Home · Process Safety

🛢️ Process Safety Calculators

Two tools that close the loop on commissioning and storage compliance — hydrostatic / pneumatic test sizing, and bund containment capacity vs. tank volume.

45Pipe Pressure Test Hold (ASME B31.3)

Computes the hydrostatic test pressure (1.5 × design) and the hold-duration requirements per ASME B31.3 §345 / API 1110. Use for new piping commissioning and post-repair re-tests.

Design pressure P_D (bar gauge)

Test medium

Service class

Pipe nominal volume V (litres)

Ambient temperature swing during hold (°C)Larger swing → larger expected pressure variance from temperature alone.

Result

— bar test pressure

—

Required factor—

Min hold duration—

Allowable ΔP from temperature—

Stored energy (pneumatic only)—

Reference: ASME B31.3-2024 §345, API 1110, IOGP 510. Pneumatic test exclusion zones mandatory.

46Bunding / Spill Containment (EPA SPCC, API 650)

Verifies whether a tank bund / secondary containment can hold 110 % of the largest tank's volume plus a freeboard for rainfall. Used for fuel & oil storage, chemical day-tanks, hazardous-waste bunds.

Largest tank volume (m³)

Bund inside dimensions (m)

Footprint occupied by tanks / equipment (m²)

Design rainfall (mm in 24 h)

Standard

Result

— m³ effective capacity

—

Required capacity—

Rainfall allowance—

Surplus / shortfall—

Recommendation—

Reference: 40 CFR 112 (EPA SPCC), API 650-2020, UK CIRIA C736 / PPG 2. Drains: lock-closed valve required.