References
- GB 50316-2000 (2008 edition) §6.6.1 and Table 6.6.1.
- GB/T 150.2-2024 Table C ([σ]ᵗ for GB/T 150.3 mode;
/api/tools/gbt150-allowable-stress/*cascade). - GB/T 150.3-2024 §7.9 Eq. (7-40) and Table 7-9 items 1–8 (no chart or bolt formulas).
- ASME BPVC Section VIII Division 1 UG-34.
Model assumptions
- Elastic plate theory; outputs are estimates—qualified engineers must verify against the full code before fabrication or sign-off.
- GB 50316: K₁ and η from Table 6.6.1 geometry; optional GB/T 20801.1 Appendix B cascade for [σ]ᵗ (piping code family).
- GB/T 150.3 screening: Table 7-9 items 1–8 auto-compute K; optional Table C material classification cascade (standard → grade → condition → size + design temperature); manual if unpublished.
- GB/T 150.3: opening reinforcement not checked.
- ASME: circular plate with selected attachment factor C.
Shareable link
Use “Copy shareable link” below the table to encode SI inputs in the URL; open the link then click Calculate to refresh results. All math runs locally in your browser.
FAQ
- Is this the same as the blind-flange calculator?
- No. Blind plates between flanges (§6.7.2, 0.433 × d_G × sqrt(…)) are on /tools/blind-flange. This page is for flat covers / heads.
- How is [σ]ᵗ filled in GB modes?
- GB 50316: optional design temperature + GB/T 20801.1 Appendix B material category cascade (piping); you may override manually. GB/T 150.3: GB/T 150.2-2024 Table C via material classification (steel plate / steel pipe / forging / stud) → standard → grade → condition → size; not 20801 Appendix B; manual if unpublished.
- Why no bolted covers (Table 7-9 items 9–10)?
- Bolt load, gasket lever arm, and operating vs preload states are outside free screening scope. Select Custom K, or use professional vessel/piping design software.
- How do I get K from Table 7-10 / Fig. 7-23/7-24?
- This tool does not chart-lookup. Obtain K from the standard, choose Custom in the connection type, and enter it; formal design should use professional software.
- Is data uploaded?
- No—all local.
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.