Explosion prevention and protection in underground mines - Protective systems - Part 2: Passive water trough barriers

This standard specifies the requirements for concentrated and distributed passive water trough barriers, and quick-deploy water trough barriers. This standard specifies the requirements and test methods for water troughs which are used as components of the "water trough barrier" protective system for underground coal mines. This standard does not apply to active water trough barriers.

Explosionsschutz in untertägigen Bergwerken - Schutzsysteme - Teil 2: Passive Wassertrogsperren

Diese Norm legt die Anforderungen an konzentrierte und aufgeteilte passive Wassertrogsperren und Wassertrog-Schnellsperren fest.
Diese Norm legt auch die Anforderungen und Prüfverfahren für Wassertröge fest, die als Komponenten des Schutzsystems "Wassertrogsperre" im Steinkohlenbergbau unter Tage Verwendung finden.
Diese Norm gilt nicht für aktive Wassertrogsperren.

Protection contre l'explosion dans les mines souterraines - Systemes de protection - Partie 2: Arrets-barrages passifs a bacs a l'eau

La présente norme définit les exigences relatives aux arrets-barrages a eau passifs concentrés, répartis et rapides.
La présente norme définit également les exigences et les méthodes d’essais applicables aux bacs a eau utilisés dans les arrets-barrages a eau dans les mines de charbon souterraines.
La présente norme ne s'applique pas aux arrets-barrages a eau actifs.

Preprečevanje eksplozij in zaščita v podzemnih rudnikih - Zaščitni sistemi - 2.del: Pasivne vodne prepreke

General Information

Status
Published
Publication Date
02-Jul-2007
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
14-Jun-2007
Due Date
19-Aug-2007
Completion Date
03-Jul-2007

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EN 14591-2:2007
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Explosionsschutz in untertägigen Bergwerken - Schutzsysteme - Teil 2: Passive WassertrogsperrenProtection contre l'explosion dans les mines souterraines - Systemes de protection - Partie 2: Arrets-barrages passifs a bacs a l'eauExplosion prevention and protection in underground mines - Protective systems - Part 2: Passive water trough barriers73.020Rudarstvo in kamnolomsko izkopavanjeMining and quarrying13.230Varstvo pred eksplozijoExplosion protectionICS:Ta slovenski standard je istoveten z:EN 14591-2:2007SIST EN 14591-2:2007en,fr,de01-julij-2007SIST EN 14591-2:2007SLOVENSKI
STANDARD



SIST EN 14591-2:2007



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14591-2March 2007ICS 13.230; 73.100.99 English VersionExplosion prevention and protection in underground mines -Protective systems - Part 2: Passive water trough barriersProtection contre l'explosion dans les mines souterraines -Systèmes de protection - Partie 2: Arrêts-barrages passifsà bacs à l'eauExplosionsschutz in untertägigen Bergwerken -Schutzsysteme - Teil 2: Passive WassertrogsperrenThis European Standard was approved by CEN on 4 February 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14591-2:2007: ESIST EN 14591-2:2007



EN 14591-2:2007 (E) 2 Contents Page Foreword.5 Introduction.6 1 Scope.7 2 Normative references.7 3 Terms and definitions.7 4 Construction requirements of water troughs.10 4.1 General.10 4.2 Dimensions, specifications.10 5 Testing of water troughs.11 5.1 General.11 5.2 Construction tests.11 5.2.1 Shape, capacity, dimensions.11 5.2.2 Strength, shape retention.11 5.2.3 Water level indicator.11 5.3 Testing of electrostatic properties.12 5.3.1 Test method.12 5.3.2 Assessment.12 6 Additional fittings for water troughs.12 7 Marking of water troughs.12 8 Construction of concentrated and distributed water trough barriers.12 8.1 General.12 8.2 Framework structures.12 8.3 Arrangement of troughs in the roadway cross-section.13 8.4 Configuration of water trough barriers in mine workings.13 9 Marking of water trough barriers.15 10 Information for use.16 Annex A (normative)
Construction of quick-deploy passive water trough barriers.17 A.1 General.17 A.2 Trough frames.17 A.3 Ropes and chains.17 A.4 Attachment supports.17 A.5 Arrangement of the quick-deploy water trough barriers in the roadway.17 A.6 Volume of water to be contained by quick-deploy water trough barriers.18 Annex B (normative)
Example of acceptable test procedure for water troughs.19 B.1 Testing of heat reaction properties.19 B.1.1 Test procedure.19 B.1.2 Test arrangement.19 B.1.3 Procedure.20 B.1.4 Assessment.20 B.2 Testing of explosion properties.20 B.2.1 Testing of water dispersion.20 B.2.2 Testing the extinguishing efficiency in full-scale tests.22 B.3 Testing of fire-resistance properties.22 Annex C (informative)
Example of marking of water troughs.23 SIST EN 14591-2:2007



