1、BRITISH STANDARD BS 5226:1991 Code of practice for Equipment and procedures for the cleaning and disinfecting of milking machine installationsBS5226:1991 This British Standard, having been prepared under the directionof the Agriculture and Food Standards Policy Committee,was published underthe autho
2、rity of the Standards Board and comes into effect on 31May1991 BSI 01-2000 First published October 1975 Second edition November 1982 Third edition May 1991 The following BSI references relate to the work on this standard: Committee reference AFC/30 Draft for comment 89/51960 DC ISBN 0 580 19320 9 Co
3、mmittees responsible for this British Standard The preparation of this British Standard was entrusted by the Agriculture and Food Standards Policy Committee (AFC/-) to Technical Committee AFC/30, upon which the following bodies were represented: British Agricultural and Garden Machinery Association
4、Ltd. British Association for Chemical Specialities Dairy Trade Federation Electricity Supply Industry in United Kingdom Milk Marketing Board Milking Machine Manufacturers Association Ministry of Agriculture, Fisheries and Food National Farmers Union Society of Dairy Technology West of Scotland Colle
5、ge Amendments issued since publication Amd. No. Date CommentsBS5226:1991 BSI 01-2000 i Contents Page Committees responsible Inside front cover Foreword ii Section 1. General 1 Scope 1 2 Definitions 1 3 Effective cleaning and disinfecting 1 4 Legislation 2 5 Official sources of advice 2 6 Exchange of
6、 information regarding water heaters 2 Section 2. Design and materials of equipment 7 Materials and equipment 3 8 Pipelines of the milk system 3 9 Milk system 3 Section 3. Selection of water heaters 10 Water heaters 4 Section 4. In-place cleaning methods 11 Milking machines 8 12 Farm bulk milk tanks
7、 18 13 Additional information 21 Appendix A Guidance on the design, construction, installation and operation of electric water storage heaters 22 Appendix B Procedure for acceptance tests for acidified boiling water (ABW) cleaning and disinfecting systems 25 Figure 1 Layout of open top electrically
8、heated water heater 5 Figure 2 Layout of closed top electrically heated water heater (gravity discharge) 6 Figure 3 Layout of closed top electrically heated water heater (conventional discharge) 7 Figure 4 Recorder milking machine: parlour layout and circuit for circulation cleaning and disinfecting
9、 10 Figure 5 Milking pipeline machine: parlour layout and circuit for circulation cleaning and disinfecting 11 Figure 6 Milking pipeline machine: cowshed layout and circuit for circulation cleaning and disinfecting 12 Figure 7 Large bore milking pipeline machine: parlour layout and circuit for circu
10、lation cleaning and disinfecting 13 Figure 8 Recorder milking machine: parlour layout and circuit for acidified boiling water cleaning 15 Figure 9 Acidified boiling water cleaning and disinfecting record form for parlours of one or two stalls per unit 27 Table 1 Recommended capacity of water heater
11、4 Table 2 Routine cleaning methods for different types of milking machine 9 Table 3 Amounts of acid per milking unit 16 Publications referred to Inside back coverBS5226:1991 ii BSI 01-2000 Foreword This British Standard has been prepared under the direction of the Agriculture and Food Standards Poli
12、cy Committee. It supersedes BS5226:1982, which is withdrawn. This second revision of BS5226 takes into account the requirements of BS5545. BS5545-2 specifies detailed requirements for construction and performance of those parts of milking machine installations that operate during milking and include
13、s a general requirement that installations which are designed for in-place cleaning and disinfecting are so constructed that all milk contact surfaces are capable of being effectively cleaned and disinfected. BS5226 gives recommendations which, if followed, should ensure that an installation meets t
14、hat general requirement. Recommendations are made concerning the equipment, materials and operating procedures for the in-place and manual cleaning and disinfecting of milking machine installations, including farm bulk milk tanks, for the guidance of farmers, milking machine manufacturers, equipment
15、 dealers and other interested parties. It is well established that the periodic use of a process of heat disinfection is the most effective means of reducing the residual bacterial contamination in milking machine equipment and a primary recommendation is concerned with the provision of an adequate
16、supply of hot water at96 C. Recommendations are made about periodic treatments and actions to be taken if a problem with the hygienic quality of the milk arises. Attention is drawn to BS5305 which gives guidance on the cleaning and disinfecting procedures for a wide range of equipment used in the da
