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1、BRITISH STANDARD BS 7346-2: 1990 Incorporating Amendment No.1 Components for smoke and heat control systems Part 2: Specification for powered smoke and heat exhaust ventilators Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:43:42 GMT+00:00 2006, Uncontrolled
2、 Copy, (c) BSI BS 7346-2:1990 This British Standard, having been prepared under the direction of the Fire Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 July 1990 BSI 04-1999 The following BSI references relate to the work on this standa
3、rd: Committee reference FSM/14 Draft for comment 89/47311 DC ISBN 0 580 18815 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Fire Standards Policy Committee (FSM/-) to Technical Committee FSM/14, upon which the following bodies were r
4、epresented: The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Association of Metropolitan AuthoritiesElectricity Supply Industry in England and British Fire Services AssociationWales British Gas plcFire Brigades Union British Retailers Asso
5、ciationHealth and Safety Executive Building Employers ConfederationHome Office Chartered Institution of Building Services Incorporated Association of Architects and EngineersSurveyors Chief and Assistant Chief Fire Officers Institute of Building Control AssociationInstitution of Fire Engineers Consu
6、mer Policy Committee of BSIInstitution of Gas Engineers Department of Education and ScienceInstitution of Structural Engineers Department of HealthLondon Fire and Civil Defence Authority Department of the Environment (Building Loss Prevention Council Research Establishment)National Council of Buildi
7、ng Material Department of the Environment Producers (Construction Industries Directorate)Royal Institute of British Architects Department of the Environment (Property Royal Institution of Chartered Surveyors Services Agency)Scottish Development Department Department of the Environment for Timber Res
8、earch and Development Northern IrelandAssociation Access Committee for EnglandBuilding Services Research and Information Association of Consulting EngineersAssociation Association of Rooflights Manufacturers Flat Glass Manufacturers Association (Arms)Intumescent Fire Seals Association British Automa
9、tic Sprinkler AssociationLondon District Surveyors Association British Council of Shopping CentresSmoke Ventilation Association British Fire Protection Systems Association Society of Fire Safety Engineers Ltd.Warrington Fire Research Centre British Property Federation Amendments issued since publica
10、tion Amd. No.Date of issueComments 7028May 1992Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:43:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7346-2:1990 BSI 04-1999i Contents Page Committees responsible Inside front
11、 cover Forewordii 1Scope1 2Definitions1 3Class of performance1 4Scaling1 5Construction2 6Test conditions2 7Apparatus2 8Test procedure2 9Performance criteria4 10Test report and classification of test piece5 Figure 1 Heating conditions3 Figure 2 Apparatus3 Table 1 Classes of performance1 Publications
12、referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:43:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7346-2:1990 ii BSI 04-1999 Foreword This Part of BS 7346 has been prepared under the direction of the Fire Standards Policy Commit
13、tee, and is based on a draft prepared by the Smoke Ventilation Association. It is one of a series of specifications for components of smoke and heat control systems. The other Parts are as follows: Part 1: Specification for natural smoke and heat exhaust ventilators; Part 3: Specification for smoke
14、curtains. The objective of determining the high temperature performance of a powered smoke and heat exhaust ventilator is to ensure, as far as possible by simulation, that the unit will operate for the temperature and time specified. This British Standard defines the classification of powered smoke
15、and heat exhaust ventilators in terms of proven endurance at elevated temperatures. It also describes the methods of test to be used to measure the performance of powered smoke and heat exhaust ventilators and sets the criteria for structural performance, electrical performance and aerodynamic perfo
16、rmance at high temperatures upon which the classification is based. The standardized temperature and time conditions used in the classification are representative of a limited range of fire conditions only, and the standard does not quantify the behaviour of a ventilator, for a precise period of tim
17、e, in a real fire. A sample ventilator test piece whose normal ambient aerodynamic performance has already been determined in accordance with BS 848-1 is exposed to a specified heating regime and its performance is monitored on the basis of the criteria described in this British Standard. Fire resis
18、tance of the test piece is expressed as the time for which the appropriate criteria have been satisfied, related to the temperature to which the test piece has been subjected. The temperature/time ratings so obtained are a measure of the adequacy of the ventilator performance under different fire co
19、nditions, but have no direct relationship with the duration of a real fire. The test data can be used directly to show compliance with specified fire resistance requirements. The tests can also be used to study the behaviour of ventilators at high temperatures and obtain guidance on the effect of de
20、sign features on performance under fire conditions. This British Standard sets out the means by which the performance of a range of sizes of a particular design may be classified, based on the tested and proven performance of a single representative test piece from the range. The award of a classifi
