From owner-freebsd-questions@freebsd.org Mon Jan 8 08:17:34 2018 Return-Path: <owner-freebsd-questions@freebsd.org> Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 66A98E59F61 for <freebsd-questions@mailman.ysv.freebsd.org>; Mon, 8 Jan 2018 08:17:34 +0000 (UTC) (envelope-from bounce_49254060+a.11a6977c3bd0b8d2_11699e4bfc2eb8c_v51@zcsend.net) Received: from sendera51.zcsend.net (sendera51.zcsend.net [135.84.81.51]) by mx1.freebsd.org (Postfix) with ESMTP id 44E466FB34 for <freebsd-questions@freebsd.org>; Mon, 8 Jan 2018 08:17:33 +0000 (UTC) (envelope-from bounce_49254060+a.11a6977c3bd0b8d2_11699e4bfc2eb8c_v51@zcsend.net) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; s=zcp024; d=zcsend.net; h=Date:From:Reply-To:To:Message-ID:Subject:MIME-Version:Content-Type:List-Unsubscribe; bh=fx05tvtsbuLy61IeIXNglUYSyz4=; b=g0TG7almUFuV/n5nYFvSPFqrjRvXXV+FE4RE5nNtvli5erolRb6/5EWVw+Yl2U55sprhwl2un5BA 5Hiz7tbdjxtAAbWl/u60hXuEaO43jLFJLj8LPl3bv8rTryrcy1la/gU4vEGYxMWL91U21Fhc8cKs zAvI7Djia0Op7QvMsf8= Received: from [172.25.237.206] (172.25.237.206) by sendera51.zcsend.net id hackhs28epg3 for <freebsd-questions@freebsd.org>; Mon, 8 Jan 2018 00:07:20 -0800 (envelope-from <bounce_49254060+a.11a6977c3bd0b8d2_11699e4bfc2eb8c_v51@zcsend.net>) Date: Mon, 8 Jan 2018 00:07:20 -0800 (PST) From: "Safety Consultants & Solutions Provider Limited" <info@safetysolutionsng.com> Reply-To: info@safetysolutionsng.com To: freebsd-questions@freebsd.org Message-ID: <zcb.11287eca5d2294.11a6977c3bd0b8d2.1515398840734@zcsend.net> Subject: Forensic Fire Investigation MIME-Version: 1.0 X-JID: 11287eca5d2294.11a6977c3bd013c2 X-campaignid: zohocampaigns.11287eca5d2294.zcb.11a6977c3bd0b8d2.11699e4bfc2eb8c X-Zoho-RID: zohocampaigns.11287eca5d2294.zcb.11a6977c3bd0b8d2.11699e4bfc2eb8c X-Mailer: Zoho Campaigns X-Report-Abuse: <mailto:abuse+11287eca5d2294_zcb_11a6977c3bd0b8d2@zohocampaigns.com>, <https://zc1.maillist-manage.com/campaigns/ReportAbuse.zc?od=11287eca5d2294&rd=11a6977c3bd0b8d2&sd=11a6977c3bd0200b&n=11699e4bfc2eb8c> Content-Type: text/plain;charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.25 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: User questions <freebsd-questions.freebsd.org> List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-questions>, <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions/> List-Post: <mailto:freebsd-questions@freebsd.org> List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help> List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-questions>, <mailto:freebsd-questions-request@freebsd.org?subject=subscribe> X-List-Received-Date: Mon, 08 Jan 2018 08:17:34 -0000 Forensic Fire Investigation=20 This refers to the application of scientific methods & techniques to determ= ine the origin and cause of fire once firefighters have extinguished the fi= re.=20 The practice is similar to the examination of crime scenes in that the scen= e must be preserved and evidence collected and analyzed, but with numerous = additional difficulties and dangers. The investigation will include closely= surveying the damaged scene to establish the origin of the fire and eventu= ally establishing the cause.=20 However in order to effectively examine and evaluate a fire scene, it is im= perative that the investigator has a detailed=C2=A0 knowledge of the chemis= try and behavior of fire and its effects.=20 Understanding The Nature & Chemistry of Fire=20 Fire occurs due to the exothermic reaction of combustion (burning), produci= ng heat and light. In order for a fire to occur, three vital components mus= t be present: a fuel source, an oxidant (O 2 ) and a sufficient amount of e= nergy in the form of heat. Together these make up the fire triangle. A four= th factor can also be described =E2=80=93 a self-sustaining chemical chain = reaction =E2=80=93 to produce the fire tetrahedron. The absence of any of t= hese conditions will result in a fire not starting or extinguishing through= smothering (oxygen removal), cooling (heat removal) or starving (fuel remo= val).=20 Solid and liquid materials do not actually combust, but the process of heat= ing causes them to produce vapors which can burn. This is the process of py= rolysis. Through this pyrolysis products will be formed, flammable and vola= tile substances of low molecular weight caused through the decomposition of= materials by fire.=20 Heat produced by a fire can spread in one of three ways; convection, conduc= tion and radiation. Convection is the transfer of heat through air circulat= ion, and only occurs in liquids and gases. An example of convection is the = heat from a fire rising and heating the ceiling of a room. Conduction is th= e transfer of heat through a medium by direct contact, such as a fire heati= ng a metal beam which transfers the heat elsewhere. Radiation is the emissi= on of heat as infrared radiation without a medium, such as a fire heating a= nd igniting a nearby sofa.=20 Fire Investigation=20 The primary purposes of a fire investigation is to establish the origin (se= at) of the fire, determine the likely cause, and thus conclude whether the = incident was accidental, natural or deliberate. It is vital to establish th= e cause to ensure similar events do not occur (in the case of natural or ac= cidental) or to allow a legal investigation to be conducted (in the case of= deliberate fires).=20 Safety=20 The initial concern with regards to a fire incident scene is safety. Such a= scene has an increased risk factor with possible hazards including heated = materials, structural collapse, damaged electricity and gas mains, debris, = asbestos, dangerous combustion products and other toxic substances. A dynam= ic risk assessment should be conducted, the scene must be declared safe and= all individuals entering the scene should wear appropriate protective clot= hing such as hardhats, fire-resistant overalls, steel-capped boots, thick g= loves and, in some cases, a face mask. Supplies of gas and electricity shou= ld be switched off before the investigation begins.=20 Article by Peace Okorogu SCSP HSE Lead=20 http://safetysolutionsng.com/forensic-fire-investigation READMORE ---------------------------------------------------------------------- This email was sent by info@safetysolutionsng.com to freebsd-questions@free= bsd.org Not interested?Unsubscribe - https://zc1.maillist-manage.com/ua/optout?od= =3D11287eca5d2294&rd=3D11a6977c3bd0b8d2&sd=3D11a6977c3bd0200b&n=3D11699e4bf= c2eb8c Update profile - https://zc1.maillist-manage.com/ua/upc?upd=3D11a6977c3bbf= 0bf9&r=3D11a6977c3bd0b8d2&n=3D11699e4bfc2eb8c&od=3D11287eca5d2294 =20 Impressed?Tell-A-Friend - https://zc1.tell-your-friend.com/ua/forward?od=3D= 11287eca5d2294&rd=3D11a6977c3bd0b8d2&sd=3D11a6977c3bd0200b&n=3D11699e4bfc2e= b8c&s=3Df =20 Safety Consultants & Solutions Provider | 12B, Oguntona Crescent, off Oworo= nshoki Express Way First Pedro Bus Stop, Gbagada, Lagos State, Nigeria.=20