ISO 2928 2003

Reference numberISO 2928:2003(E)©ISO 2003INTERNATIONAL STANDARD ISO2928Third edition2003-08-15Rubber hoses and hose assemblies for liquefied petroleum gas (LPG) in the liquid or gaseous phase and natural gas up to 25 bar (2,5 MPa) — Specification Tuyaux et flexibles en caoutchouc pour gaz de pétrole liquéfié (GPL) en phase liquide ou gazeuse et le gaz naturel jusqu à 25 bar (2,5 MPa) — Spécifications Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS--`,,`,-`-`,,`,,`,`,,`---ISO 2928:2003(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe s licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe s licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. © ISO 2003 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO s member body in the country of the requester. ISO copyright office Case postale 56 • CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii © ISO 2003 — All rights reservedCopyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS--`,,`,-`-`,,`,,`,`,,`---ISO 2928:2003(E) © ISO 2003 — All rights reserved iiiContents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Terms and definitions. 2 4 Classification. 2 5 Materials and construction 2 6 Dimensions 3 7 Physical properties . 5 8 Electrical resistance . 7 9 Frequency of testing. 7 10 Marking. 8 Annex A (normative) Flammability test 9 Annex B (normative) Frequency of testing for type approval and routine tests . 11 Annex C (informative) Recommended frequency of testing for production acceptance tests 12 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS--`,,`,-`-`,,`,,`,`,,`---ISO 2928:2003(E) iv © ISO 2003 — All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 2928 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 1, Hoses (rubber and plastics). This third edition cancels and replaces the second edition (ISO 2928:1986), which has been technically revised. Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS--`,,`,-`-`,,`,,`,`,,`---INTERNATIONAL STANDARD ISO 2928:2003(E)© ISO 2003 — All rights reserved 1Rubber hoses and hose assemblies for liquefied petroleum gas (LPG) in the liquid or gaseous phase and natural gas up to 25 bar (2,5 MPa) — Specification WARNING — Persons using this International Standard should be familiar with normal laboratory practice. This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate health and safety practices and to ensure compliance with any national regulatory conditions. 1 Scope This International Standard specifies requirements for rubber hoses and rubber hose assemblies used for the transfer of liquefied petroleum gas (LPG) in the liquid or gaseous phase and natural gas and designed for use at working pressures ranging from vacuum to a maximum of 25 bar (2,5 MPa) within the temperature range −30 °C to +70 °C or, for low-temperature hoses (designated -LT), within the temperature range −50 °C to +70 °C. 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) applies. ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties ISO 188:1998, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests ISO 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing ISO 1746, Rubber or plastics hoses and tubing — Bending tests ISO 1817, Rubber, vulcanized — Determination of the effect of liquids ISO 4649:2002, Rubber, vulcanized or thermoplastic — Determination of abrasion resistance using a rotating cylindrical drum device ISO 4671:1999, Rubber and plastics hoses and hose assemblies — Methods of measurement of dimensions ISO 4672:1997, Rubber and plastics hoses — Sub-ambient temperature flexibility tests ISO 7233, Rubber and plastics hoses and hose assemblies — Determination of suction resistance ISO 7326:1991, Rubber and plastics hoses — Assessment of ozone resistance under static conditions ISO 8031, Rubber and plastics hoses and hose assemblies — Determination of electrical resistance ISO 8033, Rubber and plastics hose — Determination of adhesion between components ISO 8330, Rubber and plastics hoses and hose assemblies — Vocabulary Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS--`,,`,-`-`,,`,,`,`,,`---ISO 2928:2003(E) 2 © ISO 2003 — All rights reserved3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 8330 apply. 4 Classification Hoses shall be one of the following types:  type D: delivery hose;  type D-LT: delivery hose, low-temperature;  type SD: suction and delivery hose, helix-reinforced;  type SD-LTR: suction and delivery hose, helix-reinforced, low-temperature (rough-bore).  