DIN 3535-5-1993 Sealants for gas supply sealing materials of rubber cork and synthetic fibres for gas armatures and gas appliances safety requirements tests《煤气供气密封件 煤气管件和煤气设备用橡胶、软木.pdf

1、UDC 62-762.4-036.074 :621.644.2: 662.76 :696.2:620.1:614.8 DEUTSCHE NORM Rubbedcork and rubbedcork synthetic fibre based gasket materials for use with gas valves, gas appliances and gas pipework Safety requirements and testing Decem ber 199: - DIN 3535 - Part 5 Dichtungen fr die Gasversorgung; Dicht

2、ungswerkstoffe aus Gummi, Kork und synthetischen Fasern fr Gasarmaturen, Gasgerte und Gasleitungen; sicherheits- technische Anforderungen, Prfung Supersedes April 1983 edition. In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comm

3、a has been used throughout as the decimal marker. This standard, in clauses 4 and 5, includes safety requirements within the meaning of the Gertesicherheitsgesetz (German Equipment Safety Law). This standard has been jointly prepared by DIN Deutsches Institut fr Normung e. !/ and DVG W Deutscher Ver

4、ein des Gas- und Wasserfaches e.!/ (German Society of Gas and Water Engineers). It has been included in the body of DVGW Codes of practice for gas. Dimensions in mm Contents Page 1 Scope . 1 2 Concepts . 2 3 Designation . 2 4 Safety requirements. . 2 4.1 Limit deviations for thickness. 2 4.2 Propert

5、ies on supply . 2 4.3 Properties after ageing . 2 4.4 Properties after swelling and redrying 3 5 Testing . 3 5.1 Test houses 3 5.2 Typesoftest . 3 1 Scope This standard specifies requirements for and methods of testing gasket materiais made from rubber bonded cork (type A) or rubber bonded corkkynth

6、etic fibre (type C) intended for use with gas valves, gas appliances and gas pipework in contact with gases conforming to DVG W-Arbeifs- blatt (DVGW Code of practice) G 260, with the exception of liquefied petroleum gas. Type A materials are rated for an allowable operating pres- sure of 1 bar and s

7、ervice temperatures of up to 100C, and type C materials for 4 bar and service temperatures of up to 150 OC. Designs which, as a result of continuing technical develop- ment, differ in some details from the specifications given here may, on application, be accepted as complying with the standard by a

8、 special committee. Such applications are to be addressed to the Normenausschu Gastechnik (Gas Tech- nology Standards Committee), Hauptstrae 71-79, D-65760 Eschborn. A test report issued by an impartial test house rec- ognized by the Normenausschu Gastechnik shall be sub- mitted together with the ap

9、plication. The test house shall Page 5.3 Sample material 3 5.4 Testing thickness 3 5.5 Testing of properties on supply . 3 5.8 Test report . 5 6 Marking 5 5.6 Testing of properties after ageing . 5 5.7 Testing of properties after swelling and redrying 5 Standards and other documents referred to . 6

10、Other relevant standards. 6 Explanatory notes 6 have carried out tests in accordance with the specifications of this standard. The special committee which considers the application and decides whether the gasket material in question conforms to the standard is made up as follows: a) the chairman of

11、Technical Committee Dichtungen und Schmierstoffe in Gasanlagen of the Normenausschu Gastechnik, and his deputy; b) the head of the test house commissioned to carry out the test; c) the chairman of the DVGWTechnical Committee Gas- gerte; d) the technical secretary of the Normenausschu Gas- technik. T

12、he decision as to whether gasket materials are to be recog- nized as conforming to this standard shall be based on whether the requirements specified here with regard to safety, perormance, etc. are satisfied in some other manner than provided for in the standard. Continued on pages 2 to 6. Beuth Ve

13、rlag GmbH, Berlin, has the exclusive right of sale for German Standards (DIN-Normen). 05.96 DIN 3535 Part 5 Engl. Price group 5 Sales No. O105 Page 2 DIN 3535 Part 5 Rubber bonded cork (A) Rubber bonded cork/ synthetic fibre (C) Recognition of conformity by the special committee is not effective unt

14、il it has been confirmed by the technical commit- tee responsible for DIN 3535 Part 5. An application for recognition of conformity with this standard is deemed to be a request for standardization. Recognition by the special committee signifies the acceptance of this request. Notification of such wi

15、ll be given in the relevant sec- tion of the DIN-Mitteilungen (DIN News), together with a note to the effect that a correspondingly revised edition of the standard is to be published under the abridged procedure. If the four-week period allowed for comments elapses without any objections being recei

16、ved, then the confirmation already given by the technical committee with respect to conformity with this standard shall count as approval of the revised edi- tion. The addresses of test houses may be obtained from: a) Normenausschu Gastechnik, Hauptstrae 71 -79, D-65760 Eschborn, b) DVG W Deutscher

17、Verein des Gas- und Wasserfaches e.V, Postfach 5240, E-65727 Eschborn. 2 Concepts 2.1 Rubber bonded cork gasket materials Rubber bonded cork gasket materials (type A) consist of a vulcanisate made from rubber and fine granule cork. The gasket properties are determined by the type of rubber used, the

