You can build your own load limit file.
Open that file that you found in the SYSTEM folder (API-610.eql). You can edit it and save as a new name.
In addition to supplying your own load limits, there is a force & moment converter that allows you to input magnitudes based on your common units.
Vessel.eql is not as complicated as API-610.eql. Check that one out too.
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Dave Diehl