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News on the DVGW Technical Rules - GasNew publications
G 5305-2 draft "Gas excess flow valves for gas supply lines"
Publication date 9/11, EUR 27.61 (DVGW members), EUR 36.82 (non-members), available in German only
The Technical Committee "Components and auxiliary materials - Gas" has decided to transpose the Preliminary Technical Requirements for the Testing and Approval of Devices 305-2 in accordance with the internal rules of procedure GW 100 into Technical Requirements for the Testing and Approval of Devices G 5305-2. In the course of this process, an adaptation the current structure of the system of rules and an editorial adaptation of the certification-relevant text passages were made. In addition, references to the system of rules were updated.
The excess flow valves according to G 5305-2 lock the gas supply for the downstream line system, if the stipulated shut-off flow is exceeded, e.g. due to a mechanically-induced leakage (excavator attack) with sufficiently high opening cross section.
These technical requirements for the testing and approval of devices apply for requirements and testing of gas excess flow valves up to a nominal width of DN 50 with defined flow direction. They are operated with gases according to DVGW Code of Practice G 260 (but not with liquefied petroleum gas in the liquid phase). According to their operating pressure range they are divided into types A (15 mbar to 100 mbar), B (0.1 bar to 5 bar), C (25 mbar to 5 bar) and D (25 mbar to 1 bar).
Objection period ends on 30/12/2011.
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G 5614 Draft "Permanent pipe joints for metal gas lines; press connectors"
Publication date 9/11, EUR 20.59 (DVGW members), EUR 27.45 (non-members), available in German only
The Technical Committee "Components and auxiliary materials - Gas" has decided to convert the VP 614 in accordance with the internal rules of procedure GW 100 into Technical Requirements for the Testing and Approval of Devices G 5614. Within the scope of conversion, an adaptation to the current structure of the system of rules and an editorial adaptation of the text passages that are relevant to certification was made. In addition, references to the system of rules were updated.
These technical requirements for the testing and approval of devices apply for requirements on and testing of metal press connectors for connecting pipes and pipeline components made of metallic materials, which form a metal-to-metal or non-metal seal against smooth walls. The technical requirements for the testing and approval of devices do not apply to press connectors that are used for buried lines. The press connectors must be suitable for lines which are operated with gases according to DVGW Code of Practice G 260.
These technical requirements for the testing and approval of devices apply for press connectors, which are used in gas pipelines with an outside pipe diameter of d≤ 108 mm and up to nominal pressures of 5 bar (PN 1 or PN 5). For the application range of the interior gas lines according to DVGW Code of Practice G 600 (TRGI) and TRF, they must be resistant against an increased thermal load.
Objection period ends on 30/12/2011
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G 5634 Draft "Safety seals for gas installations"
Publication date 9/11, EUR 20.59 (DVGW members), EUR 27.45 (non-members), available in German only
The Technical Committee "Components and auxiliary materials - Gas" has decided to transpose the Preliminary Technical Requirements for the Testing and Approval of Devices 634 in accordance with the internal rules of procedure GW 100 into Technical Requirements for the Testing and Approval of Devices G 5634. In the course of this process, an adaptation to the current structure of the system of rules and an editorial adaptation of the text passages that are relevant to certification were made. In addition, references to the system of rules were updated, red brass materials were adapted to European and international standards and the sealing material according to DIN EN 682 was deleted.
As passive measure to impede manipulative interventions in the gas installation, DVGW Code of Practice G 600 (TRGI) refers to the use of safety seals, among other things. These are plugs/caps as safekeeping devices on line ends, which can only be opened with special tools.
These Technical Requirements for the Testing and Approval of Devices apply to the requirements on and the testing of single- or multi-part safety seals coming in contact with gas (such as safety plugs, safety caps or a system) in gas installations according to DVGW-G 600 (TRGI) and TRF up to a nominal width of DN 50 (thread size 2) and a nominal pressure of 5 bar. They come at least partly in contact with gases according to DVGW Code of Practice G 260 (but not with liquefied petroleum gas in the liquid phase). Safety devices not coming into contact with gas can also be assessed and certified according to these Technical Requirements for the Testing and Approval of Devices.
Objection period ends on 30/12/2011
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G 465-2 English "Gas lines with operating pressures up to and including 5 bar - Repair"
Publication date 4/02, EUR 20.59 (DVGW members), EUR 27.45 (non-members)
This is the English translation of Code of Practice G 465-2 "Gasleitungen mit einem Betriebsdruck bis 5 bar - Instandsetzung", publication date 04/2002. This publication is only available as PDF download.
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G 469 English "Pressure testing methods for gas transmission/gas distribution"
Publication date 6/10, EUR 24.80 (DVGW members), EUR 33.06 (non-members)
This is the English translation of Code of Practice G 469 "Druckprüfverfahren Gastransport/Gasverteilung", publication date 06/2010. This publication is only available as PDF download.
