BS-EN-12065-1998.pdf
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12065 : 1998 The European Standard EN 12065 : 1997 has the status of a British Standard ICS 13.220.10; 75.180.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Installations and equipment for liquefied natural gas Ð Testing of foam concentrates designed for generation of medium and high expansion foam and of extinguishing powders used on liquefied natural gas fires Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 14:53:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 February 1998 BSI 1998 ISBN 0 580 28946 X BS EN 12065 : 1998 Amendments issued since publication Amd. No.DateText affected National foreword This British Standard is the English language version of EN 12065 : 1997. The UK participation in its preparation was entrusted to Technical Committee GSE/38, Installation and equiment for LNG, which has the responsibility to: ±aid enquirers to understand the text; ±present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; ±monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index', or by using the Find' facility of the BSI Standards Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 18, an inside back cover and a back cover. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 14:53:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CEN European Committee for Standardization Comite  Europe Âen de Normalisation Europa Èisches Komitee fu Èr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12065 : 1997 E EUROPEAN STANDARDEN 12065 NORME EUROPE ÂENNE EUROPA ÈISCHE NORM September 1997 ICS 13.220.10; 75.180.01 Descriptors: Gas installation, liquefied natural gas, fire, fire protection, extinguishing agents, foam extinguishers, dry powder extinguishers, operating requirements, tests, test equipment, effectiveness, accountancy, acceptability English version Installations and equipment for liquefied natural gas Ð Testing of foam concentrates designed for generation of medium and high expansion foam and of extinguishing powders used on liquefied natural gas fires Installations et e Âquipements relatifs au gaz naturel lique Âfie  РEssais d'e Âmulseurs destine Âs a Á la production de mousse haut et moyen foisonnement et de poudres extinctrices utilise Âs sur feux de gaz naturel lique Âfie  Anlagen und Ausru Èstung fu Èr Flu Èssigerdgas Ð Eignungspru Èfung von Schaummitteln fu Èr das Aufscha Èumen von Mittelschaum und Hochschaum sowie Lo Èschpulvern zur Beka Èmpfung von Flu Èssigerdgasbra Ènden (LNG-Bra Ènden) This European Standard was approved by CEN on 22 September 1997. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 14:53:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 12065 : 1997 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 282, Installation and equipment for LNG, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 1998, and conflicting national standards shall be withdrawn at the latest by March 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4Description of equipment required for the foam concentrate tests4 4.1Components of the foam production unit4 4.2Special equipment required to determine the foam expansion ratio4 4.3Special equipment required to determine the efficiency of the foam on LNG fires4 4.4Other equipment required for the foam concentrate tests4 5Foam concentrate tests4 5.1Measurement of foam expansion ratio4 5.2Evaluation of the efficiency of the foam on LNG fires5 6The foam concentrate test report5 7Evaluation of the efficiency of an extinguishing powder on a free LNG fire6 8Description of the equipment required to test the compatibility between foam and extinguishing powder6 8.1Components of the foam production unit6 8.2Equipment required for the application of extinguishing powder6 8.3Special equipment required for the test6 8.4Other equipment required for the test6 9The test for compatibility between foam and extinguishing powder7 9.1General requirements for performing the test7 9.2Test procedure7 9.3Criterion of acceptance of extinguishing powder7 10The test report for the efficency of the extinguishing powder on an LNG fire7 10.1 Test report7 10.2 Extinction test on a free fire7 10.3 Test for compatibility between foam and extinguishing powder7 Annexes A(informative) General recommendations on the design of the foam generating equipment required for testing8 B(informative) Measuring equipment used to quantify foam production11 C(normative) Measuring equipment used to determine fire conditions14 D(normative) Method of calculating the parameters used to determine the efficiency of the foam concentrate16 E(normative) Special test rig required to test the compatibility between foam and extinguishing powder18 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 14:53:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 12065 : 1997 BSI 1998 1 Scope This European Standard specifies the tests to be carried out in order to assess the suitability of foam concentrates used to produce medium expansion foam (made from foam concentrates conforming to prEN 1568-1) or high expansion foam (made from foam concentrates conforming to prEN 1568-2) and fire extinguishing powder conforming to EN 615 when used alone or in combination on liquefied natural gas (LNG) fires. This standard does not specify the general requirements for foam concentrates given in prEN 1568-1 and prEN 1568-2 or fire extinguishing powder given in EN 615. This standard does not apply to foam concentrates used to produce low expansion foam (made from foam concentrates conforming to prEN 1568-3) which are not used on LNG installations. