The Silent Force: Managing Thermal Growth
When a pipeline transports hot media like steam or chemicals, the steel expands. For a 100-meter pipe, a 100°C temperature increase can cause over 100mm of growth. Without a Bellows Expansion Joint, this force would destroy fixed anchors or bend the pipe. B-NAI’s axial compensators provide the necessary “spring” to absorb this growth safely.
1. Multi-Ply Bellows: Why More Layers are Better?
At B-NAI, we often utilize multi-ply bellows construction. Instead of one thick wall of stainless steel, we use multiple thin layers.
Flexibility vs. Pressure: Multi-ply designs offer the same pressure rating as a thick single-wall joint but with much lower spring rates. This means less stress is transferred to your equipment, and the bellows can survive significantly more cycles (fatigue life).
2. Material Engineering for Harsh Environments
We select materials based on your specific media:
SS304: Standard for clean water and air.
SS316L: Superior for corrosive environments and chemical lines.
SS321: Enhanced with titanium for high-temperature stability, preventing intergranular corrosion in steam systems.
3. Critical Components: Internal Sleeves and Limit Rods
To ensure long-term reliability, B-NAI expansion joints can be customized with:
Internal Sleeves (Liners): These smooth out the flow, preventing erosion of the bellows convolutions and reducing turbulence-induced noise.
Shipping Bolts/Limit Rods: These maintain the correct installation length and prevent the bellows from over-extending during pressure testing or operation.
