{"id":13934,"date":"2022-04-21T15:12:06","date_gmt":"2022-04-21T13:12:06","guid":{"rendered":"https:\/\/2025.mining-report.de\/english\/?page_id=13934"},"modified":"2022-04-27T11:25:41","modified_gmt":"2022-04-27T09:25:41","slug":"basic-principles-of-explosion-protection","status":"publish","type":"page","link":"https:\/\/mining-report.de\/english\/basic-principles-of-explosion-protection\/","title":{"rendered":"Basic Principles of Explosion Protection"},"content":{"rendered":"<span class=\"tie-dropcap \">W<\/span>hile explosions are fortunately quite rare, if they do happen the consequences are usually serious \u2013 explosions are among the five most frequent causes of fatal accidents. It is therefore extremely important to prevent their occurrence and, if that is not possible, at least to limit their impact and contain their spread.<\/p>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n\n\t\t<div class=\"one_third tie-columns\"><a href=\"\/wp-content\/uploads\/_pda\/2022\/04\/MRG_2202_ISSA_grundlagen_explosionsschutz_220408.pdf\" target=\"_blank\" class=\"shortc-button small white\">Download article as PDF<\/a>\n\t\t<\/div>\n\t\n\n\t\t<div class=\"two_third tie-columns last\"><strong>Author\/Autor:\u00a0<\/strong>Dr. rer. nat. Maximilian Hanke-Roos, Berufsgenossenschaft Rohstoffe und chemische Industrie (BG RCI), Heidelberg\/Germany \n\t\t<\/div>\n\t\t<div class=\"clearfix\"><\/div>\n\t\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n<h4>1\u00a0 How does an explosion occur?<\/h4>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n<figure id=\"attachment_13928\" aria-describedby=\"caption-attachment-13928\" style=\"width: 1100px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/2025.mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_01_gefahrentetraeder.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-13928\" src=\"https:\/\/2025.mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_01_gefahrentetraeder.jpg\" alt=\"\" width=\"1100\" height=\"1101\" srcset=\"https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_01_gefahrentetraeder.jpg 1100w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_01_gefahrentetraeder-300x300.jpg 300w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_01_gefahrentetraeder-1024x1024.jpg 1024w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_01_gefahrentetraeder-150x150.jpg 150w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_01_gefahrentetraeder-768x769.jpg 768w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_01_gefahrentetraeder-70x70.jpg 70w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_01_gefahrentetraeder-400x400.jpg 400w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_01_gefahrentetraeder-600x601.jpg 600w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_01_gefahrentetraeder-100x100.jpg 100w\" sizes=\"auto, (max-width: 1100px) 100vw, 1100px\" \/><\/a><figcaption id=\"caption-attachment-13928\" class=\"wp-caption-text\">Fig. 1. Risk tetrahedron for explosions. Sources (from left to right): olegusk &#8211; stock.adobe.com, stockphoto-graf &#8211; stock.adobe.com, visoot &#8211; stock.adobe.com, Andrew Burgess &#8211; stock.adobe.com, BG RCI \u2013 Soestmeyer<\/figcaption><\/figure>\n<p>The four\u00a0 points of the risk tetrahedron (Figure 1) describe the four conditions that all have to be present simultaneously for an explosion to occur:<\/p>\n<ul>\n<li>combustible hazardous material;<\/li>\n<li>an oxidising agent, e.\u2009g. oxygen;<\/li>\n<li>intermixing in the right ratio; and<\/li>\n<li>an effective ignition source.<\/li>\n<\/ul>\n<p>Combustible materials comprise all those substances that can burn as a result of ignition in the presence of oxidising agent \u2013 this generally involving the oxygen that occurs naturally in the air. Typical examples are the solvents used in paints and coatings, adhesives and cleaning agents along with the dusts that are generated from coal, wood, metal and sugar. For an intermixing to take place between the combustible material and the oxidising agent there has to be an evaporation or vaporisation of fluids or a swirling up of dust. In the case of fluids this is usually determined on the basis of the flash point. This is the lowest temperature at which a fluid is able, under a set of standard conditions, to produce a sufficient amount of vapour to create a mixture that can be ignited. If the prevailing temperature is not safely below the flash point there is a chance that an explosive mixture will be formed. This does not apply to sprayed or atomised liquids \u2013 here the risk of explosion must always be assumed.<\/p>\n<p>Solid materials only represent an explosion risk if they are present in a sufficiently fine state: as the grain size diminishes so the surface area of the dust will increase (Figure 2), thereby allowing the combustion process to proceed more swiftly and ultimately resulting in an explosive development. This is typically the case for particle sizes of less than 0.5 mm.