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Multilingual engineering calculation tools—general tools free, 100% local—with optional pro calculation tools and per-product digital assets (audited TSV + provenance JSON, not standard PDFs).
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.
Free online IAPWS-IF97: saturation, superheat, subcooled water; thermodynamic and transport properties.
Free online: high-precision engineering unit conversion with legacy heat-transfer and SI categories.
Free online: multi-fluid thermodynamic & transport properties via CoolProp (HEOS + incompressible); single-point free, batch Excel uses platform credits.
Free online: GB 50316 §6.6.1, GB/T 150.3 Table 7-9 items 1–8 plus custom K, ASME UG-34 flat cover thickness—not blind plates between flanges (§6.7.2).
Free online: GB/T 12459 & ASME B16.9 butt-weld fitting mass; wide DN/NPS; carbon/stainless schedules or custom OD/wall.
Free online: GB 50316-2000 (2008) §6.7.2 blind plate between flanges or ASME VIII UG-34. Not flat covers (§6.6.1).
Free online: Obana (1982) Ch.9 fouling extrapolation and flow/diameter correction; exponential model.
Free online: Crane TP-410 style K factors for valves and fittings; L/D tables scaled to pipe ID.
Beyond free general calculation tools: credit packs, pro calculation tool SKUs, and structured data packs. Browse and preview the catalog; full downloads and pro unlocks require sign-in and a one-time purchase per SKU (not standard PDFs).
The following capabilities underpin free general calculation tools, pro calculation tool SKUs, and audited digital asset bundles—from engineering formulas to verifiable structured data.
Personally maintained: standards-based tables and geometry become verifiable structured read models. General calculation tools stay free; pro calculation tools and digital asset bundles are sold separately at /metadata.
The maintainer has 25+ years of experience in piping design and hydrometallurgical process design, and has contributed to national and industry standard development. Read models and calculation tools on this site trace back to engineering practice and publicly available standard texts; they do not imply endorsement by any standards body.
Focused on free general calculation tools, optional pro calculation tool SKUs, and curated digital assets; deep consulting by invitation only.
