In the design process of stainless steel pressure vessels, strength calculation constitutes the core element for ensuring the safe operation of the equipment. A sound strength design not only prevents the vessel from rupturing or deforming during operation but also effectively extends its service life and mitigates operational risks.

Strength calculations are typically based on relevant design standards, such as the GB 150 or ASME codes. Prior to design, key parameters—including the vessel's operating pressure, design temperature, fluid properties, and corrosion allowance—must be clearly defined. Concurrently, the yield strength, tensile strength, and allowable stress of the stainless steel material serve as critical inputs for these calculations.

As the primary pressure-bearing component of a pressure vessel, the shell requires a thickness calculation of paramount importance. Typically, depending on whether the vessel is subject to internal or external pressure, the thin-walled cylinder formula is employed for this calculation. Under internal pressure, hoop stress acts as the primary governing factor; the required wall thickness is calculated via formula and subsequently adjusted using a weld joint efficiency factor to ensure structural safety and reliability.

Vessel heads come in various forms—such as elliptical or torispherical heads—each requiring a distinct calculation methodology. During the design phase, strength verification of the heads is mandatory to ensure they remain stable and do not buckle under pressure. Furthermore, areas containing nozzles and openings are prone to stress concentration; consequently, localized reinforcement calculations are required for these regions to prevent the initiation of cracks or fatigue failure.

For vessels subject to external pressure or operating under vacuum conditions, stability analysis is also essential to prevent buckling and deformation. Additionally, at critical junctures such as supports and flange connections, the impact of localized stresses must be taken into account, and the structural design should be further optimized using methods such as Finite Element Analysis (FEA).

Upon completing the fundamental strength calculations, designers must perform a final verification incorporating appropriate safety factors to ensure full compliance with regulatory codes. Simultaneously, by optimizing structural dimensions and material utilization, a balance between safety and economic efficiency is achieved.

The strength calculation for stainless steel pressure vessels encompasses multiple facets, necessitating a comprehensive consideration of material properties, structural configurations, and operating conditions. Scientifically sound and rational calculation methods serve as the fundamental basis for ensuring the safe and efficient operation of the equipment. Throughout the relevant design and manufacturing processes, FRHE prioritizes adherence to regulatory codes for strength verification and structural optimization; by aligning material selection and parameter design with actual operating conditions, we not only satisfy all safety requirements but also significantly enhance the operational stability and reliability of the equipment.