type SD-LTS: suction and delivery hose, helix-reinforced, low-temperature (smooth-bore); All these types can be:  electrically bonded, in which case the hose is additionally designated and marked with the symbol M;  electrically conducting by virtue of a conducting rubber layer, in which case the hose is additionally designated and marked with the symbol Ω;  electrically discontinuous, incorporating a metallic wire connection to one end-fitting of the hose assembly only. 5 Materials and construction The hose shall consist of the following:  a lining of rubber resistant to n-pentane;  a reinforcement of layers of woven, braided or spirally wound textile material or braided or spirally wound wire;  an embedded helical reinforcement (types SD, SD-LTR and SD-LTS only);  two or more low-resistance electrical-bonding wires (for hoses designated M only);  an outer cover of rubber, resistant to abrasion and outdoor exposure, the cover being pricked to allow gas permeation;  an internal, non-embedded helical wire, suitable for use at −50 °C (type SD-LTR only). Assemblies shall incorporate metallic fittings attached to the hose by the assembler. Chlorinated materials shall not be used in contact with any stainless-steel materials. Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS--`,,`,-`-`,,`,,`,`,,`---ISO 2928:2003(E) © ISO 2003 — All rights reserved 36 Dimensions 6.1 Nominal bore, internal diameter, outside diameter, minimum bend radius For hoses without built-in couplings, and when measured in accordance with method A of ISO 4671:1999, the internal diameter and outside diameter and their tolerances shall conform to the values given in Table 1 or Table 2, depending on the type. For hoses with built-in couplings, the outside diameters of Table 1 and Table 2 shall not apply. When tested by the method described in ISO 1746, the value of the minimum bend radius shall conform to the values given in Table 1 or Table 2, depending on the type. Table 1 — Dimensions of hoses of types D and D-LT Nominal bore Internal diameter Tolerance Outside diameter Tolerance Design minimum bend radius amm mm mm mm mm 12 12,7 ± 0,5 22,7 ± 1,0 100 15 15 ± 0,5 25 ± 1,0 120 16 15,9 ± 0,5 25,9 ± 1,0 125 19 19 ± 0,5 31 ± 1,0 160 25 25 ± 0,5 38 ± 1,0 200 32 32 ± 0,5 45 ± 1,0 250 38 38 ± 0,5 52 ± 1,0 320 50 50 ± 0,6 66 ± 1,2 400 51 51 ± 0,6 67 ± 1,2 400 63 63 ± 0,6 81 ± 1,2 550 75 75 ± 0,6 93 ± 1,2 650 76 76 ± 0,6 94 ± 1,2 650 80 80 ± 0,6 98 ± 1,2 725 100 100 ± 1,6 120 ± 1,6 800 150 150 ± 2,0 174 ± 2,0 1 200 200 200 ± 2,0 224 ± 2,0 1 600 250 254 ± 2,0 — — 2 000 300 305 ± 2,0 — — 2 500 NOTE Nominal bores 250 and 300 apply to hoses with built-in couplings only. aThe design minimum bend radius is measured to the surface of the hose on the inside of the bend. Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS--`,,`,-`-`,,`,,`,`,,`---ISO 2928:2003(E) 4 © ISO 2003 — All rights reservedTable 2 — Dimensions of hoses of types SD and SD-LT Nominal bore Internal diameter Tolerance Outside diameter Tolerance Design minimum bend radius amm mm mm mm mm 12 12,7 ± 0,5 22,7 ± 1,0 90 15 15 ± 0,5 25 ± 1,0 95 16 15,9 ± 0,5 25,9 ± 1,0 95 19 19 ± 0,5 31 ± 1,0 100 25 25 ± 0,5 38 ± 1,0 150 32 32 ± 0,5 45 ± 1,0 200 38 38 ± 0,5 52 ± 1,0 280 50 50 ± 0,6 66 ± 1,2 350 51 51 ± 0,6 67 ± 1,2 350 63 63 ± 0,6 81 ± 1,2 480 75 75 ± 0,6 93 ± 1,2 550 76 76 ± 0,6 94 ± 1,2 550 80 80 ± 0,6 98 ± 1,2 680 100 100 ± 1,6 120 ± 1,6 720 150 150 ± 2,0 174 ± 2,0 1 000 200 200 ± 2,0 224 ± 2,0 1 400 250 254 ± 2,0 — — 1 750 300 305 ± 2,0 — — 2 100 NOTE Nominal bores 250 and 300 apply to hoses with built-in couplings only. aThe design minimum bend radius is measured to the surface of the hose on the inside of the bend. 6.2 Minimum thickness of lining and cover When measured in accordance with ISO 4671, the minimum thickness of both the lining and the cover of all hoses shall be 1,6 mm. Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS--`,,`,-`-`,,`,,`,`,,`---ISO 2928:2003(E) © ISO 2003 — All rights reserved 57 Physical properties 7.1 Compounds The physical properties of the compounds used for the lining and cover shall conform to the values given in Table 3, when determined by the methods listed in Table 3. Tests shall be carried out on samples taken either from the hose or from separately vulcanized sheets, vulcanized to the same cured state as the production hoses. Table 3 — Physical properties of compounds Property Unit Requirements Method of test Lining Cover Tensile strength (min.) MPa 10 10 ISO 37 (dumb-bell test piece) Elongation at break (min.) % 250 250 ISO 37 (dumb-bell test piece) Abrasion resistance (max.) mm3— 170 ISO 4649:2002, method A Ageing ISO 188:1998 (14 days at +70 °C, air-oven method) Hardness, change from original value (max.) IRHD +10 +10 ISO 48 Tensile strength, change from original value (max.) % ± 30 ± 30 ISO 37 Elongation at break, change from original value (max.) % −35 −35 ISO 37 Effect of liquids Increase in mass (max.) % +10 — ISO 1817, after 7 days immersed in n-pentane at +23 °C Variation in hardness (max.) IRHD +10/−3 — ISO 1817, after 7 days immersed in n-pentane at +23 °C and drying for 70 h at +40 °C Reduction in mass (max.) %