The quality of natural gas testing results are only as good as the method, tools and training. We discuss some helpful tips and sampling guidelines.
Understanding and optimizing sampling methods for natural gas sampling are key factors in getting accurate test results. Let's discuss some key factors that will determine successful natural gas testing results.*
In this blog post you will learn:
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Most test errors are not related to the sample testing itself, but are mostly attributed to the sample capture, and transport methods. Spot, continuous composite, or continuous sampling methods have advantages and disadvantages but a reactive or poorly designed sample transport flow path will yield unreliable test results.
Select the method that best fits your application and need, then be sure the sample flow path meets design criteria and is inert. The most widely used natural gas sampling methods are GPA standard 2166-05, ISO-10715 and API 14.1. Following the method that best fits your application and need will go a long way toward getting reliable and repeatable test results. David Fish from Welker Inc. authored an excellent reference for natural gas sampling. The paper provides sampling tips, methods and maintenance guidelines.
Individual component design should be appropriate for the application. Installation location is also a key factor:
Sample measurement devices are capable of measuring natural gas Btu content to .5 Btu, but poor techniques can cause variation as high as 65 Btu in a single cylinder. A poor sample system design can make repeatable natural gas testing for Btu, sulfur and mercury nearly impossible.
Active and adsorptive surfaces like stainless steel, Monel® or other alloys can completely adsorb sulfur and mercury in the natural gas sample. Artificially low sulfur readings can impact feedstock value, poison downstream catalysts, and cause artificially low odorant measurement.
Get our Sulfur Sampling Application Note to learn more about coatings and components that improve natural gas and sulfur sampling.
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* Image credit: Welker Engineering