BS EN ISO 8331:2016 pdf – Rubber and plastics hoses and hose assemblies — Guidelines for selection, storage, use and maintenance (ISO 8331:2016).
1 Scope This document sets out recommendations designed to maintain rubber and plastics hoses and hose 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. NOTE It is intended that this document be used in conjunction with any applicable national statutory regulations. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 hose assemblies — Hydrostatic testing ISO 2230, Rubber products — Guidelines for storage ISO 8031, Rubber and plastics hoses and hose assemblies — Determination of electrical resistance and conductivity 3? Terms? and? definitions For the purposes of this document, the terms and definitions given in ISO 8330 apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — IEC Electropedia: available at http://www.electropedia.org/ — ISO Online browsing platform: available at http://www.iso.org/obp 4 General recommendations 4.1 Selection 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 requirements or for which the necessary information is not available, the hose manufacturer or trade association should be consulted.
4.2.3 Temperature The storage temperature should be below 25 °C and articles stored away from direct heat sources. Storage above 25 °C may shorten the life of the hose or hose assembly. Articles should not be subjected to temperatures over 50 °C or below –30 °C 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. 4.2.4 Humidity The relative humidity should not exceed 70 % or 65 % for polyurethane hose products. 4.2.5 Light 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 should be obscured with red, orange or white coverings. 4.2.6 Ozone 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 other equipment likely to cause sparks or electrical discharges. 4.2.7 Environment 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 effect on certain rubber compounds. 4.2.8 Sources 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 4.2.3.
4.2.9? Electric? and? magnetic? fields Storage areas 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. 4.2.10 Method of storing Articles should be stored in such a way that they are not subjected to 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 height 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. 4.2.11 Rodents Articles should be secure from attack by rodents and adequate protection should be provided if there are any risks.