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 615Fire protection Ð Fire extinguishing media Ð Specification for powders (other than class D powders) EN 1160Installations and equipment for liquefied natural gas Ð General characteristics of liquefied natural gas prEN 1568-1Fire extinguishing media Ð Foam concentrates Ð Part 1: Specification for medium expansion foam concentrates for surface application to water-immiscible liquids prEN 1568-2Fire extinguishing media Ð Foam concentrates Ð Part 2: Specification for high expansion foam concentrates for surface application to water-immiscible liquids prEN 1866Mobile fire extinguishers 3 Definitions For the purposes of this standard, the following definitions, and those given in EN 1160, apply: NOTE. Other definitions will be given in the document WI 00191043 (Fixed fire fighting systems Ð Foam systems Ð Part 1: Components), still in preparation. 3.1 liquefied natural gas (LNG) See EN 1160. 3.2 solution Liquid formed by mixing foam concentrate and water. 3.3 application rate of solution The flow rate of application of the solution, per surface unit area on fire, generally expressed in l/(min´m2). 3.4 foam concentrate ratio Ratio generally expressed in percentage of the foam concentrate volume over the solution volume. 3.5 proportioner A device installed on a pipe to ensure mixing of water with foam concentrate in such a way that the resulting solution presents the desired foam concentrate ratio. 3.6 foam expansion ratio The ratio between the resulting volume of foam and the volume of solution used. 3.7 initial radiation The radiation of the LNG fire not covered with foam, burning in free combustion. 3.8 reduced radiation The radiation of an LNG fire covered with a layer of foam. NOTE. The value of this radiation varies as a function of the thickness of the foam. 3.9 containment of fire A fire is contained when its radiation has been changed from the mean initial radiation to a mean reduced radiation that is 10 % of the mean initial radiation under the effect of the foam discharged. 3.10 control of fire A fire is controlled when its mean reduced radiation is between 10 % and 25 % of the mean initial radiation between two additions of foam. 3.11 free LNG fire A fire where LNG is in free combustion, not covered by any foam. 3.12 mitigated LNG fire A fire where the combustion of LNG is reduced by foam coverage. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 14:53:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 12065 : 1997 BSI 1998 4 Description of equipment required for the foam concentrate tests 4.1 Components of the foam production unit The foam discharge on an ignited LNG pool is obtained by injecting the solution into a foam generator. 4.1.1 Foam generator The foam generator used for these tests shall be of the same type as the equipment installed on industrial sites. The output rate at its rated operating pressure shall be such that the application rate of the solution during testing is between 3 l/(m2´min) and 10 l/(m2´min). 4.1.2 Equipment used to supply the solution to the foam generator The foam concentrate ratio of the solution selected for testing shall be defined either by the foam concentrate supplier or the industrial user, or by mutual agreement between both parties. The solution may be supplied to the foam generator in two different manners: a) the solution shall be prepared in advance by mixing in a container (open or closed tank or equivalent) the water volume required for testing with the quantity of foam concentrate necessary to obtain the desired foam concentrate ratio. The solution shall be used in a time limit specified by the foam concentrate supplier. The prepared solution shall then be transferred to the foam generator via a pump and transfer pipes; b) water shall be supplied to a proportioner by a pump; the resulting solution shall then be transferred to the foam generator via transfer pipes. Annex A provides the general recommendations on the design of the foam generating facilities required for testing. 4.1.3 Measurements to be carried out to quantify the foam production In order to quantify the foam production during testing, the following values shall be measured and recorded: a) the flow rate of the solution; b) the solution pressure at the generator inlet; c) the quantity of foam concentrate used; d) the quantity of water used; e) the temperature of the water used. Annex B provides information on the means and methods that may be used to measure the above parameters. 4.2 Special equipment required to determine the foam expansion ratio The foam expansion ratio shall be determined by releasing the produced foam into an impounding area with a surface area at least equal to 70 m2and a height at least equal to 1,2 m. In any case, the impounding area filling time shall be greater than 45 s. The impounding area shall be calibrated to measure its volume with a precision at least equal to 1 %. 4.3 Special equipment required to determine the efficiency of the foam on LNG fires 4.3.1 Impounding area The fire test shall be performed in a circular impounding area, with a surface area at least equal to 50 m2and a height of 1,5 m. When necessary, the bottom of the impounding area shall be lined with insulating concrete in order to reduce LNG evaporation during impounding area filling. The impounding area shall be fabricated from materials listed in EN 1160. 4.3.2 Measuring equipment The following measuring devices shall be used to determine the condition of the fire: a) eight thermocouples arranged on a vertical mast positioned at the centre of the impounding area; b) four radiometers positioned crosswind on both sides of the impounding area, at a distance from the centre of the impounding area equal to twice the diameter of the impounding area. The values shall be recorded throughout the entire LNG combustion. Annex C specifies the measuring equipment to be used to determine the fire condition. 4.4 Other equipment required for the foam concentrate tests Regardless of the test conducted, the following data relative to the test site shall be measured and recorded with appropriate equipment: a) air temperature; b) water temperature; c) wind speed and direction; d) air humidity. In addition, vid
