{"id":503839,"date":"2022-05-21T13:06:05","date_gmt":"2022-05-21T17:06:05","guid":{"rendered":"https:\/\/firefighternow.com\/?p=503839"},"modified":"2022-05-21T13:09:43","modified_gmt":"2022-05-21T17:09:43","slug":"what-is-a-bleve-explained","status":"publish","type":"post","link":"https:\/\/firefighternow.com\/what-is-a-bleve-explained\/","title":{"rendered":"What Is A BLEVE? Explained."},"content":{"rendered":"\n<p>Firefighters must be privy to a variety of acronyms, such as BNICE (Biological, Nuclear, Incendiary, Chemical, and Explosive), CFOD, (Commission of Chief Fire Officer Designation), and NTG (nitroglycerin), among many others. Today, we want to talk about one more firefighting acronym, BLEVE. What is BLEVE?<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"200\" src=\"https:\/\/firefighternow.com\/wp-content\/uploads\/2022\/05\/what-is-a-BLEVE.jpeg\" alt=\"\" class=\"wp-image-503899\"\/><\/figure><\/div>\n\n\n\n<p><strong>BLEVE is short for Boiling Liquid Expanding Vapor Explosion, an explosion that\u2019s caused when a vessel with pressurized liquid surpasses the boiling point. BLEVE fire situations may crop up occasionally, so a firefighter must be knowledgeable about these dangerous fires.<\/strong><\/p>\n\n\n\n<p>This guide to BLEVE explosions and fires will explain what causes a BLEVE in great detail. We\u2019ll also talk about how <a href=\"https:\/\/firefighternow.com\/fire-department-ranks-and-structure-a-complete-guide\/\" target=\"_blank\" rel=\"noopener\">fire departments<\/a> respond to BLEVE events, so keep reading!&nbsp;<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_63 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-662171f81ee94\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-662171f81ee94\" checked aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/firefighternow.com\/what-is-a-bleve-explained\/#How_Does_a_BLEVE_Occur\" title=\"How Does a BLEVE Occur?\">How Does a BLEVE Occur?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/firefighternow.com\/what-is-a-bleve-explained\/#Are_There_Signs_a_BLEVE_Will_Happen_What_Are_They\" title=\"Are There Signs a BLEVE Will Happen? What Are They?\">Are There Signs a BLEVE Will Happen? What Are They?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/firefighternow.com\/what-is-a-bleve-explained\/#Do_Firefighters_Respond_to_a_BLEVE_Fire_How\" title=\"Do Firefighters Respond to a BLEVE Fire? How?\">Do Firefighters Respond to a BLEVE Fire? How?<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Does_a_BLEVE_Occur\"><\/span><strong>How Does a BLEVE Occur?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A boiling liquid expanding vapor explosion or BLEVE is just as dangerous as it sounds. During one of these fires, a vessel with pressurized liquid inside like a propane tank exceeds the liquid\u2019s boiling point.&nbsp;<\/p>\n\n\n\n<p>In the case of propane, the boiling point is -43.6 degrees Fahrenheit, but keep in mind that the boiling point for another pressurized liquid can and does vary.<\/p>\n\n\n\n<p>As the boiling point of the liquid increases, so too does the pressure. A canister of propane or another sealed vessel will stay a liquid even in these conditions.&nbsp;<\/p>\n\n\n\n<p>However, once something happens to the vessel, such as someone dropping it, that\u2019s when things change.<\/p>\n\n\n\n<p>Now the structural integrity of the vessel is at risk. The boiling point drops very rapidly, and the pressure decreases just as fast. This causes the liquid inside the tank to become a gas.&nbsp;<\/p>\n\n\n\n<p>The gas will expand at a very fast rate. Combustible gases such as alcohols and hydrocarbons can ignite. Non-combustible gases though may not cause a fire. For example, a steam boiler will produce vapors that don\u2019t catch on fire.<\/p>\n\n\n\n<p>Many more vapors though will cause a fire.&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"200\" src=\"https:\/\/firefighternow.com\/wp-content\/uploads\/2022\/05\/how-to-put-out-a-bleve.jpeg\" alt=\"\" class=\"wp-image-503901\"\/><\/figure><\/div>\n\n\n\n<p>Unlike most fires, heat is not a requirement for a BLEVE. Rather, three criteria must be met. First, the liquid substance must experience a higher-than-usual boiling point.&nbsp;<\/p>\n\n\n\n<p>Second, the pressure can rise, but the vessel must stay intact so the substance can stay a liquid. Then finally, containment loss occurs so the pressure drops quickly.