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Chromatographic Gas Analysis - Our laboratory specializes in "hexanes plus" chromatographic analysis of natural gas as described in GPA standard 2261. Reports include complete compositional detail by component, as well as physical characteristics of the gas such as Btu and relative density, which are calculated using the most current GPA physical constants and formulas. Other capabilities include performing historical statistical analyses, based on either standard deviation or percent change, and electronic data transmission of results, which allows the ability to automatically update analytical values used to perform volume calculations.

Chromatographic NGL Analysis - Natural gas liquids and light condensates are also analyzed using gas chromatographs according to GPA method 2165. Like method 2261, this is also a "hexanes plus" method, but on liquids we offer customers the option of performing a "heptanes plus" analysis. Liquid reports include compositional detail, specific gravity, molecular weight, absolute density, and cubic feet of vapor per gallon of liquid.

Extended Analyses - In some situations where customers may require more detail and accuracy than what is provided in a "hexanes plus" analysis, we can perform an "extended analysis" on gases and liquids. In this method, the "hexanes plus" fraction is analyzed on a capillary column and flame ionization detector (FID) using a temperature programmed method as outlined in GPA methods 2186 and 2286. An extended analysis lab report includes all of the same information as provided on a standard "hexanes plus" analysis, plus compositional detail of the "hexanes plus" fraction from C6 through C11+ and calculated physical characteristics of the hexanes plus. For liquid samples, a "heptanes plus" option is available.

BTEX Analysis - In recent years, many customers have found that in certain gas processes which involve atmospheric emissions, such as dehydration, a BTEX analysis of the gas may be needed to comply with environmental regulations. BTEX is an acronym for benzene, toluene, ethyl benzene, and xylenes, which are the major aromatic components in the "hexanes plus" fraction of natural gas. The analytical method for a BTEX analysis is exactly the same as an extended gas analysis, but on the lab report, the BTEX components are reported on a separate page.

Quality Control - Coastal Flow is an active participant in the Scott Specialty Gases Natural Gas Cross-Reference Program where we have consistently attained results that demonstrate exceptional accuracy and reproducibility. Furthermore, an independent third-party testing laboratory audits our laboratory annually to verify our procedures are in accordance with acceptable GPA standards.

Laboratory Supplies - Our laboratory furnishes all of the necessary sample cylinders, tags, and sample shipping containers to facilitate your gas sampling and shipping requirements. Training and assistance in developing hazardous material handling procedures in accordance with Department of Transportation regulations are also available.

Engineering & Consulting - Whether in the design of new sampling and/or chromatography systems or troubleshooting existing systems, our expert consultants are available to address your requirements.

Hydrocarbon Dewpoint - Hydrocarbon dewpoint is the temperature at which the heavier hydrocarbons condense out of the gas stream. It is pressure dependent, and pipeline specifications are typically based on maximum hydrocarbon dewpoint. In our experience, most pipelines are calculating the dewpoint from chromatographic gas analysis as opposed to actually performing field tests. This is an acceptable practice so long as the assumptions for determining the C6 plus fraction of the gas are consistent with those used for Btu determination. In some cases, it may be necessary to perform an extended analysis to determine the actual composition of this aggregate component.

We welcome the opportunity to provide our expertise in determining or verifying the hydrocarbon dewpoint of your gas purchases or deliveries. In most cases, just furnish us with a copy of the gas analysis that the dewpoint is based on and we will perform an independent calculation and review. If any discrepancies occur, you can rely on Coastal Flow's professional and technical staff to represent you.