Troy, Depending on the accuracy you're looking for, the CHARC block may provide all function you need. You simply enter values from the strapping table as the X-Y coordinates. There is one caveat: you want to select values from the table that will provide most linear segments between them. For instance, a sump or manway makes for a different volume/inch than a straight side. If you need more resolution than you get with 20 segments, you might devise a clever way to combine more CHARC blocks. For my purposes, one block has done just fine. Jerry Hidahl _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave