1、International Standard $ 6447 0 *liy# INTERNATIONAL ORGANIZATION FOR STANDARDIZATION*MEXRYHAPOIItlAR OPTAHWAUHR IlO CTAHJ.lAPTH3AtlHWORGANlSATlON INTERNATIONALE DE NORMALISATION Rubber seals - Joint rings used for gas supply pipes and fittings - Specification for material Caoutchouc - Garnitures d&a
2、nch&t& pour joints de canalisations de gaz - Sp&fications des matkriaux First edition - 1963-10-01 s UDC 621 X43.44 Ref. No. IS0 6447-1963 (EI p Descriptors : rubber, rubber products, sealing rings, pipelines, pipe joints, materials specifications, quality control. 3 2 Price based on 4 pages Copyrig
3、ht International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 mem
4、ber bodies). The work of developing International Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee has been authorized has the right to be represented on that committee. International organizations, governmental and
5、non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. International Standard IS0 8447 was developed b
6、y Technical Committee ISO/TC 45, Rubber and rubber products, and was circulated to the member bodies in June 1982. It has been approved by the member bodies of the following countries : Austria India Belgium Indonesia China Korea, Rep. of Czechoslovakia New Zealand Denmark Poland Egypt, Arab Rep. of
7、 Portugal France South Africa, Rep. of Spain Sri Lanka Sweden Turkey USA USSR The member bodies of the following countries expressed disapproval of the document on technical grounds : Netherlands United Kingdom 0 international Organization for Standardization, 1993 0 Printed in Switzerland Copyright
8、 International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-INTERNATIONAL STANDARD IS0 6447-1963 (E) Rubber seals - Joint rings used for gas supply pipes and fittings - Specification for mate
9、rial 1 Scope and field of application This international Standard specifies requirements for materials for vulcanized solid rubber sealing rings for gaseous fuel (manufactured and natural gas) supply pipes and fittings at operating temperatures up to 50 OC. Some general requirements for the finished
10、 joint rings are also given. If there are other requirements for the performance of the finished joint rings, particularly functional tests for the actual sealing system and related pipeline materials, they shall be specified additionally in national standards. This International Standard is applica
11、ble to joint rings for all pipeline materials including iron, steel, copper, plastics. In the case of composite sealing rings, depending on their design and after agreement between the manufacturer and the user, the materials used for any rubber parts not coming into contact with gaseous fuel shall
12、not have to comply with the re- quirement of 5.7 of this International Standard. Joint rings made from cellular rubber materials or with enclosed voids as part of their design are not included in this Inter- national Standard. 2 References IS0 37, Rubber, vulcanized - Determination of tensile stress
13、- strain properties. IS0 48, Vulcanized rubbers - Determination of hardness (Hardness between 30 and 85 IRHDI. IS0 188, Rubber, vulcanized - Accelerated ageing or heat- resistance tests. IS0 471, Rubber - Standard temperatures, humidities and times for the conditioning and testing of test pieces. IS
14、0 812, Rubber, vulcanized - Determination of brittleness tempera tore. 1) IS0 815, Rubber, vulcanized - Determination of compression set at normal and at high temperatures.2) IS0 1653, Rubber, vulcanized - Determination of compres- sion set at low temperatures.3) IS0 1817, Rubber, vulcanized - Deter
15、mination of the effect of liquids. 4) IS0 2230, Vulcanized rubbers - Guide to storage. IS0 3302, Rubber - Dimensional tolerances of solid moulded and extruded products. IS0 3384, Rubber, vulcanized - Determination of stress relax- ation in compression at normal and at elevated temperatures. IS0 4661
16、, Rubber - Preparation of test pieces. 1) At present at the stage of draft. (Revision of ISO/R 812-1968.) 2) At present at the stage of draft. (Revision of IS0 815-1972.) 3) At present at the stage of draft. (Revision of IS0 1653-1975.) 4) At present at the stage of draft. (Revision of IS0 1817-1975
17、.) Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 5447-1993 (El 3 Classification Five classes of material are specified (see tables 1 and 2). These correspond to pre
18、ferred nominal hardnesses of 50, 66, 70, 80 and 88 IRHD. If required, an intermediate nominal hardness dif- ferent from those indicated in the table may be used. 4 Materials 4.1 The materials shall be free of any substance which may have a deleterious effect on the fuel to be conveyed, or on the lif