17、irying industry, including milking machine installations, but the recommendations in this present standard are more specific and give greater detail. The revision omits recommendations for assessment of hygienic conditions (these will be included in BS4285-4) and recommendations for water storage he
18、aters relate only to electrically operated heaters as gas and oil fired heaters are now rarely used for this application. 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. Compliance wi
19、th 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, pagesi andii, pages1 to28, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amend
20、ments incorporated. This will be indicated in the amendment table on the inside front cover.BS5226:1991 BSI 01-2000 1 Section 1. General 1 Scope This British Standard gives recommendations for the equipment and procedures concerned in the in-place cleaning and disinfecting of milking machine install
21、ations and farm bulk milk tanks. General recommendations are given in section1. Section2 gives recommendations for design and materials of certain ancillary components of milking machine installations that specifically influence in-place cleaning and disinfecting. Section3 gives guidance on the main
22、 factors that will determine the choice of water heater. Section4 gives details of recommended methods of in-place cleaning and disinfecting. Appendix A gives recommendations for the design, construction, installation and operation of electric water storage heaters, and Appendix B describes a proced
23、ure for acceptance tests for acidified boiling water (ABW) cleaning and disinfecting systems. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard, the definitions given in BS5283, BS5305 and BS55
24、45-1 apply, together with the following. 2.1 chemical disinfecting agent an agent that is suitable for disinfecting milking machines. It may be mixed with a detergent to provide a balanced product that cleans and disinfects (See clause 8 of BS5305:1984.) NOTEThese balanced products are referred to a
25、s detergent/disinfectants. 2.2 clean water water that, at the point of use, is of a quality sufficient to comply with the classification set out in section4, “Standards of Bacterial Quality”, of “Reports on Public Health and Medical Subjects No.71” 1) NOTEIn the case of small rural supplies, if bact
26、eriological examination of samples repeatedly shows inability to comply with the classification set out in the above-mentioned report, efficient chlorination or other equally effective treatment should be practised. 2.3 teatcup jetters 2) an assembly comprising a tube from the wash pipeline or the a
27、ir pipeline (milking vacuum) connected to a manifold and four cups or plugs to which the teatcups are attached during cleaning 2.4 air pipeline (milking vacuum) 2) the part of the air pipeline between the sanitary trap and the milking point(s) furthest from the vacuum pump(s), that may also form par
28、t of the cleaning circuit 2.5 air pipeline (pulsators) 2) the part of the air pipeline connecting the air pipeline (main) to the pulsators 2.6 milking pipeline 2) a pipeline which carries milk and air during milking and has the dual function of providing milking vacuum and conveying milk to a receiv
29、er 2.7 transfer pipeline 2) a pipeline the sole purpose of which during milking is to convey milk to the receiver 2.8 wash pipeline 2) a pipeline which during the cleaning process carries cleaning and disinfectant solutions from the wash trough or water heater to the milking pipeline or an air pipel
30、ine (milking vacuum). The wash pipeline is not usually in circuit during milking 2.9 delivery pipeline 2) a pipeline in which milk flows under positive pressure from a releaser or releaser milk pump or recording vessel to a storage vessel 2.10 air pipeline (main) 2) the part of the air pipeline betw
31、een the vacuum pump(s) and the sanitary trap 3 Effective cleaning and disinfecting Any recommended cleaning and disinfecting procedure that has been followed correctly may be expected to: a) leave milk contact surfaces visibly free from milk residues and other deposits; b) leave surfaces free from u
32、ndesirable residues of cleaning and disinfecting chemicals; c) reduce the count of viable bacteria to less than500000 perm 2of milk contact surfaces when the installation is rinsed as a whole and the rinse examined in accordance with BS4285. 1) The Bacteriological Examination of Water Supplies (1982
33、), published by and available from HMSO, PO Box276, London SW85ET. 2) These definitions are taken from BS5545-1.BS5226:1991 2 BSI 01-2000 NOTE 1Before using a newly installed cleaning and disinfecting system it is necessary to ensure that it is working properly. The factors in a circulation cleaning
34、 system, which are critical are: 1) design and installation of the equipment; 2) volume of solutions used in the cleaning and disinfecting process; 3) temperatures of the solutions used in the cleaning and disinfecting process; 4) chemical strength of the cleaning and disinfecting solutions; 5) flow
