What this pipe-sizing model assumes
This tool links volumetric flow, target velocity, and outer diameter with wall thickness to estimate required inner diameter and actual velocity. When published data is available, pick GB/T 17395-2024 dimensions from the catalog strip. Part of the piping preliminary design scenario chain.
Model assumptions
- Incompressible single-phase flow; density variations along the line are not modeled.
- Circular cross-section; wall thickness is uniform; no ovality or corrosion allowance stack-up beyond your entered thickness.
- Design mode uses Q and target v to suggest Di; verify mode uses measured Di to back-calculate Q at a test velocity.
- No fittings catalog, pump curves, or heat loss are included in this calculator.
References & further reading
- Published GB/T 17395-2024 pipe dimension rows (CommoditySpec read model) — browse at /tools/data/gbt17395.
- Continuity Q = vA for circular ducts; standard undergraduate fluid mechanics texts.
- Piping preliminary design scenario: /tools/scenarios/piping-prelim links pipe sizing → wall thickness → pressure drop.
Shareable URL
Use “Copy shareable link” below the grid. Query keys (SI): mode=design|test, Q (m³/s), v (m/s), vt (m/s), Do (m), t (m), odp=cn|iso. Engineering context may also include ecDo, ecT, ecP, ecS from scenario links. Re-open the link and press Calculate to refresh outputs.
Frequently asked questions
- Where does the GB/T 17395 dropdown data come from?
- From an audited CommoditySpec published in the workbench — not from OCR drafts or PDF scraping. See the provenance badge and /standards/coverage.
- Why do actual velocity and target velocity differ?
- Because the actual inner diameter is Do − 2t; the tool recomputes v from Q and that Di.
- Does this replace piping stress software?
- No. It is for hydraulic sizing/velocity checks only.
Extended copy on this page (headings, assumptions, references, FAQs) may be drafted or localized with AI assistance; engineering judgment and governing codes still apply. Numerical models run locally in your browser as implemented. For contract-critical work, cite primary standards and qualified review.