1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21982-6 SANS 7840:2008 Edition 1 ISO 7840:2004 Edition 3SOUTH AFRICAN NATIONAL STANDARD Small craft Fire-resistant fuel hoses This nationa
4、l standard is the identical implementation of ISO 7840:2004, and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.c
5、o.za SABS This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 7840:2008 Edition 1 ISO 7840:2004 Edition 3 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS TC 188, Smal
6、l craft, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in September 2008. This standard may only be used and printed by approved subscription and freemailing clients of the SABS. Reference number IS
7、O 7840:2004(E) ISO 2004INTERNATIONAL STANDARD ISO 7840 Third edition 2004-02-15 Small craft Fire-resistant fuel hoses Petits navires Tuyaux carburant souples rsistant au feu SANS 7840:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.ISO 7840
8、:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes 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 th
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11、w. ISO 2004 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 ISOs member body i
12、n 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 copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2004 All rights reservedSANS 7840:2008This standard may only be used and printed by approved sub
13、scription and freemailing clients of the SABS.ISO 7840:2004(E) ISO 2004 All rights reserved iiiContents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 General requirements . 1 4 Nominal bore . 2 5 Physical tests on finished hose 2 5.1 Bursting pressure . 2 5.2 Vacuum-collapse test . 3 5.3 V
14、olume change In liquid C . 3 5.4 Mass reduction In liquid C . 3 5.5 Fire resistance. 3 5.6 Effect of ozone 3 5.7 Fuel permeation 3 5.8 Cold-flex test . 4 5.9 Abrasion test: 38 mm and larger fuel-fill hose with helical wire imbedded reinforcement. 4 5.10 Dry heat resistance . 4 5.11 Oil resistance te
15、st . 4 5.12 Adhesion test 4 6 Marking. 4 Annex A (normative) Fire test . 6 Annex B (normative) Fuel permeation test (or equivalent test method) 8 SANS 7840:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.ISO 7840:2004(E) iv ISO 2004 All rig
16、hts 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 f
17、or 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
18、 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 a
19、re 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
20、responsible for identifying any or all such patent rights. ISO 7840 was prepared by Technical Committee ISO/TC 188, Small craft. This third edition cancels and replaces the second edition (ISO 7840:1994), which has been technically revised. SANS 7840:2008This standard may only be used and printed by
21、 approved subscription and freemailing clients of the SABS.INTERNATIONAL STANDARD ISO 7840:2004(E) ISO 2004 All rights reserved 1Small craft Fire-resistant fuel hoses 1 Scope This International Standard specifies general requirements and physical tests for fire-resistant hoses for conveying petrol a
22、nd diesel oil, designed for a working pressure not exceeding 0,34 MPa for hoses with nominal bore up to and including 10 mm and 0,25 MPa for hoses with larger bore in craft of hull length up to 24 m. It applies to hoses for small craft with permanently installed fuel systems. It does not apply to ho
23、ses entirely within the splash well at the stern of the craft connected directly to an outboard engine. Specifications for non-fire-resistant fuel hoses are contained in ISO 8469:1994, Small craft Non-fire- resistant fuel hoses. 2 Normative references The following referenced documents are indispens
24、able 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 3:1973, Preferred numbers Series of preferred numbers ISO 1307:1992, Rubber and plastics hose
25、s for general-purpose industrial applications Bore diameters and tolerances, and tolerances on length ISO 1402:1994, Rubber and plastics hoses and hose assemblies Hydrostatic testing ISO 1817:1999, Rubber, vulcanized Determination of the effect of liquids ISO 7233: 1) , Rubber and plastics hoses and
26、 hose assemblies Determination of suction resistance ISO 7326:1991, Rubber and plastics hoses Assessment of ozone resistance under static conditions ISO 10088:2001, Small craft Permanently Installed fuel systems and fixed fuel tanks 3 General requirements Hoses complying with this International Stan
27、dard shall present a non-porous, smooth inner surface, free from defects and chemical contaminants. Hoses shall demonstrate suitability for marine use by complying with the requirements of the tests in Clause 5.They shall be marked according to Clause 6. 1) To be published. (Revision of ISO 7233:199
28、1) SANS 7840:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.ISO 7840:2004(E) 2 ISO 2004 All rights reserved4 Nominal bore Table 1 gives some of the inner diameters based on series R 10 of ISO 3. Tolerances shall conform to ISO 1307 or the
29、values given in Table 1. Table 1 Inner diameters and tolerances Dimensions in millimetres Inner diameter, d Tolerance 3,2 4 5 0,5 6,3 7 8 9,5 10 12,5 16 19 20 0,75 25 31,5 38 1,25 40 50 63 1,5 5 Physical tests on finished hose New specimens shall be used for each of the tests below. 5.1 Bursting pre
30、ssure Fill three hoses or test pieces from the hoses with Test Liquid C as specified in ISO 1817:1999 and store them for 7 days in air at an ambient temperature of 23 C 2 C. Empty the liquid out and fill the hoses or test pieces with cold water; subject them to bursting pressure as described in ISO
