Requirements concerning the quality of natural gas for transmission

See measurement points for quality parameters of gas fuel transmitted through the GAZ-SYSTEM S.A. transmission gas pipeline system on the Transmission System Map.

See mapping of the exit points of the transmission system to measurement areas to determine quality parameters of gas - E and L gas (as of April 2017)

See average monthly gross calorific value (GCV) at the entry/exit points to the transmission system

See average daily gross calorific value (GCV) at the entry/exit points to the transmission system

See gas quality parameters (measurement areas)

See gas quality parameters (entry / exit points)

See average monthly gross calorific value (GCV) to recount ordered capacity after passing on balancing in energy unit

Requirements concerning the quality of transmitted natural gas

 

Specification

Unit of measure

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 for gaseous fuel

MJ/m3

45.0 - 56.9

37.5 - 45.0

kWh/m3

12.500 - 15.806

10.417 - 12.500

hydrogen sulphide

mg/m3

≤ 7.0

oxygen

% (mole/mole)

≤ 0.2

carbon dioxide

% (mole/mole)

≤ 3.0

mercury vapours

µg/m3

≤ 30.0

water dew point at 5.5 MPa between 1 April and 30 September

ºC

≤ +3.7

water dew point at 5.5 MPa between 1 October and 31 March

ºC

≤ -5.0

hydrocarbon dew point

ºC

0

dust particles with diameter exceeding 5 µm

mg/m3

≤ 1.0

mercaptan sulphur

mg/m3

≤ 16.0

total sulphur

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, i.e.:
- pressure at atmospheric pressure – 101.325 kPa
- temperature – 273,15 K (0ºC)

 According to point 3.3.4 of binding TNC gaseous fuel with a gross caloric value below of the following limits must not be introduced into the transmission system:

  • GCV = 34 MJ/m3(9,444 kWh/m3) for the group E high methane gas system,
  • GCV = 30 MJ/m3(8,333 kWh/m3) for the Lw subgroup low-methane gas system.

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