This standard G 493-2 encompasses personal and professional requirements for companies providing maintenance for gas plants and installations that fall within the scope of DVGW G 495 (A), as well as biogas injection and refeeding plants as specified by DVGW G 265-2 or hydrogen injection plants as specified by DVGW G 265-4 (M).Companies which, within the context of comprehensive plant management, either as original operators or as contractors, are responsible for the maintenance of energy plants, and possess the required personal qualification and organization according to DVGW G 1000 (A), may conduct the maintenance of gas plants without certification as defined by this standard within the network which they have the abovementioned responsibility for. The prerequisite for the maintenance without certification as mentioned above is that the expert and tech-nical conditions detailed in this standard are met by the company’s own workforce or by service providers with a TSM certification or other corresponding certifications. The company shall appoint the experts re-sponsible for maintenance in writing. The fulfilment of these conditions can be verified e.g. during a TSM review according to DVGW G 1000 (A).

This Technical Rule G 492 governs planning, manufacturing, assembly, testing, commissioning and operation, as well as decommissioning and disposal of gas measuring systems of up to 100 bar1 in gas transportation and distribution systems and stations supplying commercial, industrial, or other comparable facilities.

Code of Practice GW 315 provides essential information on how to avoid damaging to existing supply systems during construction operations. It applies to all construction work  and regulates the requirements for construction contractors and operators of supply systems.

This document DIN CEN TR 17797 is written in preparation of future standardization and provides guidance on how injection of H2 into the gas infrastructure can impact processes from the input of gas into the on-shore transmission network up to the inlet connection of gas appliances.

G 495 Technical Rule 11/2015

The aim of this Standard GW 368 is to determine the lengths of pipeline to be locked against longitudinal forces.The Worksheet applies to ductile cast iron and steel pipes, fittings and valves. In principle, the formulaic correspondences described can also be applied to pipes in other materials. However, the properties of the other materials must be taken into account in each case, particularly specific weight and friction coefficient.

This Code of Practice G 493‑1 serves as a basis for certifying and awarding the DVGW certification mark to specialised companies that design, manufacture and set up turn‑key gas pressure regulating and gas measuring stations. Quality, safety and security have always been given top priority by the gas industry, and this shall continue to be so in the future. Company certification is indispensable for meeting this goal; this 5th edition of this Code of Practice provides the basis for certification. This Code of Practice describes not only the qualification criteria to be met by the relevant companies but also ‑ and in some more detail ‑ the fields of work in which appointed experts have to demonstrate particular knowledge. The fact that the Energy Industry Act (EnWG) has now broadened the meaning of the term ?biogas? to include hydrogen from renewable sources has created new qualification requirements for appointed experts. These requirements shall be amended if, when and as href= https://shop.wvgw.de/508694 >here. requirements set forth in this Code of Practice are eligible for certification.