BS 4513-1969 Specification for lead bricks for radiation shielding《辐射屏蔽用铅砖规范》.pdf

1、BRITISH STANDARD BS 4513:1969 Specification for Lead bricks for radiation shieldingBS4513:1969 This British Standard, having been approved by the Nuclear Energy Industry Standards Committee, was published underthe authority of the Executive Board on 31 October 1969 BSI 12-1999 The following BSI refe

2、rences relate to the work on this standard: Committee reference NCE/2 Draft for comment 68/10423 ISBN 580 05563 9 Co-operating organizations The Nuclear Energy Industry Standards Committees, under whose supervision this British Standard was prepared, consist of representatives from the following Gov

3、ernment departments and scientific and industrial organizations: Association of Consulting Engineers British Electrical and Allied Manufacturers Association* British Insurance (Atomic Energy) Committee British Mechanical Engineering Confederation Department of Employment and Productivity (H.M. Facto

4、ry Inspectorate)* Electricity Council, The Central Electricity Generating Board and the Area Boards in England and Wales* Institution of Chemical Engineers Institution of Electrical Engineers Institution of Mechanical Engineers Lloyds Register of Shipping Ministry of Power* Scientific Instrument Man

5、ufacturers Association of Great Britain United Kingdom Atomic Energy Authority* The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented in the committees entrusted with the preparation of

6、 this British Standard: Board of Trade British Institute of Radiology British Steel Industry Hospital Physicists Association Radiological Protection Service Society for Radiological Protection Amendments issued since publication Amd. No. Date of issue CommentsBS4513:1969 BSI 12-1999 i Contents Page

7、Co-operating organizations Inside front cover Foreword ii 1 General requirements 1 1.1 Scope 1 1.2 Terminology 1 1.3 Materials 1 1.4 Freedom from defects 1 1.5 Inspection 2 1.6 Handling facilities 2 1.7 Tolerances 2 1.8 Identification 2 2 Specific designs 2 2.1 Chevron system (Type V) 2 2.2 Rounded

8、mating surface system (Type R) 3 Figure 1 Type V chevron wall bricks 3 Figure 2 Numbering system for Type V bricks (both 50 mm and 100 mm thicknesses) 4 Figure 3 Type R rounded mating surface wall bricks 5 Figure 4 Numbering system for Type R bricks (50 mm and 100 mm thicknesses only) 6 Figure 5 Num

9、bering system for Type R bricks (150 mm, 200 mm and 250 mm thicknesses only) 7 Figure 6 Diagrammatic illustration of functional units 8 Table 1 Schedule of bricks Chevron system (Type V) 9 Table 2 Schedule of bricks Rounded mating surface system (Type R) 10BS4513:1969 ii BSI 12-1999 Foreword This st

10、andard makes reference to the following British Standards: BS 3908, Methods for the sampling and analysis of lead and lead alloys. BS 3909, Ingot lead for radiation shielding. This British Standard is based on a draft originally prepared by the Lead Development Association, and has been completed wi

11、th the full co-operation of that Association. Before the preparation of this standard there were in existence three main systems of lead shielding bricks. Two of these three systems overlapped to some extent. In changing over to metric dimensions the opportunity has been taken to introduce rationali

12、zation and two systems only are now considered sufficient to meet all existing and future requirements. The two systems are designated as BS4513 Type V, a chevron system, and BS4513 Type R, a rounded mating surface system. A British Standard does not purport to include all the necessary provisions o

13、f 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, pages1 to 12, an inside

14、 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 inside front cover.BS4513:1969 BSI 12-1999 1 1 General requirements 1.1 Scope This British Standard specifies requirements

15、for the design of the basic bricks of two systems of lead shielding bricks. It does not give dimensional details of functional units such as window assemblies, aperture bricks, etc., although Figure 6 gives diagrammatic illustrations of the various functional units commonly in use. The scope of this

16、 standard does not include advice on methods of constructing shielding barriers from the bricks, or on the shielding thickness required. Advice on the former may be obtained from the manufacturers of the bricks, and advice on the latter from the Radiological Protection Service. 1.2 Terminology For t

17、he purposes of this British Standard the following terminology applies: 1.2.1 external surfaces the generally front and rear surfaces of bricks which remain visible after the bricks have been built into a wall 1.2.2 mating surfaces the boundary surfaces of the bricks which are adjacent to each other

18、 when the bricks are built into a wall 1.2.3 male mating surface the projecting part of a brick in the form of one or more prisms (chevrons, or “vees”) or segments of cylinders 1.2.4 female mating surface the incision in a brick in the form of one or more prisms (chevrons, or “vees”) or segments of

19、cylinders 1.2.5 loadbearing surfaces the upper and lower surfaces of a brick built into a wall, whether they be flat, rounded or chevron shaped 1.2.6 side surfaces the surfaces which are at the side 1.2.7 front and rear surfaces when it is necessary for any reason to differentiate between front (col