18、 cork content and the particle size of the cork granules. A distinction is made between type 25 materials (low com- pressibility) and type 40 material (high compressibility). 1 +15% 4.2 Properties on supply Rubber bonded cork (A) Rubber bonded Express e d in cork/synthetic Type 25 Type 40 fibre (C)

19、YO 25 to 40 40 to 65 15 to 35 % 2 75 2 75 2 40 N /mm2 2 l,o 2 0,5 28 cm3/min a 0,05 5 0,05 5 0,05 I Testing as in subclause 5.5.1 5.5.1 5.5.2 5.5.3 Recovery Rubber bonded cork (A) 1 Expressed in -1 fiFFF 2.2 Rubber bonded corisynthetic fibre gasket materials Rubber bonded corkisynthetic fibre gasket

20、 materials (type C) consist of a vulcanizate made from rubber, fine granule cork and synthetic fibres. The gasket properties determined by the type of rubber used, the cork content and the particle size of the cork granules, as well as the proportion of fibres and their length. 3 Designation (A) : D

21、esignation of a type 25 rubber bonded cork gasket material Seal DIN 3535 - A 25 Testing asinsubclause 4 Safety requirements 4.1 Limit deviations for thickness Table 1 Tensile strength I Nlrnm2 I t l,o t 0,5 28 5.6.1 Compressive strength 4.3 Properties after ageing Table 3 N/mm* Not applicable. t 10

22、5.6.3 Rubber bonded cork Rubber bonded corki (A) synthetic fibre (C) Expressed in Change in thickness YO 53 Not applicable. Testing as in subclause 5.7 I Gas permeability I cm3/min I 5 0,05 I Not applicable. I 5.6.2 I I Chanae in mass I YO I Not aDDlicable. I 13 I 5.7 I DIN 3535 Part 5 Page 3 3 dial

23、 gauges equally spaced around circumference Ground N2 I O-ring Figure 1: Typical test apparatus for determining the gas permeability of type A gasket materials 5 Testing 5.1 Test houses Recognized test houses (cf. subclause 1.2) shall be commis- sioned to test gasket materials as specified in this s

24、tandard. 5.2 Types of test Cf. DVGW-Arbeitsblatt G 669. 5.3 Sample material For testing gaskets, the manufacturer shall provide the test house with eight sheets of gasket material, 2 mm thick each, of size A4 as specified in DIN 476 Part 1. 5.4 Testing thickness Thickness shall be tested as specifie

25、d in DIN 28 O91 Part 1. 5.5 Testing of properties on supply 5.5.1 Testing compressibility and recovery Compressibility and recovery shall be tested as specified in ASTM F 36-95, except that, in this case, specimens are con- ditioned for 48 hours prior to testing in a DIN 50 014 - 23/50-2 standard at

26、mosphere. 5.5.2 Testing tensile strength Tensile strength shall be determined in accordance with DIN 52 910, except that, in this case, specimens are condi- tioned for 48 hours prior to testing in a DIN 50 014 - 23/50-2 standard atmosphere. 5.5.3 Testing gas permeability 5.5.3.1 Type A gasket materi

27、als The gas permeability of type A gasket materials shall be determined by using a test apparatus as shown in figure 1. Prior to testing, specimens shall be conditioned for at least 48 hours in a DIN 50 014 - 23/50-2 standard atmosphere. Specimens shall have an annular form, with an outside diam- et

28、er of (752) mm, a width of (lo+:) mm and a thickness of (2 k 0,3) mm. The sealing faces of the compression plates (flanges) shall have been ground so that the ten point height of irregularities, R, does not exceed 2 pm. Once the test has been carried out, the specimens shall be checked for signs of

29、damage and their dimensions measured at three points 120 apart. Clean the sealing faces of the compression plates carefully, centre the specimen and compress type 25 matenals to 40%, and type 40 materials to 50% of their original thickness. Make sure specimens are uniformly loaded using the three di

30、al gauges on the test apparatus. After a period of ten minutes, during which the gas tightness of the measuring system is to be checked, introduce nitrogen gas at a pressure of 1 bar. Two hours after the specimen has been fitted in the apparatus, measure the volume of gas escaping over a 10-minute p

31、eriod using a gas burette with a detection limit of 0,Ol om3. The gas permeability is equal to the mean value, expressed in cm3/min, obtained from measurements taken for five spec- hens under standard conditions as specified in DIN 1343. Gas permeability shall be tested again once ageing has been co

32、mpleted (cf. subclause 5.6.2). 5.5.3.2 Type C gasket materials The gas permeability of type C gasket materials shall be determined by using a test apparatus as shown in figure 2. Prior to testing, specimens shall be conditioned for at least 48 hours in a DIN 50 014 - 23/50-2 standard atmosphere. Spe

33、cimens shall have an annular form, with an outside diam- eter of (90:) mm, a width of (20-A) mm and a thickness of (2 f 0,2) mm. The sealing faces of the compression plates (flanges) shall have been ground so that the ten point height of irregularities, R, does not exceed 2 pm. Once the test has bee

