1、BRITISH STANDARD BS 5514-6: 1992 ISO 3046-6: 1990 (corrected edition) Reciprocating internal combustion engines: Performance Part 6: Specification for overspeed protectionBS5514-6:1992 This British Standard, having been prepared under the direction of the Machinery and Components Standards Policy Co
2、mmittee, was published under the authority of the Standards Board and comes into effect on 15 September1992 BSI 02-1999 First published December 1980 Second edition February 1983 Third edition December 1990 Fourth edition September 1992 The following BSI references relate to the work on this standar
3、d: Committee reference MCE/14 Draft for comment 89/73376 DC ISBN 0 580 21127 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Machinery and Components Standards Policy Committee (MCE/-) to Technical Committee MCE/14, upon which the foll
4、owing bodies were represented: Association of Consulting Engineers British Railways Board Ministry of Defence Society of Motor Manufacturers and Traders Ltd. The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Association of British Generatin
5、g Set Manufacturers Marine Engine and Equipment Manufacturers Association Amendments issued since publication Amd. No. Date CommentsBS5514-6:1992 BSI 02-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Normative reference 1 3 Other regulations and requi
6、rements 1 4 Definitions 1 5 General requirements 2 6 Overspeed protection features 2 Annex A (informative) Bibliography 3 Figure 1 Typical speed curve illustrating engine overspeed limiting device response 2 List of references Inside back coverBS5514-6:1992 ii BSI 02-1999 National foreword This Part
7、 of BS5514 has been prepared under the direction of the Machinery and Components Standards Policy Committee, and is identical with ISO3046-6:1990 (corrected edition) Reciprocating internal combustion engines Performance Part 6: Overspeed protection, published by the International Organization for St
8、andardization (ISO). This corrected edition of ISO3046-6 was published in1991, but retained the ISO reference date of1990. This edition of the standard corrects and supersedes BS5514-6:1990 which is withdrawn. BS5514 covers the performance of reciprocating internal combustion engines. The series com
9、prises: Part 1: Specification for standard reference conditions and declarations of power, fuel consumption and lubricating oil consumption; Part 2: Test methods; Part 3: Test measurements; Part 4: Speed governing; Part 5: Torsional vibrations; Part 6: Specification for overspeed protection; Part 7:
10、 Specification for codes for engine power. Parts1 to6 supersede BS649, BS765, BS2953 and BS3109, which were withdrawn in1979. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Complianc
11、e with a British Standard does not of itself confer immunity from legal obligations. Cross-reference International standard Corresponding British Standard ISO 3046/4-1978 BS5514 Reciprocating internal combustion engines: performance Part 4:1979 Speed governing (Identical) Summary of pages This docum
12、ent comprises a front cover, an inside front cover, pages i andii, pages 1 to 4, an 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.BS5514-6:1992 B
13、SI 02-1999 1 1 Scope This part of ISO3046 specifies general requirements and gives definitions for overspeed limiting devices used for the protection of reciprocating internal combustion engines and their driven machinery. It applies to reciprocating internal combustion engines for land, rail tracti
14、on and marine use, excluding engines used to propel road construction and earth-moving machines, agricultural and industrial types of tractors, road vehicles and aircraft. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of
15、 this part of ISO3046. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this part of ISO3046 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Member
16、s of IEC and ISO maintain registers of currently valid International Standards. ISO 3046-4:1978, Reciprocating internal combustion engines Performance Part 4: Speed governing. 3 Other regulations and requirements 3.1 For engines used on board ships and offshore installations which have to comply wit
17、h rules of a classification society, the additional requirements of the classification society shall be observed. The classification society shall be stated by the customer prior to placing the order. For non-classed engines, such additional requirements are in each case subject to agreement between
18、 the manufacturer and customer. 3.2 If special requirements from regulations of any other authority, for example inspecting and/or legislative authorities, have to be met, the authority shall be stated by the customer prior to placing the order. Any further additional requirements shall be subject t
