Big Size Flange

Product Advantages Data Presentation

1. Higher Pressure Capacity

Big Size Flanges have a typical pressure range of > 100 Bar to > 250 Bar or higher, which is more than five times the pressure of standard flanges of the same grade. For example, the rated pressure of Class 900 flanges at DN600 is far higher than that of Class 150 flanges of the same size.

2. Significantly increased wall thickness and structural strength (Enhanced Structural Integrity):

Big Size Flanges have higher convex surfaces, thicker flange necks, and larger bolt holes, providing stronger resistance to vibration and bending.

Take ASME B16.5 DN600, Class 150 vs Class 900 RF flange as an example:

Flange thickness, Class 900: ~ 152.4 mm, Class 150: ~ 38.1 mm, Class 900 thickness is about 4 times that of Class 150.

Number of bolts Class 900 has 24 M36 bolts, Class 150 has only 20 M24 bolts

Bolt diameter increased by 50%, bolt quantity increased by 20%, and clamping force increased.

Class 900 flange bolt circle diameter increased by ~114.3 mm compared to Class 150 flange diameter, providing more bolt distribution space.

3. Very strong sealing performance

Larger sealing surface contact area, long-term zero leakage under high pressure and high temperature environment.

Higher bolts directly produce higher gasket sealing force.

The design leakage rate of the ring gasket of large-size flanges is usually required to be less than 10^-6 std cm³/sec He, which can achieve airtight sealing, which is much higher than the requirements of ordinary flanges for soft gaskets.

4. Customized requirements

This product requires customized requirements for non-standard sizes, materials and coatings. Longan specializes in this.

The size is far beyond the standard and requires customized processing.

Commonly used corrosion-resistant alloy materials: (such as Super Duplex 2507, Inconel 625/825, Monel, Hastelloy), the yield strength can reach > 600 MPa or more.

The thickness of special coatings can reach 250-500 μm, and the thickness of linings is 3-6mm, which can also be customized.

Finally, I would like to emphasize that Longan is a powerful factory specializing in the production of customized Big Size Flanges, which can fully meet all your imaginations of this product. Come and contact us, we are always welcome!