![]() ![]() The issue is that propylene glycol and glycerin are flammable substances that can ignite at a high enough concentration. ![]() ![]() These antifreeze solutions typically contain a mixture of water and either propylene glycol or glycerin at specific ratios. You use it in your car and you may use it in your HVAC system, and the principle is the same in a fire sprinkler system: A solution of a water and an active antifreeze ingredient is flooded into wet pipe systems to keep the water from freezing. Keep reading to understand the issues with flammable antifreeze, and then visit this blog to learn about the first UL-listed antifreeze for use in sprinklers. Important update (2/5/19): A new antifreeze has been listed for use in sprinkler systems. In this blog, QRFS will outline the issues surrounding antifreeze, the National Fire Protection Association’s (NFPA) guidance on using it, and highlight alternatives to safeguard fire protection systems from falling temperatures. But one longstanding option – the use of antifreeze – has fallen out of favor in the past eight years because of its potential to make fires worse. There are a variety of ways to address cold temperatures, including through the installation of preaction and dry systems, thorough insulation of pipes, and creative system design. Whether it’s installed in a commercial space in which climate control is difficult or a home that is left empty on winter vacation, a wet fire sprinkler system must be protected from freezing. Water-filled pipes must stay above 40 F to avoid leakage, a drop in pressure that causes a system malfunction, or significant damage when pipes freeze and burst. Protecting the integrity of pipes in fire protection systems is a challenge in regions that are subject to harsh winters, specifically in structures or areas of buildings that aren’t climate controlled. Because it can ignite, NFPA has limited the use of antifreeze in fire sprinkler systems ![]()
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