1、DD ISO/TS13075:2009ICS 13.220.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWDRAFT FOR DEVELOPMENTGaseous-mediafire-extinguishingsystems Engineeredextinguishing systems Flow calculationimplementationmethod and flowverification and testingfor approvalThis Draft for Developmen
2、twas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 August2009 BSI 2009ISBN 978 0 580 65687 3Amendments/corrigenda issued since publicationDate CommentsDD ISO/TS 13075:2009National forewordThis Draft for Development is the UK implementation of ISO/TS13075:2009.This p
3、ublication is not to be regarded as a British Standard.It is being issued in the Draft for Development series of publications andis of a provisional nature. It should be applied on this provisional basis,so that information and experience of its practical application can beobtained.Comments arising
4、from the use of this Draft for Development arerequested so that UK experience can be reported to the internationalorganization responsible for its conversion to an international standard.A review of this publication will be initiated not later than 3 years afterits publication by the international o
5、rganization so that a decision can betaken on its status. Notification of the start of the review period will bemade in an announcement in the appropriate issue of Update Standards.According to the replies received by the end of the review period,the responsible BSI Committee will decide whether to
6、support theconversion into an international Standard, to extend the life of theTechnical Specification or to withdraw it. Comments should be sent tothe Secretary of the responsible BSI Technical Committee at BritishStandards House, 389 Chiswick High Road, London W4 4AL.The UK participation in its pr
7、eparation was entrusted to TechnicalCommittee FSH/18/6, Gaseous extinguishing media and systems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsib
8、le for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.DD ISO/TS 13075:2009Reference numberISO/TS 13075:2009(E)ISO 2009TECHNICAL SPECIFICATION ISO/TS13075First edition2009-04-01Gaseous-media fire-extinguishing systems Engineered extinguishing s
9、ystems Flow calculation implementation method and flow verification and testing for approval Systmes dextinction dincendie utilisant des agents gazeux Systmes dextinction centraliss Mthode de mise en uvre des calculs dcoulement, contrle de lcoulement et essai de rception DD ISO/TS 13075:2009ISO/TS 1
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14、dress below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reservedDD ISO/TS 13075:2009ISO/TS 13075:2009(E
15、) ISO 2009 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body int
16、erested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnic
17、al Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the
18、technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. In other circumstances, particularly when there is an urgent market requirement for such documents, a technical commit
19、tee may decide to publish other types of document: an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in an ISO working group and is accepted for publication if it is approved by more than 50 % of the members of the parent committee casting a vote; an
20、 ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting a vote. An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be
21、 confirmed for a further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an International Standard or be withdrawn. Attention is drawn to
22、the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO/TS 13075 was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire fighting, Subcommittee S
23、C 8, Gaseous media and firefighting systems using gas. DD ISO/TS 13075:2009ISO/TS 13075:2009(E) iv ISO 2009 All rights reservedIntroduction The requirement for the guidance and validation tests specified in this Technical Specification arises from the necessity to address the proper design of piping
24、 networks for engineered systems. The proper design of the piping network and sizing of the nozzle orifices used to control the agent flow is necessary to assure that the agent is distributed properly in the enclosure(s), the minimum nozzle pressure is met and the required discharge time is achieved
25、. The minimum flow calculation requirements and the methods to validate the flow calculations are provided. It is intended that information and experience from the use of this document in practice will be gathered and incorporated into a future revision of ISO 14520-1. DD ISO/TS 13075:2009TECHNICAL
26、SPECIFICATION ISO/TS 13075:2009(E) ISO 2009 All rights reserved 1Gaseous-media fire-extinguishing systems Engineered extinguishing systems Flow calculation implementation method and flow verification and testing for approval 1 Scope This Technical Specification provides recommendations for developin
27、g a flow calculation method for predicting critical flow parameters and an acceptable degree of accuracy for the proper design of piping networks for engineered systems. 2 Normative references The following referenced documents are indispensable for the application of this document. For undated refe
28、rences, the latest edition of the referenced document (including any amendments) applies. ISO 14520-1, Gaseous fire-extinguishing systems Physical properties and system design Part 1: General requirements 3 Terms and definitions For the purposes of this document, the terms and definitions given in I
29、SO 14520-1 apply. 4 Calculation method implementation The following parameters should be considered in developing a flow calculation method (software): a) percent of agent in pipe; b) minimum and maximum discharge time; c) minimum and maximum pipeline flow rates; d) minimum and maximum agent velocit
30、ies in the pipelines; e) variance of piping volume to each nozzle; f) maximum nozzle pressures variance within a pipe arrangement; g) minimum nozzle pressure; h) nozzle and/or pressure-reducing orifices, maximum and minimum area relative to inlet pipes area; i) maximum imbalance agent-arrival time a
