ASME B31.3 – Weld Acceptance Criteria (Process Piping) Visit weldfabworld.com In process piping under ASME B31.3, weld acceptance criteria are defined based on Fluid Service. The code specifies these limits in Table 341.3.2. Primary Visual Inspection Categories The three main categories used for visual inspection are: Category D Fluid Service Normal Fluid Service Severe Cyclic Conditions 1. Common Prohibitions (Applicable to All Fluid Services) Regardless of fluid category, the following weld im