EN 14591-2:2007 (E) 3 Annex D (informative)
Examples for configuration of water troughs.24 Annex E (informative)
Example for marking of water trough barriers.44 Annex F (normative)
Instructions for water trough barriers.45 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 94/9/EC.46 Bibliography.48
Figures Figure 1 — Trough group, plan view.9 Figure 2 — Water trough type A (side elevations).10 Figure 3 — Water trough type B (side elevations).10 Figure 4 — General rules for water trough barriers in mine workings.15 Figure A.1 — Quick-deploy water trough barrier (example).18 Figure B.1 — Test arrangement for determining heat reaction properties.19 Figure B.2 — Test arrangement for investigating water dispersion.21 Figure D.1 — Location of water troughs, sectional view.24 Figure D.2 — Arrangement of troughs in roadway cross-section – coverage.25 Figure D.3 — Arrangement of troughs in roadway cross-section – horizontal distances.26 Figure D.4 — Arrangement of troughs in the roadway cross-section – vertical distances.27 Figure D.5 — Arrangement of troughs in the roadway cross-section – vertical distances.27 Figure D.6 — Arrangement of troughs in the roadway cross-section – transverse and longitudinal position.28 Figure D.7 — Arrangement of troughs in the roadway cross-section – Obscurement by supports or fixtures.29 Figure D.8 — Arrangement of troughs in the roadway cross-section – Obscurement by supports or fixtures.30 Figure D.9 — Arrangement of troughs in the roadway cross-section – Obscurement by troughs.30 Figure D.10 — Arrangement of vertically-offset troughs in the roadway cross-section, distance < 1.2 m.31 Figure D.11 — Barrier cordon for a roadway intersection.32 Figure D.12 — Barrier cordon for shafts and insets.33 Figure D.13 — Barrier cordon for closely spaced roadway intersections.34 Figure D.14 — Barrier cordon for closely spaced junctions – Calculation examples for explosion-barrier setting distances.35 SIST EN 14591-2:2007



EN 14591-2:2007 (E) 4 Figure D.15 — Barrier cordon for closely spaced junctions – Calculation examples for explosion-barrier setting distances.36 Figure D.16 — Setting distances for concentrated and distributed water trough barriers.37 Figure D.17 — Roadway drivage with concentrated water trough barriers.38 Figure D.18 — Roadway drivage with concentrated water trough barriers – Calculation examples a) and b).39 Figure D.19 — Roadway drivage with dispersed water trough barrier.40 Figure D.20 — Roadway drivage with concentrated and dispersed water trough barrier.41 Figure D.21 — Water trough barriers at the face/gate intersection.41 Figure D.22 — Explosion barriers in advance gate-roads.42 Figure D.23 — Arrangement of water trough barriers when retreating to the main seam road.43 Figure E.1 — Example for marking of water trough barriers.44 Tables Table 1 — Maximum container dimensions and water content for 40 litre water troughs.11 Table 2 — Container dimensions and water content for 90 litre water troughs.11 Table ZA.1 — Relationship between this European Standard and Directive 94/9/EC.46
SIST EN 14591-2:2007



