Classification of design errors in pressure vessels

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They are classified into six categories according to the nature of the error: major technical issues, technical issues, general issues, drawing-related issues, process control issues, and design verification issues. 1. Major technical issues: After pressure vessels are put into use, there may be safety-threatening defects, or design flaws that can result in significant economic losses. 1.1 Incorrect classification of pressure vessel categories ； 1.2 Errors in the calculation of the strength or stiffness of the main stressed components, or serious discrepancies between the design parameters and data in the drawings and those in the calculation documents ； 1.3 Incorrect selection of materials for key compression components ； 1.4 Omissions or errors in important technical requirements ； 1.5 Errors in the structural design of key compression members ； 1.6 Other issues that pose significant safety hazards. 2. Technical issues: Failure to comply with design regulations, standards, and specifications, resulting in certain safety hazards or significant waste. 2.1 Incorrect or missing design parameters ； 2.2 Classifying non-pressure vessels as pressure vessels governed by the “Solid Vessel Regulations” ； Or containers that meet the criteria for a certain “fixed capacity category,” but are classified in a too high category ； 2.3 The design outputs (drawings and other design documents) do not meet the requirements of the design inputs ； 2.4 Incorrect selection of materials for compressed components, as well as standards and types for compressed parts, resulting in significant waste ； 2.5 Incorrect selection or omission of technical requirements for containers or pressure components ； 2.6 Incorrect selection of container or pressure component structure ； 2.7 Errors or omissions in strength calculations ； 2.8 Error in pattern size or data. 3. General issues: Such errors refer to those that do not pose safety hazards or represent significant waste. 3.1 Conflict between assembly dimensions and component dimensions ； 3.2 Some dimensions of the components are inconsistent with other dimension or angle data ； 3.3 Projection error, but not severe enough to cause serious consequences ； 3.4 The total error for general components is <15% ； 3.5 Incorrect selection or omission of dimensional tolerances, form and position tolerances, and surface roughness specifications ； 3.6 Flange bolt holes are not arranged at the mid-span ； 3.7 Incorrect determination of the flange sealing surface on the equipment side ； 3.8 Incorrect orientation of pipe ends or supports, or missing items ； 3.9 Omissions regarding surface treatment of pressure vessels and requirements for spare parts. 4. Graphic issues: Errors related to drawing, representation methods, spelling mistakes, and other general graphic problems. 4.1 The representation methods of sectional views and node diagrams do not meet the requirements of drawing standards ； 4.2 Linear error of the contour line ； 4.4 Incorrect text height, dimension sizes, and pipe end symbols ； 4.5 Incorrect part number ； 4.3 Typos and incorrect English translations, but not to the extent that they cause misunderstandings.