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Using a dipstick to measure the amount of fuel remaining in a tank The lower end of an oil dipstick with markings for minimum and maximum oil levels. Dipsticks can also be used to measure the quantity of liquid in an otherwise inaccessible space, by inserting and removing the stick and then checking the extent of it covered by the liquid.
Custody transfer measurements involve measurements in pipelines, storage tanks, transportation tanks (tankers, trailers or railway tanks) - whole fuel distribution process must be traceable. In order measurements can be made in a volume or mass units (or both), so various metering methods are commonly used. [3]
The oil accumulating at the top is then transferred to waste oil tank on the vessel where it is later discharged to a treatment facility ashore. This type of Oily Water Separator is common in ships, but it has flaws that decrease efficiency. Oil particles that are twenty micrometers or smaller are not separated.
Pressure in blanketed tanks is maintained by self actuating pressure control valves (PCVs). As liquid is withdrawn from the tank the pressure in the gas space falls. The blanket gas supply valve opens to maintain the pressure. As the tank fills with liquid the pressure rises and a vent gas valve open to vent gas to atmosphere or a vent system. [11]
Although some oil was produced commercially before 1859 as a byproduct from salt brine wells, the American oil industry started on a major scale with the discovery of oil at the Drake Well in western Pennsylvania in 1859. US crude oil production initially peaked in 1970 at 9.64 million barrels (1,533,000 m 3) per day.
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