BS 7459-1-1995 Rotating sprinklers for irrigation equipment - Specification for design and operational requirements《灌溉设备的旋转喷洒头 设计和操作要求规范》.pdf

《BS 7459-1-1995 Rotating sprinklers for irrigation equipment - Specification for design and operational requirements《灌溉设备的旋转喷洒头 设计和操作要求规范》.pdf》由会员分享，可在线阅读，更多相关《BS 7459-1-1995 Rotating sprinklers for irrigation equipment - Specification for design and operational requirements《灌溉设备的旋转喷洒头 设计和操作要求规范》.pdf（18页珍藏版）》请在麦多课文档分享上搜索。

1、BRITISH STANDARD BS 7459-1: 1995 ISO 7749-1: 1995 Rotating sprinklers for irrigation equipment Part 1: Specification for design and operational requirements ICS 65.060.35BS7459-1:1995 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published underth

2、e authority of the Standards Board and comesintoeffect on 15 October 1995 BSI 08-1999 First published August 1991 Second edition October 1995 The following BSI references relate to the work on this standard: Committee reference AGE/30 Draft for comment 93/702634 DC ISBN 0 580 24867 4 Committees resp

3、onsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee AGE/30, Irrigation and drainage equipment, upon which the following bodies were represented: ADAS Agricultural Engineers Association British Agricultural and Garden Machinery Association L

4、td. British Turf and Landscape Irrigation Association Health and Safety Executive Silsoe College (Cranfield Institute of Technology) Silsoe Research Institute UK Irrigation Association Well Drillers Association Amendments issued since publication Amd. No. Date CommentsBS7459-1:1995 BSI 08-1999 i Con

5、tents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 General requirements 3 5 General test conditions 3 6 Strength tests 5 7 Operating tests 6 8 Durability tests 8 9 Marking 8 10 Data to be supplied by manufacturer 9 Annex A (

6、normative) Flowrates and their equivalent nozzle diameters 10 Figure 1 Location of pressure gauge for measurement of sprinkler pressure 2 Figure 2 Range of effective pressure 2 Figure 3 Distribution curve 7 Table 1 Required number of test specimens and acceptance number 4 Table 2 Test pressure 5 Tab

7、le 3 Uniformity of distribution 8 Table A.1 Flowrates and equivalent nozzle diameters 11 List of references Inside back coverBS7459-1:1995 ii BSI 08-1999 National foreword This British Standard has been prepared by Technical CommitteeAGE/30. It is identical with ISO7749-1:1995 Agricultural irrigatio

8、n equipment Rotating sprinklers Part1: Design and operational requirements, published by the International Organization for Standardization (ISO). It supersedes BS7459-1:1991 which is withdrawn. Part 1 specifies the design and operational requirements for rotating sprinklers and sprinkler nozzles fo

9、r irrigation equipment and that method of test. Part 2 specifies the conditions and methods used for testing the uniformity of distribution and test methods of rotating sprinklers. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards a

10、re responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard ISO 7-1:1994 BS 21:1985 aSpecification for pipe threads for tubes and fittings where pre

11、ssure-tight joints are made on the threads (metric dimensions) (Technically equivalent) ISO 2859-1:1989 BS 6001 Sampling procedures for inspection by attributes Part1:1991 Specification for sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection (Identical) ISO 3951:1989 B

12、S 6002 Sampling procedures for inspection by variables Part 1:1993 Specification for single sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection (Identical) ISO 7749-2:1990 BS 7459 Rotating sprinklers for irrigation equipment Part2:1991 Methods of test for uniformity of

13、 distribution (Identical) a Technically equivalent to ISO 7-1:1982. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 12, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments inc

14、orporated. This will be indicated in the amendment table on the inside front cover.BS7459-1:1995 BSI 08-1999 1 1 Scope This part of ISO7749 specifies the design and operational requirements of rotating sprinklers and sprinkler nozzles for agricultural irrigation equipment and their test methods. It

15、applies to sprinklers intended for assembly in pipeline networks for irrigation and operation at the pressures recommended by the manufacturer. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO7749. At t

16、he time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part ofISO7749 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintai

17、n registers of currently valid International Standards. ISO 7-1:1994, Pipe threads where pressure-tight joints are made on the threads Part 1: Dimensions, tolerances and designation. ISO 2859-1:1989, Sampling procedures for inspection by attributes Part1: Sampling plans indexed by acceptable quality

