GB/T 27894.6-2012Natural gas -- Determination of composition with defined uncertainty by gas chromatography -- Part 6: Determination of hydrogen helium oxygen nitrogen carbon dioxide and C1 to C8 hydrocarbons using three capillary columns (English PDF)

Foreword

GB/T 27894 "natural gas under certain uncertainty by gas-phase chromatography composition" is divided into six parts.

--- Part 1. Analysis of guidelines;

--- Part 2. measurement system characteristics and statistics;

--- Part 3. with two packed columns Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C8;

--- Part 4. laboratory and on-line measuring system using two columns Determination of nitrogen, carbon dioxide and C1 to C5 and C6 of Hydrocarbons;

--- Part 5. using laboratory and on-line processing system three columns Determination of nitrogen, carbon dioxide and C1 to C5 and C6 of Hydrocarbons;

--- Part 6. Determination of capillary column with three of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons C1 to C8's.

This is Part 6 GB/T 27894 in.

Rules in this section in accordance with GB/T 1.1-2009 given draft.

This section uses the translation method identical with ISO 6974-6:2002 "gas at a certain degree of uncertainty with the composition determined by gas chromatography method Part 6. Determination of capillary column with three of hydrogen, helium, oxygen, nitrogen, carbon dioxide and C1 to C8 hydrocarbons. " Consistent correspondence between this standard international documents and normative references of the following documents.

--- GB/T 5274-2008 gas analyzer calibration weighing method for preparing a mixed gas (ISO 6142:2001, IDT)

--- GB/T 10628-2008 Gas analysis - Determination of the composition of calibration gas mixtures and calibration Comparative Law (ISO 6143:2001, IDT)

--- GB/T 14850-2008 gas analysis vocabulary (ISO 7504:2001, IDT)

--- GB/T 27894.2-2012 natural gas under certain uncertainty by gas chromatography to determine the composition Part 2. Measurement System characteristics and statistics (ISO 6974-2:2001, IDT) this part of the National Gas Standardization Technical Committee (SAC/TC244) centralized.

This section drafted by. China Petroleum Daqing Oilfield Engineering Co., Ltd., China Petroleum and Natural Gas Research Institute, Southwest Oil and Gas Field Company.

1 Scope

This section GB/T 27894 gives the determination of hydrogen gas with three quantitative capillary column, helium, oxygen, nitrogen, carbon dioxide and C1 to C8 hydrocarbon content of a gas chromatography. This method is suitable for analysis within the range of mole fractions given in Table 1 gas group Min. These ranges do not represent the detection limit, and that the use of the method in this range to achieve a predetermined precision. While the sample will have a or more of the components can not be detected, but this method can still apply.

In conjunction with Part 2 GB/T 27894 This part of the GB/T 27894 Part 1 and GB/T 27894 in.

The method is also suitable for the analysis of substitute natural gas.

Table 1 Scope

Component formula mole fraction /% Helium He 0.002 ~ 0.5 Hydrogen H2 0.001 ~ 0.5 Oxygen O2 0.007 ~ 5 Nitrogen N2 0.007 ~ 40 Methane CH4 40 ~ 100 Carbon monoxide a CO 0.001 ~ 1 Carbon dioxide CO2 0.001 ~ 10 Acetylene a C2H2 0.001 ~ 0.5 Ethylene a C2H4 0.001 ~ 0.5 Ethane C2H6 0.002 ~ 15 Propylene a, b C3H6 0.001 ~ 0.5 Propane b C3H8 0.001 ~ 5 Isobutane C4H10 0.0001 ~ 1 Butane C4H10 0.0001 ~ 1 2,2-dimethyl propane (neopentane) C5H12 0.0001 ~ 0.5 2-methylbutane (isopentane) C5H12 0.0001 ~ 0.5 Pentane C5H12 0.0001 ~ 0.5 GB/T 27894.6-2012/ISO 6974-6:2002