BS EN ISO 8331:2014 pdf free
BS EN ISO 8331:2014 pdf free.Rubber and plastics hoses and hose assem blies
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 product standard or manufacturer whether a hose assembly is designed to withstand vibration.
Assembly of end fittings
Before proceeding with the assembly, determine the compatibility of 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 and 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.
After the attachment of the end fittings, it is recommended that the assembly undergo a hydrostatic proof test, to the specified proof pressure of the hose, to verify the hose fitting installation, i.e. freedom from leaks and no evidence of slipping between the fitting and the hose. In the absence of statutory regulations or other standards, carry out testing in accordance with ISO 1402.
When there are requirements regarding electrical properties of the hose or hose assembly, it is recommended that they be ascertained in accordance with ISO 8031. Continued compliance should be established by testing at regular intervals in use.
Hoses and hose assemblies used in fixed installations should, whenever possible, be supported by adequate clamping. Care should be taken to ensure that the clamps do not create excessive hose distortion during pressure/suction, i.e. dilation, change in length or expansion.BS EN ISO 8331 pdf download.
