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Gas composition and quality for transmission, yearly Data

Total number of rows: 115


2019 Wobbe Index MJ/Nm³ 54.495 53.233 55.181
2019 Wobbe Index kWh/Nm³ 15.138 14.787 15.328
2019 Water Dew Point °C -19.000 -66.400 -7.100
2019 Total Sulphur mg/Nm³ 2.600 None None
2019 Relative Density [-] 0.621 0.573 0.659
2019 Propane mole - % 1.750 0.040 3.310
2019 Normal Density kg/Nm³ 0.803 0.741 0.852
2019 Nitrogen mole - % 0.290 0.250 0.790
2019 Net Calorific Value MJ/Nm³ 38.812 36.346 40.410
2019 Net Calorific Value kWh/Nm³ 10.781 10.096 11.225
2019 N-pentane mole - % 0.070 0.000 0.140
2019 N-butane mole - % 0.460 0.010 0.770
2019 Methane Number [-] 71.700 69.400 79.900
2019 Methane mole - % 91.200 86.550 96.840
2019 I-pentane mole - % 0.110 0.000 0.200
2019 I-butane mole - % 0.310 0.030 0.480
2019 Hydrogen Sulphide mg/Nm³ 2.800 0.000 4.700
2019 Hydro Carbon Dew Poi °C -9.500 -20.000 -5.600
2019 Hexane+ mole - % 0.050 0.010 0.090
2019 Gross Calorific Valu MJ/Nm³ 42.942 40.306 44.644
2019 Gross Calorific Valu kWh/Nm³ 11.928 11.196 12.401
2019 Ethane mole - % 5.010 2.280 7.380
2019 Carbon dioxide mole - % 0.760 0.150 1.750
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

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 Constraint
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\u00b0C, 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\u00b0C 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\u00b0C, when the combustion products (flue gas) are cooled to 25\u00b0C, and when the water produced during combustion is present in the form of steam. The reference conditions for normal cubic metres are 0\u00b0C 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\u00b0C 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 Constraint
Type string
Size 20
Format Regex
Validation Rules

Unit

Name Unit
Description

Unit for the gas quality values. Possible values are:

  • mole - %
  • kWh/Nm\u00b3
  • MJ/Nm\u00b3
  • kg/Nm\u00b3
  • [-]
  • \u00b0C
  • mg/Nm\u00b3
  • kg/GJ
Comment
Example kWh/Nm\u00b3
Unit text
Field Unit
Property Constraint
Type string
Size 20
Format Regex
Validation Rules

Gas quality average

Name Gas quality average
Description

Average value for the gas quality parameters.

Comment
Example 43.792
Unit Number
Field Average
Property Constraint
Type number
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 Constraint
Type number
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 Constraint
Type number
Size 7.3
Format Regex
Validation Rules