Gas Quality
Standards/
Methodology
Gas Sampling Industry Standards/Methodology:
American Standards Testing & Materials (ASTM)
| D1142-95 |
Standard Test Method for Water Vapor Content of Gaseous Fuels by |
| |
Measurement of Dew Point Temperature |
| D1945-03 |
Standard Test Method for Analysis of Natural Gas by Gas |
| |
Chromatography |
| D5454-04 |
Standard Test Method for Water Vapor Content of Gaseous Fuels Using |
| |
Electronic Moisture Analyzers |
| D4084-07 |
Standard Test Method for Analysis of Hydrogen Sulfide in Gaseous |
| |
Fuels (Lead Acetate Reaction Rate Method) |
| D4468-85 |
Standard Test Method for Total Sulfur in Gaseous Fuels by |
| |
Hydrogenolysis and Rateometric Colorimetry |
| Gas Processors Association (GPA) |
| 2172-09 |
Calculation of Gross Heating Value, Relative Density, and |
| |
Compressibility of Natural Gas Mixtures from Compositional Analysis. |
| 2261-00 |
Analysis for Natural Gas & Similar Gaseous Mixtures by Gas |
| |
Chromatography |
| 2145-09 |
Table of Physical Constants of Paraffin Hydrocarbons and Other |
| |
Components of Natural Gas |
|
Chemical & |
|
|
|
|
Compostion- |
Typical Units |
Measurement |
Standard |
|
Dependent |
(SI) |
Instruments |
Methods/References |
|
Properties |
|
|
|
|
Hydrocarbons & |
Mole % |
Gas Chromatography |
ASTM D1945 |
|
Inerts Content |
GPA 2261 |
|
|
|
|
Carbon Dioxide |
Mole % |
Gas Chromatography |
ASTM D1945 |
|
GPA 2261 |
|
|
|
|
|
Moisture Content |
Lbs/MMSCF |
Non-Depletion Cell |
ASTM D1142 |
|
Electronic Moisture |
ASTM D5454 |
|
|
|
|
H2S Content |
ppmv or |
Calculated via Sulfur |
ASTM D4084 |
|
grains per 100 scf |
Analyzer |
|
|
|
|
Total Sulfur |
ppmv or |
Calculated via Sulfur |
ASTM D4468 |
|
grains per 100 scf |
Analyzer |
|
|
|
|
Relative Density |
|
Gas Chromatography |
GPA 2172 |
|
|
GPA 2261 |
|
|
|
|
|
Compressibility |
|
Calculated via Gas |
GPA 2172 |
|
|
Chromatography |
GPA 2261 |
|
|
|
| Posted Date: 7/27/2010 |
Page 1 of 2 |
Gas Quality
Standards/
Methodology
Additional Information
Calculations
Wobbe Index
= HeatingValue
WobbeIndex 
SpecificGravity
Heating Value
BTUs/CF = BTUs/MSCF x 1000
Oxygen
= Quantity( ppm)
%volume
10,000
Sulfur/Hydrogen Sulfide
Grains/100 CF = Qty(ppm) x 0.0626285
Cricondentherm Hydrocarbon Dew Point
Hourly and Daily Average Cricondentherm Hydrocarbon Dew Point (CHDP) data is calculated by third party software (FlowCAL).
Background Information
This information is being provided to meet the regulatory requirement imposed by NAESB WGQ Standard 4.3.93 and C.F.R. 18 § 284.12 (a) (v).
| Posted Date: 7/27/2010 |
Page 2 of 2 |
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