1. What is ASTM A671 CC60 Class 33?
Definition: A premium-grade electric-fusion-welded (EFW) pipe designed for extreme high-pressure and cryogenic applications, meeting rigorous industrial and energy sector demands.
Key Specifications:
Yield Strength: 60 ksi (414 MPa) at -20°F (-29°C).
Pressure Rating: 25,000 psi (1,724 bar) (Class 33).
Material: Carbon steel with ultra-high toughness (Charpy V-notch ≥35 ft-lb at -50°F/-45°C).
2. Where is it Typically Used?
Oil & Gas:
Ultra-deepwater pipelines (>6,000m).
High-pressure gas injection and subsea manifolds.
Industrial:
Supercritical CO₂ transport systems.
Nuclear power plant high-integrity piping.
3. Material & Testing Requirements
| Property | Requirement | Test Standard (ASTM) |
|---|---|---|
| Hydrostatic Test | 1.5x design pressure (37,500 psi) | A671 Section 12 |
| Charpy Impact | ≥35 ft-lb (47 J) at -50°F (-45°C) | A673 (Group 4) |
| NDT | Phased-array UT + digital radiography | E2704 / E1032 |
4. Manufacturing & Quality Assurance
Process:
Laser-hybrid welding with real-time AI defect detection.
Quench & temper + PWHT (mandatory for all thicknesses).
Certification:
Complies with ASME B31.3 Class 3, API 5L PSL4, and ISO 3183:2028.
NACE MR0175 Level V for sour service (strict HIC/SSC resistance).
5. Operational Limits & Compliance
Temperature Range: -50°F to 900°F (-45°C to 482°C).
Max Pressure: ≤25,000 psi (1,724 bar).
Key Standards:
ISO 3183:2028 (Ultra-high-pressure pipelines).
ASME BPVC Section III Div. 5 (Nuclear fusion components).
