SGT gas quality specifications
- Measurement points for quality parameters of gaseous fuel transported through the Transit Gas Pipeline System on the SGT map
- Daily average gross calorific values and Wobbe index values SGT
- Monthly average gross calorific values and Wobbe index values SGT
- See the monthly average gross calorific value for the calculation of the SGT contracted capacity
| Quality specifications | Unit | TGPS |
| Gross calorific value* |
MJ/m3 |
39,895 ± 0,4186 |
| Gross calorific value* |
kWh/m3 |
11,082 ± 0,1163 |
| Net calorific value** |
MJ/m3 |
33,4944 ± 0,4187 |
| Net calorific value** |
kWh/m3 |
9,3040 ± 0,1163 |
| Methane |
% mol |
≥ 92,00 |
| Ethane |
% mol |
≤ 4,00 |
| Propane, butane and heavier hydrocarbons |
% mol |
≤ 2,00 |
| Nitrogen |
% mol |
≤ 2,00 |
| Carbon dioxide |
% mol |
≤ 1,00 |
| Oxygen |
|
traces |
| Mercaptan sulphur |
mg/m3 |
≤ 5,6 |
| Hydrogen sulphide |
mg/m3 |
≤ 2,0 |
| Total sulphur |
mg/m3 |
≤ 20,0 |
| Water dew point at 3.92 MPa |
oC |
≤ - 8,0 |
| Hydrocarbon dew point under working pressure |
oC |
≤ 0 |
| Hydrocarbon dew point under a pressure of 2.7 MPa |
oC |
≤ 0 |
| Absolute pressure at entry point |
MPa |
≥ 6,1 |
| Absolute pressure at exit point |
MPa |
≥ 6,1 |
* - value for normal conditions
** - value for contractual conditions
The values in the table refer to the contractual conditions, i.e.:
-pressure equal to atmospheric pressure – 0.101325 MPa
-temperature - 293,15 K (20ºC)
-for combustion process 293,15
Gas volume conversion factor from 20ºC to normal conditions at 0ºC is 0.93168
The factor for the conversion of contracted capacity expressed in m3 GOST/h (at 20ºC) to capacity expressed in kWh/h is 10.322 kWh/m3 GOST.