Large Diameter Flanges

Large Diameter Flanges: What Buyers Need to Know

Large diameter flanges are widely used in water transmission, energy, petrochemical, desalination and heavy industrial projects.

Compared with standard flanges, large diameter flanges require greater attention to machining accuracy, flatness, drilling and transportation.

Common Applications

Large diameter flanges are used in:

• Water treatment plants
• Desalination systems
• Pump stations
• Steel plants
• Power plants
• Petrochemical facilities
• Large industrial pipelines

Common Standards

Depending on the project, large diameter flanges may be manufactured according to:

• ASME B16.47
• EN 1092-1
• DIN
• AWWA C207
• Customer-specific drawings

ASME B16.47 is commonly referenced for large-diameter steel flanges, while EN 1092-1 is widely used in European piping systems.

Typical Large Diameter Sizes

Depending on manufacturing capability, suppliers may produce:

DN1000, DN1200, DN1400, DN1500, DN1800, DN2000 and larger.

Custom sizes can also be manufactured according to drawings.

Key Quality Control Points

For large flanges, buyers should pay particular attention to:

Outer Diameter

The OD must meet drawing and standard requirements.

Bolt Hole Pattern

Incorrect bolt-hole positioning can prevent installation.

Thickness

Thickness should be controlled during forging, rolling and machining.

Flatness

Flange face flatness directly affects gasket sealing.

Surface Finish

The sealing surface should meet the specified requirements.

Why Choose an Experienced Large Flange Manufacturer?

Large-diameter products require:

• Large machining equipment
• CNC drilling
• Experienced operators
• Dimensional inspection
• Appropriate lifting equipment
• Professional export packing

For project orders, customers should request dimensional inspection records and material traceability.

 

Looking for large diameter flanges? Contact us with your drawing, DN, pressure class and material.