Many industrial, chemical, power generation, mining, and marine heat transfer applications require the use of low conductivity water for cooling media. Low conductivity water is also referred to as deionized (DI) or demineralized (DM) water. Deionized water has had the majority (if not all) cations and anions removed, thus greatly reducing its ability to transfer electricity. Demineralized water has been purified by having all the minerals removed that could negatively affect the fluid process it is used for.

DM water will have higher conductivity than DI water. Tap, stream, lake, sea, and industrial process water contain varying concentrations of particulates (including minerals). These minerals/ions produce an increased electrical conductivity, which in turn can interfere with the electronic apparatus that we are potentially cooling. Furthermore, higher conductivity water can be linked to scale buildup, corrosion and erosion. Consequently, deionized water (treated or mixed with glycol) is required for these critical industrial, chemical, mining, marine, and power generation cooling applications.

Most heat transfer applications requiring deionized water are mission critical and therefore system redundancies and downtime are carefully taken into consideration during cooling system design. Heat transfer system operation and deionized cooling water management require continuous monitoring and tight control of the deionized cooling water conductivity levels and process temperature ranges. The inflow of very low temperature deionized cooling water from the cooling system into the process-equipment can create external condensation on the piping and instrumentation, thus increasing the risk of catastrophic equipment failure by electrical short. 

PumpingSol has designed and built numerous low-conductivity water skid mounted heat transfer systems, using air-to-water, water-to-water heat exchangers (or a combination), in addition to evaporative cooling towers for cooling the non-contact process water. Furthermore, team PumpingSol has engineered, built and tested a number of single loop and dual loop deionized water cooling systems. 

Many single loop heat transfer systems are providing cooling via an air-to-water heat exchanger. In this scenario outside air is used to cool the deionized water via liquid heat transfer coils and forced air. Alternatively, a plate & frame heat exchanger (water-to-water) can utilize available plant (non-contact) water to cool the deionized water. A dual loop cooling system consist first of the “clean water” (deionized water) circle that is cooling the process equipment via a plate & frame heat exchanger. Secondly, an outside “non-contact” water cooling loop pulls the heat from the “clean water” circuit and transfers it to an evaporative cooling tower. The cooling tower’s return water is then sent back to the plate and frame heat exchanger to remove more heat from the process.  


When sizing your low conductivity cooling water skid system, there are a few critical parameters that are required for a well-functioning deionized water cooling water skid system such as:

  • minimum and maximum process temperatures
  • acceptable conductivity levels
  • flow rates
  • pressures

Each cooling system has its own challenges & variables that have to be accounted for such as:

  • simplex or duplex
  • minimum and maximum temperatures 
  • wet-bulb temperatures (for cooling towers) 
  • altitude 
  • wind/seismic 
  • noise restrictions 
  • pollution levels 
  • footprint (space constraints)

When you bring all these challenges to team PumpingSol you can rest assured that our team of experienced engineers & technicians will work closely with your team to offer the best low conductivity cooling water skid system solution for your specific process and location.

PumpingSol has manufactured several deionized water cooling skid systems installed throughout North & South America, with some in operation for over ten years. Please give team PumpingSol an opportunity to help you design and execute your next low conductivity cooling water skid system and you will understand why our clients become long term partners.