7/28/2019 Natural Gas Quality Specifications

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*Normal Cubic Meter or Nm3

shall mean the quantity of Natural Gas, which at conditions of absolute pressure 1.01325 bar and temperature zero (0) degree Celsius, occupiesvolume of one (1) cubic meter.

NATURAL GAS QUALITY SPECIFICATIONS

Value Unit Specification NotesWobbe Index KWh/Nm

313.10-16.37

Gross Calorific Value

(GCV)KWh/Nm

310.20-13.71

Relative Density - 0.56-0.71

CH4 % mole 75.0 min

CO2 % mole 3.0 max

N2 % mole 6.0 max

O2 % mole 0.2 max

Hydrogen sulfide

(H2S)mg/Nm

35.4 max

In exceptional cases and for a time interval that does not exceed two (2) hours; the content of Natural

Gas in Hydrogen sulfide can have a value up to 10.8 mg/Nm3, without however exceeding 6.5

mg/Nm3

as an average Daily value.

Total sulphur mg/Nm3

80.0 maxIn exceptional cases and for a time period that does not exceed 48 hours it can receive values up to 120

mg/Nm3

without however exceeding 90 Mg/Nm3

as an average Weekly value.

Water Dew Point

(WDP)o

C +5 max Under reference pressure of 80 barg.

Hydrocarbons Dew

PointoC +3 max Under any pressure from 1 to 80 barg.

Dust and Liquids

Natural Gas should be practically free from gaseous, solid or liquid substances that could pose

blockage or malfunction or erosion risks to standard gas facilities and standardized gas equipment.

Exception is made to the cases of liquid formation of minuscule droplets in Natural Gas which are

impossible to be removed.

Odorizing Substance The Natural Gas is delivered at the Entry Points without odorizing substance. The OdorizingSubstance is added at the Exit Points, when necessary as per the ASME Code.

TemperatureoC 0-50

Under special NNGTS operation conditions or due to technical reasons and in any case for periods that

do not exceed 4 hours; the temperature may be less than 0C. In this case, Natural Gas temperature

must necessarily be greater than -10C and at least 5C higher than the WDP temperature of Natural

Gas under operating pressure.