

  • Pressue boosting jobs with steady or variable flow demand with three-phase performance using options for single-phase and three-phase input power
  • Easy plug-and-play constant water pressure solutions with a wide range of settings and proven protections for pumping systems


Introducing Franklin Electric Series VI with New Hydraulic Design


When it comes to performance and efficiency, you count on Franklin Electric to deliver what you need -- with pumps that move water reliably for years to come. That’s why we’re excited to announce the transition of our Water Horse 4” diameter submersible pump line to a new and enhanced hydraulic design that’s been re-engineered using the latest techniques available to improve fluid flow efficiencies. The Franklin Electric Series VI -- a 4” diameter submersible pump line features the best technology and materials available in the pump industry suited for longevity in clean water pumping applications, including:Series Vl

  • All stainless-steel components are 300 series grade or better
  • Industry-standard discharge head and NEMA motor connection bracket produced with proven, reliable and durable materials (available in 300 series stainless steel or engineered thermoplastic resins)
  • Plastic outlet connection pumps have a Flomatic VFD style check valve; stainless steel connection pumps are equipped with a wafer disc-style check valve
  • Pump hydraulics are driven by stainless steel, 7/16-inch hex shaft with a rigid top bearing and splined motor coupling for maximum power distribution efficiency

Series VI pumps will be available in eight performance ranges: 5, 8, 10, 12, 16, 18, 22, or 26 GPM with horsepower ranges from ½ through 5. They have been designed to exceed all industry standards for quality manufacturing processes and operational safety. They will be assembled to our legendary Franklin Electric encapsulated motor for optimal performance.

Download the Franklin Electric's Series VI Cross Reference Guide to easily identify the new model/item numbers and comparable models across series.

For more details, including ordering information and performance curves, visit the Series VI product page. If you have any questions, please contact your local Franklin Electric Sales Representative or Technical Support at 1-800-348-2420.

We're Focusing on the Future: Get Registered for the South Atlantic JUBILEE!


The Driller Jubilee Eblast

Let’s Celebrate the Hard Work Well Drillers Put in Every Day. 
Join us at the Myrtle Beach Convention Center as we support the South Atlantic JUBILEE in elevating the hard work of water well drillers from North Carolina, South Carolina, Virginia, Georgia, Florida, Tennessee and surrounding areas.

Here's what you can expect:

Foster Professional Development with our Franklin Electric Experts (Saturday, July 30 & Sunday, July 31): We’re partnering with the South Atlantic JUBILEE to offer educational workshops designed to reinforce your skills and keep you informed on innovative technologies. Join us for interactive sessions where we’ll answer all your questions and prepare you for the latest trends in the industry:

  • VFDs & Boosting Opportunities, Saturday, July 30 from 8 a.m. to 9 a.m.

Presented by Dave Dumbalough from Franklin Electric

  • The Future of the Water Well Business - Permanent Magnet Motors, Saturday, July 30 from 12:45 p.m.– 1:45 p.m.

Presented by Bob Lilland from Franklin Electric

  • Submersible Motor Troubleshooting - Where to Start and Staying Safe, Sunday, July 31 from 9:00 a.m.– 10:00 a.m.

Presented by Jim Hartmann from Franklin Electric

Explore the Trade Show and Visit Your Partner for Water Systems (Sunday, July 31 & Monday, August 1): Stop by the Franklin Electric Booth #313 to learn more about the latest water system solutions, support tools and Franklin Electric-exclusive services designed to help you in the field and with your business. From groundwater to water treatment and more, Franklin Electric’s diverse product portfolio, combined with industry-leading technical support and service tools, help save you time and money.

Open Booth Hours:

  • Sunday, July 31 from 2:15 p.m. – 6 p.m.
  • Monday, August 1 from 9 a.m. – 2 p.m.

Enjoy through Teambuilding, Networking & Fun (Sunday, July 31): This year’s JUBILEE theme is “Focusing on the Future,” and we couldn’t agree more! That's why we're committed to building a pathway for the next generation of water professionals with continuing education, advocacy and opportunities to connect with others in the industry.

Join at 6:30 p.m. as we proudly sponsor the Worth Pickard Family Picnic. Check out our “Game Zone” where you, your peers and your family can test your skills at several beach-themed activities – complete with surprises for stopping by.

All events subject to change. 

