European Skid Manufacturer- European EPCC Contractor- Middle Eastern Blue Ammonia Plant:
For a major EPCC project, the client designed and delivered a redundant natural gas custody transfer skid. The skid was equipped with high-accuracy instrumentation — two 8-path ultrasonic flow meters, pressure and temperature transmitters, dual gas chromatographs (GCs), and flow computers. While the design concept was strong, the client required an independent verification that the skid configuration and operational schemes would meet stringent regulatory requirements of ≤1% overall uncertainty at 95% confidence level for custody transfer applications.
Key notes
- Industry: Oil & Gas (Custody Transfer / EPCC Project)
- System: Redundant natural gas skid with dual 8-path ultrasonic flow meters, P&T transmitters, dual GCs, and flow computers
- Impact: Verified <1% uncertainty at 95% confidence level; enabled compliance and regulatory acceptance
- Modeled four complete operational schemes with redundancy considerations.
- Verified compliance of the skid to 1% uncertainty at 95% confidence for custody transfer.
- Delivered transparent documentation demonstrating accuracy and reliability.
- Enabled smooth regulatory acceptance and end-user confidence in the metering solution
Engineerim was engaged to perform a rigorous measurement uncertainty analysis covering all critical components and operational scenarios. Our team:
Benchmarked results against regulatory and contractual custody transfer requirements.
Reviewed the full skid design including ultrasonic meters, pressure, temperature, dual GCs, and flow computers.
Identified and modeled four distinct operational schemes covering normal, redundant, and fallback operating conditions.
Applied detailed error modeling for each measurement element and combined uncertainty through ISO GUM methodology at 95% confidence level.
Through our comprehensive calculations, Engineerim confirmed that the redundant skid design satisfied the custody transfer requirement of ≤1% total uncertainty at 95% confidence level across all four operational schemes. Our detailed reporting provided the client with clear, defensible evidence of compliance — strengthening confidence in both the skid design and its acceptance by the end-user and regulators.
By leveraging Engineerim’s independent uncertainty analysis, the European skid manufacturer ensured that its natural gas custody transfer skid not only met but proved compliance with international standards. This gave the client an edge in delivering a regulator-ready, end-user-approved solution, reinforcing their reputation for technical excellence and reliability.
Engineerim provides independent, defensible measurement uncertainty validation for custody transfer systems, giving manufacturers and operators the assurance needed for regulatory compliance and commercial confidence.