Methods for locating portable buildings for explosion hazards

Three zones have been established for sitting portable buildings based on external vapor cloud explosions (Figure 1).  These zones are defined by standoff distances as a function of congested volume. Congestion volume being the volume of congestion that is calculated by considering the size (perimeter boundary and height) of the congestion.  

The following requirements apply to sitting portable buildings near congested volumes from 7,500 to 1,000,000 cubic ft using figure 1:

• Zone 1: Light wood trailers intended for occupancy shall not be located within Zone 1 under any circumstances.   All portable buildings intended for occupancy other than light wood trailers require a Detailed Analysis and may house only essential personnel.

• Zone 2: Sitting of all portable buildings intended for occupancy including light wood trailers requires a Detailed Analysis

• Zone 3: Any portable building can normally be located in Zone 3

Figure 1 – Portable Buildings Location Guidance

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Sitting Portable Structures