1、BS 8489-6:2016Fixed fire protectionsystems Industrial andcommercial watermistsystemsPart 6: Fire performance tests andrequirements for watermist systemsfor the protection of industrial oilcookersBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Publishing and copyright
2、 informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. The British Standards Institution 2016Published by BSI Standards Limited 2016ISBN 978 0 580 85531 3ICS 13.220.20The following BSI references relate to the work on this document:Committee refer
3、ence FSH/18/5Draft for comment 14/30295820 DCPublication historyFirst published as DD 8489-6, February 2011First published as BS 8489-6, May 2016Amendments issued since publicationDate Text affectedBS 8489-6:2016 BRITISH STANDARDContentsForeword ii0 Introduction 11 Scope 12 Normative references 23 T
4、erms and definitions 34 Apparatus 35 Test conditions 76 Principle 87 Procedure 88 Pass/fail criteria 11AnnexesAnnex A (informative) Commonly used cooking oils 12Bibliography 13List of figuresFigure 1 Diagrammatic arrangement of watermist fire protection for industrialoil cookers 2Figure 2 Configurat
5、ion of test rig A 4Figure 3 Configuration of test rig B 5Figure 4 Configuration of test rig C 6Figure 5 Hood positions 9List of tablesTable A.1 Commonly used cooking oils 12Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 14, an inside back cover
6、 and a back cover.BRITISH STANDARD BS 8489-6:2016 The British Standards Institution 2016 iForewordPublishing informationThis part of BS 8489 is published by BSI Standards Limited, under licence fromThe British Standards Institution, and came into effect on 31 May 2016. It wasprepared by Subcommittee
7、 FSH/18/5, Watermist systems, under the authority ofTechnical Committee FSH/18, Fixed fire fighting systems. A list of organizationsrepresented on these committees can be obtained on request to their secretary.SupersessionThis part of BS 8489 supersedes DD 8489-6:2011, which is withdrawn.Relationshi
8、p with other publicationsBS 8489 is published in a series of parts: Part 1: Code of practice for design and installation; Part 4: Tests and requirements for watermist systems for local applicationsinvolving flammable liquid fires; Part 5: Tests and requirements for watermist systems for the protecti
9、on ofcombustion turbines and machinery spaces with volumes up to andincluding 80 m3; Part 6: Tests and requirements for watermist systems for the protection ofindustrial oil cookers; Part 7: Tests and requirements for watermist systems for the protection oflow hazard occupancies.BS 8489-6 is intende
10、d to be read in conjunction with BS 8489-1.Information about this documentThis document converts DD 8489-6 into a full British Standard.Third-party testing/certification. Users of this British Standard are advised toconsider the desirability of third-party testing/certification of conformity withthi
11、s British Standard.Use of this documentThis British Standard is intended for use by manufacturers, designers andinstallers of watermist systems, and for authorities having jurisdiction.It has been assumed in the preparation of this British Standard that theexecution of its provisions will be entrust
12、ed to appropriately qualified andexperienced people, for whose use it has been produced.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type.Its methods are expressed as a set of instructions, a description, or in sentencesin which the principal auxili
13、ary verb is “shall”. Its requirements are expressed insentences in which the principal auxiliary verb is “shall”.Commentary, explanation and general informative material is presented insmaller italic type, and does not constitute a normative element.Where words have alternative spellings, the prefer
14、red spelling of the ShorterOxford English Dictionary is used (e.g. “organization” rather than“organisation”).BRITISH STANDARDBS 8489-6:2016ii The British Standards Institution 2016Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontra
15、ct. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARD BS 8489-6:2016 The British Standards Institution 2016 iiiBRITISH STANDARDBS 8489-6:2016This page deliberately left blankiv The British Standards Inst
16、itution 20160 IntroductionIndustrial oil cookers are typically non-insulated conveyorized fryers, oroccasional batch kettles, used in food processing plants for chicken, fish, potatoproducts (e.g. fries/chips), doughnuts and many other food products. Thesecookers are extremely different in size, con
17、figuration and construction fromstandard kitchen or restaurant oil cookers or fryers, and require a different typeof extinguishment system.Industrial oil cookers normally have large cooking surfaces; from 4.6 squaremetres to several hundred square metres. They contain from a few hundredlitres up to
