SAMPLE
Piping Toolset — Calculation Report
generated by calc-core · 2026-07-24

ASME B16.5 Flange Rating Calculator (Pressure–Temperature) — Sample Report

ProjectSample Project — Demonstration Only Job No.SAMPLE-001 Client—
CalculationASME B16.5 Flange Rating Calculator (Pressure–Temperature) Calc byPiping Toolset (calc-core) Checked byUNCHECKED — sample
Date2026-07-24 Rev0 BasisASME B16.5-2017 Tables II-2-1.1/2.1/2.2/2.3 + Section 2 interpolation (data embedded under ASME authorization)

1 · Design inputs

A Class 300, Group 1.1 (A105) flange on a hot-oil line at 450°F design, 500 psig design pressure. 450°F falls between table rows, so the rating is interpolated.

Material group1.1 (A105 forging)—
Class300—
Design temperature T450°F
Design pressure500psig

2 · Method

The lookup reads the B16.5-2017 U.S.-customary rating tables (Mandatory Appendix II) for the selected material group and class:

rating(T) = table value at T, or linear interpolation between the bracketing rows:
P(T) = Plo + (T − Tlo)/(Thi − Tlo) · (Phi − Plo)

utilization = Pdesign / rating    status = PASS if utilization ≤ 1

The −20-to-100°F row applies flat for T ≤ 100°F. Where the table shows no value — Class 150 above 1,000°F for the stainless groups, or any temperature above a group's last row — the flange is not rated and the check fails. Material sub-limits inside a group (A537 Cl.1 ≤700°F, A351 CF3 ≤800°F, 304L ≤800°F, the ≥0.04% carbon requirement above 1,000°F, the >800°F graphitization advisory for carbon steel) surface as warnings at the relevant temperatures.

3 · Calculation

  1. Bracket the temperature: the Group 1.1 Class 300 table gives 635 psig at 400°F and 605 psig at 500°F.
  2. Interpolate linearly (B16.5 Section 2): P = 635 + (450−400)/(500−400) · (605−635) = 635 − 15 = 620 psig.
  3. Screen the design pressure: utilization = 500 / 620 = 0.81 ≤ 1.

4 · Results PASS

Rating at 450°F620psig
Utilization P/rating0.81—

5 · Verification statement

The result values above are locked as fixture b165-rating.json, case “Group 1.1 Class 300 at 450F, design 500 psig -> 620 psig by interpolation, PASS”, tolerance 0.001, in the calc-core continuous verification gate (see https://pipingtoolset.com/trust/validation.html). Allowable-stress and factor data are user-supplied inputs; citations: ASME B16.5-2017, Mandatory Appendix II, Tables II-2-1.1 / II-2-2.1 / II-2-2.2 / II-2-2.3 (psig/°F) — rating values reproduced under ASME authorization (granted 2026-07-20, extended to B16.5 on 2026-07-24) · ASME B16.5-2017, Table 1A — material specification to group assignments · ASME B16.5-2017, Section 2 — pressure–temperature ratings and interpolation

SAMPLE REPORT — auto-generated from a verification fixture to show the report format. Not a project calculation. ⚠ Engineering-aid tool. Public code equations; allowable-stress and factor data are user-supplied. Results MUST be independently verified and reviewed by a qualified/licensed engineer before any design, fabrication, or operation decision.