BS EN 12065-1998 Installations and equipment for liquefied natural gas - Testing of foam concentrates designed for generation of medium and high expansion foam and of extinguishing.pdf

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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12065 : 1998 The Eu

2、ropean 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 Testing of foam concentrates designed for generation of medium and high expansion

3、 foam and of extinguishing powders used on liquefied natural gas firesThis 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

4、12065 : 1998 Amendments issued since publication Amd. No. Date Text 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 t

5、he 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

6、 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 St

7、andards 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

8、 2 to 18, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r 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

9、 for CEN national Members. Ref. No. EN 12065 : 1997 E EUROPEAN STANDARD EN 12065 NORME EUROPE ENNE EUROPA ISCHE 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

10、, operating requirements, tests, test equipment, effectiveness, accountancy, acceptability English version Installations and equipment for liquefied natural gas Testing of foam concentrates designed for generation of medium and high expansion foam and of extinguishing powders used on liquefied natur

11、al gas fires Installations et e quipements relatifs au gaz naturel lique fie Essais de mulseurs destine sa l a production de mousse haut et moyen foisonnement et de poudres extinctrices utilise s sur feux de gaz naturel lique fie Anlagen und Ausru stung fu r Flu ssigerdgas Eignungspru fung von Schau

12、mmitteln fu r das Aufscha umen von Mittelschaum und Hochschaum sowie Lo schpulvern zur Beka mpfung von Flu ssigerdgasbra nden (LNG-Bra nden) 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

13、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 t

14、hree 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

15、Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 12065 : 1997 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/

16、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 withd

17、rawn 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, Lu

18、xembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Description of equipment required for the foam concentrate tests 4 4.1 Components of the foam production unit 4 4.2 Special equipm

19、ent required to determine the foam expansion ratio 4 4.3 Special equipment required to determine the efficiency of the foam on LNG fires 4 4.4 Other equipment required for the foam concentrate tests 4 5 Foam concentrate tests 4 5.1 Measurement of foam expansion ratio 4 5.2 Evaluation of the efficien

20、cy of the foam on LNG fires 5 6 The foam concentrate test report 5 7 Evaluation of the efficiency of an extinguishing powder on a free LNG fire 6 8 Description of the equipment required to test the compatibility between foam and extinguishing powder 6 8.1 Components of the foam production unit 6 8.2

21、 Equipment required for the application of extinguishing powder 6 8.3 Special equipment required for the test 6 8.4 Other equipment required for the test 6 9 The test for compatibility between foam and extinguishing powder 7 9.1 General requirements for performing the test 7 9.2 Test procedure 7 9.3

22、 Criterion of acceptance of extinguishing powder 7 10 The test report for the efficency of the extinguishing powder on an LNG fire 7 10.1 Test report 7 10.2 Extinction test on a free fire 7 10.3 Test for compatibility between foam and extinguishing powder 7 Annexes A (informative) General recommenda

23、tions on the design of the foam generating equipment required for testing 8 B (informative) Measuring equipment used to quantify foam production 11 C (normative) Measuring equipment used to determine fire conditions 14 D (normative) Method of calculating the parameters used to determine the efficien

24、cy of the foam concentrate 16 E (normative) Special test rig required to test the compatibility between foam and extinguishing powder 18Page 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

25、 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 standa

26、rd 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

27、 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, s

28、ubsequent 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 615 Fire protection Fire extinguishing media Specification for

29、 powders (other than class D powders) EN 1160 Installations and equipment for liquefied natural gas General characteristics of liquefied natural gas prEN 1568-1 Fire extinguishing media Foam concentrates Part 1: Specification for medium expansion foam concentrates for surface application to water-im

30、miscible liquids prEN 1568-2 Fire extinguishing media Foam concentrates Part 2: Specification for high expansion foam concentrates for surface application to water-immiscible liquids prEN 1866 Mobile fire extinguishers 3 Definitions For the purposes of this standard, the following definitions, and t

31、hose given in EN 1160, apply: NOTE. Other definitions will be given in the document WI 00191043 (Fixed fire fighting systems Foam systems 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 appli

32、cation rate of solution The flow rate of application of the solution, per surface unit area on fire, generally expressed in l/(minm 2 ). 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

33、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 n

34、ot 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

35、 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.

36、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.Page 4 EN 12065 : 1997 BSI 1998 4 Description of equipment required for the foam concentrate tests 4.1 Components of the foam pro

37、duction 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 s

38、hall be such that the application rate of the solution during testing is between 3 l/(m 2 min) and 10 l/(m 2 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 supplie

39、r 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

40、 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

41、 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 produc

42、tion 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 wat

43、er 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 are

44、a at least equal to 70 m 2 and 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

45、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 m 2 and 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 evaporat

46、ion 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

47、 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 measu

48、ring 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

49、) wind speed and direction; d) air humidity. In addition, video equipment shall be used to record all the tests carried out. 5 Foam concentrate tests 5.1 Measurement of foam expansion ratio 5.1.1 General requirements for performing the test The quality of the water used for testing purposes shall be defined either by the supplier of the foam concentrate or the industrial user, or by mutual agreement between both parties. The foam expansion ratio measuring test shall be performed only if the follow