Large Diameter Flanges: Custom Manufacturing Capabilities

Large diameter flanges (above 24″/DN600) require specialized manufacturing capabilities. SongHai produces custom flanges up to 4 meters for heavy-duty industrial applications.

What Defines a Large Flange?

• Standard Range: Up to 24″ (DN600) per ASME B16.5
• Large Diameter: 24″ to 48″ (DN600-DN1200)
• Extra Large: Above 48″ (DN1200+)
• Mega Flanges: 2 to 4 meters diameter

Applications for Large Flanges

• Oil & Gas: Pipeline manifolds, wellhead equipment
• Power Generation: Turbine connections, cooling systems
• Water Treatment: Pump stations, distribution mains
• Chemical: Reactor vessels, storage tanks
• Marine: Ship hull connections, offshore platforms

Manufacturing Challenges

Material Sourcing

Large forgings require specialized steel mills with heavy hammer capacity. SongHai partners with certified mills for plates up to 500mm thickness.

Machining Capability

CNC vertical lathes with 5-meter capacity ensure dimensional accuracy for large flanges. Surface finish Ra 3.2 or better on sealing faces.

Heat Treatment

In-house furnace handles solution annealing for stainless steel flanges up to 3 meters diameter.

Quality Testing

• Ultrasonic testing (UT) per ASTM A388
• Magnetic particle testing (MT) per ASTM E709
• Dimensional inspection with CMM
• Hydrostatic testing per ASME B16.5

SongHai Large Flange Capabilities

Parameter	Capability
Maximum Diameter	4000mm (4 meters)
Maximum Thickness	500mm
Maximum Weight	10 tons per piece
Materials	SS 304/316/321/347, Duplex, Carbon Steel
Standards	ASME, DIN, JIS, GOST, Custom