18、approximately 18 900 litres of cooking oil. Industrial oil cookers(except for some batch kettles) typically have moveable covers, or hoods, thatcan be hydraulically operated. The hood is generally in a closed position in anormal operation period; however, the hood might be open from time to timeas p
19、art of a routine maintenance. There are also exhaust stacks connected ontop of the hood.The most severe fire incident involving industrial oil cookers is a fire caused byoverheating the cooking oil until it reaches its auto-ignition temperature (AIT).Even though installing an interlocking system to
20、prevent the oil from reachingits AIT is a normal practice in the industry, an AIT fire can happen as a result ofa system malfunction or simple human error. Thus, all the performance testsproposed in this part of BS 8489 require extinguishment of an AIT fire. The AITfire is particularly challenging b
21、ecause of its rapid spread of flame over the oilsurface and its difficulty in extinguishment, as it requires flame extinction overthe entire surface with simultaneous rapid cooling to prevent re-ignition.Exhaust air fans need to be interlocked to shut down automatically upon firedetection or operati
22、on of the watermist system.Whilst this fire test protocol specifically relates to the oil cooker itself, theoverall oil cooker watermist fire protection system is also expected to provideprotection of the adjacent conveyors, fines boxes and exhaust air duct(see Figure 1).1 ScopeThis part of BS 8489
23、describes tests and specifies requirements for industrial andcommercial watermist systems for the protection of industrial oil cookers.This part of BS 8489 does not cover external conveyors, fines boxes, oil transferequipment or supplementary exhaust duct protection.The tests and requirements given
24、in this part of BS 8489 apply only to thespecific fire scenarios described, i.e. with no obstructions between the watermistnozzles and the oil surface when the hood is in either the raised or loweredposition. Configurations with obstructions are not covered in this partof BS 8489.This part of BS 848
25、9 is applicable to the protection of the industrial oil cookersonly, and does not include the protection of other equipment such as exhaustducts, heaters, heat exchangers and food processing areas.BRITISH STANDARD BS 8489-6:2016 The British Standards Institution 2016 1Figure 1 Diagrammatic arrangeme
26、nt of watermist fire protection for industrial oil cookersKey1 Stack2 Hood3 Conveyor4 Oil bath5 Fines box2 Normative referencesThe following documents, in whole or in part, are normatively referenced in thisdocument and are indispensable for its application. For dated references, onlythe edition cit
27、ed applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.BS 8489-1, Fixed fire protection systems Industrial and commercial watermistsystems Part 1: Code of practice for design and installationBS EN ISO/IEC 17025:2005, General requirements f
28、or the competence of testingand calibration laboratoriesBRITISH STANDARDBS 8489-6:20162 The British Standards Institution 20163 Terms and definitionsFor the purposes of this part of BS 8489, the terms and definitions given inBS 8489-1 apply.4 ApparatusNOTE Unless otherwise stated, the following tole
29、rances apply: length: 2%; volume: 5%; pressure: 3%; temperature: 5%.4.1 Test hall of appropriate size to accommodate the largest test rig (4.4), withnatural or minimal ventilation that will not interfere with the fire testing withinthe enclosure or test rig.NOTE Since exhaust air fans are required t
30、o be interlocked with the detectionsystem to shut down the ventilation, and given the expectation that a watermistsystem might not prevent a fire from entering the exhaust duct if the fans remainon, power ventilated exhaust tests are not conducted as part of this part of BS 8489.4.2 Industrial oil c
31、ooker test rig A, fabricated from nominal 11 mm thick steeland comprising a pan and a hood, conforming to Figure 2. The insidedimensions of the pan shall be X mm wide Y mm long 345 mm deep,where X and Y are specified by the watermist system manufacturer, and Y X.The inside dimensions of the hood sha
32、ll be (X + 50) mm wide (Y + 50) mmlong 760 mm deep. Both ends of the hood shall be open. There shall bea 510 mm diameter vent on top of the hood simulating the exhaust duct.The distance from the centreline of the vent to either end of the hood shall be(Y/2 + 25.4) mm. Legs shall be attached along th
33、e length of the hood so that thehood position can be adjusted vertically before each test. Thermocouples (4.6)shall be placed inside the pan as shown in Figure 2. Several evenly spaced gasburners (see Note) shall be placed under the pan, to heat the oil to itsauto-ignition temperature.NOTE The numbe
34、r of gas burners is immaterial, provided that they are evenlyspaced and that the oil reaches auto-ignition temperature.4.3 Industrial oil cooker test rig B, fabricated from nominal 11 mm thick steeland comprising a pan and a hood, conforming to Figure 3. The insidedimensions of the pan shall be X mm
