DIN 7080-2005 Pressure resistant circular sight glasses of borosilicate glass without limitation in the range of low temperature《低温范围内无限制的硼硅酸盐玻璃制抗压圆形视孔玻璃》.pdf
《DIN 7080-2005 Pressure resistant circular sight glasses of borosilicate glass without limitation in the range of low temperature《低温范围内无限制的硼硅酸盐玻璃制抗压圆形视孔玻璃》.pdf》由会员分享,可在线阅读,更多相关《DIN 7080-2005 Pressure resistant circular sight glasses of borosilicate glass without limitation in the range of low temperature《低温范围内无限制的硼硅酸盐玻璃制抗压圆形视孔玻璃》.pdf(14页珍藏版)》请在麦多课文档分享上搜索。
1、May 2005DEUTSCHE NORM English price group 10No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 71.120.10!$H7“1379420ww
2、w.din.deDDIN 7080Circular borosilicate sight glasses with unlimited pressure resistance atlow temperaturesRunde Schauglasplatten aus Borosilicatglas fr Druckbeanspruchung ohne Begrenzungim TieftemperaturbereichSupersedesDIN 7080:1999-05www.beuth.deDocument comprises 14 pages Translation by DIN-Sprac
3、hendienst. In case of doubt, the German-language original should be consulted as the authoritative text. DIN 7080:2005-05 2 Foreword This standard has been prepared by Technical Committee FNCA AA 1 Anlagenteile of the Normenausschuss Chemischer Apparatebau (Process Engineering Standards Committee).
4、Annexes A and B are informative. Amendments This standard differs from DIN 7080:1999-05 as follows: a) Subclause 4.5.2 has been corrected in accordance with Corrigendum DIN 7080:1999-05. b) Subclause 4.5.4 has been corrected. c) “Permissible working pressure” has been replaced by “maximum permissibl
5、e pressure”. d) The standard has been editorially revised. Previous editions DIN 7080: 1943x-10, 1965-07, 1975-09, 1996-02, 1999-05 1 Scope This standard applies to thermally prestressed circular borosilicate sight glasses that can be continuously subjected on one side to liquid or gas pressures at
6、up to 280 C and, in exceptional circumstances, to 300 C (cf. subclause 4.3.2). The sight glasses can only be used at pressures and temperatures up to those specified if they are installed as described in clause 10. There is no limit on the use of sight glasses conforming to this standard at temperat
7、ures below ambient temperature. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) app
8、lies. DIN 28120, Circular sight glasses with case in main power connection DIN 28121, Circular sight glasses with case in metal to metal contact type flanged joint DIN ISO 695, Glass Resistance to attack by a boiling aqueous solution of mixed alkali Method of test and classification DIN ISO 718, Lab
9、oratory glassware Thermal shock and thermal shock endurance Test methods DIN ISO 719, Glass Hydrolytic resistance of glass grains at 98 C Method of test and classification DIN ISO 1776, Glass Resistance to attack by hydrochloric acid at 100 C Flame emission or flame atomic absorption spectrometric m
10、ethod DIN ISO 2859-1, Sampling procedures for inspection by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection DIN ISO 7991, Glass Determination of coefficient of mean linear thermal expansion DIN 7080:2005-05 3 3 Dimensions and designation Dimens
11、ions in millimetres Key 1 Seal a Chamfered edge (cf. Table 1) Figure 1 Sight glass Designation of a circular sight glass having a diameter, d1, of 100 mm and a thickness, s, of 15 mm: Sight glass DIN 7080 100 15 The relationship between maximum permissible pressure and dimensions is shown in Table 1
12、. Table 1 Dimensions Maximum permissible pressure, in bar 8 10 16 25 40 50 Diameter d1Diameter d2Thickness s 45 32 10 12 (50) 35 10 12 (60) 45 10 12 15 63 48 10 12 15 80 65 12 15 20 100 80 15 20 25 125 100 15 20 25 150 125 20 25 30 175 150 20 25a30a 200 175 20a25 30 250 225 25a30 Only applicable to
13、containers made of enamelled steel 135 110 25 265 240 30 Diameters in brackets are not for use in new designs. aThe safety factor for these sizes is between 4,5 and 4,9. DIN 7080:2005-05 4 4 Material 4.1 General The material used shall be thermally prestressed borosilicate glass conforming to the re
14、quirements specified in subclauses 4.2 to 4.5. 4.2 Mechanical strength Unprestressed glass having a (tested) flexural tensile strength of about 40 N/mm2shall be thermally prestressed until the compressive prestress at the surface is not less than 100 N/mm2(see Annex A.1). 4.3 Thermal properties 4.3.
15、1 Mean coefficient of linear thermal expansion The mean coefficient of linear thermal expansion, (20 C, 300 C), determined as specified in DIN ISO 7991 shall not exceed 5,0 106K1. 4.3.2 Permissible working temperature The continuous working temperature of the sight glass shall normally not exceed 28
16、0 C. It should be borne in mind that, at temperatures above 280 C, a permanent decrease in the prestress is likely to occur (see Annex B 1). For example, at a working temperature of 300 C, the prestress will probably be only 90 % of the initial value after the sight glass has been in service for 300
17、 hours. However, use at temperatures between 280 C and 300 C is permissible provided suitable precautions are taken, such as protecting the sight glass with mica and restricting the cumulative working time above 280 C to a maximum of 300 hours. 4.3.3 Thermal shock resistance The thermal shock resist
18、ance of the sight glass determined as specified in DIN ISO 718 and subclause 7.4 shall be 230 C. 4.4 Chemical resistance The chemical resistance of borosilicate glass shall comply with the following: hydrolytic resistance class HBG 1 as in DIN ISO 719; acid resistance class as in DIN ISO 1776 not ex
19、ceeding 100 g Na2O/100 cm2; alkali resistance class A2 as in DIN ISO 695 (see also Annex A.2). DIN 7080:2005-05 5 4.5 Material defects 4.5.1 General Bubbles, striations, bands of striations, viscous knots and crystalline inclusions shall not exceed the values given below and shall not affect the mec
20、hanical strength or have a technically significant effect on transparency (see Annex B, 2). 4.5.2 Bubbles The diameter of spherical bubbles in the glass and the average of the length and width of oval ones shall not exceed 2 mm. Tapered bubbles are not permitted. The number of bubbles in a given siz
21、e range shall be within the limits specified in Table 2. Table 2 Permissible number of bubbles Bubble diameter, d3Permissible number of bubbles d3200 10 s 20 s 20 0,5 0,8 1 5,025,0+8,04,0+6.2 Shape tolerances and positional tolerances The maximum allowable deviations of the faces from flatness and p
22、arallelism are shown in Table 4. Table 4 Flatness and parallelism Dimensions in millimetres Diameter d1d1 100 100 200 Flatness e 0,05 0,08 0,12 0,15 Parallelism p 0,2 0,25 0,3 DIN 7080:2005-05 7 6.3 Edge tolerances The edge finishes resulting from the chamfer are shown in Table 5. Table 5 Edge toler
23、ances Dimensions in millimetres Diameter d1Edge dimensions 100 0,13,0 100 5,13,07 Testing 7.1 General The manufacturer shall test the sight glass for conformity with the specifications given in clauses 3, 4, 5 and 6 and shall confirm that the requirements have been fulfilled by marking the sight gla
24、ss as specified in clause 8. 7.2 Qualitative prestress assessment by photoelastic analysis Every sight glass shall be tested by viewing it perpendicularly to the flat glass surface. Several clearly distinguishable circular lines closed upon themselves (isochromatics) shall be visible at the rim (see
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