34、n carried out, the specimens shall be checked for signs of damage and their dimensions measured at three points 120 apart. Page 4 DIN 3535 Part 5 Clean the sealing faces of the compression plates Two hours after the specimen has been fitted in the appara- carefully, cover the specimen on both sides

35、with a 0,05mm tus, measure the volume of gas escaping over a 10-minute thick polyethylene film, centre the covered specimen and period using a gas burette with a detection limit of 0,Ol cm3. apply a uniform Surface Pressure of 10 fWnm2. After a Period The gas permeability is equal to the mean value,

36、 expressed of ten minutes, during which the gas tightness Of the measur- in cm3/min, obtained from measurements taken for five ing system is to be checked, introduce a nitrogen gas pres- specimens under standard conditions as specified in sure of 6 bar and maintain it for four minutes. DIN 1343. 14

37、I 1s 1 I 16- I I I 1 Nut 1 Cross bar Parallel pins Column Dial gauge 6 Spacer block 7 Knurled screw 8 Compression plate 9 Rubber packing 1 O Parallel pin 11 Compression plate 12 Load cell with 13 Parallel pin 14 Spacer block 15 Hydraulic press 16 Parallel pin 17 Baseplate ball-and-socket joint N2 pr

38、essure governor Figure 2: Typical test apparatus for determining the gas permeability of type C gasket materials DIN 3535 Part 5 Page 5 5.6 Testing properties after ageing 5.6.1 Testing of tensile strength Perform the tensile strength test as specified in subclause 5.5.2 using specimens which have b

39、een aged for (1683) hours in an oven (e.g. an oven conforming to DIN 50 O11 Part 2) at a temperature of (125 * 2)OC for type A and (1 75 k 2)“C for type C gasket materials. After ageing, specimens shall be conditioned for at least 48 hours prior to testing in a DIN 50014 - 23/50-2 standard atmospher

40、e. 5.6.2 Testing of gas permeability of type A gasket materials Following the gas permeability test as specified in subclause 5.5.3.1, place the compression plates enclosing the gasket in an oven (e.9. an oven conforming to DIN 50 O11 Part 2) for (168-g) hours at a temperature of (125 I2)OC. During

41、this period circulate air through the oven at a rate of approxi- mately 10cm3/min. Allow the oven to cool to 23C and repeat the gas permeability test as specified in subclause 5.5.3.1. 5.6.3 Testing of compressive creep strength of Type C gasket materials Determine the compressive creep strength as

42、specified in DIN 52 913 (accelerated test), except that, in this case, spec- imens are conditioned for at least 48 hours prior to testing in a DIN 50 014 - 23/50-2 standard atmosphere, the initial com- pressive stress being 25 N/mm* and the test temperature 5.7 Testing of properties after swelling a

43、nd redrying Testing shall be performed using three specimens, each measuring 30 mm x 30 mm x 2 mm. The test liquid for type A gasket materials shall be 160 cm3 of isooctane (fuel No. 1 as in DIN 53 521) and for type C materials, a 70 : 30 isooctane/ toluene mix (fuel No. 2 as in DIN 53 521). After s

44、pecimens have been conditioned for one hour at (100 $: 2)OC and cooled for one hour in a desiccator operat- (1 75 -I 2)OC. ing with calcium chloride, weigh them or measure their thick- ness as specified in subclause 5.4. Then place them in the liquid so that they are completely immersed and do not t

45、ouch each other or the walls of the vessel. Stir the test liquid at least once a day. After the specimens have been immersed for 7 days in closed test vessels at a temperature of (23 if: 2)OC, remove them from the liquid and allow them to dry for three hours in an oven with forced ventilation as spe

46、cified in DIN 50 O11 Part 2 at a temperature of (100 f 2) OC before drying them for one hour at a temperature of (18 to 28OC) in a desiccator operating with calcium chloride. Then, weigh them or meas- ure their thickness as specified in subclause 5.4. 5.8 Test report The test report shall make refer

47、ence to the test method used and provide information concerning the gasket material man- ufacturer and the client who commissioned the test. It shall also list the test results, comparing the nominal and actual values. The test results shall be summarized at the end of the test report. 6 Marking The

48、 packaging shall be legibly and indelibly marked with the following: a) manufacturers name or trademark; b) type designation; c) m-DVGW test mark and registered number. These details shall also be given in the manufacturers docu- mentation. Gasket materials shall be marked with the m-DVGW test mark

49、and registration number only if their compliance with the specifications of this standard has been certified by a rec- ognized test house in a test report and the manufacturer has been granted a registration number. Page 6 DIN 3535 Part 5 Standards and other documents referred to DIN 476 Part 1 Writing paper and certain classes of printed matter; trimmed sizes; A and B series (IS0 216 : 1975) DIN 1343 Reference conditions, standard conditions and standard volume; concepts and values DIN 28 O91 Part 1 Technical delivery conditions for gaskets made of asbestos-free ma