19、e of the sealing ring, or on the pipe and fittings. 4.2 The requirements for materials of preferred nominal hard- ness 86 or 88 IRHD shall apply only when the material is directly participating in the sealing function. 5 General test requirements for material 5.1 Test pieces Unless otherwise specifi
20、ed, the tests shall be carried out at standard laboratory temperature in accordance with IS0 471. Test pieces shall be cut from the finished product in accor- dance with IS0 4661 and the other corresponding International Standards. If satisfactory test pieces cannot be prepared in ac- cordance with
21、the appropriate test method, they shall be taken from test slabs or sheets of suitable dimensions made from the same batch of the rubber mix used to make the rings, and vulcanized under conditions which are comparable to those used in production. 5.2 Hardness When determined by the “micro-test” meth
22、od specified in IS0 48, the hardness shall comply with the requirements given in table 1. If the dimensions of the ring allow, the “normal test” method specified in IS0 48 may be used, provided the “micro-test” method is used for reference purposes. For the same ring, or along the greatest length of
23、 an extruded profile cut to make a ring, hardness values shall not vary more than 4 IRHD from the low to the high readings noted. Each value shall be within the specified tolerances. NOTE - For the purposes of this International Standard, which re- quires hardness measurements up to 91 IRHD, the mic
24、ro-test method described in IS0 49 is considered satisfactory. 5.3 Tensile strength and elongation at break The tensile strength and elongation at break shall be deter- mined by the method described in IS0 37, using type 2 dumb- bell shaped test pieces. Other types of test pieces may be used if an a
25、greement is reached upon the relationship between the values obtained with type 2 dumb-bell shaped test pieces and those obtained on the proposed test pieces. The elongation at break shall comply with the requirements given in table I. The tensile strength shall comply with the requirements given in
26、 table 1 and shall be used for quality control purposes. 5.4 Compression set When determined by the method described in IS0 815 using the small test piece, the compression set after 70 +gh at standard laboratory temperature and after 22 g h at 70 OC shall comply with the requirements given in table
27、1. When determined by the method described in IS0 1653 using the small test piece and a recovery time of 30 + 3 min, the compression set after 70 z h at -5 OC, when measured at - 5 OC, shall comply with the requirements given in table I, When possible, test pieces for compression set shall be cut in
28、 the direction of compression of the ring in service. 5.5 Accelerated ageing in air When the test pieces required by 5.2 for the determination of hardness and by 5.3 for the determination of tensile strength and elongation at break are aged in air at 70 “C for 7 days by the oven method specified in
29、IS0 188, the changes in hard- ness, tensile strength and elongation at break shall comply with the requirements given in table 1. 5.6 Stress relaxation in compression When determined by method A specified in IS0 3384, using the small test piece and after applying mechanical and thermal conditioning,
30、 the stress relaxation in compression after 7 days at standard laboratory temperature shall comply with the re- quirements given in table 1. The test piece shall be cut as far as possible in the direction of compression of the ring. 5.7 Liquid B immersion 5.7.1 Volume change When determined by the m
31、ethod specified in IS0 1817, the volume change after an immersion of 7 days at standard laboratory temperature in liquid B and, in addition, followed by an air drying of 4 days at 70 OC, shall comply with the re- quirements given in table 1. For approval tests only, the volume change when immersed i
32、n liquid B shall not exceed the specified maximum value given in table 1 at any time throughout the duration of the 7 days immersion. 5.72 Hardness change When the test pieces described in 5.2 are tested in accordance with IS0 1817, the hardness change after an immersion of 7 days at standard labora
33、tory temperature in liquid B shall com- ply with the requirements of table 1. 2 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 6447-1963 (E) 6 Optional test requirem
34、ents for material Each of the following tests is optional and shall be carried out only if expressly specified by the purchaser. 6.1 Stress relaxation in compression When determined by method A specified in IS0 3384, using the small test piece and after applying mechanical and thermal conditioning,
