Pressure vessels must be designed to withstand wind-induced forces

Part UG-22 of Section VIII of the ASME Boiler and Pressure Vessel Code says that vessel designers must account for any expected loads on a vessel, in addition to the internal and external pressure loadings you might expect.

One of these potential loads is wind.

In pressure vessel design, wind loads refer to the forces generated by wind acting on the vessel and its supporting structures. These loads can impact the structural integrity and stability of the pressure vessel and must be considered during the design process to ensure the vessel can withstand the effects of wind events. Wind loading can be a significant external force on pressure vessels, especially if the vessel is located in a coastal area with potential occasional hurricane-force winds.

Here are some key points to consider when addressing wind loads in pressure vessel design:

Wind load calculation. The first step is to calculate the wind loads that the pressure vessel will experience during windy conditions. Wind loads are typically determined based on the local wind speed, the vessel’s dimensions and its dynamic response characteristics.

Wind design codes. Design codes and standards, such as the American Society of Civil Engineers 7 or Eurocode 1, provide guidelines for calculating wind loads on structures, including pressure vessels. These codes take into account factors such as wind speed, terrain, building height and exposure to determine the appropriate wind load.

Wind load distribution. Wind loads are typically distributed across the pressure vessel, and its supports according to the vessel’s geometry and orientation relative to the wind direction. These loads can act both horizontally and vertically on the vessel.

Dynamic analysis. Similar to seismic forces, dynamic analysis may be required to assess how the pressure vessel and its supports respond to wind loads. This analysis helps determine whether the vessel’s design can withstand the wind-induced forces without compromising its structural integrity.

Support design. The supports and foundations of the pressure vessel must be designed to withstand wind loads. This involves ensuring that the supports have sufficient strength and rigidity to withstand the forces generated by wind. The dynamic effects of wind-induced vibrations on supports should also be considered.

Material selection. The material used for constructing the pressure vessel must have the required strength and flexibility to withstand the deformation and stress caused by wind loads. The material’s resistance to fatigue and wind-induced vibrations is important.

Aerodynamic considerations. The shape and profile of the pressure vessel can influence its interaction with the wind. Design features that reduce drag and wind turbulence can help mitigate wind loads and vibrations.

Wind breaks and shielding. Depending on the location and surroundings, the pressure vessel’s exposure to wind can be mitigated through the use of wind breaks, barriers or shielding structures. These measures can help reduce wind loads and their potential impact.

Testing and verification. Prototype testing or simulations can be conducted to verify the response of the pressure vessel to wind loads. This may involve wind tunnel testing or computational fluid dynamics simulations to assess the vessel’s behavior under different wind conditions.

Code compliance. Ensure that the design of the pressure vessel and its supports adhere to relevant design codes and standards that address wind loads. These codes provide specific guidelines and factors to consider when designing for wind-induced forces.

Considering wind loads in pressure vessel design is essential to ensure the vessel’s structural integrity and safety during various environmental conditions. Collaboration between structural engineers, wind engineers and mechanical engineers is crucial to creating a design that can withstand both static and dynamic wind loads.

Ward Vessel and Exchanger specializes in custom design, engineering and fabrication of process equipment for chemical processing and related industries.

For more information, visit wardvesselandexchanger.com or call (704) 568-3001.