The concentration of antifreeze solution is limited to what percentage of glycerin by volume?

The concentration of antifreeze solution, specifically when using glycerin, is typically limited to a maximum of 50% by volume. This limitation is based on performance and operational considerations. Using glycerin as an antifreeze in water-based systems is common as it helps prevent freezing of the water inside the pipes and prevents corrosion.

When the concentration exceeds 50% glycerin, it can begin to affect the effectiveness of the solution in several ways, including lower heat transfer efficiency, increased viscosity, and potential issues with pump performance. Thus, maintaining the correct concentration is essential for the antifreeze solution to function effectively within the fire protection system.

Understanding the applicable limits for glycerin concentration helps in ensuring the efficiency and safety of water-based fire protection systems, which is a fundamental aspect of the inspection, testing, and maintenance processes.