API RP 2A-WSD Anchor Capacity Spreadsheet (v3.2)

The API RP 2A-WSD Anchor Capacity Spreadsheet (v3.2) implements design methodologies outlined in API RP 2A-WSD Section 13 (Anchors and Mooring Systems) and aligns with supplemental guidance from DNV-RP-F205 (Mooring Analysis for Floating Structures) and ISO 19901-7 (Petroleum and natural gas industries — Offshore structures — Part 7: Metocean design and mapping). It employs both empirical and analytical approaches—such as the Randolph–Houlsby method for suction caissons, the Matsuoka–Nakai failure envelope for plate anchors, and the API-recommended drag anchor pullout models—to compute ultimate capacities, which are then reduced by load and resistance factors per WSD principles. The spreadsheet includes built-in validation checks (e.g., soil consistency verification, embedment depth-to-diameter ratios, and capacity interaction envelopes), automated unit conversion (SI and US customary), and sensitivity analysis features to evaluate parameter influence on anchor performance. It is widely adopted by marine renewable energy designers during conceptual and preliminary design phases to rapidly assess mooring feasibility, optimize anchor selection, and support geotechnical input requirements for site-specific foundation design reports.