1、BRITISH STANDARD BS 3475:1976 Incorporating Amendment No.1 Specification for Bowl stands for use in hospitals UDC 615.478.78 CONFIRMED DECEMBER 2007BS3475:1976 This BritishStandard, having been approved by the Committeefor Tubular FramedEquipment for Hospitals,was published underthe authority of the
2、 Executive Board on 30January1976 BSI 12-1999 First published April1962 First revision April1969 Second revision January1976 The following BSI references relate to the work on this standard: Committee reference SGC/33 Draft for comment73/62346 DC ISBN 0 580 08768 9 Co-operating organizations The Com
3、mittee for Tubular Framed Equipment for Hospitals, under whose supervision this BritishStandard was prepared, consists of representatives from the following Government departments and professional, scientific and industrial organizations: British Rubber Manufacturers Association British Surgical Tra
4、des Association (Inc.) Department of Health and Social Security Department of the Environment Institute of Purchasing and Supply King Edwards Hospital Fund for London National Association of Hospital Supplies Officers Royal College of Midwives Royal College of Nursing and National Council of Nurses
5、of the UnitedKingdom Royal College of Physicians of London Teaching Hospitals Association Amendments issued since publication Amd. No. Date of issue Comments 4220 March1983 Indicated by a sideline in the marginBS3475:1976 BSI 12-1999 i Contents Page Co-operating organizations Inside front cover Fore
6、word ii 1 Scope 1 2 References 1 3 Dimensions 1 4 Materials 1 5 Construction 1 6 Castors 2 7 Buffers 2 8 Finish 2 9 Bowl 2 10 Marking 2 Figure 1 Single bowl stand 3 Figure 2 Typical single bowl stand 4 Figure 3 Two-bowl side-by-side bowl stand showingonetypicalarrangementof bowl supports 4 Figure 4
7、Two-bowl side-by-side stand showing two alternativetypicalarrangements of bowl supports 5 Figure 5 Rubber buffers 6 Publications referred to Inside back coverBS3475:1976 ii BSI 12-1999 Foreword This BritishStandard forms one of a series relating to tubular framed hospital equipment. The revision has
8、 been undertaken at the request of the Department of Health and Social Security. In this revision provision has been made for a gap in the bowl ring to allow passage of the arm when lifting the bowl, and the smaller bowl size of305mm diameter has been deleted so that only one bowl of355mm diameter i
9、s specified. Certification. Attention is drawn to the certification facilities described on the inside back cover of this standard. 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. Com
10、pliance 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, pagesi andii, pages1 to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have
11、had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS3475:1976 BSI 12-1999 1 1 Scope This BritishStandard specifies the basic requirements relating to materials, dimensions, construction and electrical safety precautions for single and double bowl st
12、ands for use in hospitals. 2 References The titles of the BritishStandards referred to in this standard are listed on the inside back cover. 3 Dimensions The dimensions of the bowl stand shall be as follows. Internal diameter of the bowl ring:310mm, to carry a355mm diameter bowl. Overall and effecti
13、ve heights: the overall height with the bowl in position for both the single bowl stand and the two-bowl side-by-side stand shall be855mm (see Figure 1) and the effective height from the floor to the top of the tie-bars shall be250mm. For the two-bowl side-by-side stand the distance between the ring
14、s (clear) shall be100mm. The maximum overall dimensions for the single bowl stand shall be450mm 450mm and for the two-bowl stand shall be800mm width 450mm depth. The dimensions specified above shall be subject to a tolerance of 3mm. 4 Materials 4.1 The framework of the stand shall be of electrically
15、 welded stainless steel tubing, to the requirements of BS3014, grade2. 4.2 The upright supports shall be not less than25mm outside diameter and1.6mm wall thickness. The tube for the rings, bowl supports and ring tie-bars shall be16mm outside diameter and1.6mm wall thickness. 4.3 For single bowl stan
16、ds the horizontal tie-bar tubes shall be not less than12mm outside diameter and1.6mm wall thickness. 4.4 For two-bowl stands the horizontal tie-bar tubes may be arranged in the form of one longitudinal member joining the centres of two transverse members. The tie-bar tubes shall be not less than16mm
17、 outside diameter and1.6mm wall thickness. 5 Construction 5.1 A bowl stand shall comprise a framework of tubular metal complying with the requirements of clause3 and having either one bowl ring or two bowl rings side-by-side, at the option of the purchaser, each ring to support a stainless steel bow
18、l. 5.2 The framework of the stand shall be either inert-gas arc welded or resistance welded. For inert-gas metal arc or inert-gas tungsten arc welding the filler rod shall comply with the requirements of BS2901; Part 2, type347S96. Bowl support tubes shall be welded either to the upright or to the r
19、ings. Tie bars shall be welded to the uprights. 5.3 Welding shall be in accordance with the requirements of BS3019-2, neatly and correctly executed on fully prepared joints, free from all defects and finishing marks, having adequate penetration to ensure complete fusion of metals. The dressing of we
20、lds shall be accurately executed to avoid impairment of joint strength. There shall be no sharp edges or crevices which may harbour dirt or foreign matter. 5.4 There shall be no exposed sharp edges on the framework or on the finished stand and no unsealed formation which may harbour dirt or foreign
21、matter. All exposed ends of the tube shall be sealed by welding. 5.5 Electrical continuity shall be maintained between the bowl and the framework. 5.6 Each bowl ring shall comprise a tube bent into a circle with a100mm gap which shall be central to any pair of adjacent legs on single bowl stands and