<\/p>\n<figure id=\"attachment_13933\" aria-describedby=\"caption-attachment-13933\" style=\"width: 1166px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/2025.mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_02_korngroesse_staub_DE_EN.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-13933\" src=\"https:\/\/2025.mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_02_korngroesse_staub_DE_EN.jpg\" alt=\"\" width=\"1166\" height=\"693\" srcset=\"https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_02_korngroesse_staub_DE_EN.jpg 1166w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_02_korngroesse_staub_DE_EN-300x178.jpg 300w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_02_korngroesse_staub_DE_EN-1024x609.jpg 1024w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_02_korngroesse_staub_DE_EN-768x456.jpg 768w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_02_korngroesse_staub_DE_EN-600x357.jpg 600w\" sizes=\"auto, (max-width: 1166px) 100vw, 1166px\" \/><\/a><figcaption id=\"caption-attachment-13933\" class=\"wp-caption-text\">Fig. 2. Relationship between the surface area and the grain size of dust particles. Source: Hanke-Roos<\/figcaption><\/figure>\n<p>Such mixtures are generally designated as \u201cexplosive mixtures\u201d. If the mixture in question is present under atmospheric conditions (ambient temperature of \u2013\u200920 to +\u200960\u00a0\u00b0C, air pressure 0.8 to 1.1 bar, oxidising agent air) it is referred-to as an \u201cexplosive atmosphere\u201d. As this tends to be the most common scenario, the following paper will focus exclusively on occurrences of this type. In the case of a hazardous explosive atmosphere they are present in dangerous quantities. A dangerous quantity is said to exist at a volume of \u2265\u200910\u00a0l or \u2265\u20091\/10 000 volume capacity or when it occurs in close proximity to persons.<\/p>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n<h4>2 \u00a0 It\u2019s all about the mixture<\/h4>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n<p>This applies not just to cooking but also to explosion protection. Merely the fact that a combustible material mixes with air is not of itself enough. A mixture of combustible substances with air can only explode when ignited provided that the correct mixing ratio is present \u2013 that is to say when the mix is somewhere between the lower explosive limit (LEL) and the upper explosive limit (UEL). Below the LEL the mixture contains too little fuel, it is too \u201clean\u201d. Above the UEL it contains too much fuel, it is too \u201crich\u201dand \u201conly\u201d burns off instead of exploding (Figure 3). The UEL does not apply\u00a0 to dust mixtures.<\/p>\n<figure id=\"attachment_13929\" aria-describedby=\"caption-attachment-13929\" style=\"width: 900px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/2025.mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_03_EX_grenzen_DE_EN.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-13929\" src=\"https:\/\/2025.mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_03_EX_grenzen_DE_EN.jpg\" alt=\"\" width=\"900\" height=\"984\" srcset=\"https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_03_EX_grenzen_DE_EN.jpg 900w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_03_EX_grenzen_DE_EN-274x300.jpg 274w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_03_EX_grenzen_DE_EN-768x840.jpg 768w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_03_EX_grenzen_DE_EN-600x656.jpg 600w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/a><figcaption id=\"caption-attachment-13929\" class=\"wp-caption-text\">Fig. 3. In the case of gases, vapours and mists the zone between the two explosive limits (UEL and LEL) is designated as the explosive range. Source: Hanke-Roos<\/figcaption><\/figure>\n<p>The final condition for an explosion is an effective ignition source. In practice the following six types of ignition source, out of the total of thirteen, play the greatest role:<\/p>\n<ul>\n<li>hot surfaces;<\/li>\n<li>flames and hot gases;<\/li>\n<li>sources of ignition caused by mechanical friction, impact and severance processes;<\/li>\n<li>electrical equipment;<\/li>\n<li>electrical compensating currents, cathodic corrosion protection; and<\/li>\n<li>static electricity.<\/li>\n<\/ul>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n<h4>3\u00a0 Risk assessment<\/h4>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n<p>The most important tool for gauging and controlling the explosion hazard is the risk assessment process. The measures involved are subject to the order of priority outlined in table 1.