Coolant Replacement Frequency Guidelines
The frequency of replacing coolant in a storage tank depends on the coolant type, operating conditions, and system requirements, typically ranging from 6 months to 5 years.
Primary coolant types and their replacement intervals:
- Ethylene glycol-based coolants (industrial machinery): Replace every 1-2 years. Watch for brownish tint, foul odor, or increased acidity.
- Propylene glycol-based coolants (food-grade systems): Replace every 2-3 years, but sooner if contaminated.
- Heavy-duty applications (24/7 operation): Test pH (8-10 ideal) and freeze point annually. Replace if pH drops below 7.
Storage Conditions Matter
Coolant left stagnant in a tank without circulation may degrade faster, forming bacteria or mold—common in humid climates. In such cases, replacement every 6-12 months is safer.
Replacement Procedure
When replacing coolant: fully drain the tank, flush with water or system cleaner to remove residue, and refill with fresh coolant to ensure optimal performance and prevent costly system damage.
Always follow the equipment manufacturer's guidelines, as some systems specify exact replacement intervals based on their design and operating parameters.