import type { ReliefValveInput, ReliefValveResult } from './types.js';
/**
 * Relief Valve Sizing — API 520 Simplified
 *
 * @formula
 *   - Gas: A = W / (C × Kd × P1 × Kb × Kc) × √(T×Z / M)
 *   - Liquid: A = Q / (Kd × Kw × Kc) × √(SG / ΔP)
 *   - Standard orifice selection per API 526
 *
 * @reference API 520 Part I (2020) — Sizing and Selection of Pressure-Relieving Devices
 * @reference API 526 (2017) — Flanged Steel Pressure-Relief Valves
 *
 * When the required area exceeds the largest API 526 orifice ('T', 16,774 mm²), the result
 * still reports 'T' as the closest standard size but sets `orificeExceedsMax: true` — a single
 * valve cannot provide the required capacity (multiple valves in parallel are needed). Callers
 * should surface this to the user; `percentUtilized` will be > 100 in that case.
 * `suggestedMinValves` gives the first-order parallel count (`ceil(requiredArea / T)`); an
 * actual multi-valve installation must be re-sized per API 520, since inlet and back-pressure
 * corrections change each valve's capacity.
 */
export declare function reliefValve(input: ReliefValveInput): ReliefValveResult;
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