EHsp Horizontal Self-Priming Multistage Pumps in action at the Civil Protection in Longare (Vicenza Italy)
Franklin Electric is committed to man and nature, and so is the Municipal group of Civil Protection Colli Berici OdV in Longare. Franklin supports the association with equipment. A pump has now been installed to supply clean water to the group’s headquarters.
Clean water thanks to Franklin
The group of Civil Protection Colli Berici OdV needed a surface centrifugal pump and contacted Franklin Electric in Dueville with a request for a technical proposal. Franklin Electric had already supported the volunteer group in the past and immediately offered its help. In July 2020, after reviewing the situation, the Franklin Electric team installed a single-phase EHsp type self-priming pump with a 24-liter tank, pressure switch and pressure gauge.
The pump, which is connected to an existing pipe system, draws clean water from a well about 5 meters deep, which in turn is fed by a resurgent water vein. The pump was installed above the well in a soundproof and insulated cabin.
The water is used to wet the green area around the group headquarters and to wash the vehicles and equipment used during the activities. A water analysis is now organized to find out whether the water has drinking water quality. If so, it can be used to supply the hydraulic system of the headquarters.
Based on the technology of the horizontal multistage EH pump, the EHsp has a design innovation. A special elastic valve allows air that is present in the system to escape in less than 5 minutes and up to 7 meters of ascent. During start-up, this elastic valve, located in the first stage, opens to let the air escape from the system and suck water into the pump. When the pressure arrives at a certain point, the valve closes and the pump reaches the required performance. These functions make the pump a reliable partner on the premises of the Colli Berici group.
The headquarters of the Colli Berici OdV group is located in a 14th century house originally built by the Magistrato delle Acque of the Serenissima Republic of Venice to control and regulate the waters of the Bacchiglione (which flows below and next to the house) and the Tesina, which flows into the Bacchiglione at about 150 meters upstream.
Voluntary help in times of Corona
Since the Colli Berici OdV Civil Protection group is an integral part of the community in which it operates, during the recent Covid 19 pandemic, the volunteers kept the population informed of the government’s precautions and distributed protective masks, food and medicines to the elderly or needy people.
The group was contacted by some local tailors who donated washable and reusable masks. A sales campaign for the masks was then organized with the aim of raising funds for the purchase of two automatic defibrillators, which then were installed in easily accessible public spaces and are used in case of emergency (after appropriate training).
At Easter, during the shutdown, the group distributed the typical Italian Easter cake Colomba, and in agreement with the Municipality, to children under 6 years of age, who were particularly affected by the lock-down and were unable to meet peers. In gratitude, the children gave the volunteers pictures and drawings that now decorate the walls of the group’s headquarters.
The group has no direct source of income to finance the activities itself. Therefore, the members provide services that are not part of the standard activities defined by the Italian Civil Defense Office. These activities are carried out aside from the group in order to receive donations in return, which are used to purchase or maintain equipment such as safety equipment, tools or clothing.
For these reasons, the OdV Civil Protection Group Colli Berici is »proud to count on a partner like Franklin Electric, which has not only its technical competence but also a particular sensitivity to environmental issues, taking into account the needs of the municipality of Longare and the service ideals of the local Civil Protection Group«. the Mayor of Longare during the handover of the pump in July said.
Franklin motors maneuvering a submarine in 1000 meters under the sea
The technically unique submarine LULA1000 is the heart of the Rebikoff-Niggeler Foundation (FRN) , a non-for-profit organization for marine research based on the Island of Faial in the Azores/Portugal. On board are 5 Franklin Electric 4" encapsulated motors for the main drive as well as the maneuvers in all axes.
The interior has a special ergonomic design for maximum comfort during the long dives with an average duration of five hours. It has excellent maneuverability, even in difficult underwater terrain. Before the LULA1000 actually dives into the deep sea, multibeam sonar surveys are carried out to create bathymetric maps, which can then be used to identify areas of special interest.
LULA1000 is a stable work platform which was built according to the rules of the classification society Germanischer Lloyd (DNV-GL), who carries out yearly inspections and tests. These rules are very strict and have been established to guarantee a safe operation.
