What material considerations prevent CO₂ pipeline embrittlement?
High-purity steels with controlled sulfur (<0.002%). Normalized processing ensures uniform microstructure. Charpy impact testing at -45°C validates toughness. Hardness limited to 22 HRC maximum. Special cleanliness controls during fabrication.
How are dense-phase CO₂ pipe welds qualified?
CTOD testing validates fracture resistance. Hydrogen cracking prevention procedures. 100% automated ultrasonic testing. Hardness mapping of heat-affected zones. Full-scale burst testing of prototype sections.
What design features prevent running fractures?
Fracture arrestors spaced per ASME B31.8. Increased wall thickness at high-consequence areas. Special valve arrangements for rapid isolation. Double-wall construction in sensitive areas. Real-time decompression monitoring.
How are carbon capture pipes commissioned?
Dewatering with oil-free air drying. Chemical cleaning removes mill scale. Nitrogen purging before CO₂ introduction. Gradual pressurization with pressure-hold steps. Final leak testing with laser detection systems.
What monitoring systems ensure pipeline integrity?
Distributed acoustic sensing for leak detection. Wall thickness monitoring with smart pigs. Corrosion coupon analysis. Ground movement monitoring. Annual EMAT inspections for crack detection.