31、nd maximum imbalance agent-run-out time between nozzles; j) types of tee splits and related critical lengths; DD ISO/TS 13075:2009ISO/TS 13075:2009(E) 2 ISO 2009 All rights reservedk) tee orientation; l) minimum and maximum flow split; m) pipe and fitting types; n) elevation changes; o) system desig
32、n temperature; p) system operating temperatures; q) maximum pipe pressures downstream of a pressure reducing orifice. 5 Minimum accuracy recommendations 5.1 Recommended design limits for inclusion in the flow calculation method Software The following design limits should be included inside the flow
33、calculation method and verified by testing: a) container volume, fill density, storage pressure and temperature; b) nozzle-area ratio, considering nozzle types and sizes; c) nozzle pressure; d) system discharge time; e) tee split ratios, bull and side tees; f) tee orientations for liquefied gases; g
34、) critical piping distance around tees for liquefied gases; h) degree of imbalance between nozzles for liquefied gases; NOTE This can be expressed as nozzle liquid arrival and run-out time imbalances, by pipe-volume imbalances or other methods used to control the imbalance in pipe layouts. i) minimu
35、m and maximum agent velocities/flowrates; j) percent extinguishant in pipe; k) system pipe volume; l) pipe and fitting types and schedules; m) maximum pressure downstream of a pressure reducing orifice; n) pressure reducer orifice and area ratio. DD ISO/TS 13075:2009ISO/TS 13075:2009(E) ISO 2009 All
36、 rights reserved 36 Recommended testing procedure for system flow-calculation method Software validation 6.1 General 6.1.1 Method 1 This method of validation consists of the following steps. a) Five systems of three or four nozzles (these are the system-manufacturer-submitted tests) are designed uti
37、lizing the flow calculation method that is being validated, constructed and discharge tested. b) A report containing the test-data results and the calculation predictions is sent to the approval authority for examination. c) Upon a positive examination of the pre-witness tests reports, the approval
38、authority proceeds with testing. d) Two of the system-manufacturer-submitted tests are set up and discharge tested to confirm the test results already submitted to the approval authority. e) The approval authority may ask for the design of at least three more tests that include a specific set of des
39、ign limits, in accordance with Clause 4, as stated by the manufacturer. f) The tests shall be designed, constructed and discharge tested with the approval authority present. g) All these tests shall pass the requirements in accordance with Clause 7. h) The system being tested should be maintained an
40、d tested at a design temperature, usually 21 C; however, the test may be conducted at different temperatures with appropriate temperature correction calculations. i) When the flow-calculation software is capable of predicting calculation at temperatures other than the design reference temperature, u
41、sually 21 C, verification tests should be conducted throughout the temperature range specified. 6.1.2 Method 2 Modular validation process for calculation software a) Phase one: The validation process starts with the testing of the components being used in a gas extinguishing system. Therefore, it is
42、 necessary to determine the friction factor of the components and the mass flow at the nozzle. b) Phase two: The incorporation of the determined values into the mathematic algorithm and the physical bases for the flow calculation are check by the approved body. Therefore, it is necessary for the des
43、igner of the software to document the entire mathematical model behind the software. c) Phase three: The validation tests are carried out. Therefore, it is necessary to test at least five different systems; a specific set of design limits in accordance with Clause 4 should be included. All these tes
44、ts shall pass the requirements in accordance with Clause 7. 6.2 System design for testing The systems being tested should be designed at the limits of the flow calculation method software and should consider the hardware limitations. The following flow calculation method design limits should be incl
45、uded in the system piping layouts being tested: a) cylinder volume, fill density storage pressure and temperature; b) nozzle-area ratio (considering nozzle types and sizes); DD ISO/TS 13075:2009ISO/TS 13075:2009(E) 4 ISO 2009 All rights reservedc) pressure-reducing-orifice area ratio, d) maximum pre
46、ssure downstream of the pressure-reducing orifice, e) nozzle pressure for liquefied gases; f) system discharge time; g) tee split ratios, bull and side tees; h) tee orientations for liquefied gases; i) critical piping distance around tees for liquefied gases; j) degree of imbalance between nozzles;
47、NOTE This can be expressed as nozzle liquid-arrival and run-out time imbalances, by pipe-volume imbalances or other methods used to control the imbalance in pipe layouts. k) minimum and maximum agent velocities/flowrates; l) percent of the agent in the pipe or system-pipe volume; m) pipe and fitting
48、 types and schedules and critical distance for liquefied gases. 7 Pass/fail criteria The system-discharge time, the nozzle pressure and the quantity of agent delivered from each nozzle are measured in the discharge tests. These measurements are compared to the predicted values from the software/meth
49、odology with the following pass/fail requirements: a) system discharge time: 1 s, or 10 % of the discharge time relative to the specified value if over 10 s; b) nozzle pressure: 10 % relative to the determined value; c) quantity of extinguishant discharged: 10 % relative to the predicted value; d) maximum pressure downstream of pressure reducing orifice: 20 % relative to the predicted value. These pass/fail criteria should be evaluated with regard to the aim that the calculation method leads to reliabl
