BS 799-4-1992 Oil burning equipment - Specification for atomizing burners (other than monobloc type) together with associated equipment for single burner and multi burner installat.pdf

1、BRITISH STANDARD BS 799-4: 1991 Oil burning equipment Part 4: Specification for atomizing burners (other than monobloc type) together with associated equipment for single burner and multi burner installationsBS799-4:1991 This British Standard, having been prepared under the directionof the Refrigera

2、tion, Heating and Air Conditioning Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effecton 31 January 1992 BSI 03-1999 First published as Part 1, May1938 Second edition, February 1953 Third edition, November 1962 Fourth edition as Part 4, December 19

3、72 Fifth edition January 1992 The following BSI references relate to the work on this standard: Committee reference RHE/13 Draft for comment 91/72756 DC ISBN 0 580 19983 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Refrigeration, He

4、ating and Air Conditioning Standards Policy Committee (RHE/-) to Technical Committee RHE/13, upon which the following bodies were represented: Agricultural Engineers Association Associated Offices Technical Committee British Combustion Equipment Manufacturers Association Building Services Research a

5、nd Information Association Chartered Institution of Building Services Engineers Department of the Environment (Building Research Establishment) Department of the Environment (Property Services Agency) Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users Associat

6、ion Institute of Domestic Heating and Environmental Engineers Institute of Energy Institution of Fire Engineers Loss Prevention Council Power Generation Contractors Association (BEAMA Ltd.) Coopted members Amendments issued since publication Amd. No. Date CommentsBS799-4:1991 BSI 03-1999 i Contents

7、Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Burner operating sequences 4 4 Types of oil burner control 4 5 Purging, ignition and flame failure 9 6 Materials and components 11 7 Painting and identification 15 8 Electrical equipment 15 9 Operating instruction

8、s 16 10 Marking 16 Appendix A Recommendations for safety of plant to which oil burners are fitted 17 Appendix B Classification of atomizing oil burners 17 Appendix C Recommendations on the maximum degree of filtration for different classes of fuel 18 Table 1 Burner operating sequence 5 Table 2 Maint

9、enance of single non-mechanical filters: minimum intervals between cleaning 13 Table 3 Minimum storage and outflow temperatures for classes C, D, E, F, G and H oil fuels and ALF 15 Table 4 Recommended maximum degree of filtration for classes C, D, E, F and G oil fuel 18 Table 5 Recommended maximum d

10、egree of filtration for ALF and class H oil fuel 18 Publication(s) referred to 20BS799-4:1991 ii BSI 03-1999 Foreword This Part of BS799 has been prepared under the direction of the Refrigeration, Heating and Air Conditioning Standards Policy Committee. It is a revision of BS799-4:1972 which is with

11、drawn. This Part of BS799 is one of a series of standards on oil burning equipment and deals with atomizing oil burners and associated equipment that are not pre-assembled and therefore not identifiable as being of the monobloc type. It also covers atomizing oil burning systems not of the monobloc t

12、ype which were covered by BS799-3:1981. When information is required relating to the installation or operation of the types of oil burning systems covered by this Part of BS799, reference should be made to BS5410-2 and BS5410-3 as appropriate. In addition, attention is drawn to BS4256-2. Attention i

13、s also drawn to the current work on the subject of oil burning equipment by Technical Committee47 of the European Committee for Standardization (CEN/TC 47). BS799-7 and BS799-8 are identical to European Standards produced by CEN/TC 47 and as further specifications are published, the equivalent Parts

14、 of BS799 will be withdrawn. Appendix A of this Part of BS799 gives recommendations for safety of plant to which oil burners are fitted. Product certification. Users of this British Standard are advised to consider the desirability of third party certification of product conformity with this British

15、 Standard based on testing and continuing surveillance, which may be coupled with assessment of a suppliers quality systems against the appropriate Part of BS5750. Enquiries as to the availability of third party certification schemes will be forwarded by BSI to the Association of Certification Bodie

16、s. If a third party certification scheme does not already exist, users should consider approaching an appropriate body from the list of Association members. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their

17、 correct application. 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, pages1 to 20, an inside back cover and a back cover. This standard has been updated (see

