BS 5991-2006 Specification for indirect gas fired forced convection air heaters with rated heat inputs greater than 330 kW but not exceeding 2 MW for industrial and commercial spac.pdf

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1、BS 5991:2006Specification for indirect gas fired forced convection air heaters with rated heat inputs greater than 330 kW but not exceeding 2 MW for industrial and commercial space heating Safety and performance requirements (excluding electrical requirements) (2nd family gases)ICS 97.100.20NO COPYI

2、NG WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2006ISBN 0 580 48078 XThe following BSI references relate to the work on this standar

3、d:Committee reference GSE/20/4Publication historyFirst published, June 1983Second edition, February 1990Third edition, July 2006Amendments issued since publicationAmd. no. Date Text affectedBS 5991:2006 BSI 2006 iBS 5991:2006ContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions

4、 34 Classification of appliances 55 General requirements 56 General conditions of test 67 Design and construction 78 Soundness 149 Heat input 1410 Combustion 1511 Ignition 1512 Flame stability 1813 Flue system 1914 External temperatures 2115 Heat exchanger: working life 2216 Manual gas valves 2217 A

5、utomatic controls 2318 Motors and fans 3619 Electricity supply 3720 Manufacturers instructions 3821 Facilities for commissioning and testing 3922 Identification and marking 4023 Air handling 4224 Combustion chamber pressure reliefs 4225 Thermal efficiency 4226 Air delivery volume 4527 Weather resist

6、ance 48Bibliography 51List of figuresFigure 1 Paint scratch test apparatus 12Figure 2 Test duct for air flow measurement 46Figure 3 Anti-swirl device 46Figure 4 Air flow regulation device 47Figure 5 Connecting bend 47Figure 6 Arrangement of spray heads and associated piping for rain test 49Figure 7

7、Details of spray head assembly and construction 50List of tablesTable 1 Test gas conditions 16Table 2 Heat input conditions 18Table 3 Surface temperature rise 22Table 4 Valves required for natural draught systems 24Table 5 Main gas safety shut-off valve system requirements 24Table 6 Purge test gas 2

8、7Table 7 Flame supervision device drop-out times 30Table 8 Fan motor windings: permissible temperature rises 37Table 9 Enthalpy data for combustion products 44Table 10 Combustion data for test gas G20 44Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pag

9、es 1 to 51 and a back cover.ii BSI 2006BS 5991:2006ForewordPublishing informationThis British Standard was published by BSI and came into effect on 20 July 2006. It was prepared by Subcommittee GSE/20/4, Air heaters (gas), under the authority of Technical Committee GSE/20, Non-domestic space heaters

10、 (gas). A list of organizations represented on this committee can be obtained on request to its secretary.SupersessionThis British Standard supersedes BS 5991:1989, which is withdrawn.Relationship with other publicationsRequirements for appliances with rated heat inputs up to 300 kW based on the net

11、 calorific value are given in BS EN 621:1998 and BS EN 1020:1998 as appropriate.Corresponding requirements for direct gas fired forced convection air heaters are specified in BS 5990.Electrical requirements, applicable for both direct and indirect gas fired forced convection air heaters, are specifi

12、ed in BS 5986.Information about this documentThis new edition of BS 5991 incorporates changes made necessary by the publication of BS EN 621:1998 and BS EN 1020:1998. It does not represent a full review or revision of the standard, which will be undertaken in due course.This edition has been prepare

13、d in order to fulfil the obligation to withdraw conflicting national standards. As a consequence, it no longer applies to appliances with rated heat inputs up to 330 kW based on the gross calorific value (300 kW based on the net calorific value).In anticipation of this standard being the subject of

14、third party certification schemes, it provides for a claim by the appliance manufacturer of a numerical value for the thermal efficiency of a product model. The test authority will then ascertain that a sample submitted for type approval meets this claimed value within a specified test equipment tol

15、erance. Any sample selected from subsequent production of the particular model will be expected to conform to a verification value that will also take into account a specified production tolerance.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. I

16、ts requirements are expressed in sentences in which the principal auxiliary verb is “shall”.Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element.Contractual and legal considerationsThis publication does not purport