Looking for a cost-effective, yet reliable motor to drive the submarine’s positioning propellers, the designers approached Franklin Electric in 2009. Although the requested use lies well outside the scope of the original motor design, Franklin Electric engineers were appealed by the challenge to see their creation working on board of a submarine. With minimal modifications, Franklin Electric 4" submersible motors are now part of a 11-year success story.
The LULA1000 can take three people to a depth of 1000 m. The submarine is equipped with a large viewport of 1.4 m in diameter and the latest technology to collect oceanographic data and samples. It is perfectly prepared to take high-quality video and audio documentation about deep-sea animal life and behaviour.
Franklin Electric motors on board
LULA 1000 is maneuvered by 5 submersible motors 2.2 kW each. The electrical winding design was modified to match the submarine on-board voltage, the mechanical design remained almost unchanged. Like the standard deep well motors, these motors were 100 % factory tested before being delivered to the building shipyard.The Franklin motors are used for the main drive and for the maneuvers in all axes. A planetary gear is used in the LULA1000 to drive a large diameter propeller. This is the main propulsion unit and has the advantage that the submarine can accelerate and stop quickly. Small, directly driven propellers are used for the lateral and vertical drive.
After more than 180 successful dives, these motors are now being replaced as part of a larger submarine overhaul.
In addition to the overarching vision of being able to offer clean drinking water to everyone, Franklin Electric also has the goal to contribute to the sustainability of the planet. Of course, this also includes the world’s oceans. Franklin is therefore happy to be able to support such projects.
Energy Savings was halved due to 6" High Efficiency System
In times of rising energy costs, new systems put more and more emphasis on the best possible efficiency. Here, Franklin Electric has set a new benchmark with its High Efficiency Systems (HES) up to 150 kW. Compared to standard asynchronous motors, energy savings of more than 20% have been achieved in numerous systems installed.
This application example at a Waterworks Association in Germany proved that with the new method of operation with a 6" system the energy consumption was even halved. The reduction due to motor technology comes from a constant good efficiency throughout the entire performance range as well as perfectly balanced electronic components.
Franklin Electric installed and put into operation a 6" 15 kW Franklin Electric High Efficiency System, consisting of a 304SS NEMA synchronous submersible motor (3000 l/min), an IP66 Variable Frequency Drive (VFD) and an IP54 du/dt output filter.
- 10 stage 60 m³/h borehole pump with asynchronous submersible motor installed at 31 m below ground
- Well diameter of 400 mm and depth of 50 m with continuous OBO filter
- Minimum cooling flow alongside the motor is granted with the help of an additional cooling sleeve
- The installation is remotely operated
- Due to intake requirements as well as geological characteristics (water quality, well yield etc.) the pump has to constantly deliver 40 m³/h into a manifold pipe. Depending on additional wells being connected, the delivery head varies between 57 to 91 m. As these required duty points are not directly on the Q/H curve, the volume has to be throttled mechanically.
- In two years observed the pump ran an average of approximately 200 hours per month with an input of P1 = ~20 kW (see graph 1).
- 5 stage 60 m³/h borehole pump (existing) with a Franklin Electric HES installed at 31 m including the existing cooling sleeve.
- Due to limited space the electronic parts (VFD in IP66 and du/dt filter in IP 54) were mounted outside the existing cabinet directly to the wall.
- At a rotating speed of 48.2 Hz, the newly chosen pump accurately meets the duty point I of 40 m³/h at 91 m (see green solid curve).
- The rotational speed will be adjusted by the preset process reference 40 m³/h (read by existing flow control unit) in case of changing operational conditions/pumping heads. Duty point II at 39.7 Hz for 40 m³/h at 57 m (see blue solid curve).
- Due to the reduced rotation speed, the efficiency curve “moves” left resulting in an improved hydraulic efficiency compared to nominal load (see blue dotted curve).
- These two duty points can now be achieved with an input of P1 = 9.5 and 16.2 kW respectively (see graph 2).
Energy savings through highly efficient system:
Due to this new method of operation, the pump now works at an average input of P1 = ~10.3 kW. Thus, the energy consumption is halved (~ 80 % reduction caused by the speed control and ~20 % due to new motor technology).
The savings from motor technology are primarily due to the consistently good efficiency across the entire performance range and the perfectly matched electronic components (see graph 3).
The start-up went quickly and smoothly because of the custom-designed VFD software specifically developed by Franklin Electric.