Here is a small and very simple yet quite useful piece of software developed by the Dolphin Maritime Software Ltd years ago; this program is intended to be used for calculation of the oil products. In the Utility section there are Pipe capacity, Interpolators 1 and 2 Ullage/Trim, Wedge, Vessel Experience Factor, etc. It contains necessary ASTM tables inside. It will help the ser to conduct proper conversion between API, SG and Density, Vac to Air wieght, convert temperatures, find standard API/SG/Density and VCF against them. No need for installation, just launch the file and calculate. No viruses.