Bi-Directional Provers
Flow meter proving for custody transfer and allocation metering
Traceable Meter Calibration
Bi-directional pipe provers provide a traceable reference volume for calibrating flow meters under actual process conditions. By displacing a known volume of fluid through the meter at operating temperature and pressure, provers establish a meter factor that corrects for real-world conditions — something laboratory calibration alone cannot achieve.
Provers can be supplied as standalone skid-mounted units or integrated into complete LACT/ACT systems. Design and key components are sourced from Louisiana, USA, with local fabrication for larger assemblies to ensure rapid delivery and high quality.
Key Features
National Standards Traceable
Prover volume certified and traceable to national measurement standards via water draw calibration.
In-Situ Proving
Prove meters under actual operating conditions — at process temperature, pressure, and flow rate — for the most accurate meter factors.
Bi-Directional Operation
Sphere travels in both directions, providing two proving runs per cycle for faster calibration and better repeatability.
API Compliant
Designed per API MPMS Chapter 4 (Proving Systems) and Chapter 12 (Calculation of Petroleum Quantities).
Flexible Integration
Supplied standalone on a separate skid or integrated directly into LACT/ACT metering systems.
Range of Sizes
Available from 2" through 16" and larger to match the flow range and meter size of the installation.
Technical Specifications
| Type | Bi-directional pipe prover |
| Sizes | 2" to 16" (larger on request) |
| Pressure Ratings | ANSI 150, 300, 600, 900 |
| Design Temperature | −29°C to +150°C |
| Materials | Carbon steel, stainless steel |
| Calibration | Water draw traceable to national standards |
| Repeatability | ≤ 0.02% on 5 consecutive runs |
| Standards | API MPMS Chapter 4, Chapter 12 |
Applications
LACT / ACT Systems
Integrated proving within custody transfer units for regular meter verification without interrupting operations.
Pipeline Metering Stations
Dedicated prover skids serving multiple meter runs at pipeline custody transfer and allocation points.
Terminal Metering
Proving meters at storage terminals and loading facilities to maintain fiscal accuracy for custody transfer.
Offshore Platforms
Compact provers for offshore metering stations where space is limited but fiscal accuracy is critical.
Specify Your Prover
Provide your meter type, flow rates, line size, and pressure rating and we will design a prover to match your installation requirements.