EN 14591-2:2007 (E) 5 Foreword This document (EN 14591-2:2007) has been prepared by Technical Committee CEN/TC 305 “Potentially explosive atmospheres - Explosion prevention and protection”, the secretariat of which is held by DIN. This document shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2007, and conflicting national standards shall be withdrawn at the latest by September 2007. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. EN 14591 Explosion prevention and protection in underground mines — Protective systems consists of the following parts: Part 1: 2-bar-explosion-proof ventilation structure Part 2: Water trough barriers Part 4: Automatic extinguishing systems for road headers According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. SIST EN 14591-2:2007



EN 14591-2:2007 (E) 6 Introduction Water trough barriers are autonomous protective systems by reducing the effects of combustible dust and/or firedamp explosions in underground mines to a sufficient level of safety. They are used for preventing the propagation of explosions in roadways in underground coal mines. The purpose of water trough barriers is to extinguish explosion flames in roadways in underground mines and in this way to limit propagation of explosions. Water trough barriers are designed and arranged in such a way that explosions are prevented from spreading through dangerous chain reactions and incipient explosions do not become detonations. Water trough barriers will only be effective as a configuration of individual water troughs in accurately defined arrangements. Water troughs are the components for this protective system. Their effectiveness in the event of explosions is based on the distribution of water acting as a fire-extinguishing medium held in individual water troughs, with the blast wave preceding an explosion destroying individual water troughs, thus evenly distributing water, the extinguishing medium, throughout the cross-section of a roadway and extinguishing the explosion flame that follows. The water trough barriers described in this standard are the result of research and testing of many years above ground and underground. The results of these tests can be used as a basis for type examination. SIST EN 14591-2:2007



EN 14591-2:2007 (E) 7 1 Scope This standard specifies the requirements for concentrated and distributed passive water trough barriers, and quick-deploy water trough barriers. This standard specifies the requirements and test methods for water troughs which are used as components of the "water trough barrier" protective system for underground coal mines. This standard does not apply to active water trough barriers. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 13463-1, Non-electrical equipment for potentially explosive atmospheres — Part 1: Basic method and requirements EN ISO 4589-2, Plastics — Determination of burning behaviour by oxygen index — Part 2: Ambient-temperature test
ISO 554, Standard atmospheres for conditioning and/or testing — Specifications 3 Terms and definitions For the purposes of this document, the following terms and definitions apply: 3.1 explosion barrier device intended effectively to suppress coal-dust and firedamp explosions and to limit their physical impact 3.2 water trough barrier explosion barrier in which the extinguishing medium, namely water, is contained in water troughs 3.3 water trough container to hold the extinguishing medium, namely water, together with matching cover 3.4 trough group any troughs located within a roadway section of no more than 3 m in length in the distributed barrier NOTE See Figure 1. A group can be composed of 1 to 3 rows of troughs. 3.5 roadway cross-section area bounded by the roadway floor and lagging or, where no lagging is installed, by the surrounding rock
SIST EN 14591-2:2007



EN 14591-2:2007 (E) 8 3.6 volume of roadway section product of the mean roadway cross-section and relevant length NOTE In the case of concentrated water trough barriers, the relevant length is the distance between the start and the end of the water trough barrier. In the case of distributed water trough barriers, the relevant length is the distance between two adjacent trough groups. 3.7 passive water trough barrier fixed or mobile water trough barrier in which the extinguishing medium, namely water, is dispersed solely by the blast pressure of the explosion 3.8 active water trough barrier fixed or mobile water trough barrier in which the extinguishing medium, namely water, is dispersed independently of the blast pressure of the explosion 3.9 concentrated water trough barrier water trough barrier which contains a minimum of 200 l of water per square metre of roadway cross-section and which has a length of at least 20 m NOTE The concentrated water trough barrier contains a minimum of 5 l of water per cubic metre of roadway section between the start and the end of the water trough barrier. 3.10 distributed water trough barrier water trough barrier which contains a minimum of 1 l of water per cubic metre of roadway section in each trough group measured up to the adjacent trough group NOTE The clear interval between adjacent trough groups does not exceed 30 m (or 50 m in case of cross-sections up to 10 m2). 3.11 quick-deploy water trough barrier quick-deploy water trough barriers are used in the case of rescue action, when concentrated or distributed water trough barriers are not provided between areas where the rescue teams are working and the potential fire source NOTE Quick-deploy water trough barriers contain at least 60 l of water per square metre of roadway cross-section. 3.12 blast pressure pressure exerted by a current of air on a free-standing static plate positioned at right angles to the direction of flow SIST EN 14591-2:2007



