Finding the right submersible pump isn’t always easy. If you’re dealing with high temperature liquids, you may experience the frustration of a premature pump failure. Let’s review possible causes.
But first, here are the basics. A submersible pump’s electric motor generates heat that if not dissipated properly can damage the pump. In most applications, the cooler pumped liquid transfers heat away from the motor to maintain the pump within safe operating parameters.
Pumping High Temperature Liquids
Pumping liquids that are hotter than room temperature with a regular submersible pump (or a “high temperature” pump that doesn’t have a high enough temperature rating) can cause a series of issues that may result in catastrophic pump failure, including the following scenario:
- The hotter water limits heat transfer cooling of the motor
- As the motor runs hotter, the seal oil breaks down
- Broken down seal oil doesn’t cool the seal components properly
- As the seals heat up, the seal elastomers break down and cause fluid to leak into the motor chamber
- Fluid in the motor chamber causes the electric motor to short and the pump to fail
High Duty Cycles
High duty cycles can also cause premature failures with submersible pumps. A pump’s duty cycle is the frequency and duration of the pump’s running time. If your duty cycle has frequent starts or long run times, the motor may run hotter. This leads to motor failure.
High Endurance for Corrosion Protection
Another factor in selecting the right pump is understanding the impact of pumping corrosive materials. For example, in many food and beverage applications, frequent washdowns include corrosive cleaning agents that change the pH of the pumped liquid. Stainless steel pumps are an effective solution for corrosive materials. However, stainless steel pumps dissipate heat at ~1/7th the rate of cast iron pumps. This may again lead to motor overheating and eventually pump failure.
The One Key Question You Need to Ask
Do you have a pump that meets your application needs? Many pump providers claim to offer high temperature pumps, but you need to ask the specific temperature and duty cycle for which their pumps are rated. BJM Pumps’ high temperature/high endurance pump design offers a reliable solution to one of the most common submersible pump failure modes. BJM Pumps uses a proprietary manufacturing process to offer high temperature, high endurance pumps that are rated for continuous duty at temperatures up to 200 degrees F, including stainless steel corrosion resistant pump options.
With our 35 years of experience, we understand the issues you deal with every day and design solutions for the pump you need, guaranteed. Contact us or call 860-399-5937 for more information.