“…NFTA 69 2 presents equations for calculating the design pressure for these two cases, based on an article by Noronha et al 16 The design pressure shall be calculated according to the following equations: For vessels fabricated of low-carbon steel and low-alloy stainless steel Fu = 4.0 and Fy = 2.0. The dimensionless ratio R is the ratio of the maximum deflagration pressure, in absolute pressure units, to the maximum initial pressure, in consistent absolute pressure units.…”