18、 level (AQL) for lot-by-lot inspection. ISO 3951:1989, Sampling procedures and charts for inspection by variables for percent nonconforming. ISO 7749-2:1990, Irrigation equipment Rotating sprinklers Part2: Uniformity of distribution and test methods. 3 Definitions For the purposes of this part of IS

19、O7749, the following definitions apply. 3.1 rotating sprinkler device which by its rotating motion around its vertical axis distributes water over a circular area or part of a circular area 3.2 nozzle aperture or adjutage of the sprinkler through which the water is discharged NOTE 1A sprinkler may c

20、ontain one or several cylindrical nozzles, or nozzles of other shapes. It may refer to either a single nozzle, or to a combination of nozzles in a multinozzled sprinkler. 3.3 equivalent nozzle diameter theoretical nozzle outlet diameter, calculated on the basis of nozzle pressure and flowrate NOTE 2

21、The calculation is described inAnnex A. 3.4 minimum effective pressure, p min lowest working pressure declared by the manufacturer, measured near the base of the sprinkler, at a point situated about0,2m below the main nozzle of the sprinkler, but with the pressure gauge situated in the same plane as

22、 the main nozzle (SeeFigure 1.) 3.5 maximum effective pressure p max highest working pressure declared by the manufacturer, measured near the base of the sprinkler, at a point situated about0,2m below the main nozzle of the sprinkler, but with the pressure gauge situated in the same plane as the mai

23、n nozzle (SeeFigure 1.) 3.6 range of effective pressure pressure range between the minimum effective pressure, p min , and the maximum effective pressure, p max , declared by the manufacturer as the pressure range in which the sprinklers operate effectively (SeeFigure 2.) 3.7 test pressure water pre

24、ssure within the range of the effective pressure(3.6) used for testing the sprinkler 3.8 nominal flowrate quantity of water per unit of time discharged by a sprinkler with a specific nozzle at ambient temperature at the test pressure declared by the manufacturer in the manufacturers data sheets 3.9

25、radius of throw farthest distance measured, while the sprinkler is rotating normally, from the sprinkler centreline to the point at which the sprinkler deposits water at the minimum rate of0,25mm/h for a sprinkler whose discharge exceeds75l/h, and0,13mm/h for a sprinkler whose discharge is equal to

26、or less than75l/h, typically measured at any arc of coverage except at the arc extremes for part-circle sprinklers NOTE 3The respective values relate only to sprinklers in continuous operation. 3.10 effective diameter of coverage twice the radius of throw(3.9)BS7459-1:1995 2 BSI 08-1999 3.11 traject

27、ory height maximum height of the trajectory of the water stream above the sprinkler nozzle when operating at the test pressure 3.12 trajectory angle angle of the water stream above a horizontal plane, as discharged from the sprinkler nozzle operating at the test pressure 3.13 normal trajectory angle

28、 trajectory angle of20 and greater 3.14 low trajectory angle trajectory angle smaller than20 3.15 sprinkler spacings distance between sprinklers along the irrigation laterals and distance between laterals 3.16 coefficient of distribution uniformity, CDU uniformity of water application rate, depth or

29、 amount, at a given pressure and at a particular spacing, expressed as a percentage NOTE 4The CDU is determined by the Christiansen method described in ISO7749-2. 3.17 wind speed average wind speed at the test site during the test of distribution uniformity of the sprinkler NOTE 5The calculation is

30、described in ISO7749-2. 3.18 irrigation lateral branch supply line on which water distribution devices (sprinklers, emitters, drippers) are mounted directly or by means of fittings, risers or tubes 3.19 water distribution curve curve of application rates of the water accumulated in collectors laid o

31、ut along a wetted radius, as a function of the distances of the collectors from the sprinkler 3.20 part-circle sprinkler rotating sprinkler designed to irrigate a sector of a circular area, either with or without an attachment which enables it to be adjusted to irrigate the entire circular area 3.21

32、 pop-up sprinkler irrigation sprinkler which is designed for installation so that the nozzle is below ground level when not operating NOTE 6When the sprinkler is pressurized, the part containing the nozzle is raised so that the nozzle is above ground level for irrigation. When the pressure is shut o

33、ff, the part containing the nozzle returns to its original position. 3.22 collector receptacle into which the water discharged by the sprinkler is deposited during the test for radius of throw Figure 1 Location of pressure gauge for measurement of sprinkler pressure Figure 2 Range of effective press