35、 wide 2Y mm long 345 mm deep,where X and Y are specified by the watermist system manufacturer, and Y X.The inside dimensions of the hood shall be (X + 50) mm wide (2Y + 50) mmlong 760 mm deep. Both ends of the hood shall be open. There shall betwo 510 mm diameter vents on top of the hood simulating
36、the exhaust ducts.The distance from the centreline of the vents to the closest respective end of thehood shall be (0.7Y + 20) mm. Legs shall be attached, and gas burners supplied,as specified in 4.2. Thermocouples (4.6) shall be placed inside the pan as shownin Figure 3.4.4 Industrial oil cooker tes
37、t rig C, fabricated from nominal 11 mm thick steeland comprising a pan and a hood, conforming to Figure 4. The insidedimensions of the pan shall be X mm wide 3Y mm long 345 mm deep,where X and Y are specified by the watermist system manufacturer, and Y X.The inside dimensions of the hood shall be (X
38、 + 50) mm wide, (3Y + 50) mmlong and 760 mm deep. Both ends of the hood shall be open. There shall bethree 510 mm diameter holes on top of the hood simulating the exhaust ducts.The distance between the centreline of the vents shall be (0.75Y + 12.5) mm,BRITISH STANDARD BS 8489-6:2016 The British Sta
39、ndards Institution 2016 3and the distance from the centreline of the two vents closest to the ends of thehood shall be (0.75Y + 12.5) mm to the closest respective end of the hood. Legsshall be attached, and gas burners supplied, as specified in 4.2. Thermocouples(4.6) shall be placed inside the pan
40、as shown in Figure 3.Figure 2 Configuration of test rig AAll dimensions are in millimetres and are inside dimensions. Drawing is not to scale.Key1 Hood2 Vent, 510 mm diameter3 Pan4 Distance between thermocouples, 610 mm (typical)5 ThermocouplesX Dimensions as specified by the manufacturer (see 4.2)Y
41、 Dimensions as specified by the manufacturer (see 4.2)BRITISH STANDARDBS 8489-6:20164 The British Standards Institution 2016Figure 3 Configuration of test rig BAll dimensions are in millimetres and are inside dimensions. Drawing is not to scale.Key1 Hood2 Vent, 510 mm diameter3 Pan4 Distance between
42、 thermocouples, 610 mm (typical)5 ThermocouplesX Dimensions as specified by the manufacturer (see 4.3)Y Dimensions as specified by the manufacturer (see 4.3)BRITISH STANDARD BS 8489-6:2016 The British Standards Institution 2016 5Figure 4 Configuration of test rig CAll dimensions are in millimetres a
43、nd are inside dimensions. Drawing is not to scale.Key1 Hood2 Vent, 510 mm diameter3 Pan4 Distance between thermocouples, 610 mm (typical)5 ThermocouplesX Dimensions as specified by the manufacturer (see 4.4)Y Dimensions as specified by the manufacturer (see 4.4)BRITISH STANDARDBS 8489-6:20166 The Br
44、itish Standards Institution 20164.5 Cooking oil, as specified by the manufacturer, based on the manufacturersintended application for protection.NOTE Commonly used cooking oils are listed in Annex A.4.6 Thermocouples, placed inside the pan to measure oil temperatures. One rowof thermocouples shall b
45、e located 50 mm above the bottom of the industrial oilcooker test rig, and a second row shall be located 100 mm above the bottom ofthe test rig. The thermocouples shall be placed along the centreline of the testrig at 610 mm intervals, starting 610 mm from the end of the test rig.4.7 Instrumentation
46、, to measure and record the following parameters, asappropriate to the type of test:a) temperature of fuel in pools;b) test enclosure temperatures;c) pool fire flame temperatures;d) extinguishing agent flow and pressure in the extinguishing system;e) water supply pressure (including tank pressure if
47、 applicable) and nozzledischarge pressures;f) extinguishing agent pressure at the most remote nozzle branch line;g) gas pressure at its storage outlet and distribution sources;h) consumption of foam concentrate or other additive, recorded by means of aload cell on which the concentrate/additive tank
48、 is placed during the tests;i) gas consumption, measured by means of pressure or load cell on which thegas tank is placed during the tests, or mass flow measurement.4.8 Additional baffles or obstructions, if needed, to prevent the direct impact ofmist on the fire.4.9 Stopwatch.5 Test conditions5.1 T
49、he minimum operating nozzle pressure (as specified by the manufacturer)shall be used for all tests. System operating pressures shall be maintained towithin 5%. For decaying pressure systems, the starting pressure shall bewithin 5% of the manufacturers designated starting pressure. For systemsdesigned to cycle between two pressure limits, both the higher and lowerpressures shall be within 5% of the manufacturers designated pressures, andthe periods pertaining to the higher and lower pressure in
