1、BRITISH STANDARD BS 799-2:1991 Oil burning equipment Part 2: Specification for vaporizing burnersBS799-2:1991 This British Standard, having been prepared under the direction of the Refrigeration, Heating and Air Conditioning Standards Policy Committee, was published under the authority of the Standa
2、rds Board and comes into effect on 31 January1992 BSI03-1999 First published October1964 Second edition April1981 Third edition31 January 1992 The following BSI references relate to the work on this standard: Committee reference RHE/13 Draft for comment91/72757 DC ISBN 0 580 19982 7 Committees respo
3、nsible for this British Standard The preparation of this British Standard was entrusted by the Refrigeration, Heating and Air Conditioning Standards Policy Committee (RHE/-) to Technical Committee RHE/13, upon which the following bodies were represented: Agricultural Engineers Association Associated
4、 Offices Technical Committee British Combustion Equipment Manufacturers Association Building Services Research and Information Association Chartered Institution of Building Services Engineers Department of the Environment (Building Research Establishment) Department of the Environment (Property Serv
5、ices Agency) Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users Association Institute of Domestic Heating and Environmental Engineers Institute of Energy Institution of Fire Engineers Loss Prevention Council Power Generation Contractors Association (BEAMA Ltd.
6、) Coopted Members Amendments issued since publication Amd. No. Date CommentsBS799-2:1991 BSI 03-1999 i Contents Page Committees responsible Inside front cover Foreword ii Section 1. General 1.1 Scope 1 1.2 Definitions 1 Section 2. Fully automatic pot-type vaporizing burners 2.1 Fuels for pot burners
7、 2 2.2 Burner system 2 2.3 Oil feed and oil shut-off 2 2.4 Ignition 2 2.5 Air supply 2 2.6 Burner construction 2 2.7 Control 2 2.8 Flame failure 3 2.9 Combustion performance and smoke index 3 2.10 Electrical supply 3 Section 3. Fully automatic rotary-type vaporizing burners 3.1 Fuels for burners 4 3
8、.2 Burner system 4 3.3 Oil feed and oil shut-off 4 3.4 Ignition 4 3.5 Air supply 4 3.6 Burner construction 4 3.7 Control 4 3.8 Flame failure 5 3.9 Combustion performance and smoke index 5 3.10 Electrical supply 5 Section 4. Semi-automatic vaporizing burners 4.1 Fuels for burners 6 4.2 Burner system
9、6 4.3 Oil feed and oil shut-off 6 4.4 Ignition 6 4.5 Air supply 6 4.6 Burner construction 6 4.7 Control 6 4.8 Flame failure 7 4.9 Combustion performance and smoke index 7 4.10 Electrical supply 7 Section 5. Materials and components 5.1 Materials 8 5.2 Oil filters 9 5.3 Electrical equipment 10 5.4 Op
10、erating instructions 10 5.5 Marking 10 Publication(s) referred to Inside back coverBS799-2:1991 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 replaces BS799-2:1981 which is withdrawn.
