BS EN ISO 8331-2016 pdf free download.Rubber and plastics hoses and hose assemblies — Guidelines for selection, storage, use and maintenance (ISO 8331:2016)
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.
4.2.12 Issue from storage Care should be taken to ensure that articles issued from stock are in their correct condition and correspond to their intended application. Identification 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.
4.2.13 Return to storage
Before being returned to storage, 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 articles should be examined to establish their suitability for continued use.
4.3 Use and maintenance
4.3.1 Handling Hoses and hose assemblies should 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.
4.3.2 Pressure Articles should not be subjected to pressures, including surge pressures, in excess of the specified maximum working pressure.
4.3.3 Temperature Articles should not be used at temperatures, either conveyed-product temperatures or environmental temperatures, outside the range specified or recommended by the manufacturer.
4.3.4 Products conveyed Hoses and hose assemblies should only be used for conveying 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 leakage should be taken and it is recommended that, when not in use, hoses and hose assemblies should not remain filled.
4.3.5 Environment 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 environment, or if unusual or variable conditions are experienced, the manufacturer should be consulted.
4.3.6 Bending 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 product 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.
4.3.7 Torsional stress Hoses and hose assemblies are not designed to operate in torsion. Installation should be performed so that the relative motions of machine components produce bending of the hose and eliminate twisting.BS EN ISO 8331 pdf download.