Type 2 — Gas Measurement
Gas Measurement & ReconciliationCustody transfer, mass balance, and calorific value engineering for gas operations.
Accurate gas measurement at fiscal metering points, across transfer interfaces, and through processing and regasification systems. FUTUREGAZ applies structured measurement and reconciliation methods to reduce ambiguity at the points where commercial and regulatory exposure is highest.
A 0.1% measurement error on a 100,000-tonne LNG cargo can represent millions of dollars in settlement exposure. Measurement uncertainty, calibration status, and calculation methodology are not procedural matters — they determine commercial outcomes.
What we deliver
Custody transfer support
Verification of fiscal metering for LNG and natural gas transfers. Covers ultrasonic and Coriolis meter review, tank strapping verification, quantity calculation per GIIGNL Custody Transfer Handbook, and independent check against Ship's Figure and Shore Figure totals.
Boil-off gas (BOG) calculation
Quantification of boil-off gas across storage, laden voyage, and regasification phases. Natural BOG rate calculation, forced vaporisation accounting, reliquefaction credit, and comparison against contractual allowances.
Mass balance reconciliation
End-to-end balance across loading, transport, and discharge. Identifies metering discrepancies, instrument drift, and unaccounted losses. Structured to ISO 6578 LNG measurement procedures and GIIGNL guidelines.
Calorific value and energy calculation
Gross and net calorific value (GCV/NCV) per ISO 6976. Wobbe index calculation for interchangeability assessment. Energy content reporting for gas chromatograph-based quality analysis at custody transfer points.
Why measurement discipline matters.
Gas measurement operates at the intersection of commercial settlement, regulatory reporting, and operational performance. Errors compound through the calculation chain.
Inconsistent reconciliation methodology, undocumented calibration status, or misapplied composition data create exposure across multiple layers simultaneously: contractual disputes, tax basis miscalculation, and emissions reporting discrepancy.
At $600/tonne LNG spot, 0.1% deviation ≈ $600,000 per transfer. Across a terminal or fleet, structured measurement discipline pays for itself many times over.
Where gas measurement applies
LNG import and export terminals
Shore-based custody transfer at loading arms. Coriolis and ultrasonic meter verification, tank gauging reconciliation, ship/shore interface quantity resolution, and GIIGNL-compliant transfer documentation.
FSRUs — Floating Storage Regasification Units
Combined transfer and regasification measurement. Loaded cargo quantity determination, BOG management accounting, send-out metering, and energy calculation for downstream gas networks.
Natural gas transmission pipelines
Fiscal metering at entry and exit points. AGA-7 (turbine) and AGA-9 (ultrasonic) meter performance review, gas quality via chromatography, and reconciliation of linepack and allocation imbalances.
Offshore production platforms
Produced gas metering, flare gas measurement, fuel gas accounting, and sales gas custody transfer. Integration with production allocation systems and export pipeline measurement.
Gas distribution networks
Entry and exit metering, network balance monitoring, unaccounted-for gas (UAG) analysis, and OIML R 140 legal metrology compliance for fiscal measurement points.
Maritime cargo and bunkering
LNG cargo transfer for ship-to-ship and ship-to-shore. Bunker quantity determination, BOG accounting, and energy content verification per IMO and GIIGNL guidelines for LNG-fuelled vessels.
Measurement standards and technologies
Gas measurement at fiscal and custody transfer points is governed by a defined set of international standards. Compliance with these standards is the contractual and legal basis for settlement.
Calorific value calculation
Calculation of gross and net calorific values, Wobbe index, and density from gas composition analysis. The standard basis for energy content determination at custody transfer points.
Turbine and ultrasonic metering
AGA Report No. 7 governs turbine meter measurement; AGA Report No. 9 governs ultrasonic meters. Both define performance requirements, installation conditions, uncertainty budgets, and field verification procedures.
Legal metrology for gas meters
International standard for measuring systems in custody transfer of gaseous fuels. Defines maximum permissible errors, calibration requirements, and traceability obligations for legal-metrology-approved systems.
LNG measurement procedures
Calculation procedures for LNG custody transfer: liquid density at temperature, mass determination from volume and density, vapour phase correction, and energy content from composition analysis.
LNG custody transfer handbook
Industry-standard procedures for LNG transfer quantity determination. Covers measurement systems, calculation methods, ship/shore interface management, and uncertainty requirements for custody-grade metering.
Primary measurement technologies
Coriolis meters for direct mass measurement in high-accuracy LNG transfer. Ultrasonic (multi-chord) for gas and LNG pipeline fiscal metering. Gas chromatography for composition and quality analysis at transfer points.
Work with us
Describe the transfer point, facility type, applicable standards, and current measurement basis. We will assess scope and respond with a structured proposal.
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