New Version 2.3.1 (Released May. 2009)

• Added capabilities for making PDF files of the performance output data sheets
• Expanded the Compressors/Manufacturer models list to include a few single cylinder models
• Upgraded the MAWP rating of the 6.5” & 7.0” double acting cylinders to 400 psi
• Program is now compatible with newer Vista 64 bit processors

New Version 2.2 (Released Nov. 2008)

The program now has the capability of adding clearance to the crank-end of any steeple cylinder using valve spacers at 8%, 16% and 24% increments. This will provide better control of the discharge temperature on the second stage of three stage units.

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There are now over 100 possible cylinder configurations listed in the “Manufacturers” list of “Compressors”, making the program more user friendly as customers will rarely need to develop “Program User” configurations and eliminate the risk of creating a configuration that has not been checked by Arrow Engineering to make sure it can be properly balanced.

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Improvements have been made to the “File”/ “Save Job As” function, however, due to changes in format, jobs saved in version 2.1 will not be compatible with version 2.2.

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Other improvements have been made to “ Gas Analysis”, and the “Clearances Fixed”, “Power Fixed”, & “Capacity Fixed” functions available in the drop-down menu to the right of the “CALC Power & Clearances” button. Note that these functions are used only to fine-tune an application for the cylinder configuration selected. Pop-up instructions help explain this.