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Determination of hydrogen sulfide content in natural gas. Length-of-stain detector tubes method
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Basic data
| Standard ID | SN/T 2943-2011 (SN/T2943-2011) |
| Description (Translated English) | Determination of hydrogen sulfide content in natural gas. Length-of-stain detector tubes method |
| Sector / Industry | Commodity Inspection Standard (Recommended) |
| Classification of Chinese Standard | E24 |
| Classification of International Standard | 75.060 |
| Word Count Estimation | 7,758 |
| Date of Issue | 2011-05-31 |
| Date of Implementation | 2011-12-01 |
| Adopted Standard | ASTM D4810-2006, MOD |
| Regulation (derived from) | National-Quality-Inspection-accreditation (2011) 291 |
| Issuing agency(ies) | General Administration of Customs |
| Summary | This standard specifies the standard method of measuring hydrogen sulfide content in natural gas detector tube coloring length method. The lower limit of the detection range of the detector tube used for 0. 5��L/L, the upper limit of up to 40% (by volume). This standard applies to the determination of hydrogen sulfide content of the gas. |
SN/T 2943-2011: Determination of hydrogen sulfide content in natural gas. Length-of-stain detector tubes method
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of hydrogen sulfide content in natural gas.Length-of-stain detector tubes method
People's Republic of China Entry-Exit Inspection and Quarantine Standards
Natural gas - Determination of hydrogen sulfide content
Coloring length detector tube method
Issued on. 2011-05-31
2011-12-01 implementation
People's Republic of China
The State Administration of Quality Supervision, Inspection and Quarantine released
Foreword
This revised standard adopts the American Society for Testing and Materials standard ASTMD4810.2006 "with a detector tube length coloring method test gas
Hydrogen sulfide standard methods. " This standard reg number and ASTM4810.2006 reg number control see Appendix A.
--- The standard according to GB/T 1.1-2009 "Standardization Guide Part 1. Standard structure and preparation of" Code requirements
Write, and edit it according to customary Chinese.
--- This standard will change the title to "Determination of hydrogen sulfide gas detector tube coloration length method."
This standard is proposed and managed by the National Certification and Accreditation Administration Committee.
This standard by the People's Republic of China SZCIQ responsible for drafting.
The main drafters of this standard. Zhangqi Fang, Fang Hong, Chen Guofeng, Yerui Jun, Yang contend.
This standard is the first release of the entry-exit inspection and quarantine industry standards.
Natural gas - Determination of hydrogen sulfide content
Coloring length detector tube method
1 Scope
This standard specifies the standard method of hydrogen sulfide gas detector tube coloring Determination length method. The detection range of the detector tube used
The lower limit of 0.5μL/L, upper limit of up to 40% (by volume).
This standard applies to the determination of gas hydrogen sulfide content.
2 Method summary
By detecting the sample tube filled with a specified chemical substance, wherein the chemical reaction of hydrogen sulfide with a color change and color it.
When the proportional content of the sample volume is constant, the length of the colored sample test tube of hydrogen sulfide.
3 Instrument
3.1 --- sealed glass test tube, the top can be broken to load sampling pump. Reagent layer tube, generally based on silica gel as a substrate, coated
A layer of chemicals. This chemical is specific, it can produce significant changes in the color of the face of the sample gas hydrogen sulfide. known
Any interference must be listed in the test tube with the additional specification. Scale value should be directly on the wall, or by other marks. Hydrogen sulfide
Related to the concentration and length of coloring, these markers can be scaled value from the test tube provided with a very easy to read the content of hydrogen sulfide. Such as
If the instrument can be according to the manufacturer's requirements to save, detector tube valid for at least two years. For each test tube should be performed to confirm the identification of
Accuracy (generally ± 25%) detector tube.
3.2 --- detector tube sampling pump piston or bellows-type manual sampling pump. Each stroke must be able to inhale a sample of 100cm3 deviation
± 5cm3. It is specially designed test tube.
Should a test tube and a sampling pump to form a detection unit to use. Each vendor calibrated test tube match their own
Sampling pump. Different brands of sampling pumps and detector tube can not be mixed with each other, this will lead to inaccurate results (at least one instrument manufacturing plant Yun
Xu will expand the sample size to 100 strokes to obtain lower detection limits. For screening purposes require automatic operation, from the position by vacuum
A collapsible container inhalation sample, sample flow rate should be maintained at a predetermined flow rate within the instrument manufacturer of ± 5%. Such a device is very content
Easy to lose accuracy, and recommend such a system to screen only. Limit reference instrument manufacturer's instructions).
3.3 gas sample chamber --- any container, as long as the sample under atmospheric pressure to allow uniform flow rate into the test tube, and the sample with a week
Ambient air can be separated. In the middle of the gas supply valve and the sample chamber has a stainless steel needle valve (or pressure regulator) to control the sample flow rate, the flow rate of approximately
It changes every minute from 1 to 2 volume, or test tube sampling process should remain at least stable air flow.
Step 4
4.1 Selecting a sampling point to provide a representative sample for testing. Sample points should be at the top of the pipe, and is equipped with stainless steel sample probe,
It may extend the middle third of the pipeline. Open the gas supply valve immediately purge valves and other connections.
4.2 Install needle valve (or pressure regulator) in the gas supply valve at the outlet. Hose connections as short as possible a sample chamber (see Figure 1). Avoid using
Material capable of reacting with hydrogen sulfide or hydrogen sulfide absorption, such as copper or natural rubber. You can use TFE- carbon fluoride, ethylene, polyethylene, or not
Stainless steel.
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