Gas service pipe and in-house installation technologies

Session 1
Gas service pipe and in-house installation
technologies in Germany
Werner Wessing
1
Gas service pipe and in‐house i
installation technologies in Germany
ll i
h l i i G
Basis: DVGW‐TRGI G 600
2
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
Operation & maintenance, gas installation, system operators
i t ll ti
t
t
A gas installation designed and built to comply with statutory as well as g
g
py
y
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 valve with the exception of gas pressure regulators and i i l i
l
ih h
i
f
l
d
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
Installation example of single‐family h
home with a basement
ith b
t
Gas-fired
Gaskessel boiler
mit Warmwasser-Speicher
with hot water
storage
im Keller.tank located in basement;
gas
line secured
with gas durch
Absicherung
der Gasleitung
flow
switch at the tapping
Gasströmungswächter
an tee;
gas
pressure regulator
inside building
Anbohr-T-Stück
/ Gasdruckregler
Thermische
Absperrthermal cut-off
einrichtung
(TAE)
device
i H
im
Haus.
Gasdruckregler
gas
flow switch
mit reduziertem
with
reduced
Schließwert
cut-off
value
Gasströmungswächter
gas flow switch with a
mit
highgroßem
cut-off Schließwert
value at
bei
>100
mbar
erforderlich
above
100
mbar
required
WW
PE St
GK
G
PE / ST
For pressures above 25 mbar it is
mandatory in Germany to install
gas flow switches in the service line.
pDruck
pressure
≥ 100mbar
Hauptabsperreinrichtung
main
isolation
valve
ohne
bzw. mit
without
or
with
selfselbstschließender,
closing
thermal
device g
thermischer Vorrichtung
≤ 20mbar
Stahl-oroder
Kupferrohrinstallation
steel
copper
piping (bolted,
(geschraubt,
verpresst,
verlötet)
soldered
or press
fittings)
permanent
Nichtlösbare
Verbindung
connection
WW = hot water
GK = gas-fired boiler
2002
5
Components to increase safety in gas di t ib ti
distribution systems / installations
t
/ i t ll ti
Components
Bauteile
Thermische
AbsperrThermal cut-off
device
einrichtung (TAE)
GasströmungsG
t ö switch
Gas flow
wächter (GS)
integriertem
Druckregler
Pressuremit
regulator
with
integrated gas flow switch
Gasströmungswächter
(GDR)
S ti
Sectional
l
Schnittbild
view
offen
open
Funktion
Function
Weßing
2_229_01
Die thermische AbsperreinThe thermal cut-off
cut off device
richtung schließt beim
closes when a specified
Erreichen einer Auslösetemperature of 90-120 °C
temperatur (90°C-120°C) und
is
reached,
isolating
verhindert
den
Gasfluss zu
downstream
gas
den nachgeschalteten,
nicht
equipment
not designed
höher
thermisch
belastbaren
for higher
loads. A
Gasanlagen.
g thermal
Ein Schmelzeinfusion
acting as a
satz,
derelement
als Temperaturtemperature
sensor
locks
sensor
fungiert,
arretiert
bei
der
mit einer Druckfeder
theTAE
spring-loaded
sealing
den
vorgespannten
Schließelement
in place. When
körper.
Wird dietemperature
Auslösethe activation
temperatur
gibt der
is reached,erreicht,
the fusion
Schmelzkörper
den
SchließSchließ
element will release the
körper
frei.
closing
mechanism.
geschlossen
closed
Der Gasströmungswächter (GS)
The gas flow switch works
funktioniert wie ein Schnelllike
a slam-shut
valve.
It is
schlussventil,
dessen
Auslösung
activated
by
a
differential
auf der Bildung eines Differenzpressure.
When
a specified
druckes
basiert.
Beim
Erreichen
flow
rate
is
reached,
the
eines definierten Grenzwertes
für
differential
pressure
increases
den Durchfluss wird die Differenzto above g
the counter-acting
druckkraft
größer
als die entgegengg g
wirkende
Das the
GS
force of Federkraft.
the spring and
schließt.
Je nach
Aufgabe des GS
flow switch
will close.
liegt
der Einbauort
der HausanDepending
on theinflow
switch
schlussleitung
in dereither
Gas- in
function, it is oder
installed
Inneninstallation.
the service line to the building
Arbeitsposition
flow position
Schließposition
closed
position
Im neu entwickelten Gasdruckregler GDR
The newly developed gas pressure
bis max. 4 bar wird der für die Funktion
regulator
rated up 4 bareingebaute
uses the low
der Gasmangelsicherung
gas
flow
cut-off
mechanism
also asdes
a
Mechanismus (Schließen bei Wegfall
gas
release
limiting
valve.
If
the
Vordrucks) auch als Ausströmbegrenvalve's performance
range
is
zungsventil
eingesetzt. Bei
Überschreiten
exceeded,
the
pressure
regulator
des Leistungsbereiches schließt der GDR
cuts
off the g
gas
flow
thereby
y
und
verhindert
damit
möglicherweise
g
einen
unkontrollierten
Gasaustritt
preventing
what may
be an ins
Gebäude.
Die
GS-Funktion
wird
unwanted
gas
release into
thehiermit
vom
Druckregler
übernommen.
building.
Thus the
pressure regulator
also performs the gas flow switch
function.
or inside the building.
2002
6
Piping system
Multi‐family home, gas meter in cellar, connection via service line M
l i f il h
i
ll
i
i
i li
serving additional apartments in back building
cellar installation
Z = meter
7
Operating and test pressures for gas installations in Germany i t ll ti
i G
MAOP
DVGW //
DVGW
TRGI
up to 100 mbar
Test pressures
Load test
Tightness test
1 bar
150 mbar
G 600
above 100 mbar
above
100 mbar
up to 1 bar
combination test at 3 bar
8
Operator responsibilities (1)
All in‐house piping downstream of the main isolation valve is the responsibility of the operator.
responsibility of the operator.
DVGW-TRGI G 600 requirements:
‐
IIn‐house piping must be protected against damage due to mechanical, h
i i
tb
t t d
i td
d t
h i l
chemical and thermal stresses.
‐
Proper stable piping support must be ensured at all times
Proper, stable piping support must be ensured at all times.
‐
If in‐house lines are subsequently enclosed to be hidden from view, appropriate venting of the resulting voids / enclosures must be ensured.
appropriate venting of the 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
Operator responsibilities (2)
‐
If rooms are used for purposes other than those for which they were 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
,
g
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.
Operator responsibilities (3)
Inspections and inspection intervals
Inspections and inspection intervals ‐
The operator must visually inspect the piping or have the piping visually
The
operator must visually inspect the piping or have 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
p
p
y
g
y
authorised installation company every 12 years.
11
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 600
12
Tampering made difficult
Example: Gas flow switch installed in the piping
Multi‐family
Multi
family home with central gas use
home with central gas use
a) no “generally accessible room”
or
b) permanent connection(s)
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 600
13
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
Z = meter
Source: DVGW-TRGI G 600
14
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 g
g
operation.
Only certified companies are allowed to perform gas installation Only
certified companies are allowed to perform gas installation
work in Germany.
Proven compliance with high safety standards
compliance with high safety standards
15