What is Dry Running?
The meaning of dry running a pump refers to the absence of liquid internally while it is in operation, resulting in an increase in flow, pressure, and risking the pump from overheating, causing damage to internal components as a result. There are however ways to avoid your pump running dry including choosing the right pump and accessories for your application so that it can operate smoothly.
Can all Pumps Dry Run?
Although dry running a pump should be prevented, there are however some ranges that accommodate for dry conditions inside the pump using built-in protection. These include Diaphragm pumps and Peristaltic Pumps which can run dry for any length of time. The design of these pumps means that if dry running does occur it will not affect the quality of the internal parts.
Here at TS pumps, we supply these ranges from some of the best manufactures, providing our services on a global scale.
What damage can happen from dry running a pump?
One of the most common outcomes of dry running your pump is the internal components becoming extremely hot causing them to melt or seize up onto the motor shaft. There is potential for this to happen with Centrifugal pumps, Rotary vane pumps and Gear pumps due to them not have capabilities on dry running effectively if no additional controls are fitted.
What causes a pump to run dry?
Having a pump run dry can be inconvenient, wasted pump energy and time-consuming to fix. So, it is important to know what is best to avoid it to allow operations to run smoothly and minimise downtime. Depending on how big your pump is, will determine how much damage is done from dry running with the wrong pump. For example, if the pump is one of the bigger sizes from the range, damage will occur a lot faster due to heavier moving parts. Typically, pumps will run dry when they have been left for extended periods of time without proper controls in place. If dry running only occurs for under a minute, it usually will not be long enough to cause any damage to the parts.
How to prevent dry running?
Certain pump manufactures will have to install an accessory device onto the pump to ensure it cannot carry on operation when there is no fluid present. For example, a rotary lobe pump would require additional protection to prevent dry running from occurring. There are a variety of options available to suit your application including the following:
- Frequency inverters – used for pumps with three-phase motors to alter the frequency, improving speed operation. Feature a start/stop button for control over operation times.
- Flow/pressure switches
- Batch control system –
By adding simple pump accessories to your pump, you will be able to reduce the risk of dry running ruining your pump and potentially wasting energy and money in your application process.
If you are looking for a reliable pump service that can provide you with the perfect solution for your application, get in contact with us today.