21、cation to a defined range of sizes of a particular design means that a representative test piece, as defined in clause 8, when tested in accordance with this standard, satisfied the criteria set out in clause 9. Assessed capability. Users of this British Standard are advised to consider the desirabi
22、lity of assessment and registration of a suppliers quality systems against the appropriate part of BS 5750 by a third party certification body. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct appl
23、ication. 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, pages i and ii, pages 1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright dat
24、e) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:43:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7346-2:1990 BSI 04-19991 1 Scope This Bri
25、tish Standard describes the classification and methods of test for powered ventilators designed to remove heat and smoke from buildings in the event of fire. This British Standard is primarily concerned with the duration of ventilator performance at elevated temperatures. For aspects of aerodynamic
26、and acoustic performance reference is made to existing standards where appropriate. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this standard the following definitions apply. 2.1 automatic powered smoke and he
27、at exhaust ventilator a powered ventilator that is installed into a building and is designed to open automatically after the outbreak of fire if called upon to do so, to allow smoke and hot gases to be extracted 2.2 dual purpose powered smoke and heat exhaust ventilator a powered smoke and heat exha
28、ust ventilator which has provision to allow its use for comfort ventilation 2.3 exit terminal the device fitted to the building envelope which directs the flow of hot gases away from the building in the event of fire and which prevents the ingress of wind, rain, snow and hail under non-fire conditio
29、ns 2.4 rated temperature the furnace temperature at which the test piece is operated for the duration of the test 2.5 rated duration the time for which the test piece is operated at the maintained rated temperature 3 Class of performance The classes of performance shall be as given in Table 1. Table
30、 1 Classes of performance 4 Scaling 4.1 The performance of a range of sizes of a particular design may be classified, based on the tested and proven performance of a single or small number of representative test pieces from the range, in accordance with 4.2, 4.3 and 4.4 as follows. 4.2 The individua
31、l units within the range to be classified shall be physically similar, using the same form of construction and materials throughout. For units to be physically similar, the method of impeller construction, the motor construction and specification, the type and class of fit of the motor bearings, the
32、 mounting arrangements and electrical connection methods shall not vary across the range. NOTEThe following may vary across the range: a) overall dimensions of the units; b) the diameter, blade length and number of blades of the impeller; c) the size of motor. 4.3 The range of sizes which can be cla
33、ssified from one successfully tested unit shall be defined by the following criteria: 0.4D 0.9 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:43:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7346-2:1990 BSI 04-19995 9.4.3 Ventilators designed for roof or
34、wall mounting shall be constructed so that, when in use, the flames or hot gases emerging from the ventilator will not be directed onto the roof or adjacent structure. 10 Test report and classification of test piece The test report shall include the following information: a) the name of the testing
35、laboratory (see 6.1); b) the name of the sponsor; c) the date of the test; d) a description of the test piece, including parts list and reference to drawing numbers which shall show the name of the manufacturer, catalogue reference and serial number of the test piece, and any modifications made in o
36、rder to facilitate the test; e) the rated duration of the test (see 6.3); f) the rated temperature of the test (see 6.3); g) the time taken for the first phase of the heating period; h) the time taken for the second phase of the test, i.e. the rated duration for the test or the time to failure if th
37、is is less than the “rated time”; i) a record of observations regarding the condition of the test piece upon inspection both before and after the heating period; j) the performance of the test piece classified in accordance with clause 3 and the classification achieved. Licensed Copy: London South B
38、ank University, London South Bank University, Fri Dec 08 10:43:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 6 blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:43:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7346-2:1990 BSI 04-1999 Publications refer
39、red to BS 476, Fire tests on building materials and structures. BS 476-7, Method for classification of the surface spread of flame of products. BS 848, Fans for general purposes. BS 848-1, Methods of testing performance. BS 848-8, Fan terminology and classification1). BS 5750, Quality systems. BS 64
40、60, Accreditation of testing laboratories. BS 6460-1, Specification of the general requirements for the technical competence of testing laboratories. 1) In preparation. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:43:42 GMT+00:00 2006, Uncontrolled Copy, (
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