DIN 30670 04/2012 english version

DVGW Information WATER No. 108 02/2021

Forschungsbericht W 202011 07/2021 englisch

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 document ISO 17885 specifies the requirements for mechanical fittings for joining plastic piping systems for the supply of gaseous fuels, the supply of water for human consumption and other purposes, as well as for industrial application. It provides a unified set of test methods to check the performance of the fittings, depending on their intended use. It is the responsibility of the purchaser or specifier to select the appropriate fitting, taking into account their particular requirements and any relevant national guidance or regulations and installation practices or codes.

This Standard W 1003 relates to the piped supply of public water under normal operating conditions. Covering the different technical aspects and value-added steps, it provides an integral overview of how to de-scribe, analyse and assess the resilience and security of supply in water supply areas.

W 105 Guideline 10/2016

W 107 Technical Rule ‑ Standard 02/2016

This Standard W 110 intends to offer guidance for the beneficial use of geophysical logging measurements. It aims to help the user find the optimal combination of logging techniques for a defined task as early as in the concept phase of borehole surveys in vertical and, where due to design constraints, partially also in horizontal filter wells as well as in groundwater monitoring points. It is by no means a tool for evaluatingand interpreting geophysical measurements, a field that in the course of the last decade has evolved into an almost autonomous scientific discipline and, therefore, should be reserved for the relevant experts toengage in.This Standard applies to the design and execution of geophysical measurements in boreholes for groundwater exploration and abstraction in unconsolidated and consolidated rock, including well and groundwater monitoring point surveys. Drillings and probes used in near‑surface geothermal systems have a Special position in this context.

This Code of Practice W 111 shall apply to pumpingtests during groundwater prospection anddevelopment and to well performancereviews. pumping test or, to be more precise, well oraquifer test is performed between the constructionand casing and the commissioning of a well. Itdocuments the net output of the well that wasachieved during the development stage, and permitsdrawing extensive conclusions about the localhydrogeological and hydraulic conditions. ThisCode of Practice intends to explain how toproperly execute pumping tests to acquire and makeavailable the considerable amount of data in thecorrect form. The information provided by pumpingtests is crucially important for the futureoperation of a well as a repeat pumping test at alater point in time can help identify the well?sageing process and record it appropriately, thusfacilitating the timely initiation of regenerationor rehabilitation measures.

Knowledge of the grain size distribution of water‑conducting granular soil is of great importance for the construction of wells and for the description of the hydrogeological conditions. It is in particular possible to determine the required gravel‑pack diameter in a well's filter section on the basis of the cumulative grain size curve and the grain size distribution curve. In addition, it is possible to derive estimated data for the coefficient of hydraulic conductivity and the porosity of the examined soil sample. Results of the DVGW Research project  Examinations on the stability and clogging of sand and gravel filters during drilling  (DVGW 1982) have been included in the here described procedure to determine the required gravel‑pack diameter. Compared to the Technical Standard W 113  Determination, representation and evaluation of the grain size distribution of water‑conducting granular soils for geohydrological examinations and for the construction of wells  from the year 1983, different practical possibilities for determining the required gravel‑pack diameter and the hydrogeological parameters coefficient of hydraulic conductivity and porosity are demonstrated. Apart from determining the grain size distribution, details on its representation and especially on its evaluation have been provided.

This Code of Practice W 115 provides information on the usual drilling methods and their applications. In addition, it contains references to possible faults during water development work, which may have consequences for operation, maintenance (regeneration, rehabilitation) and dismantling. As a summarising abstract it shall serve anyone involved with drilling operations as starting point for projectrelatedconsiderations.