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id="shareBlock" class="list-inline my-4"><li class="list-inline-item mx-md-2">Share on:</li><li class="list-inline-item mx-md-2"><a href="https://x.com/intent/tweet?text=Learn how to document confined structure fires.&url=https://www.usfa.fema.gov/nfirs/coding-help/csst/" aria-label="share this page on X"><span class="fa-brands fa-x-twitter fa-lg"></span></a></li><li class="list-inline-item mx-md-2"><a href="https://facebook.com/sharer/sharer.php?u=https://www.usfa.fema.gov/nfirs/coding-help/csst/" aria-label="share this page on Facebook"><span class="fa-brands fa-facebook-f fa-lg"></span></a></li><li class="list-inline-item mx-md-2"><a href="https://www.linkedin.com/shareArticle?mini=true&url=https://www.usfa.fema.gov/nfirs/coding-help/csst/" aria-label="share this page on LinkedIn"><span class="fa-brands fa-linkedin-in fa-lg"></span></a></li></ul></div></div><div class="row justify-content-center"><div class="col-12 col-lg-9 col-xl-8 col-xxl-7 articleContent"><p class="lead">This NFIRSGram explains how to identify Corrugated Stainless Steel Tubing (CSST) installation as a contributing factor to a fire using the National Fire Incident Reporting System (NFIRS).</p><p>In the United States, approximately 500,000 new homes per year have CSST installed in them — approximately half of the number of new homes built each year that use gas for heating and cooking. As of 2012, an estimated seven million homes in the U.S. had CSST installed. Since 1989, approximately one billion feet has been installed in residential, commercial and industrial structures. Source: csstsafety.com</p><p>Several jurisdictions have contacted the NFIRS Support Center questioning how they could identify CSST as the possible cause of a house fire. The NFIRS does not specifically list CSST as equipment, and since the issue with CSST is an installation issue, the U.S. Fire Administration recommends the following when identifying CSST installation as a contributing factor in a fire.</p><ul><li>Code “Item First Ignited” as “64” — flammable liquid/gas in or escaping from container or pipe.</li><li>Code the “Equipment Involved in Ignition” as “373” — gas regulator. As this code includes propane, butane, liquefied petroleum (LP), or natural gas regulators and flexible hose connectors to gas appliances.</li><li>Code the “Type of Material First Ignited” as “11” — natural gas for structures being supplied by natural gas or, “12” — LP gas, for structures being supplied by LP gas.</li><li>Code the “Factors Contributing to Ignition” as “43” — installation deficiency.</li><li>In the narrative section of the report, note that CSST was a contributing factor in the ignition of the fire.</li></ul></div></div><div class="mt-4 text-center"><span class="fa-kit fa-flame-colophon fa-3x text-danger my-3"></span></div></section></div></div></main><aside id="aside" class="latestArticles d-print-none"><div class="container"><div class="row justify-content-center"><div class="col-12 col-lg-10 col-xl-9 col-xxl-8"><h2 class="mb-3">Related NFIRSGrams</h2><div class="row row-cols-1 row-cols-sm-2 mb-5"><div class="col mb-3"><div class="card nfirsgram h-100"><div class="card-body"><div class="d-flex justify-content-between align-items-baseline mb-2"><p><small>Nov. 29, 2023</small></p></div><h3 class="h5 balance-text"><a href="/nfirs/coding-help/wildfires/">How to document wildfires</a></h3><p class="small mb-0"><span class="fa-sharp fa-regular fa-tag"></span> <span class="text-nowrap ms-1">Coding</span>, <span class="text-nowrap ms-1">Data Quality</span>, <span class="text-nowrap ms-1">Other Modules</span></p><hr><p>It is important to document wildfires in NFIRS completely and accurately to better understand the impacts they have in our country. Tips on how to code wildfires.</p></div></div></div><div class="col mb-3"><div class="card nfirsgram h-100"><div class="card-body"><div class="d-flex justify-content-between align-items-baseline mb-2"><p><small>Nov. 29, 2023</small></p></div><h3 class="h5 balance-text"><a href="/nfirs/coding-help/lithium-batteries/">How to code fire incidents involving lithium-ion batteries</a></h3><p class="small mb-0"><span class="fa-sharp fa-regular fa-tag"></span> <span class="text-nowrap ms-1">Basic Module</span>, <span class="text-nowrap ms-1">Battery Safety</span>, <span class="text-nowrap ms-1">Coding</span>, <span class="text-nowrap ms-1">Data Quality</span>, <span class="text-nowrap ms-1">Other Modules</span></p><hr><p>Learn how to code a NFIRS report for a fire incident in a vehicle, structure or equipment where a lithium-ion battery is present and involved.</p></div></div></div></div></div></div></div></aside><footer id="footer"><div class="bg-light" id="page-reviewed"><div class="container 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