22、 at opposite ends on double bowl stands. The ends of the tube shall be plugged, welded and smoothly finished. 5.7 The bowl support tubes shall be arranged in such a manner as to provide a stable support for the bowl. Some typical ways of effecting this are shown in Figure 2, Figure 3 and Figure 4. 5
23、.8 The distance between the top of the bowl support tubes and the top of the rings shall be such that the bowl is supported with its rim approximately50mm above the top of the ring. The function of the ring is to act as a locator only. This will also allow for aseptic handling and easy removal of th
24、e bowl. 5.9 The framework for single bowl stands shall consist of three vertical tubes, equidistant from each other. The vertical tubes shall be curved or set inwards at the upper end with an internal radius of75mm to support and be joined to the side of the ring. Three tie-bars shall be provided, j
25、oining the vertical tubes.BS3475:1976 2 BSI 12-1999 5.10 The framework for two-bowl stands shall consist of two pairs of vertical tubes. The vertical tubes shall be curved or set inwards at the upper end with an internal radius of75mm. One ring tie-bar shall be provided supporting and joined to the
26、rings on their undersurface. Tie-bars shall be provided joining the vertical tubes. 6 Castors 6.1 Each single bowl stand shall be fitted with three castors and each two-bowl stand shall be fitted with four castors. Castors shall be securely fixed and shall meet the anti-static and other requirements
27、 of BS2099-1. Castor wheels shall be65mm diameter and of a type as ordered by the purchaser. 6.2 The castor tyres shall be of a composition which does not permanently stain the floor. The maximum limit of electrical resistance shall be10 4 ohms. 7 Buffers The bowl stand shall be fitted with buffers
28、for the purpose of noise abatement. The buffers shall be attached to bowl rings and bowl supports and shall be of anti-static rubber composition having an electrical resistance not exceeding10 6 ohms; the electrical resistance of the buffers shall be tested between the bowl and the metal framework o
29、f the stand by the method described in BS2050. They shall be of coiled pattern as illustrated in Figure 5. The buffers shall be clearly and indelibly marked with a yellow spot to indicate that they are anti-static. The colour used for this purpose shall be similar to no. 355 “lemon” as specified in
30、BS381C. 8 Finish 8.1 Sufficient welding materials shall be applied to allow for subsequent dressing smooth all over, without weakening the joint. There shall be no exposed sharp edges on the framework or on the finished trolley, and no unsealed formation which may harbour dirt or foreign matter. The
31、 finish, including welds, shall be mirror polished to the requirements of finish no.8 of BS1449-2. 8.2 The castors (except for the wheel centres) shall be chromium plated to the requirements of service condition no.2 of BS1224. 9 Bowl The bowl shall comply with the requirements specified for355mm di
32、ameter wash bowls in BS1823. 10 Marking 10.1 Bowl stands complying with the requirements of this BritishStandard shall be clearly and indelibly marked with the following. a) The name, trade mark or other means of identification of the manufacturer. b) The year of manufacture. c) The number of this B
33、ritishStandard i.e.BS3475. 10.2 The castors shall be marked as required in BS2099-1. NOTEThe mark BS3475 on or in relation to the product is a claim by the manufacturer that it complies with the requirements of this BritishStandard.BS3475:1976 BSI 12-1999 3 Figure 1 Single bowl standBS3475:1976 4 BS
34、I 12-1999 Figure 2 Typical single bowl stand, plan view Figure 3 Two-bowl side-by-side bowl stand showing one typical arrangementofbowlsupportsBS3475:1976 BSI 12-1999 5 Figure 4 Two-bowl side-by-side stand showing two alternative typicalarrangementsofbowlsupportsBS3475:1976 6 BSI 12-1999 Figure 5 Ru
35、bber buffersBS3475:1976 BSI 12-1999 Publications referred to This standard makes reference to the following BritishStandards: BS381C, Specification for colours for identification, coding and special purposes. BS1224, Electroplated coatings of nickel and chromium. BS1449, Steel plate, sheet and strip
36、. BS1449-2, Stainless and heat resisting steel plate, sheet and strip. BS1823, Stainless steel hollow-ware for use in hospital operating-theatres and wards. BS2050, Electrical resistance of conductive and anti-static products made from flexible polymeric material. BS2099, Castors. BS2099-1, Castors
37、for hospital equipment for ward and theatre use. BS2901, Filler rods and wire for gas-shielded arc welding. BS2901-2, Austenitic stainless steels. BS3014, “As welded” and cold drawn welded austenitic stainless steel tubes for mechanical, structural and general engineering purposes. BS3019, General r
38、ecommendations for manual inert-gas tungsten-arc welding. BS3019-2, Austenitic stainless and heat-resisting steels. BS 3475:1976 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK
39、 view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve
40、the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel:02089969000. Fax:020899674
41、00. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel:02089969001. Fa
42、x:02089967001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as BritishStandards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and internati
43、onal standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel:02089967111. Fax:02089967048. Subscribing members of BSI are kept up
44、 to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel:02089967002. Fax:02089967001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright,
45、in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise wit
46、hout prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel:02089967070.
