Cooling A Sewage Pump

Overheating pump at sewage facility
Overheating motor at Kuwaiti sewage facility

One of the great things about being an EXAIR Application Engineer is the variety of applications that find their way through our proverbial doors.  In a given day we could be anything from solve static problems for a garment manufacturer to prevent an overheating condition at a pumping station.

The latter of the applications mentioned above has played out over the last few days with an end user of our products in Kuwait.  This end user operates a sewage pumping station which uses 10 dry well pumps located 30m (99 ft.) below ground.  The rooms which house the pumps are not cooled, and as a result, the bearings within the pumps tend to overheat and take considerable time to cool.

What this application needed was an efficient and effective way to cool these motors (and their bearings) from a measured high of 90°C (194°F) to ambient temperatures.  And, when it comes to a convective heat transfer such as that found when cooling by passing an airflow over a material, the greater the volume of air, the greater the cooling.

Enter the Super Air Amplifier.  An air amplifier will multiply the volume of air fed through the unit.  For example, if we supply a 4” Super Air Amplifier with 80 PSIG line pressure, it will consume 29.2 SCFM and move a volume of 730 SCFM at the outlet of the unit.  At a distance of 6” away, the air volume will further amplify to 2,190 SCFM.

What this means for this application, is that we can use a small amount of compressed air to generate HUGE air flows over these motors, bringing down their temperatures and preventing the overheating condition.

If you have a similar application or are in need of a potential EXAIR solution, contact an EXAIR Application Engineer.

Lee Evans
Application Engineer

Cool Motor


One of the best tools we have for Cabinet Cooler calculations is the Cabinet Cooler Sizing Guide (CCSG).  For any given application, this guide (when completed and sent to an EXAIR Application Engineer) provides the necessary details to calculate heat load.

Sometimes, though, we receive these guides for applications better suited to another product.  For example, earlier in the week I received a CCSG for an application needing to keep a motor cool.  The motor is operating outside of the desired temperature range and needs to be cooled down.  A Cabinet Cooler can provide very cold air.  So, it seems like a perfect fit.  But, a Cabinet Cooler has to be mounted and installed on a sealed enclosure.  In an application like this, the Cabinet Cooler will serve little to no purpose.

An Air Amplifier, however, is the perfect fit.  The desired operating temperature of the motor is above ambient, which is a requirement for an Air Amplifier.  It can move enormous amounts of air, but cannot cool the air below ambient temperature.  So, Air Amplifiers have been recommended and are slated for installation.  Another success story on the horizon.

If you have an application which is in need of assistance, don’t hesitate to contact us.

Lee Evans
Application Engineer