May 14, 2014

Natural Gas Custody Transfer Metering: Optimizing Profitability, Reducing Costs, Simplifying Measurement in Upstream and Midstream Applications

By Jan Bendfeldt, Marketing Manager, Rosemount Analytical

Natural gas is bought and sold based on the level of its energy content. Gas transmission plays a critical role in ensuring these natural gas resources are safely transported, measured, and recorded before reaching their final destination point.Increasing variations in the sources of natural gas, such as unconventional shale gas, is making it harder to ensure that the gas entering the network meets the company’s specifications and that the assumptions regarding metering conditions always hold true. If the gas is not analyzed properly or if the gas quality changes dramatically, the accuracy of the flow measurement and energy calculations will be compromised. If the flow and energy measurements on the inlet and outlet of the transmission network do not match, the lost energy across the network results in lost revenue. Have you seen a drop in energy across the network?

370XADesigned to address some of today’s toughest measurement challenges in the upstream and midstream natural gas markets, Emerson introduces the Rosemount Analytical 370XA gas chromatograph (GC) for C6+ BTU / CV applications, including custody transfer, power generation and burner fuel/air ratio control. Meant to operate unattended in even the most extreme weather conditions and withstanding ambient temperatures within -20 °C to 60°C (-4 °F to 140 °F), the smarter, compact, and more economical 370XA features advanced technology, improved diagnostics, and an intuitive local operator interface (LOI ). Built-in software assistants included in the LOI guide the user through common operation and troubleshooting tasks, greatly simplifying the installation, startup, commissioning and on-going maintenance of the 370XA.

A unique innovation of the 370XA is its Maintainable Module™ technology. It incorporates the GC’s analytical components inside of a module that can be easily maintained or replaced at the component level in the field in most cases, substantially reducing repair costs and downtime. If the module needs more serious repair, a replacement module can be installed while the damaged one is sent to the lab or back to the manufacturer for further inspection. Upon replacing the module, the GC will automatically begin to self-diagnose and self-calibrate, doing much of the startup on its own and getting back online without having pressed a button.

530In addition, the 370XA reduces overall lifecycle costs by decreasing power and carrier gas consumption. This GC requires only 50 watts of 24V DC line power at startup and 20 watts in the steady-state mode. Special features help reduce both ongoing carrier gas consumption through more efficient design and consumption of expensive calibration gases by minimizing calibration gas flows during the purge cycle.

In summary, the 370XA simplifies natural gas measurement analysis while lowering costs, reducing training and maintenance requirements, and providing accurate measurement to increase profitability. For more information watch this video or click here for more data.

Does your application require a full process GC or could a compact C6+ gas chromatograph be a more appropriate solution?

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