Metering & Custody Transfer Systems Suppliers, Saudi Arabia

Metering & Custody Transfer Systems are precision measurement installations used to accurately quantify the volume and quality of oil and gas as it changes ownership or crosses commercial boundaries. These systems include turbine meters, ultrasonic meters, Coriolis meters, flow computers, proving systems, and sampling equipment. In the GCC, where billions of dollars of crude oil and gas change hands daily, metering accuracy is a financial and regulatory imperative.

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Metering and custody transfer systems are among the most commercially significant equipment installations in the GCC oil and gas industry. Every barrel of crude oil exported from Ras Tanura, every cubic meter of gas delivered to an industrial consumer in Jubail, and every shipload of LNG loaded at Das Island must be measured with the highest accuracy to protect the financial interests of all parties in the transaction.

Custody transfer metering systems for liquid hydrocarbons typically use turbine meters or ultrasonic meters in a multi-run configuration (3 or 4 parallel meter runs plus a standby), with a bi-directional ball prover for calibration. Coriolis meters are increasingly used for high-value or challenging applications. Gas metering systems employ ultrasonic or orifice meters with online gas chromatographs for composition analysis. Flow computers calculate volumes corrected for temperature, pressure, and density, applying the relevant measurement standard (API MPMS / AGA).

Procurement should specify compliance with API MPMS (Manual of Petroleum Measurement Standards) chapters relevant to the application, the required measurement uncertainty (typically plus or minus 0.15-0.25% for fiscal metering), and the data communication protocol (Modbus, HART, or OPC). Flow computer certification to weights and measures standards and cybersecurity requirements for connected systems are also important. Key suppliers include Emerson (Daniel), Cameron (Caldon), Honeywell, KROHNE, and Endress+Hauser. Metering system design, fabrication, and commissioning should involve a specialist metering engineer to optimize the installation and ensure compliance with the operator's fiscal metering manual.

Frequently Asked Questions — Metering & Custody Transfer Systems

What measurement accuracy is required for custody transfer in the GCC?

Fiscal custody transfer metering in the GCC typically requires overall measurement uncertainty of plus or minus 0.15% to 0.25% for liquid hydrocarbons and plus or minus 0.5% to 1.0% for gas. These targets must be achieved under all operating conditions and are verified through regular meter proving and calibration against traceable standards.

How often must custody transfer meters be proved or calibrated?

Liquid meters are typically proved against a prover loop on a weekly to monthly basis, with the proving frequency defined in the custody transfer agreement. Gas meters are verified against calibration data quarterly to annually. Ultrasonic meters require periodic path verification and transducer replacement at manufacturer-recommended intervals.

What is the role of a flow computer in a metering system?

The flow computer receives raw signals from the meters (pulse counts, pressure, temperature, density) and applies the appropriate calculation algorithms per API MPMS standards to compute corrected volumes, mass, and energy quantities. It also manages alarms, generates reports, and interfaces with SCADA systems. Flow computers must be certified for custody transfer and tamper-proof to maintain audit integrity.

What cybersecurity measures should be applied to metering systems?

Connected metering systems should be protected by network segmentation, access control, encrypted communications, and regular security audits. Aramco and ADNOC both have cybersecurity standards for process control and metering systems. The flow computer's firmware and configuration should be change-controlled and backed up. Physical access to metering skids should be restricted and logged.