Register NOW at

Submersible Motor Designs: How Their Difference Impacts Pumping Operations


By Jeff Frank

No pumping system is complete without the right motor. It not only drives the pump, but it must also safely and reliably take the static and dynamic loads from the hydraulic stresses of the entire system.

No matter how many motors water professionals have selected and serviced over the course of their career, every pumping job is different – and every application requires different considerations in terms of overall efficiency, reliability, and robustness. This is often where submersible motors stand apart, delivering benefits for pump operators in charge of potable water and irrigation systems, construction sites, mine dewatering among other applications.

What components are part of a submersible motor design?
Submersible motors feature a variety of engineering considerations that set them apart from their surface-mounted counterparts. Because drilling and well construction costs increase dramatically with borehole diameter, submersible pumps and motors are characterized by their slender construction. But appearance is just the beginning of the performance and operational benefits submersible pump systems deliver: 

Electrical designs: induction motors & permanent magnet technology
Not all electrical submersible motors use the same design, and there are several different technologies to choose from, including induction and permanent magnet (PM).

Schaefer Original Motor Drawing

Induction motors have often been considered the workhorse of submersible systems. They often feature a squirrel cage design since there are no electrical connections between the rotor and stator that need to be kept watertight. Additionally, induction motors of this type can be repeatedly produced to ensure high quality and low cost versus other motor designs, making them an accessible solution for pumping system owners and operators. 

Since the motor is induction driven, the rotor turns at less than synchronous speed, which is why this motor type is often referred to as an asynchronous motor. This speed differential is defined as slip. Due to the rotor slip and the shape of the motor’s torque-speed characteristic curve, the motor has very stable operating characteristics, even under short overload and peak load conditions that make it an ideal driver.

When properly selected, the squirrel cage induction motor can easily meet the load demands of a centrifugal pump. However, when used in a standard pressure regulated water system, controlled by a pressure switch and bladder tank, it is best to limit the frequency of motor starts with approximately one minute between consecutive starts to ensure adequate cooling.

PM motors are growing in popularity in submersible applications. Unlike an induction motor where the internal rotor is an electromagnet and becomes energized by the system’s power supply, PM rotors are always magnetized due to the raw material selection. 

These internal magnetic rotors make them more efficient, especially at reduced speeds and partial loads. The inclusion of the rare earth magnet rotor removes the slip factor seen in an induction-style motor. This creates the opportunity to achieve full synchronous rotational speeds in cases where that provides an operational benefit. Another way to view this is that lower input power is required for an equivalent output power produced by an induction design motor — saving on operational costs every time the motor runs. Also, lower current means that specific components of the system — including variable frequency drives, motor cables and filters — might result in smaller size requirements and, consequently, become less costly.

Bearing system
The thrust bearing system handles the static and dynamic axial forces generated by the static and dynamic power needed to pump the water. Depending on the pump’s operation point, the axial shaft force direction can be either towards the motor (downthrust or thrust) or in the opposite direction (upthrust). At start-up, while the pump is still building initial backpressure, the upthrust bearing prevents upward movement of the rotor. 

To handle downthrust during normal operation, a strong, reliable Kingsbury-type thrust bearing carries the load. Based on field experience, the Kingsbury-type thrust bearing is the best solution to fulfil the critical function of thrust load handling due to its high capacity and self-aligning properties. The total load capacities of any specific motor design can vary depending on the motor ratings.

Thrust and radial sleeve bearings are water lubricated. Stainless-steel sleeves in combination with carbon-graphite are often the best choice since the carbon-graphite combines carbon’s strength, hardness, and wear resistance with graphite’s corrosion resistance and self-lubricating properties. While running under water, each of these bearings generates a low-friction film on their smooth surfaces to provide maximum protection through this hydrodynamic seal. Once hydrodynamically separated, the bearing is fully lubricated and can operate continuously in this condition. This means the lifetime of the bearing system is unlimited if external influences such as water hammering, vibration and sand entry can be avoided.

Shaft seal
The shaft sealing system is made of a sand slinger and a fixed, mechanical or lip-style seal. Lip seals are normally supplied as standard. For severe applications in areas with fine abrasives or sand, Silicon-Carbide (SiC) mechanical seals are recommended. 

Stator design options:

Two different motor stator designs are available within the submersible motor world:

Submersible Motor Group Photo 1

  • Dry or encapsulated motors
  • Wet-wound or rewindable motors

The stator of an encapsulated motor is wound with the same magnet wire used in all standard industrial motors. A stainless-steel shell on the outside and a stainless-steel liner inside are welded to end rings at either end of the stator to seal the winding from the outside environment. 