11、 This edition of BS799-2 contains no technical changes from the1981 edition. It does not reflect a full review, which will be undertaken in due course. The only changes implemented by this edition are: a) the references have been brought up-to-date; b) the clause numbering system has been changed; c
12、) minor editorial changes have been included to bring the standard up to current BSI house style. This Part of BS799 is one of a series of standards on oil burning equipment and deals with types of vaporizing burners suitable for burning oil complying with classes C2 and D of BS2869. It specifies re
13、quirements for the safe and reliable operation of vaporizing burners. The object of this Part of BS799 is to fulfil the need for a British Standard on various types of burners often associated with single family dwellings and not covered by BS799-3 and BS799-4, which deal with atomizing burners. For
14、 oil storage tanks, reference should be made to BS799-5. Where information is required relating to the installation of the types of oil burner covered by this Part of BS799, reference should be made to BS5410-1. Product certification. Users of this British Standard are advised to consider the desira
15、bility of third party certification of product conformity with this British 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
16、 schemes will be forwarded by BSI to the Association of Certification Bodies. 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 pro
17、visions of a contract. Users of British Standards are responsible for their 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, pages1to10, an
18、 inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS799-2:1991 BSI 03-1999 1 Section 1. General 1.1 Scope This Part of BS799 specifies requirements
19、for oil vaporizing burners and associated equipment for boilers, heaters, furnaces, ovens and other similar static flued plant such as free standing space heating appliances for single family dwellings. It is not intended to be applicable to atomizing burners 1)or gas generators used for industrial
20、purposes or to marine and mobile installations. The standard does not apply to the appliances to which the burner is fitted. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 1.2 Definitions for the purposes of this Part of this British Standard the
21、 following definitions apply. 1.2.1 oil petroleum oil fuel of classes C2 and D as specified in BS2869 1.2.2 vaporizing oil burner burner incorporating a vaporizing or gasifying device and including means of regulating the oil and combustion air. The burner may also include filter, pumps and fans. Ig
22、nition equipment control devices, safety devices and oil preheaters may be incorporated with the burner as a unit, according to the type of oil burning equipment 1.2.3 pot burner burner consisting of a metal pot in which the oil is vaporized and in which combustion commences. A vaporizing surface, u
23、sually the base of the pot, is provided and oil is fed to it by gravity from a constant-level device via a metering device. Combustion air usually enters through perforations in the walls of the pot in such a way that it mixes progressively with the oil vapour. Separate air feed pipes or additional
24、air inlets forming an integral part of the burner, such as an annulus at the mouth of the pot, may also be used. Although combustion commences in the pot, the flame normally burns mainly outside the mouth of the pot 1.2.4 rotary burner burner consisting of a centrally mounted motor that provides mea
25、ns of supplying air and oil to the combustion zone formed local to the appliances heating surface. A vaporizing surface is provided upon which the oil strikes when thrown from the central oil distributor. Combustion air usually enters through the base of the motor housing and is drawn up through the
26、 motor by means of a fan on top of the distributor. It is then fed across the hearth plate where it mixes with the vaporized fuel. Normally this mixture then burns on a grill assembly situated above the vaporizing surface. Oil is fed to the burner by means of a constant-level device or oil-control d
27、evice. From the control it is fed to the distributor, which, by its rotating action, throws the oil in a horizontal plane onto the vaporizing surface 1.2.5 perforated sleeve burner burner consisting of one or more narrow vaporizing troughs into which the oil is fed by gravity from a constant-level d
28、evice via a metering device. The sides of each trough are surmounted by perforated metal walls through which the combustion air enters and mixes with the oil vapour. Combustion takes place partially above, but mainly between, the pairs of perforated sleeves. A wick may be fitted in the trough for ki
29、ndling purposes 1.2.6 fully automatic burner burner that automatically performs a sequence of operations including starting and stopping. The oil consumption may be either preset or be automatically variable between predetermined limits fixed by the manufacturer 1.2.7 semi-automatic burner burner th
30、at is started either manually or by manually controlled electric ignition, and is finally shut down by hand. Whilst the burner is alight the oil consumption is automatically varied from high to low or vice versa or to any other flow rate as may be determined by the heat requirements, e.g.boiler wate
31、r temperature 1) See BS799-3 and BS799-4.BS799-2:1991 2 BSI 03-1999 Section 2. Fully automatic pot-type vaporizing burners 2.1 Fuels for pot burners Each vaporizing burner shall be arranged and set to burn one of the following two fuels: a) kerosene, having a maximum viscosity of2mm 2 /s at40C, comp
