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1、BRITISH STANDARD BS ISO 8331:2007 Rubber and plastics hoses and hose assemblies Guidelines for selection, storage, use and maintenance ICS 23.040.70 ? Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:30:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS ISO 8331
2、:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 September 2007 BSI 2007 ISBN 978 0 580 55788 0 National foreword This British Standard is the UK implementation of ISO 8331:2007. The UK participation in its preparation was entrusted t
3、o Technical Committee PRI/66, Rubber and plastics tubing, hoses and hose assemblies. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for i
4、ts correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:30:35 GMT+00:00 2007, Uncontrolled Copy, (c) BS
5、I INTERNATIONAL STANDARD ISO 8331 Second edition 2007-05-01 Reference number ISO 8331:2007(E) Rubber and plastics hoses and hose assemblies Guidelines for selection, storage, use and maintenance Tuyaux et flexibles en caoutchouc et en plastique Lignes directrices pour la slection, le stockage, lutil
6、isation et la maintenance BS ISO 8331:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:30:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:30:35 GMT+00:00 2007, Uncon
7、trolled Copy, (c) BSI iii Contents Page 1Scope 1 2Normative references 1 3General recommendations . 1 3.1Selection criteria . 1 3.2Storage conditions 2 3.3Use and maintenance . 4 4Additional recommendations for specific applications . 6 4.1General . 6 4.2Welding and gas-cutting hoses . 6 4.3Steam ho
8、ses 6 4.4Hoses for the conveyance of foodstuffs and drinking water 7 4.5Hoses for the conveyance of abrasive products 7 4.6Hoses for the conveyance of corrosive or aggressive products 7 4.7Hoses for the conveyance of flammable products . 7 4.8Automotive hoses . 8 4.9Hydraulic hoses . 8 4.10Fire-figh
9、ting hoses 8 4.11Oil-industry hoses and hose assemblies 10 Bibliography . 12 BS ISO 8331:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:30:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI iv Foreword ISO (the International Organization for Standardization)
10、 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 repre
11、sented 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
12、 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 Internationa
13、l 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 8331 was prepa
14、red by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 1, Hoses (rubber and plastics). This second edition cancels and replaces the first edition (ISO 8331:1991), which has been technically revised. BS ISO 8331:2007 Licensed Copy: London South Bank University, London South
15、 Bank University, Fri Oct 05 02:30:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 1 Rubber and plastics hoses and hose assemblies Guidelines for selection, storage, use and maintenance 1Scope This International Standard sets out recommendations designed to maintain rubber and plastics hoses and hose
16、assemblies, prior to use, in a condition as close as possible to the condition they were in when they were received and to obtain the expected service life. NOTEIt is intended that this International Standard be used in conjunction with any applicable national statutory regulations. 2Normative refer
17、ences 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 1402, Rubber and plastics hoses and hos
18、e assemblies Hydrostatic testing ISO 2230, Rubber products Guidelines for storage ISO 8031, Rubber and plastics hoses and hose assemblies Determination of electrical properties ISO/TR 17165-2, Hydraulic fluid power Hose assemblies Part 2: Recommended practices for hydraulic hose assemblies 3General
19、recommendations 3.1Selection criteria It is in the best interests of the user to select hoses or hose assemblies complying with national or international standards whenever such standards exist for the intended application. For applications outside the scope of such standards, needing special requir
20、ements or for which the necessary information is not available, the hose manufacturer or trade association should be consulted. The following points should be taken into consideration when selecting a hose or hose assembly for a specific application: a)Operational environment: ambient temperature; a
21、tmospheric conditions; contact with chemically aggressive liquids; contact with other deleterious media. BS ISO 8331:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:30:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 2 b)Media conveyed: liquid; gaseous; sol
22、ids; combinations of the above. c)Method of conveyance: pressure (including rate of flow); suction (including rate of flow); gravity (including rate of flow); assisted (mixture of solid/fluid, solid/air). d)Operating conditions: pressure and temperature of product conveyed; frequency of use. e)Insta
23、llation: degree of curvature (minimum bend radius); vibration of system; risk of damage by impact and abrasion; use of correct type of connection; type of movement and frequency. 3.2Storage conditions 3.2.1General During storage, especially for long periods, and when hoses and hose assemblies are ex
24、posed to certain adverse influences, the physical properties of hoses and hose assemblies can undergo changes that may result in them no longer having the optimum characteristics corresponding to their application when they are put into service. The storage conditions should be such as will offer ma
25、ximum protection and minimize deterioration of the articles during storage. 3.2.2Storage period The storage period should be kept to a minimum. Rotation of stock is therefore essential and the “first-in first-out” rule applied. For long-term storage, refer to ISO 2230 for storage time and conditions
26、. Items 3.2.3 to 3.2.8 are covered in ISO 2230 and are shown here for convenience only. 3.2.3Temperature The storage temperature should be below and articles stored away from direct heat sources. Storage above may shorten the life of the hose. Articles should not be subjected to temperatures over or
27、 below or to abnormal fluctuations in temperature during the storage period. See ISO 2230 for information on the effect of higher and lower temperatures on the storage time. 3.2.4Humidity The relative humidity should not exceed (see ISO 2230 for details). 25 C 25 C 50 C 30 C 70 % BS ISO 8331:2007 Li
28、censed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:30:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 3.2.5Light The articles should be stored in a dark place away from sunlight and strong artificial light. If the storage area has windows or glazed openings, they