34、ureBS7459-1:1995 BSI 08-1999 3 3.23 ambient temperature temperature of the surroundings in the range of15 C to 30 C 4 General requirements 4.1 Materials Sprinklers shall be made of metals or plastics. Metal sprinklers shall be made from a copper alloy or of other metals whose mechanical properties a

35、nd resistance to corrosion when used with irrigation water are not less suitable than those of copper alloys. Plastics parts of the sprinklers which conduct water and which are exposed to sunlight shall be opaque. Plastics parts of sprinklers exposed to ultraviolet (UV) radiation shall contain an ad

36、ditive resistant to UV radiation. On request, the manufacturer shall provide information as to the resistance of the sprinkler to chemicals used in agriculture. 4.2 Construction and workmanship 4.2.1 Sprinkler parts, including nozzles, of the same type and manufacture shall be interchangeable. If th

37、e construction of the sprinkler permits replacement of parts, it shall be possible to replace the parts with standard tools; if special tools are required, the manufacturer shall be able to supply these tools. 4.2.2 The sprinkler shall be connected to the riser by means of threads or other means tha

38、t ensure proper strength of the connection. Sprinklers intended for threaded connection (see4.3) to the pipeline or to risers shall be equipped with spanner flats or some other configuration, suitable for gripping with a standard open or adjustable wrench. Sprinklers having a plastics part for conne

39、ction to risers may have other configurations (projections, slots, etc.) to facilitate manual assembly and removal. 4.2.3 Replaceable nozzles shall be attached to the sprinkler by threading, push-in or any other method that permits rapid and effective replacement under service conditions. 4.3 Thread

40、ed connections In the case of sprinklers intended for threaded connection to a pipeline or to a riser, the threads shall comply with ISO7-1. Alternatively, other threads may be allowed provided that a suitable adaptor shall be supplied with each threaded connection, making it comply with ISO7-1. 4.4

41、 Performance requirements The following performance requirements apply to sprinklers having one or more nozzles. 4.4.1 Effective pressures The sprinkler shall rotate continuously and regularly in its designed direction within its entire range of effective pressure from the minimum effective pressure

42、, p min , up to the maximum effective pressure, p max . 4.4.2 Actuating mechanism The actuating mechanism of the sprinkler shall operate in accordance with7.6 at any inclination of the riser up to10 from the vertical. 5 General test conditions 5.1 Sampling and acceptance tests 5.1.1 Type test The te

43、st specimens shall be taken at random by the test laboratory representative from a quantity of at least20sprinklers. The number of test specimens required for each test shall be as specified in Table 1. If the number of defective specimens in the sample does not exceed the acceptance number specifie

44、d inTable 1, the sample shall be considered as complying with the requirements of this part ofISO7749. If the number of defective specimens in the sample is greater than the acceptance number, the sample shall be considered as not complying with the requirements of this part of ISO7749. 5.1.2 Accept

45、ance tests When acceptance of manufacturing lots or of shipments is required, conduct the sampling in accordance with ISO2859-1:1989, based on acceptable quality level (AQL)2,5 and special inspection levelS-4. Test all the test specimens in the sample, selected at random as provided for in TableII-A

46、 of ISO2859-1:1989, as specified in6.3. The shipment or manufacturing lot complies with this part ofISO7749 if the number of defective specimens found in the test does not exceed the acceptance number specified in ISO2859-1. For the other tests, select the test specimen at random to conform with the

47、 number specified inTable 1. The shipment or manufacturing lot is considered to comply with this part of ISO7749 if the number of defective specimens found in the other tests does not exceed the acceptance number specified inTable 1.BS7459-1:1995 4 BSI 08-1999 Table 1 Required number of test specime

48、ns and acceptance number It is not necessary to perform the tests in7.3 and clause8 within the framework of the acceptance tests if a type test has been carried out for the same sprinkler model and provided that the manufacturer has not introduced structural changes in the sprinkler since the type t

49、est. The manufacturer shall give proof that no changes have been made in the product to obviate the need to perform type tests. 5.2 Accuracy of measuring devices The allowable deviation of the measuring devices from their true values shall be as follows: pressure: 2% flowrate: 1% Measure the rotation velocity with a stopwatch, graduated in divisions of0,1s. 5.3 Test pressure Determine the test pressure of the sprinkler as the typical operating pressure declared by the manufacturer. If the operating pressure is given as a range of press