NBN EN 10305-4:2011

This European Standard specifies the technical delivery conditions for seamless cold drawn steel tubes of circular cross section used in hydraulic and pneumatic power systems with specified outside diameter D inferior or equal to 80 mm.
Tubes according to this document are characterised by having precisely defined tolerances on dimensions and a specified maximum surface roughness.
The allowed pressure rates and upper temperatures are the responsibility of the customer in accordance with the state of the art and in application of the safety coefficients specified in the applicable regulations, codes or standards. Concerning the lower temperature range applicability the impact energy requirements are given at 0° C.
NOTE Once this standard is published in the Official Journal of the European Union (OJEU) under Directive 97/ 23/ EC, presumption of conformity to the Essential Safety Requirements (ESRs) of Directive 97/ 23/ EC is limited to technical data of materials in this standard and does not presume adequacy of the material to a specific item of equipment. Consequently, the assessment of the technical data stated in this material standard against the design requirements of this specific item of equipment to verify that the ESRs of the Pressure Equipment Directive are satisfied, needs to be done.