Gas Chromatographs

Advanced Gas Chromatography for Accurate Hydrocarbon Analysis

Accurate gas composition measurement is critical for operational efficiency, regulatory compliance, and commercial accountability in the oil and gas industry. Circle B Measurement & Fabrication provides state-of-the-art gas chromatograph (GC) solutions that deliver reliable, repeatable, and precise hydrocarbon analysis.

Gas chromatographs separate and quantify individual components within a gas stream, providing essential data for custody transfer, energy content calculations, and gas quality verification. Circle B’s GC offerings combine advanced instrumentation, expert installation, and integration with field services to ensure measurement accuracy across upstream, midstream, and processing operations.

Start working with us today!

Our experts are ready to meet your needs and help with next steps.

Get Started

Start working with us today!

Our experts are ready to meet your needs and help with next steps.

Get Started

Why Choose Circle B for Gas Chromatography

Operators select Circle B for gas chromatograph solutions because we offer:

Comprehensive Product Selection: ABB and Rosemount chromatographs for a variety of applications, including extended hydrocarbon analysis.
Regulatory Compliance: GCs installed and calibrated according to API MPMS, GPA, and BLM standards.
Turnkey Integration: Chromatographs integrated into skids, piping, and control systems for immediate deployment.
Lifecycle Support: Field services, calibration, and ongoing maintenance to ensure consistent measurement accuracy.

Our focus on precision, reliability, and regulatory alignment ensures that gas chromatographs provide defensible data for all operational and commercial needs.

Gas Chromatograph Product Offerings

ABB – NGC8206 and NGC8209

ABB’s NGC8206 and NGC8209 GCs deliver high-accuracy measurement for both standard and extended hydrocarbon analysis:

NGC8206: Ideal for standard hydrocarbon analysis (C1–C5), providing rapid and reliable data for routine operational monitoring.
NGC8209: Supports C6+ through C9+ extended hydrocarbon analysis, enabling detailed characterization of heavier hydrocarbons for custody transfer and gas quality applications.
High-resolution separation and quantification for accurate energy content calculation
Seamless integration with flow computers, MVS systems, and SCADA platforms
Compliant with API MPMS and GPA 2261 / 2186 standards

ABB GCs are well-suited for midstream pipelines, processing plants, and custody transfer points requiring precision measurement.

Rosemount – 370XA and 470XA

Rosemount 370XA and 470XA GCs deliver robust, flexible, and high-performance gas analysis:

370XA: Designed for standard hydrocarbon analysis with high reliability in midstream and upstream applications
470XA: Extended capability for detailed C6+ to C9+ hydrocarbon analysis, providing deeper insight into gas composition
Advanced diagnostics for predictive maintenance and performance validation
Seamless integration with skids, piping systems, and flow measurement devices

Rosemount GCs offer a combination of accuracy, versatility, and ease of operation for complex hydrocarbon measurement applications.

Integration with Field Sampling and Measurement Systems

Circle B does more than provide standalone gas chromatographs — we deliver fully integrated solutions:

Skid Integration: GCs installed on engineered skids with proper piping, supports, and instrumentation layout to ensure representative sampling and accurate analysis.
Sampling Systems: Chromatographs paired with spot sampling or continuous sampling systems for consistent, high-quality data.
Control and Data Systems: Integration with SCADA, MVS, and flow computers for real-time monitoring, reporting, and regulatory compliance.

Integrated systems minimize sample handling errors, maintain integrity, and provide operational visibility, making gas chromatographs a dependable measurement tool for commercial and technical decision-making.

Compliance and Industry Standards

Circle B ensures all gas chromatograph installations comply with recognized industry standards:

API MPMS: Measurement standards for hydrocarbon analysis and flow measurement
GPA 2261: Standard methods for natural gas analysis by gas chromatography
GPA 2186 / 2286: Extended hydrocarbon analysis for C6+ through C9+ components
BLM SOPs: Gas chromatography and sampling procedures where applicable
ASTM Materials: Certified materials used for sampling lines and installation components

Compliance with these standards guarantees measurement reliability, defensibility in custody transfer, and adherence to regulatory requirements.

Field Services and Lifecycle Support

Circle B provides comprehensive lifecycle support for gas chromatographs:

Calibration & Verification: Ensuring analytical accuracy over time in accordance with API and GPA guidelines
Maintenance & Troubleshooting: Field service for instrument performance, diagnostics, and repairs
Sampling System Support: Installation and ongoing support for spot sampling and continuous sampling systems
Data Integration: Integration with flow computers and SCADA systems to provide real-time, verifiable analytical data

These services ensure gas chromatographs maintain high performance, reduce downtime, and provide consistent data for operational and commercial decisions.

Applications Across the Energy Industry

Gas chromatographs are essential for a variety of applications:

Upstream Production: Gas composition analysis for processing, monitoring, and energy content verification
Midstream Transmission: Custody transfer, pipeline monitoring, and gas quality verification
Processing Facilities: Hydrocarbon analysis for dehydration, compression, and gas treatment
Regulatory Compliance: BLM, state, and federal reporting requirements for natural gas measurement

Circle B customizes each gas chromatograph installation to operational and regulatory requirements, ensuring accuracy, repeatability, and reliability in all measurement scenarios.

Why Choose Circle B Measurement & Fabrication

Circle B’s expertise in gas chromatographs combines advanced instrumentation, engineering integration, and field service excellence:

Expert selection and sizing of GCs for your specific application
Turnkey integration with skids, sampling systems, and control networks
Compliance with API, GPA, BLM, and ISO standards
Full lifecycle support, including calibration, maintenance, and troubleshooting
Trusted partner for precise, defensible, and repeatable hydrocarbon analysis

Operators can rely on Circle B to deliver high-accuracy, fully compliant gas chromatograph solutions that support operational efficiency, regulatory compliance, and commercial accuracy.