<\/p>\n\n\n\n<p>In some instances, second-stage BLEVEs can follow. The compromised vessel would release vapor to the point where the vapor and the air mix. Ignition then occurs if the vapor is combustible.&nbsp;&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Are_There_Signs_a_BLEVE_Will_Happen_What_Are_They\"><\/span><strong>Are There Signs a BLEVE Will Happen? What Are They?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>As a firefighter, you can\u2019t exactly see into a canister or container to determine whether it may succumb to a BLEVE. That doesn\u2019t mean you can\u2019t rely on other signs to indicate what could be on the horizon.<\/p>\n\n\n\n<p>Here are some symptoms of a BLEVE before a canister ruptures.<\/p>\n\n\n\n<p><strong>Bulges or Bubbles<\/strong><\/p>\n\n\n\n<p>Look at the tank of propane or liquefied petroleum gas. Does the canister now have a significant bulge or several bubbles when none existed before?&nbsp;<\/p>\n\n\n\n<p>This canister is a good candidate for a BLEVE, and one will likely soon occur.<\/p>\n\n\n\n<p><strong>Metal Pieces Around the Canister<\/strong><\/p>\n\n\n\n<p>Even an older metal canister shouldn\u2019t flake, but that can change when a BLEVE is about to happen. You may notice tiny metal pieces around the canister that were not there before.<\/p>\n\n\n\n<p><strong>Canister Discoloration<\/strong><\/p>\n\n\n\n<p>You have a pretty good idea of what color the canister is, correct? If that color begins to change, either lightening or darkening, then prepare for a BLEVE.<\/p>\n\n\n\n<p><strong>Ringing Noise<\/strong><\/p>\n\n\n\n<p>You\u2019ll need a very quiet environment for this, but if you can hear a consistent ringing sound from a metal canister, then an explosion could be imminent.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Do_Firefighters_Respond_to_a_BLEVE_Fire_How\"><\/span><strong>Do Firefighters Respond to a BLEVE Fire? How?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Even though a BLEVE is dangerous, it\u2019s still a firefighter\u2019s job to respond to an emergency call that involves a combustible explosion.&nbsp;<\/p>\n\n\n\n<p>That said, firefighter safety is utterly paramount considering the risks of BLEVEs, including the potential for a second-stage BLEVE.<\/p>\n\n\n\n<p>Here are some firefighter safety tips as your department combats a BLEVE.<\/p>\n\n\n\n<p><strong>Watch Out for Flying Debris<\/strong><\/p>\n\n\n\n<p>Although a BLEVE only occurs when the high pressure in the vessel comes down, the force of an explosion will absolutely lead to flying debris. A firefighter should stay abreast of the risk of flying shrapnel from a variety of directions.<\/p>\n\n\n\n<p><strong>Use Water to Cool the Container<\/strong><\/p>\n\n\n\n<p>Firefighters will want to put out a burning building caused by a BLEVE, but one or two members of the department should also focus their efforts on flooding the vessel or container in which the BLEVE originated.<\/p>\n\n\n\n<p>The purpose of this is to cool down the container to hopefully avoid a second-stage BLEVE.<\/p>\n\n\n\n<p><strong>Do Not Get Close to the Fire<\/strong><\/p>\n\n\n\n<p>We saved what is the most important tip for last. Since the radius of an explosion is hard to predict, when extinguishing a BLEVE fire, the firefighters should never get too close to the source of the blaze.<\/p>\n\n\n\n<p>Rely on monitor nozzles as well as unmanned hose holders to keep all the firefighters a good distance away.&nbsp;<\/p>\n\n\n\n<p>A boiling liquid expanding vapor explosion or BLEVE is a high-risk event that occurs when a liquid\u2019s boiling point raises higher than it should, the pressure increases, and then the structural integrity of the container is reduced so the pressure quickly drops.<\/p>\n\n\n\n<p>Do fires always occur after a BLEVE? No, but for each fire that does happen, the risk is substantial. Contact emergency services immediately if a BLEVE has recently ensued and don\u2019t get close to the canister!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Firefighters must be privy to a variety of acronyms, such as BNICE (Biological, Nuclear, Incendiary, Chemical, and &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"What Is A BLEVE? Explained.\" class=\"read-more button\" href=\"https:\/\/firefighternow.com\/what-is-a-bleve-explained\/#more-503839\" aria-label=\"Read more about What Is A BLEVE? Explained.\">Read More<\/a><\/p>\n","protected":false},"author":2,"featured_media":503899,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What Is A BLEVE? 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