DIN 30670 04/2012 english version

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?.

This Technical Rule GW 350 in conjunction with DIN EN 12732 applies to the manufacture, testing and Evaluation of welds on steel pipelines and installations which serve to supply the general public with gas within the meaning of the Energy Industry Law (EnWG) or which are part of the associated energy installations on factory premises and in the area of operational gas use and which are to be operated with the gases ofthe 2nd gas family according to DVGW Standard G 260 or DVGW Standard G 262. It also applies to pipes in operation.For steel pipelines and installations for gases which do not comply with the provisions of the above DVGW standards, this technical rule may be applied mutatis mutandis taking into account the specific properties of the gases and any other existing provisions.

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.

This Code of Practice W 122 comprises all closing‑off structures for groundwater developments by vertical and horizontal filter wells. The new version incorporates operational issues insofar as they have an immediate effect on the requirements placed on the planning and construction of closing‑off structures.

W 303 Code of Practice 07/2005

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.

W 400‑1 Technical Rule Standard 02/2015

This Code of Practice W 402 describes how to collect and process reliable inventory, condition and environmental data about water distribution systems. Condition data notably include data on damages especially failures. These data shall serve mainly as a basis for systematic maintenance in accordance with DVGW W 400‑3 (A) and DVGW W 403 (M). Reliable failure statistics are of particular significance in this context as they serve to predict failure and failure rates and, consequently, determine the residual service lives. This Code of Practice supersedes Instruction Bulletin W 395 dated July 1998. The term ?asset? has been added here href= https://shop.wvgw.de/508041 >here. with DVGW G 402, which was produced at the same time.

This Guideline W 403 has been elaborated by the project group on ?Decision support for the rehabilitation of water pipe nets? of the Technical Committee on ?Water distribution operation and asset management? and serves as a decision support for the rehabilitation of water distribution systems. Professional circles have long used the term ?rehabilitation? to refer to the improvement of technical infrastructures. The publication in 1997 of DVGW guideline W 401, ?Decision support for the rehabilitation of water pipe nets?, instituted this term also into the national water supply. The condition of water distribution systems greatly influences the adequate quantity, necessary pressure and perfect quality of the drinking water supply. System condition‑based rehabilitation (condition‑based maintenance, cf. DVGW W 400‑3 (A)) serves to meet these requirements, at the same time improving the safety of supply and economic efficiency with a focus on the holistic approach of condition‑based, riskoriented maintenance. High‑quality supply and a good system condition in accordance with the DVGW Technical Rules can be ensured only if water leakage and system failure rates as well as the risks emanating from a water distribution system or affecting it remain at low levels. Low failure rates coinciding with high water losses do not indicate high‑quality supply but rather the presence of pipe damage not yet discovered because of e.g. unfavourable soil conditions. While increased inspection activities designed to reduce water losses may be a first step towards detecting and markedly reducing local water losses, system failure rates and risks as well as water losses may be kept at permanently low levels in the long term only if the pipe system is subjected to purposeful rehabilitation work. This holistic approach of condition and risk‑based maintenance is also important in the context of international standardisation. While the installation and development of pipeline systems is almost complete, the renaturisation and optimisation of networks has become necessary in many places in order to respond to changing societal conditions. Consequently, networks are subject not only to aging as well as wear and tear but also to adaptation processes, requiring water utilities to focus increasingly on the growing need to rehabilitate existing water distribution facilities. Rehabilitation will thus become essential in asset management, with ever more stringent requirements on the design and execution of rehabilitation. The evolution of the Technical Rules must pay heed to this fact, as reflected by the publication of the Technical Rules on Water distribution systems (TRWV, Water Distribution Facilities, W 400 series), in particular DVGW W 400‑3 (A) and DVGW W 490 (H) published in September 2006 and January 2007, respectively, which already describe fundamental rehabilitation principles. The inclusion of sophisticated technical processes in DVGW Codes of Practise GW 320 et seq. documents state‑of‑the‑art rehabilitation solutions for technical water infrastructure. DVGW Code of Practise W 402, ?Network and failure statistics?, which will supersede DVGW W 395 (M) and is currently available as a yellow paper only, will provide an important new basis for planning rehabilitation measures.This Guideline W 403 translates the above‑mentioned statistics and analyses into actual rehabilitation activities. The fact that it has been combined with W 402 illustrates the growing future importance of highly detailed and meaningful data acquisition and maintenance processes for water utilities.As the contents of DVGW W 400‑3 (A) form the basis of this Guideline, it has been deliberately structured along the lines of DVGW W 400‑3 (A). The revised version of DVGW W 401 (H) also describes the characteristics of water distribution systems used in the long‑distance water supply. This Guideline offers advice ‑ but no technical rules ? on how to introduce a rehabilitation strategy and elaborate rehabilitation planning. A clear distinction is being made between these afore‑mentioned activities and ongoing service activities (inspection and maintenance). The suggested method is meant to be universally applicable, regardless of the structure of a given water distribution system. Criteria shall be weighted according to the original local conditions prevailing in each case. Any empirical numeric values given are mere support values; concrete href= https://shop.wvgw.de/507926 >here. specific values. This Guideline supersedes DVGW Guideline W 401:1997‑09.