EN 14591-2:2007 (E) 9 Dimensions in metres
Key 1 Trough group of one trough row 2 Trough group of two trough rows 3 Trough group of three trough rows Figure 1 — Trough group, plan view SIST EN 14591-2:2007



EN 14591-2:2007 (E) 10 4 Construction requirements of water troughs 4.1 General This component shall be designed and constructed according to good engineering practice. To ensure avoidance of any ignition source, it shall be subjected to a formally documented hazard analysis. Water troughs shall be designed so that, in the event of an explosion, the extinguishing medium they contain, namely water, is released in such a way as to produce an effective quenching action. Water troughs shall be designed so that an adequate dispersion of water is ensured during defined explosion tests with given blast pressures. Water troughs shall be designed or arranged so that it is possible at any time, without removing the covers, to check whether the level of water in the containers is below the minimum level. Water troughs shall be of sufficient strength and stability of shape. Water troughs shall remain functional for as long as possible under the effect of high temperatures. Water troughs shall be made of plastic. Water troughs shall be composed of a material which does not burn spontaneously when subjected to a defined level of exposure to flames. Water troughs shall be designed so that the rate of evaporation of the extinguishing medium, namely water, is as low as possible. 4.2 Dimensions, specifications
Figure 2 — Water trough type A (side elevations)
Figure 3 — Water trough type B (side elevations) SIST EN 14591-2:2007



EN 14591-2:2007 (E) 11 Table 1 — Maximum container dimensions and water content for 40 litre water troughs Container dimensions – max. mm Water trough type a b1 b2 h l1 l2 Capacity l Type A 59 465 270 300 750 525 40 ± 2 Type B 22 320 231,5 330 625,5 556,5 40 ± 2
Table 2 — Container dimensions and water content for 90 litre water troughs
Container dimensions mm Water trough type a b1 b2 h l1 l2 Capacity l Type A 25 ± 2 500 ± 2,5 > 415 275 ± 5 760 ± 5 > 675 90 ± 4,5 Type B 20 ± 2 500 ± 2,5 > 415 320 ± 5 760 ± 5 > 675 90 ± 4,5 The covers shall be designed to give a flush fit with the outer rim of the containers. 5 Testing of water troughs 5.1 General The test pieces for the tests described below comprise one or several water troughs which shall come from the same production run. The number of test pieces required is determined by the respective testing station. When issuing contracts for testing, each testing station shall be provided not only with descriptions and drawings of the equipment (e.g. containers, covers, floats and lid holders), but also with precise data on the composition of the material used. For an example of acceptable test procedures, see Annex B. NOTE Other test procedures are under consideration. 5.2 Construction tests 5.2.1 Shape, capacity, dimensions The specifications laid down in 4.2 shall be used as a basis for testing the shape, dimensions and capacity of the water troughs. 5.2.2 Strength, shape retention When a uniform static load is applied to a stack of water troughs, composed of five containers fitted one inside the other, by a force of 500 N (direction of force at right angles to the container bottoms), the containers shall not suffer damage or permanent deformation. During subsequent unstacking, the containers shall not be wedged together and shall not be damaged. 5.2.3 Water level indicator The minimum water level indicator shall be checked for correct operation and accuracy. The maximum margin of indicator error shall be ± 5 %. SIST EN 14591-2:2007