35、 rates and the distribution of the cleaning and disinfecting solutions throughout the plant. With acid boiling water cleaning, heat is the main disinfecting agent. The concentration of the solutions used is therefore less critical. However all of the other criteria apply equally. It is normally the
36、responsibility of the installers to examine the system to ensure that it is operating correctly and to provide a written report to this effect. NOTE 2For methods of assessing hygienic conditions seeBS4285-4. 4 Legislation The more important regulations directly affecting milking installations in Eng
37、land, Wales, Scotland and Northern Ireland, current at the date of publication of this code, are listed in 3.2 of BS5545-2:1988. NOTEIn some localities in Scotland there are byelaws that require all dairy utensils to be rinsed with sterile water after cleaning and disinfecting. The local authority t
38、herefore should be consulted. 5 Official sources of advice Further advice on milking installations and cleaning and disinfecting may be obtained from the following sources. a) In England and Wales: Agricultural Development and Advisory Service of the Ministry of Agriculture, Fisheries and Food. b) I
39、n Scotland: Advisory Officers of the Scottish Agricultural College, Model Dairy Byelaws,1961, prepared by the Department of Health for Scotland and published by HMSO. c) In Northern Ireland: Department of Agriculture for Northern Ireland, Milk Production Advisory Service. 6 Exchange of information r
40、egarding water heaters Recommendations for the design, construction, installation, operation and selection of electric water storage heaters capable of providing boiling water are given in section3 andAppendix A. Early consultation and exchange of information should take place between customer and s
41、upplier, who should provide dimensioned drawings of the water heater and necessary pipelines.BS5226:1991 BSI 01-2000 3 Section 2. Design and materials of equipment 7 Materials and equipment The installation should comply with BS5545-2. Attention is drawn to Table3 of BS5305:1984 which gives details
42、of the compatibility of materials of construction with cleaning and disinfecting agents. 8 Pipelines of the milk system The air pipeline (milking vacuum) and the air pipeline from the milk receiver should be connected directly and separately to the sanitary trap or traps. 9 Milk system 9.1 General T
43、he milk system should comply with BS5545-2. 9.2 Materials and duty Any valve, tap, reducing bush or plug in the milk system should be constructed from a suitable rigid material. Provision should be made for complete drainage of all parts of the milking machine installation. (See also 7.1 and clause
44、8 of BS5545-2:1988.) 9.3 Teatcup jetters Teatcup jetters should be of a material capable of withstanding cleaning and disinfecting fluids at temperatures up to96 C and should be designed to make an airtight seal with the teatcup shell or liner during the cleaning and disinfecting process. 9.4 Record
45、er jars Recorder jars should be designed or fitted with a means of ensuring even distribution of cleaning and disinfecting fluid over the internal surface during washing without adversely affecting the vacuum in the recorder jar during milking. (See also clause 16 of BS5545-2:1988.) The spreader dev
46、ice at the top of the recorder jar should be of such a design that it is permanently positioned so as to direct cleaning solution around the whole of the internal surface of the recorder jar. 9.5 Milk meters and other attachments Milk meters and other attachments such as filters, mastitis detectors,
47、 milk flow indicators, coolers and ancillary equipment not forming part of the basic milking system, unless specifically designed for in-place cleaning and disinfecting at temperatures up to96 C, should be removed and cleaned and disinfected separately. 9.6 Flexible tubes Flexible tubes forming part
48、 of the milking system that come into contact with milk should be renewed at least once a year. (See also clauses 12 and 18 of BS5545-2:1988.) 9.7 Plate or tubular coolers If plate or tubular coolers are fitted, they should comply with the following. a) There should be means to adjust or bypass the
49、milk flow control valve to permit adequate flow of the cleaning and disinfecting fluid through the cooler. If the rate of flow through the cooler is having a detrimental effect on the plant flow rate either the cooler capacity should be increased or a bypass tube fitted to take some of the solution from the plant. b) There should be means, preferably automatic, to stop the flow of coolant during the washing cycle. c) Valves should be fitted in the delivery lines to enable cleaning fluids to be drained from the cooler after cleaning. NOTEThe quantity of
