Flanges for Power Generation
High-temperature alloy steel solutions engineered for boiler systems, steam distribution, and cooling water in power plants with full ASME compliance.
Engineered for Extreme Heat & Pressure
Power generation demands uncompromising flange reliability. ApiFlange supplies high-temperature alloy steel flanges engineered for boiler systems, superheated steam, and cooling water in both fossil fuel and nuclear power plants. From moderate-temperature Class 150 flanges for cooling loops to ultra-high-temperature F91 flanges for supercritical steam systems, our expertise ensures safe, efficient power generation infrastructure with full ASME compliance and nuclear-grade certifications.
High-Temp Alloys
F11, F22, F91
Boiler Ready
1100°F+
ASME Code
Nuclear grade
Pressure Tested
1.5x rated
High-Temperature Alloy Materials
Power plant applications demand materials that retain strength at extreme temperatures. ApiFlange specializes in alloy steel flanges specifically engineered for superheated steam and high-temperature service.
Alloy Steel Grades
F5 (5Cr)
Max: to 1100°F | Elevated temp steam lines
F11 (1¼Cr)
Max: to 900°F | Boiler headers & risers
F22 (2¼Cr)
Max: to 1050°F | High-temp steam service
F91 (9Cr)
Max: to 1100°F | Supercritical systems
Compliance Standards
- ✓ASME B16.5 - Steel Flanges
- ✓ASME B16.47 - Large Bore
- ✓ASME Section I - Power Boilers
- ✓ASME Section VIII - Pressure Vessels
- ✓ASME Section III - Nuclear
- ✓ASTM A182 - Forged Alloy Steel
Power Plant Applications
Fossil Fuel Plants
- •Boiler tube headers
- •Steam superheaters
- •Reheater connections
- •Main steam lines
- •Hot reheat lines
Nuclear Plants
- •Reactor coolant loops
- •Steam generator nozzles
- •Pressurizer connections
- •Safety injection lines
- •Auxiliary systems
Cooling Systems
- •Cooling water headers
- •Condenser connections
- •Circulating water loops
- •Heat exchanger nozzles
- •Tower makeup lines
Pressure & Temperature Ratings
Power plant service combines extreme pressure and temperature. ASME Code Section I establishes rating relationships that decrease pressure capacity at elevated temperatures.
Design Pressures
600-1500 psi
All ASME classes
Design Temperatures
Up to 1100°F
F91 alloy rated
Service Factor
1.5x Testing
Pressure tested
All ApiFlange power generation flanges are supplied per ASME Code with complete pressure testing at 1.5 times the design pressure rating. Full mill test reports and ASME Code certificates of compliance are provided.
Quality & Certification
Power generation demands uncompromising quality. ApiFlange provides complete traceability and documentation for every flange.
Documentation
- •Mill test reports (MTTR)
- •ASME Code certificates
- •Material traceability
- •Pressure test documentation
- •Dimensional inspection records
Testing Services
- •Hydrostatic pressure testing
- •Mechanical property testing
- •Chemical composition analysis
- •Non-destructive inspection
- •Third-party certification
Planning Your Power Generation Project?
Our power plant specialists can help you select the appropriate alloy steel grade and pressure class for your boiler, steam, or cooling system application.