<\/p>\n<figure id=\"attachment_13931\" aria-describedby=\"caption-attachment-13931\" style=\"width: 1300px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/2025.mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_tab_01.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-13931\" src=\"https:\/\/2025.mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_tab_01.jpg\" alt=\"\" width=\"1300\" height=\"453\" srcset=\"https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_tab_01.jpg 1300w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_tab_01-300x105.jpg 300w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_tab_01-1024x357.jpg 1024w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_tab_01-768x268.jpg 768w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_tab_01-600x209.jpg 600w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><figcaption id=\"caption-attachment-13931\" class=\"wp-caption-text\">Table 1. Prioritisation of explosion-protection measures with examples of protective actions and reference to the relevant Technical Regulation (based on: KB 028-1 by the BG RCI). Source: Hanke-Roos<\/figcaption><\/figure>\n<p>The best means of protecting against an explosion is not to have anything present that might explode, i.\u2009e. the formation of an hazardous explosive atmosphere is safely prevented. In other words, one of the three corners of the risk tetrahedron, namely \u201coxidising agent\u201d, \u201ccombustible material\u201d or \u201cintermixing in the right ratio\u201d, has to be absent.\u00a0 If this is not the case then the source of ignition has to be prevented, that means the fourth peak of the tetrahedron has to be excluded. If that cannot be reliably achieved measures have to be taken to prevent the propagation of an explosion and to limit its impact.<\/p>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n<h4>3.1\u00a0 First level of measures<\/h4>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n<p>The first level of measures involves preventing the formation of an hazardous explosive atmosphere. The so-called \u201cSTOP principle\u201d is in fact enshrined in the Hazardous Substances Ordinance (GefStoffV). The abbreviation STOP denotes the order of priority for the protective measures to be taken: substitution, technical protective measures, organisational protection measures and personal protection measures.<\/p>\n<p>The primary protective measure is substitution. This involves investigating whether the combustible materials can be replaced, or substituted, with less dangerous substances. This could be fluids with a higher flash point or those that are non-flammable. Granules can be used in place of dusts, while working methods that entail the release of no or fewer substances, e.g., brushing instead of spraying, can\u00a0 offer greater protection.<\/p>\n<p>If a sufficient degree of substitution is not possible then some thought must be given to whether measures such as the sealing of containers or equipment, the removal of dust deposits or the use of natural ventilation can reliably prevent an hazardous explosive atmosphere. In such a case \u2013 which is to be recorded in the risk assessment\u00a0\u2013\u00a0 further explosion protection measures will not be required. Any further measures must be monitored and assessed in order to ensure their effectiveness. They are therefore subject to testing obligations in accordance with Annex 2, Section 3 of the Operational Safety Ordinance (BetrSichV). Such measures may, e.\u2009g., include:<\/p>\n<ul>\n<li>Technical ventilation measures: the use of an extraction or room ventilation system can remove combustible substances from the air or at least reduce their concentration levels. The effectiveness of an extraction or ventilation system can, e.\u2009g., be monitored using gas detectors (for measuring the concentration of combustible gases and vapours) or flow sensors (for measuring the airflow).<\/li>\n<li>Inertisation: inertisation is a process whereby non-combustible substances \u2013 primarily gases like nitrogen and carbon dioxide \u2013 displace the oxygen to such a degree that an explosion can no longer take place. Inertisation can only be employed in enclosed plant sections and the process must be carefully monitored. Inert gases produce a suffocating effect.<\/li>\n<\/ul>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n<p><em><strong>Testing obligation in accordance with Annex 2, Section 3<br \/>\nof the Operational Safety Ordinance (BetrSichV):<\/strong><\/em><\/p>\n<p>Equipment operating in hazardous areas (Ex systems) are subject to regular inspection and special testing requirements apply in this case. The legal basis here is provided by the Operational Safety Ordinance (BetrSichV). The employer is required to define the type, scope and depth of the test, the inspection intervals and the professional qualifications of the persons participating in the testing process. This information is to be recorded in the explosion protection document.