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DIN Standards
DIN 4815-5 "Rubber and plastic hoses for liquefied petroleum gas - part 5: Safety couplings and couplings for hose assemblies to withdraw liquefied petroleum gas out of pipeline systems - Safety requirements, testing and marking"
Publication date August 2011, price group 8
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DIN EN 624 "Specification for dedicated LPG appliances - Room sealed LPG space heating equipment for installation in vehicles and boats"
Publication date October 2011, price group 21, German version EN 624:2011
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DIN EN ISO 21809-1 "Petroleum and natural gas industries - External coatings for buried or submerged pipelines used in pipeline transportation systems - Part 1: Polyolefin coatings (3-layer-PE and 3-layer-PP)"
Publication date October 2011, price group 23, English version EN ISO 21809-1:2011
We envisage incorporating the draft standards into the DVGW Technical Rules on Gas. The standards form part and parcel of the DVGW Technical Rules on Gas.
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DIN 30681 draft standard "Compensators for gas installations - Expansion joints with stainless steel bellows unit - Safety requirements, testing, marking"
Draft standard, September 2011, price group 12
Please send your objections to nagas(at)din.de by 31st January 2012.
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DIN EN 30-1-2 draft standard "Domestic cooking appliances burning gas - Safety - Part 1-2: Appliances having forced-convection ovens and/or grills"
Draft standard September 2011, price group 12, German version FprEN 30-1-2
Please send your objections to fnh(at)din.de by 12th November 2011.
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DVGW Annual Report 2010 now published
In many areas, DVGW made significant contributions last year, bringing considerable benefits to its members and the entire gas and water industry. This Annual Report gives an overview of our achievements in 2010.
Download
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DIN EN 12732, draft standard "Gas infrastructure - welding steel pipework - Functional requirements"
Draft standard, September 2011, price group 24, German version prEN 12732:2011
Please send your objections to nagas(at)din.de by 19th November 2011.
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DIN EN ISO 13686 draft standard "Natural gas - Quality designation"
Draft standard, June 2011, price group 20, German version prEN ISO 13686:2011
Please send your objections to nagas(at)din.de by 5th November 2011.
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News on the DVGW Technical Rules - Gas/WaterNew publications
GW 335-B3 "Plastic pipeline systems in gas and water distribution - Part B3: Mechanical connectors for water distribution made from synthetic materials (POM, PP)"
Publication date 9/11, EUR 20.59 (DVGW members), EUR 27.45 (non-members)
The draft version of September 2010 is based on the materials POM (polyoxymethylene) and PP (polypropylene). Some objections aimed at taking into consideration further materials such as PE (polyethylene) and PA GF (glass-fibre reinforced polyamide), which are neither contained in DVGW VP 609 (precursor of GW 335-B3) nor in ISO 14236 (basis for GW 335-B3). Thus the question to what extent the requirements profile of GW 335-B3 is suitable for other materials, i.e. whether the plain supplementation of the material-specific tables will be sufficient, could not be resolved within the scope of the discussion of comments.
The responsible technical committee of the DVGW has also rejected an opening clause for additional materials, as they would de facto grant the competing testing/certification bodies the competence of establishing regulations and the manner in which an opening clause could be applied would ultimately be difficult to foresee.
In the end, the draft of GW 335-B3 dated September 2010 was confirmed, apart from smaller corrections. The materials that were not taken into account will have to be dealt with within the scope of a supplementary establishment of regulations.
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News on the DVGW Technical Rules - WaterNew publications
W 235-3 draft version, "Centralised softening in the drinking water supply - ion exchange method"
Publication date 9/11, EUR 27.61 (DVGW members), EUR 36.82 (non-members), available in German only
This Code of Practice was revised by the Project Group on "Membrane and fine filtration" within the Technical Committee "Water treatment methods" and expanded by a chapter dealing with the performance of integrity tests. It applies to the elimination of particles while processing water into drinking water by means of membrane filtration (ultra and micro filtration). It explains the specific terms, the rinsing and cleaning methods as well as the factors influencing operation, the knowledge of which is necessary for planning, operation, monitoring and servicing membrane filtration systems in drinking water treatment.
Plant specific details, which do not influence the process step membrane filtration, are not subject of this code of practice.
Objection period ends on 31/12/2011
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Withdrawals
VP 609 "Synthetic compression and slip joints for the connection of PE pipes in water distribution"
Publication date 9/95, available in German only
These Preliminary Technical Requirements for the Testing and Approval of Devices are superseded by the Technical Requirements for the Testing and Approval of Devices GW 335-B3 "Plastic pipeline systems in gas and water distribution - Part B3", publication date 09/2011.
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