ASTM D, D, and EPA 3C are used for the analysis of permanent gases (also called fixed gases) and light hydrocarbons at the percentage level in all. (A) Hydrocarbon compounds containing between one and five atoms of carbon plus benzene using ASTM D–03 (Reapproved ) (incorporated by. American Standards Testing & Materials (ASTM). D Standard D 03 Standard Test Method for Analysis of Natural Gas by Gas. Chromatography.
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Run a chromatogram of each component to check on its given composition. Larger samples may be used to determine low-quantity components to increase measurement accuracy. Originally approved in NOTE 1 — T h e sample size limitation of 0. They must contain known percents of the components, except oxygen Note 5that are to be determined in the unknown sample. W h e n a planimeter is used, carefully make several tracings and use the average.
To make this determination, enter a 5-mL sample into the short column and reverse the carrier gas after the separation of n-heptane. Enter a 1- to 5-mL sample into the column and reverse the carrier gas flow after n-pentane is separated. A more accurate value for the molecular weight of Cand heavier can be obtained as described in Annex A1. I f hydrogen is present, use aluminum, stainless steel, or other materials inert to hydrogen sulfide for the cylinder, valves, lines, and connections.
Evacuate the sample-entry system and observe the manometer for leaks.
40 CFR – Incorporation by reference. | US Law | LII / Legal Information Institute
Adjust the operating conditions and allow the chromatograph to stabilize. Keep the system short and the drier small to minimize the purging required. The relationship is asfm of temperature, sample size, and carrier gas flow rate. Daily calibrations are recommended. Close the n-pentane cyhnder valve and open Cylinder A valve to admit the n-pentane from the connection and then close the valve on Cylinder A. The sample size must not exceed 0.
40 CFR 600.011 – Incorporation by reference.
Close the valve to the vacuum source and carefully meter the fuel-gas sample from the sample cylinder until the sample loop is filled to the desired pressure, as indicated on the manometer see Fig.
Then admit samples of pure ethane cind propane at kPa mm Hg absolute pressure, and butanes, pentanes, and carbon dioxide at 5-kPa mm H g absolute pressure. I f i n doubt astn the composition, check the n-pentane and isopentane values w ith pure components by the procedure prescribed in Annex A 2. The purity of the carrier gas may be improved by flowing the carrier gas through selective filters prior to its entry asrm the chromatograph.
The satnple loop pressure should be near asmt. A level baseline should be quickly attained in either flow direction i f the column is clean. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
Die bond process intro NOTE 6—Most modem chromatographs have valve x1945-03 that can be temperature controlled. This small sample size is necessary to obtain a linear detector response for methane. The operating conditions, including columns, are also typical and are subject to optimization by competent personnel. Heated lines may be necessary for high hydrocarbon content samples. The slope a, can be calculated by: Samples w i t h up to one atmosphere o f pressure can be entered.
Separation of carbon dioxide must be sufficient so that a 0. Obtain a corresponding chromatogram of the reference standard. The attenuator must be accurate to within 0. This aztm provides quality data and a basis for calculating physical properties such as molecular weight on these fractions. Last prewous edition approved in as e1945-03 Run a sample of the standard mixture at kPa mm H g pressure and obtain peaks for methane and nitrogen.
It is helpful to retain a sample containing some hexanes and heavier for periodic checking. This procedure also removes carbon dioxide, and d194503 results obtained will be on the acid-gas free basis.
Do not rely on oxygen standards that have been prepared for more than a few days. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn. The resolution R must be 1. Summary of Test Method 3.