The stator of the wet-wound or rewindable motor is wound with an electrically insulated magnet wire. The wire insulation is polyvinyl chloride (PVC) or polyethylene (PE). The internal liquid fill solution is directly in contact with the wire. In addition to the magnet wire insulation, all internal electrical connections must be isolated to prevent motor grounding.No fluid, either from inside the motor or from the well, can enter the windings. The winding area is then filled with a special encapsulation resin that provides mechanical stability and promotes heat transfer to the outside of the motor. In some cases, the special resin also provides slight protection against voltage surges due to its dielectric properties.

NEMA standards
The North American NEMA (National Electrical Manufacturers Association) standards are accepted as the global benchmark for the pump mounting dimensions of four-, six-, and eight-inch submersible motors. No industry standards exist for larger diameter motors. The NEMA standards specify the flange and splined shaft dimensions of the motors. 

How do the different stator designs compare?

Electromagnetic differences
A fundamental difference between the rewindable and encapsulated motors is in the actual amount of current-carrying copper that can be placed in the motor stator slots. The wire insulation used to build rewindable submersible motors varies considerably from the magnet wire insulation used in encapsulated motors: 0.35 to 0.5 mm/side compared to 0.04 mm/side, respectively. 

This means the encapsulated motor can carry more electrical current while running at higher wire temperatures since there is no wire insulation to be damaged by these temperatures. Overall, this allows for encapsulated motors to operate at greater energy efficiency ratings. On the other hand, rewindable motors built with stator winding wire that is PVC coated must maintain a lower operating temperature to not damage the insulation, and ultimately the motor’s ability to operate. 

The thicker the wire diameter (copper plus insulation) means that less copper is available for power generation. To compensate for this reduced copper volume, rewindable motors will be made longer in many cases. This design helps provide equal power output to the encapsulated submersible motor. To demonstrate this, compare the six-inch diameter, 20 HP, rewindable and encapsulated motor lengths, where the rewindable motor must be 25 per cent longer than the encapsulated motor to provide the same power output.

Thermal characterization of encapsulated motors vs. rewindable motors
As briefly mentioned previously, the most notable difference between encapsulated and rewindable motors is the allowable winding temperature rise. In general, the allowable winding temperature rise for a rewindable motor must be less than the encapsulated motor. For this reason, rewindable motors must run at a temperature closer to the ambient fluid temperature. This also means that encapsulated motors allow for a greater application temperature rise margin before reaching the point of permanent damage.

The lower temperature rise of the rewindable motor does not mean that it is more thermally robust. In fact, the encapsulated motor has a wider temperature operating range, making it more thermally robust, and less likely that it would need to be derated in a higher ambient water temperature. Application Temperatures Margins

As a motor application is analyzed — comparing the water ambient temperature, the allowable winding rise, and the motor’s power output rating — there is generally a linear relationship that can be maintained with respect to the amount of efficiency and performance loss in the system.

Another case when a wider operational temperature margin becomes an advantage is during short-time current overloads, such as at locked-rotor or during an electrical line start. The extra energy is stored in the copper winding as heat. Under these conditions, the amount of heat is measured as a temperature rate-of-rise, and it is proportional to the square of the current density in the copper. Using this, the winding temperature rise can be calculated for each motor type. Under a full voltage, locked-rotor condition, the encapsulated winding heats up at the rate of 19 degrees Celsius/second while the rewindable winding rises at 31 degrees Celsius/second.

Under normal operating conditions, submersible motors and pumps have inherently low internal inertial losses and start very quickly, so the temperature rise during starting is quite acceptable. However, if the motors are not able to accelerate for some reason, the rewindable motor will tend to be more fragile than the encapsulated motor. This is because the rewindable motor has both a lower allowable insulation temperature and a relatively higher rate-of-rise of temperature. 

Despite these differences, it is important to remember that over-heating is the main cause of failure in many applications of submersible motors — so, regardless of construction type, it is recommended to protect both encapsulated and rewindable motors with “quick trip” (must trip within 10 seconds @ 500 per cent IN) overload protection.

Ability to repair/maintain encapsulated motors vs. rewindable motors
When a motor fails, it’s important to quickly determine the cause. If the failure is for reasons related to misapplication or improper installation, all installation deficiencies must be corrected before another motor is installed. Both motor types are repairable and spare parts are often readily available. 