31、1402. The bursting pressure shall be at least 1,4 MPa for hoses of 10 mm or smaller inner diameter and 1,00 MPa for hoses with a larger bore. SANS 7840:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.ISO 7840:2004(E) ISO 2004 All rights res
32、erved 35.2 Vacuum-collapse test Carry out the test In accordance with ISO 7233: 1) , method A using the test conditions specified in Table 2. Table 2 Pressure conditions for the vacuum collapse test Inner diameter, d Vacuum mm kPa d u 10 80 10 25 No test required The time shall be 60 s and the diame
33、ter of the sphere 0,8 d (inner diameter). 5.3 Volume change In liquid C Determine the change in volume of the hose (tube and cover) by the procedure described in ISO 1817. Place the test pieces in liquid C at an ambient temperature of 23 C 2 C for 70 h 2 h. If the hose is made of a homogeneous compo
34、und (with or without reinforcement), the swelling in liquid C shall not exceed 35 % by volume, as measured by displacement in water. For hose with an inner layer of fuel- resistant material and a cover of another material, mainly intended for weather and ozone resistance, the increase in volume in l
35、iquid C shall not exceed 35 % for the tube and 120 % for the cover. 5.4 Mass reduction In liquid C Determine the reduction in mass of the inner layer by the procedure described in ISO 1817. Fill three hoses or test pieces from the hoses with Test Liquid C, as specified in ISO 1817:1999, and store th
36、em for 7 days in air at an ambient temperature of 23 C 2 C. The reduction in mass of the inner layer shall not exceed 8 % of the initial mass of the test pieces. NOTE A reduction in mass of 8 % corresponds to a decrease in volume of approximately 10 %. 5.5 Fire resistance Test the hose in accordance
37、 with the method described in Annex A. 5.6 Effect of ozone The hose shall be tested as described in ISO 7326:1991, Method 1. The sample shall show no visible cracks at 7 magnification. 5.7 Fuel permeation A permeation rate shall be tested. When tested according to the method described in Annex B or
38、equivalent test method, the hoses shall be classified in the following way and marked in accordance with Clause 6: Type 1: shall be hoses with a permeation rate of 100 g/m 2or less per 24 h. Type 2: shall be hoses with a permeation rate of 300 g/m 2or less per 24h. SANS 7840:2008This standard may on
39、ly be used and printed by approved subscription and freemailing clients of the SABS.ISO 7840:2004(E) 4 ISO 2004 All rights reserved5.8 Cold-flex test For straight hose of 19 mm inside diameter and under, condition hose samples for 5 h at 20 C 2 C. Flex in the cold chamber through 180 from the centre
40、line to a diameter of 10 times the maximum outside diameter of the hose. The flexing shall take place within 4 s and the hose shall not fracture or show any cracks, checks or break in the tube or cover. For straight hose of larger than 19 mm inside diameter and all preformed hose, prepare three spec
41、imens 100 6 mm from the whole hose wall. Cold condition as above in an unrestrained loop positioned between two jaws 50 mm wide and 64 mm apart. While in the cold chamber, bring the jaws together rapidly until they are 25 mm apart. The specimens shall not fracture or show any cracks, checks or break
42、s. 5.9 Abrasion test: 38 mm and larger fuel-fill hose with helical wire imbedded reinforcement Hose samples of 38 mm bore shall be selected for the test. Larger bore hose sizes to be qualified by the test shall not have a cover thickness or construction less than those of the test samples. Three ide
43、ntical 38 mm bore hose samples shall be tested. Condition hose for at least 24 h at 23 C 2 C and 50 % 5 % relative humidity. The test hose shall be mandrel- (core-) supported and rotated at a constant speed of 80 r/min 2 r/min. Subject hose to a laterally moving abrasive surface, i.e. 80 grit alumin
44、ium oxide (Al 2 O 3 ) emery cloth, parallel to the longitudinal axis of the hose. The abrasive surface shall be (25 5) mm (75 5) mm affixed to a hard surface which will cycle back and forth 75 mm 5 mm in each direction while loaded with a constant normal force of 45 5 N. One test cycle shall equal o
45、ne 360 rotation of the outside diameter of the hose and one back and forth movement of the abrasive surface. After 1000 cycles, the three test samples shall have no helical wire reinforcement exposed at the point of contact with the abrasive surface. 5.10 Dry heat resistance After heat aging for 70
46、h at 100 C 2 C, specimens taken from the cover material shall not have a reduction in tensile strength of more than 20 % of the tested value or a reduction in elongation of more than 50 %. 5.11 Oil resistance test After 70 h immersion in reference oil ISO 1817:1999, Oil number 3 at 100 C 2 C specime
47、ns taken from the tube shall not have a reduction of tensile strength or elongation exceeding 40 % of the tested value, or a volumetric change of 5 to + 25 %. Specimens taken from the cover material shall not have a volumetric change outside the range of 0 to + 100 %. 5.12 Adhesion test The force re
48、quired to separate a 25 mm width sample of bonded adjacent layers, such as the tube and cover of hose material, by tensile force on partially separated layers applied in opposite directions, at 23 C 2 C, shall be not less than 27 N. 6 Marking To comply with this International Standard, a hose shall
49、be marked at least every 0,3 m with the name or trademark of the manufacturer or supplier, the last two figures of the year of manufacture, inner diameter, mm, “ISO 7840 - A1” or “ISO 7840 - A2”. SANS 7840:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.ISO 7840:2004(E) ISO 2004 All rights reserved 5NOTE “A” is used to designate a fire resistant type of fuel hose. “1” is used to desig
