NTS gaseous fuel quality specifications
Quality characteristics of transported gas
Read more- Monthly average gross calorific values and Wobbe index values at the entry and exit points of the transmission system
- Daily average gross calorific value and Wobbe index at the entry and exit points of the transmission system
- Quality parameters of gaseous fuel (chromatographic areas)
- Quality parameters of gaseous fuel: (entry/exit points)
- Monthly average gross calorific values for the conversion of contracted capacity after the transition to balancing in energy units
Requirements concerning the quality of natural gas for transmission
Read more|
Item |
Unit |
System |
|
| natural gas grade E | natural gas grade Lw | ||
| min. gross calorific value |
MJ/m3 |
38,0 |
30,0 |
|
kWh/m3 |
10,556 |
8,333 |
|
| range of the Wobbe index variability |
MJ/m3 |
45,0 - 56,9 |
37,5 - 45,0 |
|
kWh/m3 |
12,500 - 15,806 |
10,417 - 12,500 |
|
| hydrogen sulphide content |
mg/m3 |
≤ 7,0 |
|
| oxygen content |
% mol/mol |
≤ 0,2 |
|
| carbon dioxide content |
% mol/mol |
≤ 3,0 |
|
| mercury fumes content |
µg/m3 |
≤ 30,0 |
|
| water dew point temperature for the pressure of 5.5 MPa from 1 April to 30 September |
ºC |
≤ +3,7 |
|
| water dew point temperature for 5.5 MPa from 1 October to 31 March |
ºC |
≤ -5,0 |
|
| hydrocarbon dew point |
ºC |
0 |
|
| dust content - particle diameter greater than 5 μm |
mg/m3 |
≤ 1,0 |
|
| mercaptan sulphur content |
mg/m3 |
≤ 16,0 |
|
| total sulphur content |
mg/m3 |
≤ 40,0 |
|
| range of the temperature variability of gaseous fuels introduced to the transmission system |
ºC |
0 - 50 |
|
Except for the water dew point temperatures, all values in the table refer to normal conditions.
- pressure equal to atmospheric pressure – 101.325 kPa
- temperature – 273,15 K (0ºC)
According to point 3.3.4 of the current TNC, the minimum gross calorific value of gaseous fuel introduced to the transmission system is:
- Hs = 34 MJ/m3 (9.444 kWh/m3) for group E high-methane gas system,
- Hs = 30 MJ/m3(8.333 kWh/m3) for the Lw group low-methane gas system.