17、to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. BSI 2006 1BS 5991:20061 ScopeThis British Standard specifies detailed requirements, including safety and performa

18、nce requirements and methods of test, for indirect gas fired forced convection air heaters having heat inputs greater than 330 kW but not exceeding 2 MW, intended for industrial and commercial applications. Appliances covered by this standard are not intended for installation in domestic dwellings.T

19、he scope of this standard includes indirect gas fired forced convection air heaters for use both with and without ducting, and intended primarily for space heating applications.This standard also specifies the requirements for indirect gas fired forced convection air heaters designed for permanent o

20、utdoor installation.It applies to appliances designed to operate on normal low pressure district supplies of 2nd family gas.For appliances fitted with gas boosters and/or flue dampers, additional requirements may apply.This standard does not apply to portable and transportable indirect gas fired for

21、ced convection air heaters.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.B

22、S 10, Specification for flanges and bolting for pipes, valves and fittingsBS 476-4, Fire test on building materials and structures Part 4: Non-combustibility test for materialsBS 476-7, Fire test on building materials and structures Part 7: Method for classification of the surface spread of flame of

23、 productsBS 476-12, Fire test on building materials and structures Part 12: Methods of test for ignitability of products by direct flame impingementBS 1041 (all parts), Code for temperature measurementBS 1042-2.1 (ISO 3966), Measurement of fluid flow in closed conduits Part 2.1: Method using Pitot s

24、tatic tubesBS 1179-6, Glossary of terms used in the gas industry Part 6: Combustion and utilization including installation at consumers premisesBS 5000-11, Specification for rotating electrical machines of particular types or for particular applications Part 11: Small power electric motors and gener

25、atorsBS 5986, Specification for electrical safety and performance of gas fired space heating appliances with inputs 60 kW to 2MWBS 5991:20062 BSI 2006BS EN 88, Pressure governors for gas appliances for inlet pressures up to 200 mbarBS EN 125, Specification for flame supervision devices for gas burni

26、ng appliances Thermoelectric typesBS EN 126, Multifunctional controls for gas burning appliancesBS EN 161, Automatic shut-off valves for gas burners and gas burning appliancesBS EN 257, Mechanical thermostats for gas burning appliancesBS EN 298, Automatic gas burner control systems for gas burners a

27、nd gas burning appliances with or without fansBS EN 437, Specification for test gases, test pressures and categories of appliance, for gas appliancesBS EN 621:1998, Non-domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW, without a fan to assis

28、t transportation of combustion air and/or combustion productsBS EN 1020:1998, Non-domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW, incorporating a fan to assist transportation of combustion air and/or combustion productsBS EN 1092-3, Flange

29、s and their joints Circular flanges for pipes, valves, fittings and accessories, PN designated Part 3: Copper alloy flangesBS EN 10143, Continuously hot dip metal coated steel sheet and strip. Tolerances on dimensions and shapesBS EN 10226-1, Pipe threads where pressure tight joints are made on the

30、threads. Taper external threads and parallel internal threads Part 1: Dimensions, tolerances and designationBS EN 10226-2, Pipe threads where pressure tight joints are made on the threads. Taper external threads and taper internal threads Part 2: Dimensions, tolerances and designationBS EN 12329, Co

31、rrosion protection of metals Electrodeposited coatings of zinc with supplementary treatment on iron or steelBS EN 12540, Corrosion protection of metals Electrodeposited coatings of nickel, nickel plus chromium, copper plus nickel and copper plus nickel plus chromiumBS EN 60730-2-9, Specifications fo

32、r automatic electrical controls for household and similar use Part 2-9: Particular requirements for temperature-sensing controlsBS EN 61032, Protection of persons and equipment by enclosures Probes for verificationBS EN ISO 1461, Hot dip galvanized coatings on fabricated iron and steel articles Spec

33、ifications and test methodsPD CEN/TR 17491), European scheme for the classification of gas appliances according to method of evacuation of the combustion products (types)1)In preparation. BSI 2006 3BS 5991:20063 Terms and definitionsFor the purposes of this British Standard, the following terms and

34、definitions, together with those given in BS 1179-6, BS 6230 and the following apply.3.1 air temperature controltemperature-actuated control intended to maintain the temperature of the discharged air, the return air to the heater, or the air in the heated space between specified limitsNOTE This is t