19、o agreement between the manufacturer and customer. 4 Definitions For the purposes of this part of ISO3046, the following definitions apply. Definitions relating to typical engine speeds are given inISO3046-4. 4.1 overspeed limiting device combination of speed sensing and actuating elements which con
20、trol the fuel supply and/or the intake of air and/or the ignition system to the engine when a predetermined speed is exceeded 4.2 setting speed of overspeed limiting device, n ds speed at which the activation of the overspeed limiting device is initiated (seeFigure 1) 4.3 overspeed setting ratio, d
21、ds difference between the setting speed of the overspeed limiting device and the declared speed divided by the declared speed, expressed as a percentage. It is given by 4.4 operating speed of overspeed limiting device, n do speed at which, for a given setting speed, the overspeed limiting device sta
22、rts to operate NOTE 1For a given engine the operating speed is dependent on the total inertia of the RIC engine, the driven machinery and the design of the overspeed limiting device, etc. 4.5 maximum permissible speed, n max maximum speed specified by the engine or set (engine and driven machinery)
23、manufacturer which lies a safe amount below the speed limit (seenote2 andFigure 1) NOTE 2The speed limit, n limis the maximum calculated speed which can be endured by the engine and its driven machinery without risk of damage. 4.6 declared speed, n r engine speed at declared power 4.7 adjustment ran
24、ge range in which the setting speed of overspeed limiting device can be adjusted 4.8 response time, t r time between reaching and exceeding the setting speed(4.2) and reaching the operating speed(4.4) of the overspeed limiting device d ds n ds n r n r - 100 =BS5514-6:1992 2 BSI 02-1999 5 General req
25、uirements 5.1 Engines and their driven machinery have a speed limit (seeFigure 1) which cannot be exceeded without the risk of damage. 5.2 The use of an overspeed limiting device, and any special requirements for it (seenotes3 and4) shall be determined by the application and/or by agreement between
26、the manufacturer and the customer, and/or by inspecting and/or legislative authorities, and/or by classification societies specified by the customer (seealso note1). 5.3 The manufacturer of the set (engine and driven machinery) shall be responsible for ensuring that the setting speed of the overspee
27、d limiting device is satisfactory with respect to the maximum permissible speed(4.5). The setting speed of the overspeed limiting device (seeFigure 1) shall be specified according to the overspeed limiting device used and its response time, ensuring that all parts of the engine and its driven machin
28、ery are protected from damage due to overspeed. 5.4 The overspeed limiting device shall function at all levels of power of the engine. 5.5 The engine manufacturer shall specify the method and frequency of checking the function of the overspeed limiting device. 6 Overspeed protection features 6.1 The
29、 overspeed limiting device shall not affect in any way the normal operation of the engine control systems. However, upon reaching an overspeed condition, the overspeed limiting device shall override the relevant engine control systems to correct the overspeed condition or to stop the engine. NOTE 3M
30、anufacturer and customer may agree whether a failure of the control system shall or shall not affect the operation of the overspeed limiting device. NOTE 4Manufacturer and customer may agree whether damage or a fault in the overspeed limiting device shall or shall not cause the engine to shut down o
31、r indicate activation of the overspeed limiting device by alarm or other means. 6.2 An overspeed shutdown condition shall cause the overspeed limiting device to latch in the shutdown position. Normally, restarting the engine requires manual reset of the latching mechanism. However, automatic reset m
32、ay be permitted in special applications. Figure 1 Typical speed curve illustrating engine overspeed limiting device responseBS5514-6:1992 BSI 02-1999 3 Annex A (informative) Bibliography 1 ISO 2710:1978, Reciprocating internal combustion engines Vocabulary. 2 ISO 8528-2:1992, Reciprocating internal
33、combustion engine driven alternating current generating sets Part 2: Engines 1) . 1) To be published.4 blankBS5514-6:1992 BSI 02-1999 List of references See national foreword.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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