Metric & Imperial Conversions for Pipeline Operations
Understand SI unit system, conversion factors, and standard conditions
One psi equals 0.0689476 bar or 6.89476 kPa. These conversions are essential when working between US customary (psi, psig) and SI metric (bar, kPa, MPa) pressure units in international pipeline and process engineering projects.
US operations typically use MMSCFD (million standard cubic feet per day), while international projects use Sm³/d (standard cubic meters per day) or Nm³/h (normal cubic meters per hour). Conversion requires accounting for different standard temperature and pressure bases.
°F = (°C × 9/5) + 32 and °C = (°F − 32) × 5/9. For temperature differences used in heat transfer, 1°C difference equals 1.8°F difference. Absolute temperatures in Rankine (°R = °F + 459.67) and Kelvin (K = °C + 273.15) are used in gas law calculations.