20、d face) and rear (hot face) external surfaces, it shall be considered normal for male mating surfaces to be on the top and right-hand side of a brick when viewing the front external surface until the bricks are built into a wall the answers to the questions “which is a front surface and which a rear

21、 surface” or “which are loadbearing surfaces and which side surfaces” cannot be established 1.3 Materials Acceptable materials for the manufacture of the bricks to this standard are given in BS3909 1) . This does not preclude the use of other lead alloys of superior properties. 1.4 Freedom from defe

22、cts All surfaces of all bricks shall be undamaged, flat (except rounded mating surfaces), and smooth, and all bricks shall be free from harmful inclusions, porosity or major segregation. 1) BS 3909, “Ingot lead for radiation shielding”.BS4513:1969 2 BSI 12-1999 1.5 Inspection The method of inspectio

23、n procedure shall be decided between the manufacturer and the purchaser. Where independent tests are agreed upon, sampling shall be in accordance with BS3908 2) . NOTEThe testing for porosity by direct weighing is unsatisfactory unless the individual brick dimensions and tolerances are taken into ac

24、count. Where it is thought to be necessary, the apparent density of a brick can be checked by weighing the brick in air and water; if the apparent density obtained is less than11.0g/cm 3gamma radiation testing (source and scintillation counter method) shall then be carried out. 1.6 Handling faciliti

25、es All bricks exceeding25kg (55lb) are to be fitted in their upper loadbearing surface with a threaded hole with a wire thread insert for use with an eyebolt to facilitate lifting. This does not apply to those functional bricks in which a sling can obviously be engaged. 1.7 Tolerances The dimensions

26、 of the bricks shall be subject to the following tolerances: 1.8 Identification To avoid confusion between existing inch-dimensioned bricks and the metric bricks specified in this standard, all bricks to this standard shall be marked indelibly on one face with the letter M, not less than15mm in heig

27、ht. The letter should not be stamped into the brick, but should be marked with some form of indelible ink, or with paint. 2 Specific designs 2.1 Chevron system (Designated Type V) 2.1.1 General description. The system comprises two basic thicknesses:50mm and100mm. Mating surfaces of all bricks have

28、one chevron per50mm of thickness (Figure 1 shows a plan of the basic bricks involved in this system). A list of types of plain wall bricks for both thicknesses, and the face dimensions of these bricks are given in Table 1. A diagram of a wall showing all the bricks listed in Table 1 is given in Figu

29、re 2. 2.1.2 Description of functional units. There is a range of functional units to permit the performance of necessary operations and functions. These include plugs, ports, sphere units, and window bricks; the various functional units are shown diagrammatically in Figure 6. The overall design of t

30、hese bricks shall conform to the tolerances listed in1.7 and the general dimensions of these bricks shall be either the same as, or multiples of the dimensions of, the plain bricks described in2.1.1. 2) BS 3908, “Methods for the sampling and analysis of lead and lead alloys”. Measurements Tolerances

31、 On linear measurements: 0100 mm + 0.0 0.4 mm 101 mm and over + 0.0 0.6 mm On squareness: 4 On chevron angles: (on female angles) + 0 15 (on male angles) + 15 0 On radii of rounded mating surfaces: (male and female radii) + 0.0 0.4 mmBS4513:1969 BSI 12-1999 3 2.2 Rounded mating surface system (Desig

32、nated Type R) 2.2.1 General description. The system comprises five basic thicknesses:50mm,100mm,150mm,200mm, and250mm. Mating surfaces consist of a male or female rounded face with a flat shoulder on each side of the rounded portion. A small clearance is provided for in the depth of the rounded port

33、ions. (Figure 3 shows the basic bricks involved in this system). A list of types of plain wall bricks in all thicknesses with their face dimensions is given in Table 2. Diagrams of walls showing all the bricks listed in Table 2 are given in Figure 4 and Figure 5. 2.2.2 Description of functional unit

34、s. There is a range of functional units to permit the performance of all necessary operations and functions. These include plugs, ports, sphere units and window bricks; the various functional units are shown in Figure 6. The overall design of these bricks shall conform to the tolerances listed in1.7

35、 and the general dimensions of these bricks shall be either the same as, or multiples of the dimensions of, the plain bricks described in2.2.1. Figure 1 Type V chevron wall bricksBS 4513:1969 4 BSI 12-1999 Figure 2 Numbering system for Type V bricks (both 50 mm and 100 mm thicknesses)BS4513:1969 BSI

36、 12-1999 5 T R S F S M 50 20 5.4 5.6 100 60 9.2 10.3 150 130 13 14 200 220 18 20 250 330 24 26 All dimensions are in millimetres Figure 3 Type R rounded mating surface wall bricksBS 4513:1969 6 BSI 12-1999 NOTEIn corner bricks with 100 mm thickness the additional female on the rear surface occupies

