As a key pressure-bearing equipment in industrial plants, the structural design of horizontal pressure vessels must not only meet the requirements of internal pressure resistance but also consider external load resistance. Internal pressure and external load act together on the vessel body, directly affecting the safety, stability, and service life of the equipment. Therefore, a comprehensive analysis of both is of great engineering significance.

From the perspective of internal pressure resistance, Horizontal Pressure Vessels primarily withstand hoop stress and axial stress generated by the pressure of the contained medium. The shell is the core pressure-bearing component, and its wall thickness, material strength, and manufacturing precision directly determine the vessel's pressure resistance. A reasonable wall thickness design balances strength requirements with economic considerations, and the choice of end cap type is equally crucial. Common elliptical and dished end caps exhibit relatively uniform stress distribution, helping to reduce local stress concentrations and improve overall internal pressure resistance.

In terms of external load resistance, Horizontal Pressure Vessels are subjected to more complex load forms, typically including self-weight, the weight of the internal medium, support reactions, and additional loads caused by external operating conditions. These external loads generate bending stress and shear stress on the vessel, which are particularly significant when the vessel span is large or the contained medium is heavy. A reasonable support structure design can effectively distribute external loads, reducing the risk of excessive local stress on the shell and thus improving overall structural stability.

Internal pressure resistance and external load resistance are not independent but rather superimposed and interact with each other in Horizontal Pressure Vessels. When internal pressure is high and external load conditions are complex, the vessel wall thickness, support locations, and shell stiffness all need to be considered comprehensively. By optimizing structural proportions and load paths, it is possible to enhance external load resistance while ensuring pressure resistance, preventing overall equipment safety from being compromised due to insufficient design in a single factor.

The structural reliability of a Horizontal Pressure Vessel depends on the balanced design of internal pressure and external load resistance. Only by systematically analyzing both operating conditions during the design phase can the equipment be ensured to operate stably for a long time in complex industrial environments, providing safe and reliable support for the production system.