<\/p>\n<p>The tests must be carried out<\/p>\n<ul>\n<li>prior to initial commissioning;<\/li>\n<li>after each modification subject to mandatory testing; and<\/li>\n<li>on a recurring basis.<\/li>\n<\/ul>\n<p>The testing and inspection requirements are laid down in the Technical Regulations on Operational Safety (TRBS 1201) part 1 \u201cTesting of equipment in potentially explosive atmospheres\u201d.<\/p>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n<h4>3.2\u00a0 Second level of measures<\/h4>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n<p>The second level of measures is aimed at preventing ignitions occurring. Where an hazardous explosive atmosphere cannot be safely avoided an assessment has to be made as to its frequency and duration of occurrence. Similarly for ignition sources it is necessary to establish how likely it is that such sources are present or can arise \u2013 as part of the process taking place, e.g., when cutting or grinding, or in the event of an equipment fault or malfunction\u00a0\u2013 if they are active and effective.<\/p>\n<p>Workplaces of this kind are identified by the D-W021 warning sign denoting an explosive atmosphere (Ex triangle). Exposed sources of ignition, such as smoking and open fires, are prohibited in these areas and unauthorised persons are not allowed to enter high-risk zones of this kind.<\/p>\n<p>The long-established and well-proven practice of zoning helps to regulate the scope of the required ignition-source prevention measures. This same system is also used in the Technical Rules for Hazardous Substances (TRGS &#8211; 700s series). This division into zones is based on the frequency and duration of the occurrence of a hazardous explosive atmosphere. Here the zones are considered in relation to the operating period of the process in question \u2013 rather than to a timeframe of a week or a year. Zones 0, 1 and 2 apply in the case of hazardous explosive atmospheres that involve a mixture of air with combustible gases, vapours or mists, while zones 20, 21 and 22 are used for hazardous explosive atmospheres in the form of a cloud of dust in air.<\/p>\n<figure id=\"attachment_13932\" aria-describedby=\"caption-attachment-13932\" style=\"width: 800px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/2025.mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_tab_02.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-13932\" src=\"https:\/\/2025.mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_tab_02.jpg\" alt=\"\" width=\"800\" height=\"383\" srcset=\"https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_tab_02.jpg 800w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_tab_02-300x144.jpg 300w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_tab_02-768x368.jpg 768w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_tab_02-600x287.jpg 600w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><figcaption id=\"caption-attachment-13932\" class=\"wp-caption-text\">Table 2. Requirements for the avoidance of ignition sources in relation to the frequency and duration of the occurrence of the hazardous explosive atmosphere and to the zone designation.<\/figcaption><\/figure>\n<p>Operators can then refer to the zone designation in order to derive the most appropriate protective measures \u2013 provided that the emergence of the hazardous explosive atmosphere and the occurrence of an effective ignition source are independent events. The relationship between the emergence of an hazardous explosive atmosphere, the resulting zone designation and the ignition source that is to be avoided is shown in table 2. The portfolio of examples presented in Social Accident Insurance (DGUV) Regulation 113-001 (Figure 4) serves as a useful aid to zoning.<\/p>\n<figure id=\"attachment_13930\" aria-describedby=\"caption-attachment-13930\" style=\"width: 690px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/2025.mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_04_DGUV_Regel_113_001.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-13930\" src=\"https:\/\/2025.mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_04_DGUV_Regel_113_001.jpg\" alt=\"\" width=\"690\" height=\"710\" srcset=\"https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_04_DGUV_Regel_113_001.jpg 690w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_04_DGUV_Regel_113_001-292x300.jpg 292w, https:\/\/mining-report.de\/english\/wp-content\/uploads\/sites\/3\/2022\/04\/ISSA_04_DGUV_Regel_113_001-600x617.jpg 600w\" sizes=\"auto, (max-width: 690px) 100vw, 690px\" \/><\/a><figcaption id=\"caption-attachment-13930\" class=\"wp-caption-text\">Fig. 4. The Explosion Protection Rules (DGUV Regulation 113-001 parts 1 and 2) combine all the