Structural Characteristics and Application Scenarios of Rigid Beams
Category: Company News
Time: 2025-03-15
A rigid beam is a supporting structure attached to the outer wall of a shell—such as a boiler drum, flue, or dust collector—and secured to the shell by welding or bolting, thereby forming a “shell–rigid beam” composite structure that enhances the overall resistance to deformation.
A rigid beam is a supporting structure attached to the outer wall of a shell—such as a boiler drum, flue, or dust collector—and secured to the shell by welding or bolting, thereby forming a “shell–rigid beam” composite structure that enhances the overall resistance to deformation.
2. Structural Features
Materials: Typically fabricated by welding structural steel sections—such as angle steel, channel steel, and I-beams—or steel plates, offering high strength and excellent stiffness.
Form:
Circumferential stiffening beams: arranged along the equipment’s circumferential direction, primarily resisting hoop stresses and local deformations.
Axial stiffening beams: Arranged along the equipment’s axial direction (heightwise) to support vertical loads or enhance overall structural stability.
Grid‑type rigid beams: composed of circumferential and axial beams arranged in a grid structure, they are suitable for large‑diameter or complex‑shaped shells, providing all‑directional support.
Core Functions and Roles
1. Preventing shell instability
When a structure is subjected to external pressure—such as the negative pressure in a boiler flue or the external pressure acting on a pressure vessel—the shell may experience buckling instability due to insufficient stiffness, manifesting as local dimpling or wrinkling. Rigid beams mitigate this by constraining the shell’s deformation and redistributing the external pressure load along their length, thereby preventing instability.
2. Load-bearing and Force Transmission
It bears the weight of equipment ancillary components (such as piping, insulation, and platforms), as well as external loads like wind and seismic loads, and transmits these loads to the equipment support structure or foundation.
3. Maintain structural shape
For large thin-walled shells (such as boiler furnace chambers and chimneys), rigid beams can maintain their geometric shape, preventing deformation caused by thermal expansion and contraction or pressure fluctuations, thereby ensuring normal equipment operation.
Typical application scenarios
1. Boiler System
Furnace rigid beams: Arranged on the outer side of the boiler waterwalls, they resist fluctuations in combustion pressure within the furnace (such as deflagration impacts) and negative-pressure suction, while also supporting the weight of the waterwall tube assemblies and the insulation layer.
Flue gas duct stiffening beams: installed on the outer wall of the boiler’s rear flue to prevent collapse caused by negative pressure (draft from the induced draft fan), while also supporting the loads of the heating surfaces inside the flue, such as the economizer and air preheater.
2. Pressure Vessels and Storage Tanks
For the shell or heads of large storage tanks—such as LNG tanks and oil tanks—rigid beams can enhance structural safety by resisting external atmospheric pressure and fluctuations in internal process pressures, particularly when localized pressures act on the tank’s top or bottom.
3. Industrial Piping and Chimneys
Large-diameter pipelines (such as steam lines and dust‑removal ducts) or tall chimneys are supported by rigid beams to reduce vibration, resist wind loads, and prevent pipeline deformation or chimney toppling.
Keywords: Structural Characteristics and Application Scenarios of Rigid Beams
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