Gas service pipe and in-house installation

Transcription

1 Session 1 Gas service pipe and in-house installation technologies in Germany Werner Wessing 1

2 Gas service pipe and in house installation i technologies in Germany Basis: DVGW TRGI G 600 2

3 Gas installations in Germany Technical requirements: Material and component requirements DVGW certification (state of the art) Installation work DVGW G 600 / TRGI (high temperature resistance requirements, gas flow switches, thermal cut off devices ) Requirements to be met by installation contractor Approval by network operator Requirements to be met by network operator G 600 (TRGI) G 1020 (draft) 3

4 Operation & maintenance, gas installation, ti system operators A gas installation designed and built to comply pywith statutory as well as DVGW TRGI requirements provides the basis for proper, long lasting operation. According to Section 13 of the German Low Pressure Connection Ordinance (NDAV), the operator (legal person for whom the connection is made) is responsible for the proper condition of the gas system downstream of the main isolation i valve with ihthe exception of gas pressure regulators and metering devices that do not belong to him (general duty of occupier to make land and/or premises safe for persons or vehicles). The operating and maintenance instructions in DVGW TRGI provide the operator with the necessary information on how to comply with this duty. Source: DVGW-TRGI G 600 4

5 Installation example of single family home with a basement Thermische thermal cut-off Absperreinrichtung device (TAE) gas Gasdruckregler flow switch with mit reduziertem reduced cut-off Schließwert value Gas-fired Gaskessel boiler mit Warmwasser-Speicher with hot water storage im Keller. tank located in basement; gas Absicherung line secured der Gasleitung with gas durch flow Gasströmungswächter switch at the tapping an tee; gas Anbohr-T-Stück pressure regulator / Gasdruckregler inside building im Haus. Gasströmungswächter gas flow switch with a mit high großem cut-off Schließwert value at bei above > mbar mbar erforderlich required PE / ST PE St G pressure Druck WW GK For pressures above 25 mbar it is mandatory in Germany to install gas flow switches in the service line. 100mbar 20mbar Hauptabsperreinrichtung main ohne isolation bzw. mit valve without selbstschließender, or with selfclosing thermischer thermal Vorrichtung device steel Stahl- or oder copper Kupferrohrinstallation piping (bolted, soldered (geschraubt, or verpresst, fittings) verlötet) permanent Nichtlösbare connection Verbindung WW = hot water GK = gas-fired boiler

6 Components to increase safety in gas distribution ib ti systems / installations ti Bauteile Thermische Absperreinrichtung (TAE) Gasströmungswächter (GS) Druckregler mit integriertem Gasströmungswächter integrated gas flow switch (GDR) Components Thermal cut-off device Gas flow switch Pressure regulator with Sectional view Schnittbild open offen closed geschlossen Arbeitsposition Schließposition flow position closed position Funktion Die thermische Absperrein- Der Gasströmungswächter (GS) Im neu entwickelten Gasdruckregler GDR Function The thermal cut-off device The gas flow switch works The newly developed gas pressure richtung schließt beim funktioniert wie ein Schnellschlussventilbis max. 4 bar wird der für die Funktion closes when a specified Erreichen einer Auslösetemperatur (90 C-120 C) und auf activated der Bildung by a eines differential Differenz- Mechanismus gas flow cut-off (Schließen mechanism bei Wegfall also as des a like a slam-shut dessen valve. Auslösung It is der regulator Gasmangelsicherung rated up 4 bar eingebaute uses the low temperature of C verhindert is reached, den isolating Gasfluss zu druckes pressure. basiert. When Beim a specified Erreichen Vordrucks) gas release auch limiting als Ausströmbegrenzungsventil valve's performance eingesetzt. Bei range Überschreiten is valve. If the den downstream nachgeschalteten, gas nicht eines flow definierten rate is reached, Grenzwertes the für höher equipment thermisch not designed belastbaren den differential Durchfluss pressure wird die increases Differenzdruckkraft to above größer the counter-acting als die entgegen- g und cuts verhindert off the gas damit flow möglicherweise thereby des exceeded, Leistungsbereiches the pressure schließt regulator der GDR Gasanlagen. for higher thermal Ein Schmelzein- loads. A satz, fusion der element als Temperatur- acting as a wirkende force of Federkraft. the spring and Das the GS einen preventing unkontrollierten what may Gasaustritt be an ins sensor temperature fungiert, sensor arretiert locks bei schließt. flow switch Je nach will close. Aufgabe des GS Gebäude. unwanted Die gas GS-Funktion release into wird the hiermit der the TAE spring-loaded mit einer Druckfeder sealing liegt Depending der Einbauort on the in flow der Hausanschlussleitung switch vom building. Druckregler Thus the übernommen. pressure regulator function, is oder installed der either Gas-in also performs the gas flow switch den element vorgespannten in place. When Schließkörper. the activation Wird die temperature Auslösetemperatur is reached, erreicht, the fusion gibt der Inneninstallation. the service line to the building function. or inside the building. Schmelzkörper element will release den Schließ- the körper frei closing mechanism. Weßing 2_229_01 6

