Propylene Glycol: Too Much of a Good Thing

Throughout the food processing industry, propylene glycol is used in process heat transfer coolant systems when direct cooling with primary refrigerants is not acceptable, and the use of water alone would be at risk of freezing. After system maintenance or repairs, the propylene glycol and water concentration must be replenished in the system. Yet over time, many forget the specific concentration required, and to make sure they have the freeze protection required, may conclude that a “higher concentration must be better.”  In the August edition of From Experience, Hixson’s Refrigeration Engineering team offer an insightful look at why that isn’t always true…and the effects that improper propylene glycol concentrations can have on the cooling system. Read it today!