32、lying with class C2 as specified in BS2869 2) ; b) heating oil, having a maximum viscosity of5.5mm 2 /s at40C, complying with class D as specified in BS2869. When changing from one fuel to the other, the burner shall be modified in accordance with the manufacturers instructions. 2.2 Burner system Fu
33、lly automatic pot burners shall be constructed and controlled so as to operate in such a manner that all the requirements of this Part of BS799 apply in order to give safe and reliable operation in all circumstances. 2.3 Oil feed and oil shut-off 2.3.1 Means shall be provided for ensuring that oil i
34、s supplied to the burner at the correct rate at all times. 2.3.2 The burner shall incorporate devices that will: a) meter the oil supply to the burner within the required limits of flow and be so set and sealed that it shall not have a flow rate in excess of10% above the declared maximum burning rat
35、e; b) shut off the oil supply in all cases where the burner is idle or where flame is not established (see also2.8); c) shut off the oil supply should the devices provided to meet the requirements of2.3.2 b) fail or be inoperative for any reason. The device shall require manual reset. 2.3.3 It shall
36、 not be possible to remove any component in the oil supply line to the burner without the use of a tool. 2.3.4 The integral fuel lines shall be of metal and shall not be loadbearing parts of the construction. Connectors shall be leak-tight. Removable tubing shall be connected by means of metal screw
37、 threads including at least four engaged threads. The sealing of the parts containing fuel shall be such that there is no leakage or seepage. 2.4 Ignition Means shall be provided for automatically igniting the oil. NOTE 1Ignition may be intermittent or continuous during operation. NOTE 2Ignition is
38、intermittent when it is active only for a period associated with the starting cycle, or re-establishment of flame following flame failure. Ignition is continuous when it is active throughout the period during which the burner is alight. 2.5 Air supply 2.5.1 Means shall be provided for ensuring an ad
39、equate supply of air to ensure efficient combustion. 2.5.2 Where an ignitor is energized whilst the burner is idle and where the fuel is normally supplied to the burner by gravity, adequate air shall be available by natural draught to ensure safe combustion of any oil seepage into the burner. Where
40、assisted, forced or induced draught is used, failure of combustion air supply shall not give rise to a dangerous condition. 2.5.3 Manually operated dampers shall not be fitted. Automatically operated dampers, if fitted, shall be interlocked with the fuel supply and arranged so that the burner cannot
41、 operate with a closed flue. 2.5.4 When operating under pilot or low fire conditions, sufficient air shall be available to permit combustion and to achieve compliance with2.9. 2.6 Burner construction The burner shall be constructed in such a manner that the lowest point of oil spillage is not less t
42、han6.5 mm higher than the maximum trip oil level in the constant-level control. 2.7 Control 2.7.1 The burner and control system in combination shall be such that, in the event of failure to ignite when starting, the burner will assume a safe condition (lock-out) and will require manual reset of its
43、sequencing control. In the event of a flame failure occurring when running, the provisions of2.8 shall apply. 2.7.2 A temperature or pressure sensing device shall be provided on the appliance to start and stop the burner; it may also be used to control the rate of firing. In addition, a separately o
44、perating limiting device shall be provided to stop the burner before the pressure or temperature in the boiler, furnace or other appliance exceeds safe limits. 2) 1 mm 2 /s=1cSt.BS799-2:1991 BSI 03-1999 3 2.7.3 Controls and safety devices shall be coupled so that operation of each occurs in the corr
45、ect sequence and timing; coupling may be electrical or mechanical. The controls and safety devices shall: a) ensure that the start-up sequence is not able to commence unless the flame sensing equipment has confirmed the no-flame condition; b) establish satisfactory ignition of the oil; c) maintain n
46、ormal operation if the flame is satisfactorily established, and switch off ignitor, except where continuous means of ignition is employed; d) automatically vary the burner firing rate, where applicable; e) stop the burner in accordance with the control sequence when the demand for heat is satisfied;
47、 f) stop the oil supply and lock-out system if flame is not satisfactorily established during the starting sequence; g) provide means for a visible or audible indication that the unit is in a lock-out condition; h) ensure that any interruption of the electricity supply does not give rise to a danger
48、ous condition (see2.10). 2.7.4 If the control sequences are such that an attempt to re-ignite the burner can be made when it is in a flooded condition (either automatically or after resetting of a lock-out device), the burner shall either: a) ignite and burn in a safe manner whilst the surplus oil i
49、s burnt off and the burner is returning to normal operation conditions; or b) not ignite. 2.8 Flame failure NOTEIn the event of flame failure where the burner employs continuous ignition no timed oil shut-off is required. In the event of flame failure, where the burner employs intermittent ignition, the following shall apply. a) Flame failure: maximum oil shut-off timings. If there is a flame failure, the oil shall be shut off within30 s of flame extinction, except that one automatic attempt to re-ignite the burner may be made without shutting off the oil supply provided
