1、BRITISH STANDARD BS 5190:1985 Specification for Pipeline filters, filter bodies and filter elements for milking installations UDC 637.116:621.648.5BS5190:1985 This British Standard, having been prepared under the directionof the Dairying Standards Committee, was published under the authority ofthe B
2、oard of BSI and comes into effect on 31January1985 BSI 09-1999 First published March 1975 First revision January 1985 The following BSI references relate to the work on this standard: Committee reference DAC/31 Draft for comment 83/54119 DC ISBN 0 580 14040 7 Committees responsible for this British
3、Standard The preparation of this British Standard was entrusted by the Dairying Standards Committee (DAC/-) to Technical Committee DAC/31 upon which the following bodies were represented: British Agricultural and Garden Machinery Association Ltd. Dairy Trade Federation Department of Agriculture Nort
4、hern Ireland Edinburgh School of Agriculture Farmers Union of Wales Filtration Society Milk Filter Manufacturers Association Milk Marketing Board Milk Marketing Board for Northern Ireland Milking Machine Manufacturers Association Ministry of Agriculture, Fisheries and Food National Farmers Union Nat
5、ional Institute for Research in Dairying North of Scotland College of Agriculture Scottish Milk Marketing Board West of Scotland Agricultural College Amendments issued since publication Amd. No. Date of issue CommentsBS5190:1985 BSI 09-1999 i Contents Page Committees responsible Inside front cover F
6、oreword ii 1 Scope 1 2 Definitions 1 3 Performance requirements 1 4 Construction 1 5 Instructions 2 6 Marking and labelling 2 Appendix A Methods of test 3 Figure 1 Testing for determination of standard test capacity, flow rate and filtration efficiency 5 Publications referred to Inside back coverBS5
7、190:1985 ii BSI 09-1999 Foreword This first revision of this British Standard has been prepared under the direction of the Dairying Standards Committee. It supersedes BS5190:1975 which is withdrawn. At the time of publication of this British Standard, no corresponding International Standard exists o
8、r is in preparation. The purpose of a pipeline filter is to remove any insoluble material, e.g.vegetable matter from dung, feed or bedding and inorganic matter from soil or dust, that has entered the milk after milk has left the udder. Such material which is called visible dirt (seeBS4938-2) can ent
9、er milk either because it has not been removed from the teats prior to applying the teat cups or because of contamination when clusters occasionally fall to the floor during milking. Milk should be free from visible dirt. In practice there is a lower limit to the smallest amount which is detectable.
10、 Some fine particles of dirt are smaller in size than fat globules and a filter which would remove fine dirt would also remove fat globules and thereby change the chemical composition of the milk. Care is therefore necessary in the selection of filter media. In general the removal of dirt by filtrat
11、ion is unlikely to improve the bacteriological quality of the milk and indeed, the prolonged use of a dirty and contaminated filter would cause bacteriological deterioration. The use of pipeline filters for milking installations does not absolve the milk producer from taking the necessary precaution
12、s to avoid dirt entering milk nor can it give him protection against legal action. Rather it is intended that pipeline filters should remove particulate matter which, in spite of good milking practice, may on occasions inadvertently enter milk. In specifying filtration efficiency it has been necessa
13、ry to make assumptions concerning the nature and quantity of visible dirt found in milk and for this purpose use has been made of surveys carried out by the National Institute for Research in Dairying. Attention is drawn to the Materials and Articles in Contact with Food Regulations (SI1978, No.1927
14、) which apply to materials in contact with milk. 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 with a British Standard does not of itself confer immunity from legal oblig
15、ations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to6, 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 the i
16、nside front cover.BS5190:1985 BSI 09-1999 1 1 Scope This British Standard specifies the performance, construction, marking and labelling requirements for pipeline filters, filter bodies and filter elements for milking machines. The filter elements may be of the single use or multi-service type. The
17、methods of test to be used for checking compliance with the requirements are given in Appendix A. NOTEThe publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this standard, the definitions of BS5545-1 apply, together with the following. 2.
