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General-purpose tools are free and run locally in your browser. Pro calculation tools include a demo preset; unlock full features per product in Digital assets.
Pipe sizing, wall thickness, branch reinforcement, weight, fitting mass, flange bolting, and valve flow coefficients — GB/T and ASME screening tools.
Free online: GB/T 12459 & ASME B16.9 butt-weld fitting mass; wide DN/NPS; carbon/stainless schedules or custom OD/wall.
Free online: mass from OD, wall thickness, length and density; browser-local spot checks.
Free online: GB/T 17395 OD, GB/T 20801.1 appendix B allowable stress; metal/non-metal straight-pipe wall thickness & Sch screening (GB/ASME).
Free online: volumetric flow, target velocity, pipe inner diameter and wall thickness; design/test modes.
Free online: GB/T 9125, EN, or ASME axial stack for bolt/stud nominal length; flange, gasket, nut and washer inputs.
Free online: valve Kv from flow rate, pressure drop and specific gravity; turbulent screening.
Free online ASME B31.3 area reinforcement for set-on branches; design pressure, OD and wall thickness; oblique angle and multi-opening screening.