18、copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS799-4:1991 BSI 03-1999 1 1 Scope This Part of BS799 specifies oil burning installations for land and marine purposes. The installations may comprise single or multiple a

19、rrangement of atomizing type burners and associated equipment that is not assembled on the same frame or in the same housing. The installations are for use with liquid fuels as specified in BS2869 or Alternative Liquid Fuels (ALF) having essentially similar characteristics. Reference to oil burners,

20、 oil heaters, etc.implies use with either liquid fuel. This standard does not apply to gas turbines and internal combustion engines. NOTE 1Where the oil burning installation is part of a plant that is required to be certified under the Health and Safety at Work etc.Act1974 or any other legislation,

21、reference should be made to such legislation. Attention should also be given to SI2169, 1989, The Pressure Systems and the Transportable Gas Containers Regulations1989, as parts of these are pertinent to certain aspects of large burner installations, especially those with steam oil-preheaters. NOTE

22、2For burners burning fuel at below 30 kg/h, seeBSEN230 with respect to safety times. NOTE 3The titles of the publications referred to in this standard are listed on page 20. 2 Definitions For the purposes of this British Standard the following definitions apply. 2.1 oil petroleum fuel classes C, D,

23、E, F, G and H in accordance with BS 2869, and ALF having essentially similar characteristics NOTEAdvice should be sought when changing from one grade of petroleum oil to another Petroleum fuels and ALF may be found to be incompatible. 2.2 oil burner a means of mixing oil and air in order to promote

24、controlled combustion. This normally consists of a device for delivering the oil in a controlled manner, and a method of introducing combustion air, arranged so that the desired mixing rate is achieved 2.3 atomizing oil burner liquid fuel burners in which ignition of the fuel is preceded by a prepar

25、atory phase during which the fuel is divided into small droplets to facilitate mixing with combustion air NOTEThe main types of burner in this category are defined in2.4 and2.5. 2.4 pressure jet atomizers liquid fuel burners in which oil is supplied, under pressure and at a suitable viscosity, to a

26、nozzle in which some of the pressure is used to impart rotation (swirl) to the oil before it is discharged through the final orifice. On issuing from the final orifice, a film is produced which breaks up into oil droplets NOTEThere are various types of pressure jet atomizers and these are classified

27、 inB.2. 2.5 two-fluid atomizers liquid fuel burners in which oil droplets are produced by promoting high rates of shear in the oil by the use of an additional fluid such as air or steam NOTEThere are various types of two-fluid atomizers and these are classified inB.3. 2.6 monobloc type oil burner an

28、 assembly of components including at least the means for the air and the fuel supply and atomization, the flame monitoring, and the adjustment of operation NOTEThe components of the assembly are fixed one to another or assembled on the same frame or in the same housing. These components include at l

29、east a fuel pump, an atomizing device, a combustion air fan, an ignition device, a flame monitoring device and a motor. The assembly is catalogued in this way by the manufacturer. 2.7 regulating device a device which maintains the controlled quantity (for instance, temperature, pressure) at a partic

30、ular determined value 2.8 flame monitor a device which sends signals to the control device indicating that the flame has failed to be established, is present or has been extinguished NOTEGenerally such a device consists of a sensor (possibly associated with an amplifier) and delivers a signal. 2.9 c

31、ontrol device a device which effects starting up and switching off of the oil burner in accordance with a pre-set programme in response to signals from the regulating, monitoring or limiting devices NOTE 1A synonymous term for “control device” is “controller”. NOTE 2Some components of the flame moni

32、tor may be incorporated into the control device (for instance, an amplifier with a relay).BS799-4:1991 2 BSI 03-1999 2.10 limiter a device which senses the controlled quantity, causing the switching off of the burner. It operates once a predetermined limiting value has been reached 2.11 automaticall

33、y reset limiter a limiter which resets itself automatically and allows the restarting of the burner only after a predetermined change of the supervised quantity has occured 2.12 manually reset limiter a limiter which requires simple manual intervention for the restarting of the burner 2.13 reset lim