technical regulations that relate to protection against explosions. Annex 4 contains the world\u2018s largest portfolio of examples designed to help divide hazardous areas into zones. Further information on zoning and on the avoidance of ignition sources can be found in TRGS 720 and in TRGS 722, TRGS 723 and TRGS 727. Source: DGUV<\/figcaption><\/figure>\n<p>If a firm opts not to employ the zoning system it first has to assume that an hazardous explosive atmosphere is permanently present throughout the entire working area (worst case sce-nario). This means that protective measures have to be adopted in the form of a zone 0\/20 allocation. In individual cases a company can specify other measures as part of its risk assessment strategy provided that these ensure the same level of safety. Examples are activities described in TRGS 507 (\u201cSurface treatment in rooms and containers\u201d).<\/p>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n<h4>3.3\u00a0 Third level of measures<\/h4>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n<p>The third level of measures involves the prevention of explosion propagation and\/or the mitigation of the effects of an explosion. If, in spite of all the steps taken, it is not possible to safely preclude the possibility of an explosion occurring then certain design-related safety measures have to be put in place in order to minimise its potential impact. This means that containers and plant components are to be designed or equipped in such a way that no persons will be injured and that buildings and other structures will suffer the least possible damage in the event of an explosion. Such measures may, e.\u2009g., include:<\/p>\n<ul>\n<li>Explosion-resistant design: the container or installation is constructed to withstand the blast of an explosion.<\/li>\n<li>Explosion relief: here the explosion overpressure is dissipated by means of rupture discs, explosion valves or permanent openings to the atmosphere. The venting system must not pose a danger to any person.<\/li>\n<li>Explosion suppression: measures of this kind identify and suppress a developing explosion before it can achieve dangerous overpressure levels.<\/li>\n<\/ul>\n<p>Measures also have to be put in place to prevent the propagation of an explosive blast to other vulnerable technical areas (explosion decoupling), such as by installing extinguisher barriers, rapid-action mechanical isolation, and rotary valves.<\/p>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n<h4>4\u00a0 Documentation<\/h4>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n<p>Operators are required to record their explosion risk assessment in an explosion protection document, this forming a special section of the documentation of the risk assessment. Further information on this is available in DGUV Information 213-106 \u201cExplosion protection document\u201d. Tests must also be recorded as laid down in the Operational Safety Ordinance (BetrSichV), see TRBS 1201 part 1 \u201cTesting of plant and equipment operating in potentially explosive environments\u201d.<\/p>\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n\n\t\t<div class=\"one_third tie-columns\"><a href=\"\/wp-content\/uploads\/_pda\/2022\/04\/MRG_2202_ISSA_grundlagen_explosionsschutz_220408.pdf\" target=\"_blank\" class=\"shortc-button small white\">Download article as PDF<\/a>\n\t\t<\/div>\n\t\n\n\t\t<div class=\"two_third tie-columns last\"><strong>Author\/Autor:\u00a0<\/strong>Dr. rer. nat. Maximilian Hanke-Roos, Berufsgenossenschaft Rohstoffe und chemische Industrie (BG RCI), Heidelberg\/Germany \n\t\t<\/div>\n\t\t<div class=\"clearfix\"><\/div>\n\t\n\n\t\t<div class=\"clearfix\"><\/div>\n\t\t<hr style=\"margin-top:10px; margin-bottom:10px;\" class=\"divider divider-normal\">\n\t\n","protected":false},"excerpt":{"rendered":"<p>While explosions are fortunately quite rare, if they do happen the consequences are usually serious \u2013 explosions are among the five most frequent causes of fatal accidents. It is therefore &hellip;<\/p>\n","protected":false},"author":25,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[119],"tags":[],"class_list":["post-13934","page","type-page","status-publish","hentry","category-issa-mining"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Basic Principles of Explosion Protection - MINING REPORT<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mining-report.de\/english\/basic-principles-of-explosion-protection\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Basic Principles of Explosion Protection - MINING REPORT\" \/>\n<meta property=\"og:description\" content=\"While explosions are fortunately quite rare, if they do happen the consequences are usually serious \u2013 explosions are among the five most frequent causes of fatal accidents. 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