Fahrenheit™ High Temperature
Especially if you’re dealing with a rugged application, you have questions about submersible pumps. We receive a lot of common questions that we’ll begin to address here. We hope that by sharing them with readers, we can make your selection process faster and easier. We’ll also clarifying some issues you may not have thought to ask. We’ll include additional FAQs in future posts.How many starts per hour can a submersible pump handle? Can a cast-iron pump handle more than a stainless steel pump?
Before we delve too deeply into this question, let’s first define what “starts per hour” means. It’s the number of times in an hour that a pump starts pumping and then stops. It’s also known as the “duty cycle”. Both stainless steel and cast-iron BJM pumps are rated for ten starts per hour or fewer.
The quick assumption when it comes to high temperature pumps is that they’re only meant for high temperature liquids (up to 200°F, in BJM’s case). That’s not always the case. There’s a reason that BJM refers to its Fahrenheit pump as a high temperature AND high endurance submersible pump. The “high endurance” part comes into play when the motor produces its own heat that the pump needs to dissipate that has nothing to do with the temperature of the fluid.Diagnosing the Issue
Figuring out that you need a high temperature submersible pump for endurance issues isn’t always easy. There are indications that may point you (or your pump supplier) in that direction.
- Water Temperature Isn’t Hot Enough to Cause Issues: You are experiencing premature failures similar to when pumping hot liquid and the pump can’t dissipate the heat.
When it comes to commercial buildings, many owners need solids handling submersible pumps because of the materials that find their way into the system. But some buildings may have completely different pumps needs due to the way they heat the building or supply hot water. Buildings that receive steam through a regional steam plant or that use boilers require high temperature pumps to handle these hot liquids.Steam Distribution Systems
Many older cities have central steam distribution networks that pipe steam to commercial buildings. The piping comes in through the basement or utility room and branches out to heat exchangers to run hot water or the heating system. Hot water that condenses off of the steam system collects in an expansion or flash tank.