Check Valves for Carbon Capture & Storage (CCS)
SS316L gate and globe valves for amine absorber CO₂ capture, Class 900 Duplex ball valves for supercritical CO₂ compression and transport, and NACE-compliant valves for CO₂ geological storage.
Which check valves are used for carbon capture & storage (ccs)?
Carbon capture and storage (CCS) plants handle CO₂ in multiple phases and conditions - lean and rich amine solvent at absorber and stripper (corrosive, 40–130°C), CO₂ gas at various pressures up to compressor outlet (150 bar), and supercritical CO₂ for pipeline transport and geological storage (> 73 bar). CO₂ with water forms carbonic acid (H₂CO₃) which attacks carbon steel; with H₂S it creates sour service requiring NACE MR0175 compliance. Vajra Industrial Solutions supplies the complete valve package for post-combustion capture, pre-combustion (IGCC), and direct air capture (DAC) applications.
Check Valve (CO₂ Compressor)
CO₂ compressor inter-stage and discharge back-flow prevention
Critical Requirements
- Wet CO₂ (CO₂ + H₂O) forms carbonic acid - attacks carbon steel at ppm level; SS316L mandatory for any wet CO₂ stream
- Sour CO₂ (CO₂ + H₂S) - NACE MR0175 compliance required if H₂S partial pressure exceeds 0.0003 MPa threshold
- Supercritical CO₂ seal compatibility - standard NBR/EPDM can swell and extrude in supercritical CO₂; only EPDM or HNBR grades specifically rated for CO₂ service
- ISO 15848-1 fugitive emissions Class B or better - CCS projects have regulatory pressure to demonstrate zero leakage
- Amine service valves - methyldiethanolamine (MDEA) and monoethanolamine (MEA) attack zinc and copper alloys; SS316L or WCB/SS316 trim only
- Fire-safe API 607 for all CO₂ compressor and injection valve service - CO₂ does not burn, but co-firing with H₂S is a fire hazard in sour CCS
Service Challenges
- Lean amine (MEA 30% or MDEA 40-50% + H₂O, 40–50°C) - mildly corrosive; SS316L preferred
- Rich amine (amine loaded with CO₂, 50–120°C) - more corrosive due to amine degradation products; Stellite trim for erosion at control valves
- Wet CO₂ gas (saturated with water) - carbonic acid H₂CO₃ at 3.5–4.5 pH; carbon steel unusable
- Supercritical CO₂ (> 73 bar, > 31°C) - dense, non-Newtonian fluid; excellent solvent for lubricants and elastomers; special seal selection required
- CO₂ + H₂S (sour CCS from natural gas or coal) - combined carbonic and sulfuric acid attack; NACE MR0175 Duplex 2205 or SS316L
Vajra Check Valves
Non-return valves to prevent backflow and protect equipment in piping systems.
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