34、iter with locking device a limiter which can only be reset by use of specialized tools, by trained personnel, to allow the restarting of the burner 2.14 automatic ignition performed electrically a system in which the ignition necessarily involves the sole use of electrical energy NOTEThe two systems

35、 described in2.15 and2.16 may be distinguished. 2.15 proven spark ignition a system which admits no fuel flow unless the presence of the spark is proved 2.16 unproven spark ignition a system in which the admission of the fuel is not prevented by the absence of the spark 2.17 automatic ignition provi

36、ded by liquid or gaseous fuels a system in which the fuel is ignited by a small liquid or gaseous fuel burner known as a pilot burner, and which may be operated continuously or discontinuously NOTEIn the case of discontinuous operation the two systems indicated in2.18 and2.19 may be distinguished. 2

37、.18 ignition by proved pilot burner a system which admits no main fuel flow unless the presence of flame on the pilot burner is proved 2.19 ignition by unproved pilot burner a system in which the admission of the main fuel is not prevented by the absence of a flame on the pilot burner 2.20 operating

38、 shut-down a process initiated by a regulating device, by an automatically reset limiter, by a time-switch or manually 2.21 flame fault shut-down a process initiated by the action of the flame monitor when the flame fails to be ignited or is extinguished, and resulting in a lock-out of the control d

39、evice under the conditions of clauses4 and5 2.22 safety shut-down a lock-out of the control device after a response is received from either a manually reset limiter or a reset limiter with locking device, e.g.for pressure, temperature, water-level, atomizing medium or combustion air 2.23 lock-out st

40、opping of the control device so that restarting cannot be effected without manual intervention 2.24 re-ignition a process in which the ignition is switched on after extinction of the flame during operation, without the oil supply being interrupted 2.25 restart a process in which the starting procedu

41、re is repeated after extinction of the flame during operation. When restarting is carried out, the specified control programme sequence is adhered to NOTE 1A synonymous term for “restart” is “repetition”. NOTE 2See also2.33. 2.26 total ignition time the period during which the ignition device is in

42、operation. Pre-ignition, actual ignition and post-ignition times comprise the total ignition time 2.27 pre-ignition time the period between the starting up of the ignition device and the release of the oil supplyBS799-4:1991 BSI 03-1999 3 2.28 actual ignition time the period between the release of t

43、he oil supply and the first appearance of the flame 2.29 post-ignition time the period between the first appearance of the flame and the switching off of the ignition device 2.30 safety time the maximum permitted period of time during which the control device allows release of the oil when no flame

44、is present NOTEA distinction is made between the safety times, according to whether they are followed by fault shut-downs when starting-up or during operation. 2.31 safety time at ignition the period beginning the instant the signal to release the oil supply is given and finishing with the signal to

45、 shut off the oil supply 2.32 safety time during the state of operation the period beginning at the instant of the disappearance of the flame and finishing with the signal to shut off the oil supply 2.33 waiting time the minimum period between the shutting down of the oil burner after extinction of

46、the flame and restoration of the oil feed which accompanies restarting of the burner 2.34 flame simulation a signal indicating that a flame is present whereas in fact no flame is present NOTEFor protection against the simulation of a flame and against stray light (applicable only in the case of flam

47、e detection systems relating to a continuous level of illumination) see3.1. 2.35 purging time the period during which the combustion chamber is forcibly ventilated without the oil supply being released NOTESee alsoTable 1. 2.36 pre-purging time the period immediately preceding the release of the fue

48、l supply 2.37 post-purging time the period immediately subsequent to the cutting off of the fuel supply 2.38 state of operation the state beginning when the flame is in existence after the permitted safety time necessary for the ignition; at this point the starting-up process ends 2.39 hand control

49、oil burner an oil burner where all the specified burner operating sequences are carried out by an operator NOTE 1See clause3. NOTE 2The safety of a hand control oil burning system is entirely dependent on the time of response of the operator and for this reason it is recommended that a flame-monitored hand control burner system be used in preference to a hand control system. 2.40 flame-monitored hand control a hand control burner that also incorporates flame-monitoring equipment so as to shut off the fuel supply to the burner within the specified time after flame fa