COMPRESS provides a user input for the wind force coefficient Cf to be applied to the shell; this value will be used when determining the shear force based on wind direction perpendicular to the vessel axis. COMPRESS contains program constants for Cf for dished and flat head considered with wind applied in direction parallel to vessel axis, and for the saddles with wind applied in either longitudinal or perpendicular direction. The program constants are taken from the reference "Wind Loads and Anchor Bolt Design for Petrochemical Facilities" published by the American Society of Civil Engineers (ASCE). The specific values are shown below.

The designer should enter a value for Cf based on the values recommended in the building code. The value may vary based on the roughness of the shell (how many nozzles, etc) and should roughly account for the effects of the heads.

Summary of values for Cf:

Notes:

1. not considered; implicitly included in value Cf for shell
2. entered by user

* taken from the ASCE reference (NA not applicable)