December 2007

Safety/Environement

Designing for pressure releases during fires—Part 2

Wetted equipment requires a different calculation approach for fire relief loads

Norouzi, S., Sazeh Consultants, Engineering and Construction; Rahimi Mofrad, S., Petrofac Engineering & Constructions

One of the most important situations that lead to equipment overpressure is subjecting it to an external fire. The American Petroleum Institute (API) standard, API-521 section 3.15,1 recommends the basic theory and formulas for calculating vapor rates generated during a fire due to liquid vaporization or gas expansion for wetted and unwetted vessels, respectively. In Part 1, a calculation procedure was presented to find whether a vessel is categorized as wetted or unwetted before beginning the fire relief rate calculation. This portion reviews the different strategies that are being used for relief rate calculations of wetted vessels in fire conditions and introduces a new simple method fo

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