EN 14591-2:2007 (E) 12 5.3 Testing of electrostatic properties 5.3.1 Test method The surface resistance shall be tested in accordance with EN 13463-1. The test voltage shall be 100 V. The measured value shall be read 60 s after the test voltage has been applied. The measurement shall be carried out in standard atmosphere 23/50-2 according to ISO 554. 5.3.2 Assessment Containers and matching covers, together with all attachments, shall be fitted together in a conductive manner. Conduction shall take place both externally and internally. The water trough being tested meets the requirements when the surface resistance RoA is less than 109 W. 6 Additional fittings for water troughs Water troughs may be provided with additional fittings, such as level indicators and filling and draining devices. These additional fittings shall not conflict with the construction requirements laid down in clause 4. 7 Marking of water troughs Water troughs (containers and covers) shall be marked. An example is given in Annex C. 8 Construction of concentrated and distributed water trough barriers 8.1 General The task of a passive water trough barrier is to fill all the roadway cross-section with water if it is exposed to the explosion blast pressure wave. Water trough barriers comprise troughs which are filled with water (and, if applicable, a permissible additive) and arranged in trough groups. Trough groups are usually formed by special framework structures, shelves or by arranging the troughs on the floor or on appropriate fixtures. These water trough barriers are designated as fixed passive water trough barriers. Water trough barriers will only be effective for extinguishing a fire subject to being arranged as specified in 8.3 and 8.4. 8.2 Framework structures Framework structures shall be capable of supporting the applied load. Each structure normally comprises two beams or one shelf arranged at right angles to the roadway axis and a number of cross-pieces set at right angles to the beams. The framework structures, beams or shelves shall be attached to the supports or to the roadway fixtures by means of suitable mountings. Chains, steel ropes or suspension rods can also be used for this purpose. The framework structures shall be designed in such a way that suspended troughs can be supported on all sides by the full width of their edges, or failing that at least by the full width of their long sides, or that the troughs can be constructed where necessary using battens. SIST EN 14591-2:2007



EN 14591-2:2007 (E) 13 8.3 Arrangement of troughs in the roadway cross-section The number of water troughs in a trough group shall be sufficient to comply with 3.9 and 3.10. The trough groups shall cover the greatest width of the roadway cross-section (floor width or roadway diameter) at the point of installation. The achieved coverage is as follows: ¾ at least 35 % for roadway cross-sections of up to 10 m2 ¾ at least 50 % for roadway cross-sections of up to 15 m2 ¾ at least 60 % for roadway cross-sections of over 15 m2. This calculation is based on measurements taken between the edges of the outer troughs of the trough group at the sides of the roadway. The horizontal distance measured at right angles to the roadway direction ¾ between the roadway wall and the nearest trough shall not exceed 1,2 m and ¾ between two troughs shall not exceed 1,5 m. The total distances shall not exceed 1,8 m. The vertical distance between the bottom of any trough and the boundary of the roadway cross-section shall not exceed 2,6 m in a downward direction nor 2,0 m in an upward direction. If the distance measured in an upward direction from a trough has to be greater than 2,0 m, an additional trough shall be installed. In this case, the vertical distance between the bottoms of the troughs in each row shall be less than 2,0 m. Troughs are normally installed with their long sides at right angles to the roadway direction (transverse arrangement). As a deviation from this, individual troughs can be arranged longitudinally (longitudinal arrangement), though the number shall not exceed half of all the troughs in the group where this is necessary in order to provide cover for the roadway width and to reduce the intermediate spaces. It is permitted to arrange more than 50 % of the troughs in the longitudinal direction if the extinguishing effectiveness is proved by experiments. Troughs shall be arranged so that they are not obscured by supports or by roadway fixtures. Troughs which are spaced less than 1,2 m apart in the direction of the roadway shall not obscure one another. Troughs which are arranged at a distance of < 0,5 m above ot
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