Any vessel may be modeled using the following input sequence. In this sequence, general options are set before entering the vessel details. Some users prefer to input typical vessels using the Vessel Wizard. Please see the COMPRESS manual for Vessel Wizard usage guidelines. The suggested detailed vessel design sequence is:

1. Begin a new design by selecting File > New Division 1 (or Division 2) Vessel from the File Menu or by clicking on the "New Div 1" toolbar icon.
2. COMPRESS will automatically use the latest ASME Code Addenda when creating a new file. Older Addenda may be specified by selecting Codes > ASME from the Codes Menu.
3. If wind or seismic loads are present, add the applicable wind and seismic loads by selecting Codes > Wind and Codes > Seismic from the Codes Menu.
4. Specify the datum line location and vessel orientation by selecting Action > Datum from the Action Menu.
5. If operating liquid is present, set the desired liquid level(s) by selecting Loads > Liquid Level from the Loads Menu.
6. Set design options such as units, hydrotest and nozzle design basis by selecting Action > Set Mode Options from the Action Menu (F7).
7. Design the vessel. It is recommended that the design file (.CW6) be saved often using the File > Save As option.
   • Begin with the top head (left head for horizontal vessels) and work down (or left to right). Note that you can insert components into the model at any time by pressing the insert key.
   • Add the pressure boundary components (cylinders and formed heads) before adding nozzles. If external pressure is specified and vacuum rings are required, ring spacing should be finalized before adding nozzles.
   • If external forces or loads are present, add them by selecting Loads > Lateral Force and Loads > Vertical Load from the Loads Menu. Note that vertical loads are treated as a mass and affect the period of vibration.
   • Add the major attachments such as platforms/ladders, trays and packed beds. These items are found in the Attach Menu.
   • Add the supports (skirt, lugs, saddle, legs etc.). These items are found in the Support Menu.
   • Add nozzles to the vessel. The Nozzle Menu Quick Design option selects wall thicknesses and adds pads automatically.
   • Add any remaining attachments. These items generally will not affect the nominal thickness of shell components and may be left until the design is almost completed.
8. Code reports can be generated at any time by pressing F3.