BS ISO 20676:2018 pdf free.Natural gas一Upstream area一Determination of hydrogen sulfide content by laser absorption spectroscopy.
Sampling shall be performed in accordance with ISO 10715.
All the materials used for sampling equipment and transfer lines shall be inert to sulfur compounds. For direct sampling, it should include sample conditioning to ensure the gas injected into the analysis unit does not contain any liquid water, dust or liquid hydrocarbons.
WARNING — HS is poisonous, it is important for the user to establish appropriate safety and health practices.
7.4 Measurement of hydrogen sulfide in natural gas sample
Suitable instrument should be selected according to the content of hydrogen sulfide and accuracy requirement.
The analyser should be in the measurement mode while doing the measurement. Connect the gas sample with the analyser according to Figure 2. Adjust the input pressure to 0,2 MPa to 0,4 MPa by the gas regulator. Keep a constant and stable flow rate. The change of the flow rate should be less than 10 %. Sweep the analyser with the gas flow for at least 2 mm.
After the sulfur-containing sample is tested, it should go through the absorption solution before it is vented.
7.5 Data processing
When the analyser is in measurement mode, if the listed result is the content of the analysis, testing result should be read directly. Tithe listed result of the analyser is the absorbance, the content of hydrogen sulfide shall be calculated according to Formula (1). The analytical result should have three significant digits.
8 Repeatability
In the analytical range given by this document, under repeatability conditions, the difference of two test results in a short time interval (30 s) should not exceed the values listed in Table 1 at a 95 % level of confidence. Annex A gives an example of the statistical procedure of the repeatability estimation.
The H2S concentration is calculated using Formula (1]. The uncertainty of the final result is based on Formula [1] with some mathematical computing.BS ISO 20676 pdf free download.
Tags: Natural gas
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