BS EN ISO 8331 pdf free download

BS EN ISO 8331 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 he 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.BS EN ISO 8331  pdf download.