37、the whole breadth of that surface. In reverse corner bricks with 100 mm thickness the additional female on the front surface occupies the whole breadth of that surface. Figure 4 Numbering system for Type R bricks (50 mm and 100 mm thicknesses only)BS 4513:1969 BSI 12-1999 7 Figure 5 Numbering system

38、 for Type R bricks (150 mm, 200 mm and 250 mm thicknesses only)BS 4513:1969 8 BSI 12-1999 Figure 6 Diagrammatic illustration of functional unitsBS4513:1969 BSI 12-1999 9 Table 1 Schedule of bricks Chevron system (BS 4513 Type V) (See also Figure 1 and Figure 2) B = breadth of front surface of brickH

39、 = height of front surface of brick Description 50 mm thick 100 mm thick Remarks B H Type No. B H Type No. Left hand end base brick 50 100 V50/1 50 100 V100/1 Solid base. Solid left-hand side surface. Base brick 100 100 V50/2 100 100 V100/2 Solid base Interchangeable Left-hand end brick 100 100 100

40、100 Solid left-hand side surface. Corner base brick 100 100 V50/3 150 100 V100/3 Solid base. Flat right-hand side surface. Additional males on rear surface near right-hand end. Base brick 50 100 V50/4 50 100 V100/4 Solid base Interchangeable Left-hand end brick 100 50 100 50 Solid left-hand side sur

41、face. Reverse corner base brick 100 a 100 V50/5 150 a 100 V100/5 Solid base. Flat right-hand side surface. Additional males on front surface near right-hand end. Right-hand end base brick 100 100 V50/6 100 100 V100/6 Solid base. Flat right-hand side surface. Interchangeable Left-hand end top brick 1

42、00 100 100 100 Flat top. Solid left-hand side surface. Plain brick 100 100 V50/7 100 100 V100/7 Plain brick 100 50 V50/8 100 50 V100/8 Interchangeable 50 100 50 100 Plain brick 50 50 V50/9 50 50 V100/9 Corner brick 100 100 V50/10 150 100 V100/10 Flat right-hand side surface. Additional males on rear

43、 surface near right-hand end. Corner brick 100 50 V50/11 150 50 V100/11 Reverse corner brick 100 a 100 V50/12 150 a 100 V100/12 Flat right-hand side surface. Additional males on front surface near right-hand end. Reverse corner brick 100 a 50 V50/13 150 a 50 V100/13 Corner top brick 100 100 V50/14 1

44、50 100 V100/14 Flat top. Flat right-hand side surface. Additional males on rear surface near right-hand end. Reverse corner top brick 100 a 100 V50/15 150 a 100 V100/15 Flat top. Flat right-hand side surface. Additional males on front surface near right-hand end. a The breadth measurement for these

45、bricks includes the breadth of the additional males on the front surface. BS4513:1969 10 BSI 12-1999 TABLE 1 Schedule of bricks Chevron system (BS 4513 Type V) Table 2 Schedule of bricks Rounded mating surface system (BS 4513 Type R) (See also Figure 1 and Figure 2) B = breadth of front surface of b

46、rickH = height of front surface of brick Description 50 mm thick 100 mm thick Remarks B H Type No. B H Type No. Top brick 100 50 V50/16 100 50 V100/16 Flat top Interchangeable Right-hand end brick 50 100 50 100 Flat right-hand side surface. Top brick 50 100 V50/17 50 100 V100/17 Flat top Interchange

47、able Right-hand end brick 100 50 100 50 Flat right-hand side surface. Right-hand end top brick 100 100 V50/18 100 100 V100/18 Flat top. Flat right-hand side surface. (See also Figure 3, Figure 4 and Figure 5) B = breadth of front surface of brick.H = height of front surface of brick Description 50 m

48、m thick 100 mm thick Remarks B H Type No. B H Type No. Left-hand end base brick 50 100 R50/1 50 100 R100/1 Solid base. Solid left-hand side surface. Base brick 100 100 R50/2 100 100 R100/2 Solid base Interchangeable Left-hand end brick 100 100 100 100 Solid left-hand side surface Corner base brick 1

49、00 100 R50/3 100 100 R100/3 Solid base. Solid left-hand side surface. Additional female on rear surface. (Near left-hand, end on R50/3.) Base brick 50 100 R50/4 50 100 R100/4 Solid base Interchangeable Left-hand end brick 100 50 100 50 Solid left-hand side surface. Reverse corner base brick 100 a 100 R50/5 100 a 100 R100/5 Solid base. Solid left-hand side surface. Additional female on front surface. (Near left-hand end on R50/5.) Right-hand end base brick