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Gas composition and quality for transmission, yearly Data

Total number of rows: 92


2018 Wobbe Index MJ/Nm³ 54.904 49.381 55.332
2018 Wobbe Index kWh/Nm³ 15.251 13.717 15.370
2018 Water Dew Point °C -24.100 -74.500 -6.400
2018 Total Sulphur mg/Nm³ 3.300 None None
2018 Relative Density [-] 0.636 0.574 0.667
2018 Propane mole - % 2.290 0.470 3.510
2018 Normal Density kg/Nm³ 0.822 0.743 0.863
2018 Nitrogen mole - % 0.290 0.260 1.310
2018 Net Calorific Value MJ/Nm³ 39.586 35.683 40.489
2018 Net Calorific Value kWh/Nm³ 10.996 9.912 11.247
2018 N-pentane mole - % 0.110 0.020 0.130
2018 N-butane mole - % 0.610 0.120 0.780
2018 Methane Number [-] 71.900 68.700 80.000
2018 Methane mole - % 89.590 80.270 95.190
2018 I-pentane mole - % 0.150 0.040 0.180
2018 I-butane mole - % 0.400 0.110 0.460
2018 Hydrogen Sulphide mg/Nm³ 3.100 0.600 5.600
2018 Hydro Carbon Dew Poi °C -10.000 -20.000 -4.500
2018 Hexane+ mole - % 0.060 0.030 0.080
2018 Gross Calorific Valu MJ/Nm³ 43.769 39.452 44.730
2018 Gross Calorific Valu kWh/Nm³ 12.158 10.959 12.425
2018 Ethane mole - % 5.670 3.300 7.750
2018 Carbon dioxide mole - % 0.830 0.250 1.960
2017 Wobbe Index MJ/Nm³ 54.849 53.539 55.318
2017 Wobbe Index kWh/Nm³ 15.236 14.872 15.366
2017 Water Dew Point °C -28.400 -86.300 -8.500
2017 Total Sulphur mg/Nm³ 3.400 None None
2017 Relative Density [-] 0.639 0.575 0.668
2017 Propane mole - % 2.410 0.520 3.870
2017 Normal Density kg/Nm³ 0.826 0.743 0.864
2017 Nitrogen mole - % 0.310 0.250 0.650
2017 Net Calorific Value MJ/Nm³ 39.655 36.616 40.950
2017 Net Calorific Value kWh/Nm³ 11.015 10.171 11.375
2017 N-pentane mole - % 0.110 0.030 0.130
2017 N-butane mole - % 0.620 0.140 0.840
2017 Methane Number [-] 71.600 67.200 79.800
2017 Methane mole - % 89.140 84.990 97.280
2017 I-pentane mole - % 0.150 0.040 0.180
2017 I-butane mole - % 0.400 0.090 0.460
2017 Hydrogen Sulphide mg/Nm³ 2.900 0.100 6.600
2017 Hydro Carbon Dew Poi °C -9.900 -15.900 -7.300
2017 Hexane+ mole - % 0.060 0.010 0.080
2017 Gross Calorific Valu MJ/Nm³ 43.842 40.597 45.220
2017 Gross Calorific Valu kWh/Nm³ 12.178 11.277 12.561
2017 Ethane mole - % 5.860 1.290 8.030
2017 Carbon dioxide mole - % 0.950 0.220 1.730
2016 Wobbe Index MJ/Nm³ 54.804 53.539 55.332
2016 Wobbe Index kWh/Nm³ 15.223 14.872 15.370
2016 Water Dew Point °C -24.900 -42.900 -17.200
2016 Total Sulphur mg/Nm³ 2.667 None None

Data Dictionary

Column Type Label Description
Year date
Qualityvalue text
Unit text
Average float8
Min float8
Max float8

Year

Name Year
Description

Year

Comment
Example 2017
Unit Years
Field Year
Property Contstraint
Type date
Size 4
Format Regex
Validation Rules

Gas quality parameter

Name Gas quality parameter
Description

For each month there are 20 rows with average, min. and max. values for the following gas quality parameters:

Methane, Ethane, Propane, I-butane, N-butane, I-pentane, N-pentane, Hexane+, Carbon dioxide, Nitrogen, and Oxygen. All of these are components of the natural gas and have mole % as unit.

The remaining of the 20 gas quality parameters are described in greater detail below

Gross Calorific Value: A term describing the amount of heat de-veloped by combustion of one cubic metre of gas at constant pressure when the gas and air for the combustion have a temperature of 25°C, the combustion products being brought to that temperature and the water formed by the combustion being present in liquid state. The reference conditions for normal cubic metres are 0°C and 1 atm.

Net Calorific Value: A term describing the amount of heat generated, when the temperature of the combustion air and the natural gas prior to combustion is 25°C, when the combustion products (flue gas) are cooled to 25°C, and when the water produced during combustion is present in the form of steam. The reference conditions for normal cubic metres are 0°C and 1 atm.

Wobbe Index: The Wobbe index offers information about the heating effect a burner is exposed to during combustion of a fuel. The greater the Wobbe index, the greater the heating effect and thereby the greater the load on the burner. The load on a burner is thus directly proportional to the Wobbe index. Different gases with the same Wobbe index will impose the same load on the burner. The Wobbe index can be calculated as the gross calorific value divided by the square root of the relative density.

Normal Density: Normal density is the mass of a normal cubic meter of gas. The reference conditions for normal cubic metres are 0°C and 1 atm. Relative Density: The relative density aka the specific gravity is the density of natural gas divided by the density of air at the same pressure and temperature, and is an expression of the amount of heavier hydrocarbons that are in the natural gas.

Methane Number: A methane number characterises the gas's knock tendency as a fuel for gas engines. It can be compared to the octane number for petrol.

Water Dew Point: Water content of gas described as dew point at the absoluite pressure of 70 bar.

Hydro Carbon Dew Point: The temperature for precipitation of liquid hydro carbons measured at the pressure with the highest hydrocarbon dew point.

H2S: Hydrogen Sulphide content of the natural gas

Total Sulphur: Total Sulphur content of the un-odorized natural gas.

H2S and total sulphur are given as the measurement in Nybro.

Comment
Example Methane
Unit text
Field Qualityvalue
Property Contstraint
Type text
Size 20
Format Regex
Validation Rules

Unit

Name Unit
Description

Unit for the gas quality values. Possible values are:

  • mole - %
  • kWh/Nm³
  • MJ/Nm³
  • kg/Nm³
  • [-]
  • °C
  • mg/Nm³
  • kg/GJ
Comment
Example kWh/Nm³
Unit text
Field Unit
Property Contstraint
Type text
Size 20
Format Regex
Validation Rules

Gas quality average

Name Gas quality average
Description

Yearly average value for the gas quality parameters.

Comment
Example 43.792
Unit Number
Field Average
Property Contstraint
Type float
Size 7.3
Format Regex
Validation Rules

Min

Name Min
Description

Yearly minimum value for the gas quality parameters.

Comment
Example 41.609
Unit Number
Field Min
Property Contstraint
Type float
Size 7.3
Format Regex
Validation Rules

Max

Name Max
Description

Yearly maximum value for the gas quality parameters.

Comment
Example 44.111
Unit Number
Field Max
Property Contstraint
Type float
Size 7.3
Format Regex
Validation Rules