7 Piping system Multi family il home, gas meter in cellar, connection via service line serving additional apartments in back building cellar installation Z = meter 7

8 Operating and test pressures for gas installations ti in Germany DVGW / MAOP Load test Test pressures Tightness test TRGI up to 100 mbar 1 bar 150 mbar G 600 above 100 mbar up to 1 bar combination test at 3 bar 8

9 Operator responsibilities (1) All in house piping downstream of the main isolation valve is the responsibility of the operator. DVGW-TRGI G 600 requirements: In house piping i must be protected t against damage due to mechanical, chemical and thermal stresses. Proper, stable piping support must beensured ensured at all times. If in house lines are subsequently enclosed to be hidden from view, appropriate venting ofthe resulting voids / enclosures must be ensured. Remaining line openings (pipe ends and outlets) must be properly closed off; a closed isolation valve alone does not suffice. 9

10 Operator responsibilities (2) If rooms are used for purposes other than those for which they were originally designated, an authorised installation company or the grid operator will have to examine any impact on existing lines. The exact location of lines hidden from view must be known. Gas hose lines must be used such that there is no tension on, or kinking or twisting of, the line. Like the valve on the appliance the gas hose lines must not be subjected to excessive temperatures. Isolation devices must be fully operational and accessible at all times.

11 Operator responsibilities (3) Inspections and inspection intervals The operator must visually inspect the piping orhave the piping visually inspected once every year, making sure there is no smell of gas. The operator must have the operability and tightness checked by an authorised installation company every 12 years. 11

12 Tampering made difficult Example: Gas flow switch installed in the piping Single and double family homes No passive measures required because room is not generally accessible K or M type: Closing factor: f < 1.8 Source: DVGW-TRGI G

13 Multi familyhome withcentral gas use Tampering made difficult Example: Gas flow switch installed in the piping a) no generally accessible room or b) permanent connection(s) or c) secured non permanent connection(s) Multi family home with gas appliances installed in the individual apartments a) no generally accessible room or b) permanent connection(s) or c) secured non permanent connection(s) K or M type: Closing factor: f < 1.8 Z = meter Source: DVGW-TRGI G

14 Gas line routing Routing of in house plastic gas lines if connected to a single gas appliance gas appliance Routing of in house plastic gas lines if connected to a distribution manifold gas appliance K type: Closing factor: f <1.45 Source: DVGW-TRGI G 600 Z = meter 14

15 In house gas installations in Germany Conclusion: The low accident rate caused by in house gas installations show the high quality standards in Germany. There is a comprehensive set of technical codes issued by DVGW covering all areas from design and construction to operation. Only certified companies are allowed to perform gas installation work in Germany. Proven compliance with highsafety standards 15