Submersible Motor Installation

The modular concept divides the motor into its main parts: stator, rotor, upper and lower end bell, seals, and bearings. The reliable and proven mechanical parts, end bells, seals, and bearings are interchangeable for both designs. When the failure mode is that of a failed stator, the encapsulated motor’s stator may be replaced or the rewindable motor may be rewound.

An encapsulated motor can be repaired quickly with a factory original stator. 

The rewindable motor is easy to rewind in the field. The ends of the 18-slot stator are open to allow easy removal, reinstallation, and forming of the winding coils. The motors are wound with PVC wire, which is widely available, and the winding data is published. It is important to repair the motor in accordance with factory specifications for materials and winding data. Failure to do so will result in altered motor performance. Repair kits that contain pre-wound coils, slot insulation, and cable splicing materials are available from the factory should you or the repair shop prefer to use factory components.This results in no change in motor performance since each stator is wound using the same raw materials, automated winding lines, and manufacturing processes.

Selecting the best motor to power your submersible pump is a critical consideration to your overall operations. Your motor’s long-term performance – and the performance of your pumping system – relies heavily on having the right configuration for your site and your needs. This is what makes submersible motors a smart choice in many applications. They are more advanced than ever in terms of features and overall operation and offer highly efficient performance. 

Jeff Frank is global product manager at Franklin Electric. He is a mechanical engineer with 15 years’ experience in the water systems industry. He has helped Franklin transition from an OEM component supplier to a holistic water systems pump manufacturer and reseller.

Franklin Electric Expands Production & Warehouse Space in New Olive Branch, MS Facility


Olive_Branch_FacilityAs a result of continued growth and performance, Franklin Electric Co., Inc. announced the relocation of its Rossville, TN manufacturing plant operations to Olive Branch, MS. The move marks an expansion in capabilities and inventory with five times the production area, six times the shipping and inventory capacity, and four times the production capacity. The move secures the required space for producing and storing core large vertical lineshaft and submersible turbines, including the FVT Series, the FAF Series Axial Flow, the FMF Series Mixed Flow and the FST Series.

“This updated facility allows us to significantly increase our machining and assembly capacity and capabilities. We will have adequate space to stock the component inventory needed to support our network of certified Franklin Electric Build Centers; we’ll also have the capability to fabricate pumps equipped to meet the unique performance requirements of large municipal, mining and other industrial applications,” said Mark Heflin, Franklin Electric’s Vice President, Global Product Management. The expanded production footprint allows Franklin Electric to build any turbine in their product line, including vertical lineshaft turbines up to 42 inches.

The larger building and increased capabilities also allow the company to expand their workforce. The city of Olive Branch is only 30 minutes southwest of Rossville, and all current Franklin Electric associates are anticipated to make the move to the more centrally located facility, with additional hires in production, warehousing, and support staff to follow. The facility manufacturers product for the U.S., Canada, Mexico as well as for overseas export. “The Olive Branch facility marks an important investment in our people, their training and the recruitment of additional talent,” said Ryan Johnson, Franklin Electric’s Vice President, Water Systems for the Americas. “It reinforces our commitment to upholding Franklin Electric’s high-quality standards while being attentive and responsive to our customers’ needs.”

Simplified Ordering & Inventory Management with SubDrive Connect Plus™


SubDrive Connect Plus is known for providing an easy-to-use interface in both submersible and surface pumping applications. 

SubDrive Connect Plus

Now, we’re making it even easier to order and stock the SubDrive Connect Plus drives you need – no matter the challenge.

Effective immediately, all SubDrive Connect Plus submersible (“SUB”) models become your single source for simple, powerful constant pressure solutions for water pumping systems in both submersible and centrifugal applications. For this reason, we will be discontinuing all separate centrifugal (“CEN”) SubDrive Connect Plus models, as shown below:

Discontinued Subdrive Connect Plus

What Does This Mean to You?

  • Simplified Ordering & Inventory: Existing “SUB” models deliver a multi-purpose solution that covers both submersible and surface applications, simplifying ordering and inventory management.

If you have any questions concerning these products, please contact your local Franklin Electric Sales Representative or Technical Support at 1-800-348-2420.

