Analyze Existing Equipment

The COMPRESS Rating Mode takes your design and determines the vessel’s MAWP, MAEP and MDMT. Rating Mode is often used when performing post construction calculations such as de-rating in-service pressure vessels and heat exchangers. Some new pressure vessel designers like to use it to input different pressure / temperature combinations and let COMPRESS tell them where the ASME Code errors are. COMPRESS also offers a true Design Mode where you input design data and COMPRESS selects component thicknesses and sizes. You can switch between Rating and Design Modes in COMPRESS at any time.

  • In Rating Mode COMPRESS calculates the maximum allowable working pressure (MAWP) and maximum allowable external pressure (MAEP) for the given temperature and pressure vessel geometry.

  • The minimum design metal temperature (MDMT) is determined per the rules of UCS-66 or UHA-51.

  • If the data entered does not meet ASME code requirements, COMPRESS will display the appropriate errors in the deficiencies dialog and identify the affected component(s). In other selected circumstances warnings and good engineering practice reminders are presented.

  • Some programs refer to this input mode as “analysis” because the software takes your input data and analyses but does not change it.

Adding an ASME B16.9 elbow to a vertical vessel in COMPRESS

Additional COMPRESS Highlights