BS EN ISO 3949:2018,Plastics hoses and hose assemblies – Textile-reinforced types for hydraulic applications – Specification.BS EN ISO 3949:2018 pdf free download.
BS EN ISO 3949:2018 specifies requirements for three types of textile-reinforced thermoplastics hose and hose assembly of nominal size from 3,2 to 25. Each type is divided into two classes dependent on electrical conductivity requirements.
This document does not include requirements for end fittings. It is limited to the performance of hoses and hose assemblies.
4 Classification
Three types of hose are specified, distinguished by their maximum working pressure:
a) Type R7: hoses with one or more layers of reinforcement;
b) Type R8: hoses with one or more layers of reinforcement, for operation at higher working pressures;
c) Type R18: hoses with one or more layers of reinforcement, 21,0 MPa (210 bar) working pressure based;
Each type of hose is divided into two classes according to its electrical properties;
1) Class 1, no electrical requirements;
2)Class 2, “non-conductive” (see 7.8).
5 Materials and construction
5.1 Hoses
Hoses shall consist of a seamless thermoplastic lining resistant to hydraulic fluids, with suitable textile yarn reinforcement and a thermoplastic cover resistant to hydraulic fluids, water and the weather.
For class 2 hoses, the cover shall not be perforated. The cover shall be orange (colour code RAL 2004).
5.2 Hose assemblies
Hose assemblies shall only be manufactured with those hose fittings whose functionality conforms to the requirements of 7.1, 7.4, 7.5 and, for class 2 only, 7.8.

Share on Facebook

Post on X

Follow us

Save