How is the Groundwater Industry Doing? (Pump and Energy Efficiency Roundtable)


As featured on Water Well Journal, representatives from leading manufacturers discuss changes that have occurred based on the DOE regulation. Magforce Product Photo

Two years have passed since the U.S. Department of Energy (DOE) created a regulation for improving the overall electrical consumption of a variety of water pumps. Fast forward to today: how is the groundwater industry doing?

"We’re mindful that moving water takes tremendous power, so we need to continue to drive innovation beyond the pump. The use of permanent magnet motor technology is one example; it’s an area where we see the potential for future efficiency gains", reflects Jeff Frank, Global Product Manager at Franklin Electric.

Check out the most recent Pump and Energy Efficiency Roundtable conducted by the National Groundwater Association’s Water Well Journal. Among others, Franklin Electric's manufacturing perspective provides an outlook on energy-efficient products on the market and the next steps for water systems.

Submersible Motor Designs: How Their Difference Impacts Pumping Operations


No pumping system is complete without the right motor. It not only drives the pump, but it must also safely and reliably take the static and dynamic loads from the hydraulic stresses of the entire system. Submersible Motor Installation

No matter how many motors water professionals have selected and serviced over the course of their career, every pumping job is different – and every application requires different considerations in terms of overall efficiency, reliability, and robustness. This is often where submersible motors stand apart, delivering benefits for pump operators in charge of potable water and irrigation systems, construction sites, mine dewatering among other applications.

As featured on Groundwater Canada's article: "Submersible Motor Designs - How their difference impacts pumping operations" learn what components are part of a submersible motor design and how their difference impacts pumping operations. From electrical to stator design options and other components in between, Global Product Manager, Jeff Frank, reflects on the performance and operational benefits that a variety of options deliver.

BT4 Series Multi-Stage Horizontal Booster Pumps Now Cover Flow Ratings Up to 45 GPM


The BT4 Series multi-stage horizontal booster pump line is expanding to cover a wider range of volume needs – from 5 GPM to 45 GPM – giving you the versatility to boost water pressure from city mains to private water systems.BT4 Series 35 45GPM ODP TEFC Group Photo

With this line expansion, the BT4 Series is now available in nominal ratings of 5, 7, 10, 15, 20, 25, 35 and 45 GPM and provides more boosting options to cover light commercial or commercial applications. It is also the ideal multi-stage pump when the job requires more pressure than flow.

BT4 Series Key Attributes (35 & 45 GPM models):

  • Robust stainless-steel bracket, shell & discharge provide optimum corrosion protection
  • Equipped with 1.5" NPT connections at inlet and outlet minimize system friction loss
  • Versatile bracket can be rotated in 90° increments for simplified, compact plumbing arrangements
  • Multiple bracket drain and pressure tappings enable draining in any position and provide for bypass and accessory plumbing
  • Back pull-out design enables motor removal for servicing without disturbing either the pump or plumbing.

Applications (35 & 45 GPM models):

  • Pressure washing buildings and floors
  • Poultry houses
  • Spray cooling equipment
  • Lawn and crop irrigation
  • Evaporative cooling system misters
  • Water circulation
  • General purpose plumbing
  • Reverse osmosis
  • Filtration

Download the latest catalog here: BT4 Series (35-45 GPM) Catalog

If you have any questions concerning these products, please contact your local Franklin Electric Sales Representative or Technical Support at 1-800-348-2420.

Smarter, Connected Pumps Offer Path to Meeting Sustainability Goals


The industry has continued to take steps toward pump system optimization through efficient product and system designs. This trend benefits the user in terms of energy cost savings, ease of installation, and streamlined maintenance.

“When the pump-motor assembly and VFD are designed and built together, they work together more effectively,” he explains. “Maximum efficiency is engineered into the entire system. This benefits the user in terms of energy cost savings, ease of installation and streamlined maintenance.”

As featured in Plumbing & Mechanical Engineer magazine’s article “Smarter, connected pumps offer a path to meeting sustainability goals”, Global Product Manager, Jeff Frank, contributes to the expert discussion and reflects on the role that High Efficiency Systems play among trends and new technologies.

Franklin Installation Exterior 0198 FE Logo 1

PM Engineer's April issue features a pump professional upgrading an existing water system through this installation that enables water supply. Submersible water pumping systems powered with a permanent magnet motor operate at a fraction of the energy consumption when compared to traditional induction systems. When these systems are paired with engineered drives, they can deliver additional benefits as intuitive startup and reliable protection for submersible pumping applications.