35、he normal means of air temperature control.3.2 automatic burner systemburner system in which, when starting from the completely shut-down condition, the start-gas flame is established and the main gas valve(s) is actuated without manual interventionNOTE 1 Automatic burners may have pilots that are i

36、nterrupted or intermittent.NOTE 2 This definition differs from that given in BS 1179-6.3.3 automatic recyclingautomatic repetition of the starting-up sequence without manual intervention3.4 burnercombustion system under the control of a single system of safety shut-off valvesNOTE 1 An appliance may

37、have more than one burner and a burner may comprise a number of separate nozzles or bars.NOTE 2 This definition differs from that given in BS 1179-6.3.5 forced convection air heaterappliance designed to provide space heating from a central source by distributing heated air, by means of an air-moving

38、 device, either through ducting or directly into the heated space3.6 hazardous conditioncondition that could result in damage external to the appliance and/or injury to personnel3.7 indirect fired air heaterappliance in which the products of combustion are separately vented and do not mix with the h

39、eated air being supplied to the space3.8 lock-outsafety shut-down condition of a control system such that restart cannot be accomplished without manual interventionBS 5991:20064 BSI 20063.9 minimum operational rate70% of the minimum rate of the control system3.10 multifunctional controlassembly comp

40、rising two or more gas control devices in addition to a gas tap and any gas rate adjuster within a single housing3.11 natural draught burnerburner that does not employ a fan for the entrainment of air, either forced or inducedNOTE 1 The term includes atmospheric injectors and neat gas burnersNOTE 2

41、This definition differs from that given in BS 1179-6.3.12 non-automatic burner systemburner system that is non-automatic within the meaning of 3.2, i.e. a burner with a permanent pilot ignited under manual supervision3.13 overheat (limit) controltemperature-actuated device preset and sealed by the m

42、anufacturer and designed to protect the appliance and its surroundings in the event of failure of the normal means of temperature controlNOTE This definition differs from that given in BS 1179-6.3.14 rated heat inputappliance manufacturers declared heat input for the appropriate reference test gas3.

43、15 safety shut-downaction of shutting off all gas and ignition energy by means of a safety control such that restart takes place only after manual intervention or automatic recycling3.16 setting pressurepressure, measured at the pressure test point, that is specified by the manufacturer for the purp

44、ose of adjusting the appliance heat input3.17 start-gas flameflame established at the start-gas rateNOTE This may be either a pilot flame or the main burner flame at reduced rate.3.18 claimed efficiency (Ec)net efficiency of an appliance claimed by the manufacturer BSI 2006 5BS 5991:20063.19 test ho

45、use efficiency (Et)net efficiency of an appliance measured at the test house on a sample submitted for type approval purposes3.20 verification efficiency (Ev) net efficiency of an appliance measured during any surveillance or check testing of production appliances3.21 heater with integral fan in the

46、 secondary flueappliance incorporating an integral fan downstream of the draught diverter which is used to assist in the evacuation of products of combustion3.22 equivalent resistanceresistance to flow in mbar, measured at the outlet of the appliance, which is equivalent to that of the flue4 Classif

47、ication of appliances4.1 By categoryBS EN 437 describes the category system of appliance classification in which an appliance is denoted by a category number I, II or III according to the number of gas families that it is designed to burn, these families being identified by subscript numbers 1, 2 an

48、d 3 for the 1st, 2nd and 3rd families respectively, and subscript letters identifying specific gas groups.This standard is concerned with appliances of category I2Honly.4.2 By flue typeAppliances are also classified according to the flue system for which they are designed and the source of combustio

49、n air.Type A: flueles appliances.Type B: open-flued appliances.Type C: room-sealed appliances.Type C1:balanced flue appliances.Type C2:se-duct appliancesThis standard covers appliances of type B only.The definitions of the specific variations of type B appliances are as given in PD CEN/TR 1749.5 General requirementsThe appliance shall conform to the requirements of this standard when tested using the test gases specified in BS EN 437 for group H 2nd family gas.BS 5991:20066 BSI 2006Any new features incorporate