Convex Flange

Product core advantages:

1. Beyond static sealing

Adaptive stress buffer: Compared with flat flanges or concave and convex flanges, which are prone to gaps when thermal expansion is inconsistent, it has strong adaptability! The convex design is like a "wedge". When the temperature and pressure change, it can more effectively convert the bolt load into the sealing surface pressure and absorb the slight deformation of the flange.

Key data: In the accelerated thermal cycle test of a university laboratory, under the same conditions, the gasket residual stress retention rate of Convex Flange is more than 35%, and the bolt load attenuation rate is 40%-60% lower than that of RF flange.

Key data: "In an application case, after replacing the RF flange of a critical vibrating pipeline with a Convex Flange, the number of leakage alarms dropped from an average of 3 times per year to less than 1 time, and the maintenance interval was extended by 300%."

2. Lightweight design

"Compact sealing design": When achieving the same sealing pressure level, raised face flanges can sometimes use thinner sections or smaller bolt circle diameters

Compared with ASME B16.5 Class 900 flanges, the optimized Convex Flange can reduce weight by about 10%-15% compared to the equivalent RF flange. ” This means lower material costs, more convenient transportation and on-site handling, especially for large flanges and space-constrained occasions

3. Thermal stress relief

The edges of flat flanges are more prone to warping. The convex design brings the sealing contact closer to the center of the flange, reducing the bending stress on the outer edge of the flange, which is particularly important under high temperature difference conditions.

Simulations show that the maximum bending stress of the Convex Flange flange ring is about 25-30% lower than that of the RF flange at 200°C, significantly reducing the risk of permanent deformation of the flange.

A large chemical plant uses Convex Flange on a high-temperature cracking unit. Compared with historical data, the frequency of bolt retightening has been reduced from once a quarter to once a year, and the average service life of the gasket has been extended from 18 months to 5 years.

4. Improve efficiency and reliability:

The contact between the convex surface and the matching concave surface/flat surface is a ring band, which has better tolerance for slight deviations in the parallelism of the flange surface and slight unevenness in the bolt preload.

On-site feedback from the installation contractor shows that in large flange installations, Convex Flange The first installation success rate is 15%-20% higher than that of RF flanges, and the rework rate is significantly reduced. "

The flanges we produce are not simple seals, but the cornerstone of system reliability

Consult our engineers to customize leak-proof solutions for your critical pipelines Request a Convex Flange vs RF flange performance comparison test report