This application Piping Engineering Calculators for chemical, petrochemical, and any other process industry plant. A: Pipe Spacing Calculator. B: Allowable Design Pressure Calculator as per ASME B31. 3. C: Pipe Wall Thickness Calculator as per ASME B31. 3. D: Bend Wall Thickness Calculator as per ASME B31. 3. E: Branch Reinforcement Calculator as per ASME B31.