The Result: The customer received a heat exchanger that met their size, pressure drop and corrosion requirements.

The manufacturer of dialysis equipment needed a tube-in-tube heat exchanger to preheat the water used by the equipment.

One specification was that the material for the exchanger had to withstand a highly corrosive cleaning solution used to sterilize the machine between patients. Normal stainless steel grades of material would not hold up.

Through research, Delta t discovered a stainless steel material that would withstand the corrosive action of the cleaning fluid. Samples were made for the customer to test. The heat exchange rate passed, the pressure drop was within specification, the tube material passed the corrosion test; however, the weld metal corroded.

Through more consultation, a replacement weld filler wire was selected and another sample made. All tests were completed successfully.