Extreme Environment Simulation Systems / Geoscience & Subsurface Studies / Test Benches & Experimental Pilot Units
Mastering Carbonic Corrosion at 140 bar: Engineering a Hastelloy C-276 Characterization Rig
The challenge involved precise differential pressure measurement at very low flow rates within a corrosive environment (saltwater, CO2) at 130°C and 140 bar. Our engineering office designed and manufactured a test rig integrating Hastelloy C-276 diaphragm pressure sensors and a full Hastelloy C-276 hydraulic architecture with ball valves, ensuring integrity and measurement fidelity.
Alloy Degradation and Measurement Drift in Saline Carbonic Environments
Characterizing material permeability under CO2-laden water injection at 130°C and 140 bar presents a major physical constraint: accelerated corrosion of standard metallic alloys (e.g., 316 Stainless Steel).
Saltwater, combined with high temperature, promotes pitting and stress corrosion cracking on 316 SS, compromising the integrity of tubing and valves. CO2 dissolution in water forms carbonic acid, significantly increasing the medium’s aggressiveness and degradation kinetics.
This degradation generates particles that can impair the sealing of needle valves and introduce drift in differential pressure measurements, which is particularly critical at very low flow rates where stability and linearity are paramount. Standard catalog solutions fail to provide the integrated durability and precision required under these extreme conditions.
Hastelloy C-276 Hydraulic Architecture and High-Fidelity Instrumentation
To neutralize the aggressive environment and ensure measurement fidelity, our design philosophy focused on the systematic use of Hastelloy C-276 for all wetted surfaces.
This noble alloy offers exceptional resistance to chloride corrosion, carbonic acid, and other oxidizing agents.
Keller LEX1 pressure sensors, equipped with a Hastelloy C-276 diaphragm, provide 0.05% accuracy and intrinsic stability, essential for differential measurement.
The RS485 interface ensures robust digital data acquisition, minimizing interference.
The hydraulic architecture incorporates pneumatically actuated ball valves. Their design ensures superior metal-to-metal sealing and better tolerance to corrosion particles or impurities, unlike needle valves which are more susceptible to fouling. This configuration minimizes dead volumes and pressure losses, optimizing flow linearity at low rates.
Software control via LabVIEW and a Programmable Logic Controller (PLC) allows precise regulation of pressure and flow setpoints, as well as programming of sampling sequences, guaranteeing test repeatability and traceability.
Transposition to Geological CO2 Storage Studies and Energy Material Characterization
The mastery of HP/HT conditions and corrosive fluids developed for this carbonation rig is directly transferable to several industrial and research domains.
In the Oil & Gas and Geosciences sector, this engineering is fundamental for characterizing the permeability of reservoir rocks under representative well conditions (HP/HT, brines, CO2, H2S). Understanding the kinetics of mineral dissolution and precipitation in the presence of brines, CO2, or H2S under pressure and temperature is crucial for optimizing Enhanced Oil Recovery (EOR) and evaluating the safety and efficiency of geological CO2 storage sites (CCUS). Our ability to maintain fluid integrity and measurement precision allows for accurate modeling of long-term reservoir behavior.
For the energy sector, particularly CO2 capture and storage, as well as hydrogen technologies, our expertise enables the characterization and accelerated aging of materials and components. The evaluation of corrosion resistance of new alloys or polymers for CO2 transport and storage infrastructure, or the validation of the durability of valves and seals in the presence of hydrogen and impurities (H2S, CO2) under pressure, are direct applications. The reliability of our rigs ensures test repeatability and validation of critical equipment lifetimes.
Finally, in fine chemistry and materials science, this engineering is relevant for the development of synthesis or purification processes involving aggressive reagents under extreme operating conditions. The mastery of absolute sealing and chemical inertness of equipment is a prerequisite for ensuring the purity of finished products and the safety of operations, enabling the exploration of new synthesis pathways under previously inaccessible conditions.
Does your project require specific experimental conditions?
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