Effective water supply for frost protection
When frost threatens, farmers need a reliable solution to protect their crops. Grundfos offers a full range of intelligent pumps and systems compatible with existing frost protection equipment to help ensure you have the water needed to prevent crop damage. From our highly customisable award winning vertical multi-stage CR range, to our stainless-steel SP submersible and end-suction pumps, Grundfos offers a reliable and efficient solution to suit your needs.
Remote product management, temperature sensors, data communication, and automation services can also be integrated for a smart and intuitive pumping solution.
Use our water cycle animation and find which products match your project
Starting with the water network, Grundfos supplies cost effective, reliable and energy optimised pumping solutions for raw water intake; pumping, dosing and disinfection solutions for each stage of the water treatment cycle; and pumps and controls for the entire water distribution system, including main and local pumping stations.
For the wastewater network, Grundfos supplies dependable, energy efficient solutions for wastewater transport and flood control, ensuring that downtime is reduced, and risk minimisation is built into the system.
And at the wastewater treatment plant, Grundfos facilitates reliable operation and low total cost of ownership through a broad range of products and solutions for mechanical, biological and chemical treatment.
Get answers to your questions about this application
We have gathered frequently asked questions and their answers in one place. See the most frequently asked questions below or go to the Grundfos FAQ for a complete list of answers to your questions about our products.
What types of media can I pump with a submersible pump?
Pure, low-viscosity, non-explosive media without solid matter or long fibrers.
If a liquid with a density differing from that of water is to be pumped, the motor power required due to the change in hydraulic power should be taken into account.
When pumping fluids more aggressive than drinking water, the special material construction pump versions such SP N, SP R and SPNE should be used.Read more
Is it possible for submersible motor pumps to run dry?
Dry running of Wastewater Pumps can damage the mechanical seal and the motor. For this reason, the float switches should be arranged so that the fill level in the shaft does not fall below the minimum level required to operate the pump. (See also ‘What minimum fill level is required to properly operate the pump?’). The actual conditions prevailing in the application in question must therefore always be reconciled with the information provided in the operating instructions or the datasheet before initial start-up of the pump.
On submersible well pumps, it is possible for a submersible pump to run dry. This caused by over pumping the well where the depth to water level drops while the pump is running. Until the water level in the well reaches down to the pump intake screen. Often submersible pumps pump more water then recovers into the well. Lowering the pump further down the well is the most common solution. Adjusting tank size and demand cycles also helps.
How do I set the motor protection on a submersible pump?
Setting the motor protection on a submersible pump
The overcurrent release integrated into the motor-protection switch must trip on cold start in less than 10 seconds at five times the maximum motor current stamped on the rating plate.
In order to provide the best possible protection to the submersible motor, the motor-protective switch should be set in accordance with the following guidelines:
1. Set overcurrent release to the stamped maximum motor current.
2. Let the pump run for half an hour at normal power.
3. Set the overcurrent release successively lower until the trip point is reached.
4. After that, set the overcurrent release 5% above this trip point.
If the tripping characteristic of the motor-protection switch does not fulfil these requirements, the motor warranty is void. The maximum adjustment value of the overcurrent release must not exceed the maximum motor current stamped on the rating plate. For motors wound for star-delta start-up, proceed as follows when setting the motor-protection switch, but note that the protective switch setting must not exceed a maximum value of:
Protective switch setting = stamped max. current x 0.58.
The maximum permissible start-up time for star-delta starters or for motor switches with autotransformers is 2 seconds.
Grundfos offers different devices for motor protection like the MP204 module, for further information, refer to CAPS.Read more
Can the pump be operated using a frequency converter?
Grundfos offers numerous speed-controlled pumps that are referred to as ‘E-pumps’ and which come equipped with Grundfos MGE motors with an integrated frequency converter. The manufacturing costs and material inputs are lower compared to pump solutions with external frequency converters. In addition, technical issues that may arise in connection with external frequency converters are avoided.
Finally, MGE motors have numerous additional features and advantages. In the event that no E-pump is available for a specific application, it is generally possible to operate the three-phase industrial motors offered by Grundfos via an external frequency converter. The technical information set out in the operating instructions and datasheet should be referred to in each individual case.Read more