18、1 pipeline filter a device comprising a filter body and one or more filter elements 2.2 filter body a device that is suitable for connection in the delivery pipeline or transfer pipeline of a milking machine and for securely housing one or more filter elements 2.3 filter element a device which, when
19、 fitted in a filter body, is intended to remove visible dirt that is not a constituent of normal milk as drawn from the cow. It may be of the single use or multi-service use type 2.4 standard test capacity the volume in litres of test milk (seeA.1.2), stated as500L or in multiples of500L, that the m
20、anufacturer claims can be filtered per milking with the efficiency specified in3.2 and without changing or cleaning the filter element 3 Performance requirements 3.1 Flow rate When tested by the method described inA.1 appropriate to its standard test capacity, the filter shall be capable of passing
21、test milk at a flow rate of3000L/h, with a pressure drop across the filter not exceeding45kPa. 3.2 Filtration efficiency When tested by the method described inA.1 appropriate to its standard test capacity, the difference between the visible dirt content of the test milk and that of the filtered test
22、 milk shall be not less than3mg/L for each sample of filtered test milk. The dirt content shall be measured in accordance with BS4938-2. In addition, the visible dirt content of each sample of the filtered test milk shall be less than2mg/L. 3.3 Pressure drop When tested by the method described inA.2
23、, the pressure drop across the filter element and body shall not exceed2kPa. 3.4 Security When tested by the method described inA.3, the filter element shall be capable of withstanding an input pressure of170kPa without detachment or damage or such distortion as would reduce the filtration efficienc
24、y below that specified in3.2. 4 Construction 4.1 General Materials used in the pipeline filter, with the exception of single service elements, that may come into contact with cleaning and disinfecting fluids shall be suitable for such contact and shall be easy to clean. NOTEAccount should be taken o
25、f the contact times and temperatures and concentrations of the chemicals to be used as well as any limitations mentioned by the filter manufacturer in his instructions regarding the employment of cleansing procedures as described in BS5226 and BS5305. 4.2 Filter bodies The filter body shall withstan
26、d, without permanent damage or distortion, a vacuum of80kPa and a pressure of200kPa. All surfaces designed to come into contact with milk, when the body is in-place within the pipeline of the milking machine, shall be smooth and easy to clean. 4.3 Filter elements Filters shall be so constructed as t
27、o allow easy removal and replacement of the filter element and such that, an element or other whole component, if it becomes detached for any reason, cannot be discharged with the milk. Multi-service elements shall be easy to clean after removal and shall also be capable of being cleaned and disinfe
28、cted in-place.BS5190:1985 2 BSI 09-1999 5 Instructions The following information shall be provided with each pipeline filter. a) The correct method of installation of the filter. NOTEThe following should be taken into account. 1) The position of the filter unit will be governed by the type of milkin
29、g installation but it should not be located where it will affect the milking vacuum; therefore, it should not be fitted into a milking pipeline which has the dual function of providing milking vacuum and conveying milk to the milk receiver. 2) The need to locate the filter where it is readily access
30、ible for inspection, dismantling and re-assembly and so that loss of milk will be minimized. 3) The need to locate the filter in such a position and orientation to ensure that it can be easily and completely drained. b) The correct method of assembling and dismantling the filter. c) Recommendations
31、for cleaning and disinfecting the filter, taking into account the recommendations of BS5226 and BS5305, with particular regard to the need for dismantling. NOTEThe following should be taken into account. 1) The need to remove and discard single service elements after each milking. 2) The need to cle
32、an and disinfect filter bodies and multi-service elements after each milking. 3) The need to inspect multi-service filter elements after cleaning and before re-assembling, and to replace damaged elements. d) Depending on the design of the pipeline filter, instructions for using the filters in line w
33、ith plate coolers during the cleaning and disinfection of the milking plant. The information shall refer to the fact that separate clean filters shall be used for this purpose, and not those used for filtering the milk. e) A statement of the need to ensure that replacement filter elements are suitab
