1. What is ASTM A671 CC60 Class 13?
Definition: A mid-range pressure EFW pipe for low-temperature service, balancing cost-efficiency and cryogenic performance.
Key Specs:
Yield Strength: 60 ksi (414 MPa) at -20°F (-29°C).
Pressure Rating: 2,500 psi (172 bar) (Class 13).
Material: Carbon steel with Charpy V-notch impact testing for brittle fracture resistance.
2. Typical Applications
Oil & Gas:
Low-pressure gas gathering systems.
Cryogenic storage ancillary piping.
Industrial:
Ammonia/CO₂ refrigeration systems.
Chemical processing auxiliary lines.
3. Technical Requirements
| Property | Standard Requirement | Test Method (ASTM) |
|---|---|---|
| Hydrostatic Test | 1.5x design pressure (3,750 psi) | A671 Sec.12 |
| Charpy Impact | ≥20 ft-lb @ -50°F (-45°C) | A673 (Group 2+) |
| NDT | 100% radiography or UT | E94 / E213 |
4. Manufacturing & QA
Process:
Double-submerged arc welding (DSAW).
Optional PWHT for stress relief.
Certification:
Complies with ASME B31.3 and API 5L PSL1.
Optional NACE MR0175 for sour gas service.
5. Operational Guidelines
Temp Range: -50°F to 650°F (-45°C to 343°C).
Max Pressure: ≤2,500 psi (172 bar).
Key Standards:
ISO 3183 (Pipeline systems).
ASME B31.3 (Process piping).
