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152. Due to environmental and safety concerns, the towing winch drive diesel engine cooling water system is treated with propylene glycol for protection against freezing. According to the illustration, what would be the limit of protection if 40 pints of propylene glycol are used in treating a cooling water system with a volumetric capacity of 10 gallons
A 50% propylene glycol mixture is achieved by adding 40 pints of glycol to a 10-gallon (80-pint) system. Consulting the propylene glycol (PG) curve, a 50% mixture provides freeze protection to approximately -30F, which is the correct limit of protection.
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