Calculation basis: ASME BPVC VIII-2, 2019 / 2021 / 2023 · configuration scope checked against 2025 B16 publications

Flange Capacity Explorer

Engineering screening for standard-rated and compact flanges under pressure, tensile axial load, and net-section bending moment.

Within screening scope

Standard rated-flange screening using ASME B16.5/B16.47 references, material derating, and external-load interaction.

Standard Flange NPS 4 / Class 300

Exact implemented configurations only. Unsupported size/class combinations are not substituted.

Capacity Snapshot 0.00
Pressure rating 740 psi
Operating pressure 481 psi
Material allowable at temperature 20 ksi
Bolt allowable at temperature 25 ksi
Allowable pressure at current external loads 0 psi
Remaining axial capacity at current pressure and moment 0 kip
Remaining bending capacity at current pressure and axial load 0 kip-ft
Stress State screening
General Flange Set Dimensions approx.
Qualification Basis screening
Project evidence gate

Qualification Readiness

Screening only

ASME lists a 2025 BPVC VIII-2 edition. This calculator currently implements only the supplied 2019, 2021, and 2023 source basis. A checkbox is not objective evidence: each assertion also requires a drawing, MTR, procedure, calculation, test, or review reference.

0 of 0 project evidence items confirmed Completion does not constitute certification.
Standard vs Compact Profile NPS 4 / Class 300

Half cross-sections drawn to a common scale. Standard dimensions are generated screening estimates; compact dimensions are catalog values. Verify against controlled tables before design use.

Standard Class Comparison same NPS and pressure fraction
Conceptual Load Model illustrative — not FEA output
pressure-energized metal ring seal contact band blue pressure arrows: internal pressure red external load + moment A C OD BCD low stress high stress Conceptual stress contour; dimensions approximate for screening
Downloadable Calculation Set MathJax report

The downloadable report captures the current input state, derived constants, governing equations used by this prototype, pass/fail checks, assumptions, and objective evidence needed for independent review.

  1. Open the report in a browser to review the rendered math notation.
  2. Print or save the report to PDF for the formal calculation file.
  3. Attach controlled ASME tables, material certificates, gasket data, and bolt data before certification.
Edition Notes 2023 basis

    Derived Calculation Basis from supplied PDFs
    1. 4.16 evaluates operating and gasket seating conditions.
    2. External tensile axial force and net-section bending moment are included with pressure end load effects.
    3. Strength and flange rotation rigidity checks both govern custom flange designs.
    4. Standard ASME B16.5/B16.47 selections are constrained to the implemented publication scope; unsupported classes remain unavailable until controlled rating data are loaded.
    5. FlangeTec® compact flanges require an exact supplied catalog row; nearest-size or nearest-class substitution is prohibited.
    Agent Access structured and unit-explicit

    Automated clients can read the live normalized state from #agentCalculationState or use the static manifest and JSON Schema. A screening pass must never be interpreted as certification, approval, or Code compliance.

    Agent manifest Snapshot schema Source register LLM guidance