Enter the design pressure for external pressure analysis. This should be a positive value, such as 14.7 psig. If you enter a zero in this field, the software does not determine the required thickness due to external pressure but will determine the External MAWP. For a skirt, you should not enter a value other than zero because there cannot be an external pressure on a skirt. External Pressure definitions are the same for PD 5500, ASME and EN 13445. Examples of External Pressure:
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0 - No External Pressure
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15 psig (0.1034 MPa) - Full Vacuum
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0.3 psig - Partial Vacuum