Api Rp 586 _top_ Jun 2026

, titled "NDE Methods for Equipment Damage Mechanisms," is a newly developed American Petroleum Institute (API) recommended practice that provides technical guidance on selecting and using nondestructive evaluation (NDE) methods for detecting in-service damage in fixed equipment.

| Section | Title | Critical Content | |---------|-------|------------------| | 1 | Scope | Laser-based fugitive monitoring, not stack or indoor | | 3 | Terms & Definitions | MDLR, QOGI, DIAL, TDLAS, background, plume | | 6 | Performance Requirements | 5 g/hr MDL, ±50% accuracy, 5% false alarm max | | 7 | Instrument Specifications | Laser class, spectral range (3–5 µm or 8–12 µm for IR), wind sensor accuracy | | 8 | Measurement Procedure | Survey design, meteorology, leak rate calculation | | 9 | QA/QC | Daily zero/span, annual recertification, blind release test | | 10 | Reporting | Required fields and uncertainty statement | | 11 | Limitations | Environmental and physical constraints | | Annex A | Example Calculation | Step-by-step leak rate from QOGI data | api rp 586