GW 10 Technical Standard 06/2018

GW 301 Technical Rule ‑ Standard 01/2021

Testing and Approval of Devices have been prepared by the project group ?Plastics in Gas and Water Supply Systems? on behalf of the Technical Committees on ?Gas Distribution?, ?Gas Transmission Lines? and ?Water Supply System Components?.

For the purposes of this Standard GW 381, the term ?minimum requirements? implies that further requirements canensue from technical rules and legal provisions and/or that the ordering party may stipulate further requirements,in particular in the presence of special features or needs for protection or other constraints. Theoptional criteria shall, without claiming to be exhaustive, be considered guidance for the ordering partywho shall decide on the need for further requirements.If a company consists of several units, this technical rule applies to the units in charge of undergroundconstruction and, without exception, to independent subsidiaries as well. A subsidiary shall be assumed tobe independent if, in effect, it actually controls most operations and/or if the head office of the company isunable to provide the supervision of the staff and the construction sites as required.

W 270 Technical Standard 11/2007

In accordance with ? 17 Par. 1 of the Drinking Water Ordinance of May 28, 2001, construction and other materials that when in contact with water release substances in concentrations higher than considered inevitable by the generally accepted engineering standards, or that directly or indirectly infringe the human health regulations stipulated by this Ordinance, or that alter the odour or flavour of the water, shall not be used for linings intended for use in contact with drinking water. The former Federal Health Agency has not issued any recommendations on cement‑bound and lining materials. As the physical behaviour of such materials differs from that of plastic materials, the Plastics and Drinking Water Recommendations (KTW recommendations) cannot be borrowed verbatim. This Code of Practice W 347 had to be reviewed in order to ensure that its contents reflect the state of the art and conform to the corresponding European Standards. This Code of Practice describes the requirements for and the testing of cement‑bound materials intended for use in drinking water supply systems.href= https://shop.wvgw.de/506643 >here.