Why not use handbook nominal mass only?

Nominal mass is also approximate; dims × density stays explainable, covers non-standard parts, and prepares for future packs.

Can results be used for purchasing settlement?

No. Results are engineering screening only; contracts and weighbridge/certificates govern settlement.

Which standards are supported now?

Pack autofill currently maps to HG/T 20592—2009 for pipe Series A (series I) only. HG flanges have Series A/B only (no Series C/III); Series B, GB, and ASME will follow. Without a pack, pick a flange category and enter critical dimensions for volume × density.

Flange weight calculator — HG/T 20592—2009 / manual

What the mass number on this page means

Workflow: standard family → flange selection (1 category → 2 pipe series → 3 pressure → 4 nominal size → 5 face) → apply dims → calculate. Pack autofill today maps to HG/T 20592—2009 (critical dims from the 2015-03-27 reviewed mass workbook). HG flanges use pipe Series A/B only (series I/II — no series III); the published pack covers Series A (series I) OD only, with Series B to follow. GB and ASME packs will follow—until then choose a category and enter critical dimensions for volume × density. Results are engineering screening values, not catalogue or weighbridge figures. Default density 7850 kg/m³, editable. Orifice flanges are out of scope.

References and further reading

Type-specific volume models align with the HG/T 20592—2009-family flange mass estimation workbook (2015-03-27 reviewed).
Fastener length: /tools/flange-fastener. Blind stress thickness: /tools/blind-flange (separate duties).
Published pack: flange-mass-dims.hgt20592_workbook.v1 (HG/T 20592—2009 geometry, pipe Series A / series I; workbench). HG Series B and GB/ASME packs planned.

Model assumptions

Axisymmetric geometry; bolt holes deducted as cylinders; no draft, ovality, or machining allowance.
Single user density; no temperature correction or alloy mixing law.
The published pack maps to HG/T 20592—2009 (rows from the 2015-03-27 reviewed mass workbook) with pipe OD for Series A (series I) only. HG flanges have Series A/B (I/II) only — no Series C/III; Series B and GB/ASME packs are not published yet. Geometry estimates may differ from vendor mass—engineering screening only.

This tool does not encode parameters in the URL yet; bookmark the localized path if needed. All calculations run locally in the browser.

FAQ

Why not use handbook nominal mass only?: Nominal mass is also approximate; dims × density stays explainable, covers non-standard parts, and prepares for future packs.
Can results be used for purchasing settlement?: No. Results are engineering screening only; contracts and weighbridge/certificates govern settlement.
Which standards are supported now?: Pack autofill currently maps to HG/T 20592—2009 for pipe Series A (series I) only. HG flanges have Series A/B only (no Series C/III); Series B, GB, and ASME will follow. Without a pack, pick a flange category and enter critical dimensions for volume × density.

Extended copy on this page (headings, references, assumptions, 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.