One model. The full clause set. A report built for review.
Everything below is the product as it ships — named by the Code paragraph it runs, because that is how your work gets checked.
Model the vessel.
Shell courses, heads — 2:1 semi-elliptical, torispherical, hemispherical — and the full nozzle schedule, including hillside and offset nozzles. Supports: saddles, skirt, legs. One model carries geometry, materials, and design conditions together.
Section II-D allowables, built in.
Pick SA-516-70, SA-240, SA-106 — allowable stress comes from Section II-D at your design temperature, with the UCS-66 curve assignment carried automatically into the MDMT check. No side trips to the stress tables.
What each check verifies.
The same grid from the front page, expanded — one line of plain language per clause.
Required thickness of cylindrical and spherical shells under internal pressure.
Formed heads — required thickness and pressure on concave and convex sides.
External pressure and allowable compressive stress via the Section II-D factor A/B charts.
Nozzle reinforcement by area replacement — areas A1 through A5 inside the limits of reinforcement.
Minimum nozzle neck thickness, both pressure and standard-wall governs.
Flange design per Appendix 2 and ratings checks against B16.5 pressure–temperature tables.
MDMT and impact-test exemption, including the stress-ratio reduction of Fig. UCS-66.1.
Combined loadings — pressure with weight, wind, seismic, and liquid static head.
Hydrostatic test pressure at 1.3 × MAWP × lowest stress ratio, with test-condition stress checks.
Longitudinal and circumferential stresses for horizontal vessels on two saddle supports.
Local shell stresses at nozzles and attachments from external loads.
Fatigue screening — establishes whether full fatigue analysis is required.
UG-22 combinations in one pass.
Pressure with weight, wind per ASCE 7, seismic, and liquid static head — evaluated together, not as separate afterthoughts. Horizontal vessels get Zick analysis at the saddles; external nozzle loads get WRC 107/537 local stress checks.
Substituted values, cited paragraphs.
Formula, substitution, result, clause — on every line. MAWP and MDMT summary tables. Hydrotest pressures per UG-99. The format your checker follows fastest.
Report format shown — download the full sample below
Change once. Re-check everything.
Move a nozzle, change a material, add corrosion allowance — every dependent check re-runs and the report re-paginates. The calc package and the drawing revision stop drifting apart.
PDF out. Into the job file.
The complete, self-contained calc package exports as PDF — formatted for the job file and the Inspector's desk.