KuitunLarge-diameter flange

When pipe sizes exceed the load capacity of the workbench, you need large-diameter flanges. These flanges are forged from solid billets, with grain flow and pressure ratings identical to those of smaller flanges—except that the bolt-hole circle diameter is specified in meters rather than millimeters. Whether referred to as large-bore flanges, A-series necked weld-end flanges, or B-series blind flanges, their function remains consistent: to connect NPS 26 to 60 pipes without reducing the pressure rating.

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Kuitunflange

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Product Description

Large-diameter flanges—large bore, full rating, integral forging

When pipe sizes exceed the load capacity of the workbench, you need large-diameter flanges. These flanges are forged from solid billets, with grain flow and pressure ratings identical to those of smaller flanges—except that the bolt-hole circle diameter is specified in meters rather than millimeters. Whether they are referred to as large-bore flanges, A-series necked weld-end flanges, or B-series blind flanges, their function remains the same: to connect NPS 26 to 60 pipes without reducing the pressure rating.

Size concerns of buyers:

Project	Typical range
Nominal size	NPS 26 – 60 (DN 650 – DN 24,000)
Pressure rating	75–1500 pounds (PN 6–PN 25 0)
Series	ASME B16.47 Series A and Series B, HG/T20623-2009
Sealing surface	RF, FF, RTJ
Materials	A105, LF2, F304, F316L, F51 duplex stainless steel, and others.
Flange Type	WN, BL

Why choose a large-diameter flange?

Integral forging—no transverse welds, ensuring a continuous load-bearing cross-section.

A/B Series Options—Heavy-Duty or Light-Duty Designs with a Consistent Bolt-Hole Layout

Lower overall cost—by employing near-net-shape forming, the allowances for the outer diameter and sealing surfaces are ≤3 mm, reducing machining volume by 18%–25% compared with conventional plate-welded blanks.

Long-term operational value—under the same pressure rating, forged components weigh 8% to 12% less than plate-welded blanks, thereby reducing the load on supports and foundations.

On-site Installation Advantages

Overall forging eliminates longitudinal welds, thereby eliminating the need for additional weld inspection during lifting operations and saving on-site nondestructive testing time.

A 2-mm machining allowance has been provided for the bolt holes, enabling direct trial assembly with the matching flange and thereby reducing the need for secondary machining.