Standards & Documentation

Governing design/construction code for the majority of the fleet; defines minimum shell thickness (UG-27) and allowable stress basis by material and temperature.

Used for: t-min calculation used for every remaining-life estimate in this app.

Higher-design-margin alternative to Div. 1, typically used for higher-pressure or more heavily optimized vessels.

Used for: Design code reference field on applicable vessels.

Source of allowable stress values by material specification and temperature, referenced by Section VIII.

Used for: Allowable stress lookup feeding the t-min formula.

The core in-service inspection code for pressure vessels — defines inspection intervals, remaining-life-based interval logic, and rerating requirements.

Used for: Reinspection interval logic (lesser of half remaining life or a 10-year cap) throughout the app.

Field inspection practices — CML selection, UT grid layout, visual inspection guidance.

Used for: Inspection method labels on thickness readings ("UT Grid (API 572)").

Companion inspection practice for fired equipment feeding into or heating pressure-vessel circuits.

Used for: Reference only — out of scope for the pressure-vessel asset class shown here.

Piping-specific companion to API 572, relevant where vessel nozzles transition to connected piping.

Used for: Reference for future piping asset-class expansion of this tool.

Governs inspection/testing of PRVs and rupture disks protecting the vessel.

Used for: Reference for future overpressure-protection module.

Definitive reference for damage-mechanism identification, susceptible materials/services, and appearance/morphology.

Used for: Every damage-mechanism classification, description, and inspection guidance shown on vessel detail pages.

Quantitative assessment procedures (Level 1–3) for equipment with known flaws or metal loss to determine continued fitness for service.

Used for: Would govern any vessel flagged Critical/High risk with a below-tmin reading — not yet implemented as a full FFS calculation engine in this concept.

Framework for likelihood × consequence risk assessment and risk-based inspection planning.

Used for: Structure of the Fleet Risk Matrix on the dashboard.

Quantitative RBI methodology — probability of failure and consequence-of-failure calculations.

Used for: Reference basis for a future quantitative POF/COF risk score upgrade.

Governs repairs, alterations, and jurisdictional reporting for pressure vessels post-construction.

Used for: Reference for repair/alteration workflows not yet modeled in this concept.

Federal requirement for mechanical integrity programs covering pressure vessels in covered processes.

Used for: Regulatory basis for maintaining a documented, auditable inspection program of the kind this tool supports.