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Stainless steel formed components used to close the ends of pressure vessels or storage tanks may feature ellipsoidal, dished, hemispherical, or conical configurations. Their geometric shape and minimum post-forming thickness directly influence the vessel’s pressure-bearing capacity and service life.
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Executive Standard: GB/T 25198-2023 “Heads for Pressure Vessels.”
Type: Ellipsoidal, dished, hemispherical, spherical cap, or conical; selected according to design drawings.
Ordering Dimensions: Inner/outer diameter, nominal thickness, minimum post-forming thickness, straight flange height, total depth, and weld edge preparation (bevel).
Material: Stainless steel grade, plate standard, heat treatment condition, and intergranular corrosion requirements must be specified.
Inspection: Visual appearance, geometric dimensions, thickness, non-destructive testing (NDT), and quality documentation shall comply with vessel design specifications and the purchase order; pressure vessel heads are not subject to pipe fitting pressure class ratings.
Ordering/Acceptance: Based on approved drawings; verify head type, reference diameter, nominal/minimum post-forming thickness, straight flange, bevel, material, heat treatment, and NDT; check quality certificates and geometric deviations.