35、the stress relaxation in compression after 90 days at standard laboratory temperature shall comply with the re- The test piece shall be cut as far as possible in the direction of compression of the ring. When this test is required, it shall be only a type approval test. 6.2 Low temperature brittlene
36、ss When tested by the method specified in IS0 812, using type A test pieces, at - 15 OC, -25 “C or -40 OC, the results shall comply with the requirements of table 2. The test temperature shall be specified by the user as a function of the service conditions of the joint seal, the conditions of quire
37、ments given in table 2. transportation or the temperature of installation. Table 1 - General requirements Property Unit Requirements 50 60 70 80 88 Preferred nominal hardness IRHD 60 60 70 80 86 Range of nominal hardness IRHD 46 to 55 66 to 65 68 to 75 76 to 64 65 to 91 Permissible tolerance on spec
38、ified nominal hard- ness IRHD +5 IL5 +5 +4 +3 Tensile strength, min. MPa 9 IO IO 10 IO Elongation at break, min. % 4co 300 200 160” 100” Compression set after 70 h at standard laboratory temperature, max. % IO IO IO 15” 15” after 22 h at 70 “C, max. % 20 20 20 20” 20” after 70 h at -5 “C, max. % 30
39、30 30 40” 40” Ageing - change from unaged values after 7 days in air at 70 OC hardness, max. IRHD f6 +6 f6 i6 &6 tensile strength, max. % -15 -15 -15 -15 -15 elongation at break, max. % -25to +I0 -25to +I0 -25to +I0 -3Oto +I0 -40to +I0 Stress relaxation in compression, max. after 7 days at standard
40、laboratory temperature* % 15 15 15 15” 15” Liquid B immersion after 7 days at standard laboratory temperature volume change, max. % +30 +I30 +3C +30 +30 hardness change, max. IRHD -16 -15 -15 -14 -12 Liquid B immersion and a subsequent 4 days at 70 OC air drying volume change, max. % -15 -12 -10 -10
41、 -10 l In specific cases and after an agreement between manufacturer and user, the tolerance on hardness may be fixed at f 3 lRHD. * Requirements for material of nominal hardness 60 or 66 IRHD shall be applied only when this material participates directly in the sealing function. l * It is recognize
42、d that values lower than the ones shown can be obtained. The intention is to reduce the limits once experience has been gathered. Table 2 - Optional requirements Property Unit Requirements 60 60 70 80 88 Stress relaxation in compression, max. after 90 days at standard laboratory temperature % 22 22
43、22 22” 22” Low temperature brittleness - temperature of test : - 15 OC, -25 XZ or -40 “C depending on the condi- tions of service or transportation of the joint rings No test pieces shall break * It is recognized that values lower than that shown can be obtained. The intention is to reduce the limit
44、s once experience has been gathered. * The requirement only applies when this material participates directly in the sealing function. 3 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license
45、 from IHS-,-,-IS0 8447-1983 (El 7 Quality control of material 7.1 Having regard to the hazards associated with the transportation of flammable and explosive fuels, attention is particularly drawn to the need for stringent quality control procedures. 7.2 It is the responsibility of the manufacturer t
46、o carry out control tests to confirm that the material for the rings complies with the appropriate requirements of this International Stan- dard. Records of these control tests shall be available to the pur- chaser upon request. 8 General requirements for finished joint rings 8.2 Dimensions and tole
47、rances Dimensions and tolerances shall be the subject of agreement between the interested parties. Tolerances shall be chosen from the appropriate classes in IS0 3302. 8.3 Storage and handling of rings At all stages between manufacture and use, the rings shall be stored in accordance with the recomm
48、endations of IS0 2230. The attention of users is drawn to the need to avoid cracking during storage and handling. If it is considered that risks of cracking exist, additional tests, appropriate to the situation in- volved, should be specified. 8.4 Marking Marking shall allow the identification of th
49、e manufacturer and also include the letter “G” to indicate the use of the ring. 8.1 Workmanship 8.5 Quality assurance 8.1.1 Workmanship shall be in accordance with good com- mercial practice. 8.1.2 The rings shall be free from porosity and shall not have surface defects or irregularities which could affect their function. Flash (sprue) shall be kept to a reasonable minimum. 8.5.1 Having regard to the hazards associated with the transportation of flammable and explosive fuels, atte
