Victaulic coupling
A patented pipe coupling made in two halves that wrap around the grooved ends of two lengths of pipe and are forced together by bolts. Before the halves of the coupling are put in position, a rubber ring is placed over the junction of the two lengths of pipe. When the coupling is tightened with the two bolts. The rubber is compressed, making a pressure tight connection
Vis-Breaking
A light thermal cracking process carried out on a fuel oil during the refining process to reduce product viscosity without blending.
Viscosimeter
A device for determining the viscosity of oil. There are several methods or devices in general use. Basically, a fixed quantity of oil is allowed to pass through a fixed orifice at a specified temperature over a measured time span and then compared to a standard liquid such as a calibration oil or water.
Viscosity
Measure of the internal friction or resistance of an oil to flow. As the temperature of an oil is increased, its viscosity decreases and it is therefore able to flow more readily. Viscosity is measured on several different scales, including Redwood No. 1 at 100F, Engler Degrees, Saybolt Seconds, etc. The most common method for designation of viscosity is kinematic viscosity, measured in centistokes, cst @ 50Centigrade.
Volatile
A volatile substance is one that is capable of being evaporated or changed to a vapor at a relatively low temperature. Volatile substances also can be partially removed by air stripping.