34、le for use with the filter body. f) A statement to the effect that filters become clogged faster, and before their standard test capacities are reached, if the milk is dirty or if colostrum milk is allowed to pass through the filter. The information shall also include advice that, if the milk is dir
35、ty, remedial action involving cleaning of both the cows and the clusters during milking will normally be necessary. 6 Marking and labelling 6.1 Filter bodies Filter bodies shall be clearly and durably marked with the following. a) The manufacturers or vendors name or trademark, together with an iden
36、tification (name, symbol, numbers) of the model. b) The number and date of this British Standard, i.e.BS5190:1985 1) . 6.2 Filter elements Filter elements and/or the boxes, wrappers, package inserts or containers in which they are packed shall be clearly marked with the following. a) The manufacture
37、rs name or trade mark or other means of identification. b) The number and year of this British Standard, i.e.BS5190:1985 1) . c) The standard test capacity in accordance with2.4. d) The words “single service” or “multi-service” according to type. e) The identification (name, symbol, numbers) of the
38、filter body or bodies with which the elements are designed to be used. 1) Marking BS5190:1985 on or in relation to a product is a claim by the manufacturer that the product has been manufactured to the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturers r
39、esponsibility. Enquiries as to the availability of third party certification to support such claims should be addressed to the Director, Quality Assurance Division, BSI, Maylands Avenue, Hemel Hempstead, Herts HP24SQ for certification marks administered by BSI or to the appropriate authority for oth
40、er certification marks.BS5190:1985 BSI 09-1999 3 Appendix A Methods of test A.1 Determination of standard test capacity, flow rate and filtration efficiency A.1.1 Apparatus A.1.1.1 Test rig. The recommended test rig is shown in Figure 1. It consists of two500L tanks fitted with mechanical stirrers,
41、a centrifugal milk pump and pressure gauge, together with the necessary interconnecting pipework and control cocks for the filter under test. The rig should be arranged so that the milk flows downwards through the system. The milk supply tank should be free-draining, preferably with a shallow slippe
42、r outlet, and should be constructed so that an outlet vortex does not form until after the measurement of flow rate described inA.1.3.4. The tanks should be marked to show the500L level in the supply tank and the480L level in the receiver. The mechanical stirring equipment on each tank should be suc
43、h that during continuous agitation all foreign matter in the milk is distributed uniformly throughout the batch. The centrifugal milk pump should, under the operation condition, give a minimum delivery pressure of45kPa at a flow rate of3000L/h and should be arranged with the outlet at the bottom. Th
44、e pressure gauge should have a scale range not less than0kPa to50kPa and not more than0kPa to100kPa. The filter under test should be mounted so that all sediment passing the filter element is discharged with the filtrate into the filtrate receiver. A.1.1.2 Apparatus for the preparation of coarse dir
45、t, as described inB.2 of BS4938-2:1982, and for weighing small quantities of this material to 0.5mg. A.1.1.3 Filtration apparatus, as described in clause5 of BS4938-2:1982 to assess the visible dirt content of milk. A.1.2 Test milk Use whole milk of marketable quality with a butterfat content in the
46、 range3.5% to4% at a temperature of30 C to35 C and filter it once through a pipeline filter of the type to be tested. Take a1L sample of this milk and determine its visible dirt content in accordance with the method described in BS4938-2. Record this dirt content asx mg/L of basic dirt. Prepare the
47、test milk by adding, to this filtered milk,3mg/L of coarse dirt prepared in accordance withB.2 of BS4938-2:1982 and stirring. NOTE 1The dirt content of the test milk should be therefore(3+x mg/L). NOTE 2It is helpful to presoak the weighed dirt in1L of clean water to assist wetting and mixing. A.1.3
48、 Method for filters of500L standard test capacity A.1.3.1 In a preliminary run using water, with filter complete and with the filter element under test in position, set the rate cock to give a flow rate of approximately4000L/h. Empty the system and fit either a new single service or a clean multi-se
49、rvice filter element which has been subjected to the test for security described inA.3. A.1.3.2 Fill the milk supply tank to the500L level with test milk(A.1.2) at a temperature of30 C to35 C. Stir well and take a1L sample for future reference if required. Run the stirrer continuously throughout the test. A.1.3.3 After stirring sufficiently to ensure thorough wetting and mixing of the dirt open the outlet cock of the milk supply tank and start the milk pump. Start the mechanical stirrer in the filtrate receiver and check that the flow rate is about4000L/h. NOTEIn m
