DIN 30670 04/2012 english version

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.

W 105 Guideline 10/2016

W 107 Technical Rule ‑ Standard 02/2016

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.

This Code of Practice W 118 serves as basis for the hydraulic and mechanical dimensioning of wells. The references listed representthe minimum requirements on the dimensioning of vertical filter wells.Well dimensioning shall be performed so that a hydraulically effective, functionally reliable and economic water abstraction from the aquifer is guaranteed in the long run. At the same time, apart from the Basic hydrogeological parameters, the operating company's technical specifications and the well construction technology are of importance. A careful selection from the various options in well dimensioning can often minimise problems during later well operation, for instance ageing phenomena.For the planning specialists in drilling and well construction companies, engineering offices and water utilities, the code of practice shall provide assistance for the hydraulic and static dimensioning of vertical filter wells.

This Technical Standard W 119 serves as basis for the development of wells by desanding. Sand contents arising during well operation can have a disruptive effect. The consequences can for instance be sanding up of the well, destruction of the submersible motor pumps or disruptions in water treatment. In addition, longlastingsand production of a well may lead to soil settlements, which in turn can have a negative Impact on the entire construction.The technical standard defines criteria for assessing the sand content of raw water and provides guide values for a (still to be approved) residual sand content during the development and operation of wells. The requirement of sandfree water (technical absence of sand) raised in DIN 18302 will in particular be explained in more detail.In addition, experts at water utilities, drilling and well construction companies, engineering offices, pertinent authorities and scientific institutions in charge of planning and construction work are provided with aids for the development of wells by desanding.

This Code of Practice W 121 serves as a basis for designing and constructing groundwater monitoring points.The design and construction of groundwater monitoring points is as important for groundwater Monitoring purposes as it is for precautionary, sustainable groundwater protection. Only correctly designed, competently constructed and reliably operating monitoring points can ensure meeting the current requirements of groundwater quality monitoring. A long service life, safe functioning and, in particular, safe sealing,count among some of the important quality features of groundwater monitoring points.This Code of Practice describes how to competently design and construct groundwater monitoring Points for monitoring the quantity and quality of groundwater. It describes the quality requirements for the construction, the building supervision and the acceptance of groundwater monitoring points.

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.