29、should be obscured with red, orange or white coverings. 3.2.6Ozone Due to the harmful effect of ozone on rubber-based articles, storage areas should not contain equipment capable of generating ozone, for example mercury vapour lamps or tubes, high-voltage electrical equipment, electric motors or oth
30、er equipment likely to cause sparks or electrical discharges. 3.2.7Environment Articles should not be placed in contact with certain products or exposed to their vapours, particularly solvents, oils, greases, acids, disinfectants, etc. Some metals, such as copper, iron and manganese, have a harmful
31、effect on certain rubber compounds. 3.2.8Sources of heat Articles should not be stored in close proximity to heat sources. The distance between the articles and the heat sources should be sufficient to ensure compliance with the recommendations of 3.2.3. 3.2.9Electric and magnetic fields Storage are
32、as should not be in the vicinity of equipment that may generate electric or magnetic fields, as variations/fluctuations in such fields could induce currents in metallic joints, which in turn generate heat. 3.2.10Method of storing Articles should be stored in such a way that they are not subjected to
33、 excessive stress, elongation or deformation. Contact with sharp, pointed or abrasive objects or surfaces should be avoided, and storage racks should be provided whenever possible. Coiled hose or hose assemblies should be stored flat and preferably not stacked. When stacking is unavoidable, the heig
34、ht of the stack should be restricted so that the articles at the bottom do not suffer permanent deformation. The hanging of coils on pegs is not recommended. Hoses and hose assemblies supplied in straight lengths should be stored flat and unbent. End caps should be kept on hoses supplied with them.
35、3.2.11Rodents Articles should be secure from attack by rodents, and adequate protection should be provided if there are any risks. 3.2.12Issue from storage Care should be taken to ensure that articles issued from stock are in their correct condition and correspond to their intended application. Iden
36、tification of the different types in stock is essential. Hose assemblies which do not have permanent end fittings, i.e. those with clipping/clamping arrangements that can be adjusted, should be checked to ensure that the end fittings are secure. 3.2.13Return to storage Before being returned to stora
37、ge, articles which have been withdrawn from service should be drained of the substance they have been used to convey. Special care should be exercised with hoses that have been used to transport chemical, explosive, flammable or corrosive products. After cleaning and before return to storage, the ar
38、ticles should be examined to establish their suitability for continued use. BS ISO 8331:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:30:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 4 3.3Use and maintenance 3.3.1Handling Hoses and hose assemblies shou
39、ld always be handled with care. They should not be dragged over sharp or abrasive surfaces. They should not be subjected to kinking or flattening, for example by being run over by vehicles. 3.3.2Pressure Articles should not be subjected to pressures, including surge pressures, in excess of the speci
40、fied maximum working pressure. 3.3.3Temperature Articles are not be used at temperatures, either conveyed-product temperatures or environmental temperatures, outside the range specified or recommended by the manufacturer. 3.3.4Products conveyed Hoses and hose assemblies should only be used for conve
41、ying the products for which they are designed. If there is doubt regarding the suitability, the hose manufacturer should be consulted. When potentially dangerous (for example toxic, corrosive, explosive or flammable) products are being conveyed, precautions to minimize the effects of spillage due to
42、 leakage should be taken and it is recommended that, when not in use, hoses and hose assemblies should not remain filled. 3.3.5Environment Hoses and hose assemblies should not be used in environments other than those for which they were designed. If there is doubt regarding the suitability of the en
43、vironment, or if unusual or variable conditions are experienced, the manufacturer should be consulted. 3.3.6Bending radii Hoses and hose assemblies should not be used with bends less than the minimum bend radius specified or recommended by the manufacturer as this may restrict the passage of the pro
44、duct being conveyed or damage the hose assembly. Bends or kinking adjacent to end fittings should be avoided as continued bending in the same area may fatigue the reinforcement and lead to premature failure. 3.3.7Torsional stress Hoses and hose assemblies are not designed to operate in torsion. Inst
45、allation should be performed so that the relative motions of machine components produce bending of the hose and eliminate twisting. 3.3.8Tensile stress Only when hoses and hose assemblies are specially designed to do so may they be subjected to tensile stress. If the hose standard does not address s
46、uitability, then the hose manufacturer should be consulted. 3.3.9Vibration Vibration subjects hoses and hose assemblies to fatigue and heating, particularly around the connections, which can lead to premature failure. It is important to ascertain from the hose standard or manufacturer whether a hose
47、 assembly is designed to withstand vibration. BS ISO 8331:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:30:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 5 3.3.10Assembly of end fittings Before proceeding with the assembly, determine the compatibility o
48、f the fitting, the hose and the method of installation. In case of doubt, the hose manufacturer should be consulted. Fittings should be free from sharp edges, and the dimensions of hose inserts, ferrules, etc., should be such as to ensure an effective seal when correctly fitted. Swaging dimensions a
49、nd clip torque loads should be controlled, as insufficient or excessive swage dimensions will lead to premature failure of the assembly. To facilitate insertion of the fitting into the hose, the use of plain or soapy water is recommended. Do not use products containing oil, grease or solvents unless specified by the hose manufacturer in the assembly instructions. Care should be taken not to twist or kink the hose when inserting the fitting. 3.3.11Leaka