1、 STD-BSI BS EN 1575-ENGL 1977 m 1b24bb7 Ob30773 480 M BRITISH STANDARD Pressure equipment made from borosilicate glass 3.3 - General rules for design, manufacture and testing * * v1 The European Standard EN 1595 : 1997 has the status of a British Standard ICs 71.120.10 81.040.30 NO COPYING WITHOUT B
2、SI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 1595 : 1997 - STD-BSI BS EN 1575-ENGL 1797 1b24bb7 Ob30774 317 = BS EN 1696 : 1997 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PSW13, Glass piping, upon which t
3、he following bodies were represented: British Glass Manufacturers Confederation Chemical Industries Association institution of Chemical Engineers Society of Glass Technology Coopted memberc “his British Standard, having been prepared under the direction of the Engineering Sector Board, was published
4、 under the authority of the Standards Board and comes into effect on 15 August 1997 O BSI 1997 Amendments issued since publication Amd-No- ID* I Te*affectd The foiiowing BSI references relate to the work on this standard Committee reference BEY13 Draft for comment 9Br11419 DC ISBN O 680 27961 8 I ST
5、D-BSI BS EN 1575-ENGL 1777 = 1b24bbS Ob30775 253 BS EN 1595 : 1997 Contents page Committees responsible Inside front cover Nationai foreword ii Foreword 2 Introduction 3 1 Scope 3 2 Normative references 3 3 Symbolsandunits 3 4 Material 6 Certification of quality characteristics 3 6 6 stsength charac
6、tristics for design 6 7 Designcalculations 8 Marking 6 7 9 inmectionandtestine 7 O BSI 1997 Tables 1 borosilicate giass 3.3 4 2 81.040.30 Descriptors: Glassware, pressure equipment, pressure vessels, glass tubes, borosilicate glass, design, characteristics, chemical resistance, quality, acceptabilit
7、y, computation, test, marking English veision Pressure eqyipment made hm bod cat glass 3.3 - General rules for design, manufactcire and ksting Eqnpement sous pression raliss en verre Druckgerate aus Borosilicatglas 3.3 - borosilicate 3.3 - Regles gnraies pour calculs, Allgemeine Grundsatze fur Berec
8、hnung, fabrication et essais Herstellung und pnifung This European Standard was approved by CEN on 199f512-12. CEN members are bound to comply with the CENKENELEC internai Regulations which stipuiak the conditions for giving this European Standard the status of a national standard Uptodate lists and
9、 bibliographical references concerning such national standards may be obtained on appidon to the Central Secretariat or to any CEN member. This European Standard exists in three officiai versions (English, French, German). A version in any other language made by translation under the responsibility
10、of a CEN member into its own ianguage and notified to the Central Secretariat has the same status as the official versions. CEN members are the nationai standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Itaiy, Luxembourg, Netherlands, Norway, Portugal
11、, Spain, Sweden, Switzerland and United Kingdom. without any altration. CEN European Commit - equipment made from borosilicate glass with another coefficient of thermai expansion. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publica
12、tions. These normative references are cited at the appropriate piaces in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision.
13、 For undated references, the latest edition of the publication referred to applies. Is0 695 IS0 719 IS0 720 IS0 1776 IS0 7884-8 IS0 7991 Glass - Resistance to attack by a boiling aqueous solution of mix - and if the distance between them is at least ten imes the diameter of the smaller inclusion. lp
14、en bubbles or bubbles which can be made to :ollapse easily are not permissible. Jlosed bubbles are permissible if the sum of their 3readth and length is no greater than 30 mm, the mdth is no greater than 10 mm and the bubbles hichess is less than 50 % of the wall thickness but loes not exceed 4 mm.
15、Knots from which craks extend into the surroundmg 6 Strength chamcteniseics for design 6.1 If the surface is ground and polished or sbnply ground, or if an initially fiamepolished undamaged surface is altered as a result of mechanical effects (e. g. scratches) when being utilized in the manner inten
16、ded, or if it is possible for it to be altered under service conditions, the permissible tensile stress shall be: K- 7 N.-z S- 6.2 If the fiamepolished surface produced during the hot-forming process has neither been subjected to further mechanical processing, nor has been altered as a consequence o
17、f mechanical effects (e.g. ScIiztChes), and if this fiamepolished state can be prevented from 1mdergchg any alteens during the planned service period through the application of a protective surface fmish My bonded to the glass, or through the adoption of other safety measures, the permjssiile tensil
18、e stress shaii be: = 10 N.m-2 S 6.3 The permissible compressive sxess shall be: = 100 N.mm-2 S 6.4 “he characteristics given in 6.1 to 6.3 already embrace a safety factors, for which no figure has been specified, which makes allowance for practical experience and for the theoretical finding relating
19、 to the strength behaviour of borosilicate glass 3.3 determined in experiments. Ehen with the applidon of a continuous maximum permissible load under unfavourable ambient conditions, a sufficiently low failure probabity is ensunxi 7 Design cdcnlations 7.1 Thermal wall stresses When there is a temper
20、ature difference between the outer and inner surfaces, stresses are established in the glass wall. The allowable temperature difference shall be stated by the manufadmer. 7.2 Design principles The required wall thickness shali be determined by appropriate calcuiation methods using the design chrtp.a
21、cteristcs given W chme 6. 7.3 Calculation of thermal wall stresses 7.3.1 “hemal stsesses in the wall vary in proportion with the temperature difference across the wall. Account shall be taken of thermd stresses perpendicular to the wail, observing 7.3.2 to 7.4. Thermai stresses parallel to the wall
22、do not need to be taken into consideration if, through the adoption of a suitable configuration or mode of operation, it is ensured that they cause the stresses in the wall to increase oniy slightly It is important that defornations of thermal origin are not inhibited by the manner in which the equi
23、pment is installed and the means employed for its restmint. 7.3.2 in the case of a hear temperature gradient perpendicular to the surface of the wall of the equipment, the sxess in axisymmetrical hollow bodies shall be calcdakd as follows: r*E- AT Stsessatthewallsuraceo,= (1 - VI where: OT is the te
24、nsile stress at the colder surface and also the compressive stress at the hotter surface. 7.3.3 With a non-linear temperature gradient, e.g. during the heating and cooling of glass components, q can assume larger values depending on the rate of temperahut variation, and may increase to a maximum of
25、twice the above value. O BSI 1997 STDaBSI BS EN L575-ENGL 1777 Lb24bb7 Ob30783 32T 7.4 Superposition of stresses of thermal and mechanical origin if the stresses attributable to the service pressure are increased simultaneousiy by thermal wail stresses sl. in accordance with the equation given in 7.
26、3.2, then the Values: K K -winsteadof 3 shallbesubstitutedinthe S appropriate calculations. 8Ma.rkin.g 8.1 The glass component shail be marked permanently with the name of the manufacturer or processor, the type of glass or brand name, the maximum ailowable service pressure and the maximum ailowable
27、 service temperature Merence AT or A - year of manufacture; - seriai number or drawing number; - maximum ailowable service pressure; - maximum allowable service temperature, - maximum ailowable service temperame difference AT or A - volume. Page 7 EN 1696 : 1997 9 Inspection and testing 9.1 Inspecti
28、on Glass components shall be assessed for compliance with wall thickness requirement, visually inspected as to freedom of imperfections which can affect the mechanical strength and examined by means of Fax: 0181 996 7048. Subscribing members of BSI are kept up to date with standards developments and
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