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Standards Development
This document/British Standard specifies the requirements for circular non-alloy steel tubes suitable for welding and threading and provides a number of options for the finish of tube ends and coatings. This document covers tubes of specified outside diameter 10,2 mm to 165,1 mm (thread size 1/8 to 6) in two series, medium and heavy, and three types of designated thicknesses. NOTE: Tubes manufactured according to this document can be used for the conveyance of fluids as well as for other applications.
The revision of EN 10255 was formally cancelled by CEN (agreed by CEN/BT C160/2021) due to aspects related to the compliance with the Construction Products Regulation. More recently, the systematic review vote was launched, and CEN/TC 459/SC 10 confirmed the standard for another five years with 12 positive votes and the negative vote from the UK (Decision C4/2023 on 2023-03-04). Therefore, there is no expectation that this European standard may start its revision soon. Meanwhile, this standard which the basis for the CE marking under the Construction Products Regulation (and for the UKCA marking after BREXIT) is still very relevant for the UK industry and needs to be updated to the state of the art and to the pre-BREXIT Construction Products (Amendment etc.) (EU Exit) Regulations 2019 N0 465 (CPR). In particular: State of the art:
- Other joining methods used by the construction industry for many years (e.g., grooved fittings and compression ends) to be added in addition to welding and
threading
- Maximum outside diameter to be extended from 6 to 12 inch (from 165.1 mm to 329.9 mm)
CPR compliance
- Normative references to be updated and dated, for legal certainty.
- Performance based assessment approach to be introduced, removing thresholds as it is the case of the yield strength currently limited to 195 MPa.
- Safety critical essential characteristics to be added in line with the original
European Commission Mandate M/131 (see annex) such as resistance to high temperature, weldability and impact resistance. These are fundamental for
guaranteeing the safety of the buildings in which these products are installed.
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