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→Tank batteries and metering
==Tank batteries and metering==
==Tank batteries and metering==
[[file:surface-production-equipment_fig6.png|thumb|{{figure number|6}}Orifice meter for gas measurement.]]
[[file:surface-production-equipment_fig6.png|thumb|300px|{{figure number|6}}Orifice meter for gas measurement.]]
Tanks must be provided to hold both oil and water for shipping or disposal. Usually, at least two oil tanks are used, one for shipping and one for filling. The volume of oil being shipped is sometimes determined by simply measuring the height of the fluid in the tank, or “strapping” the tank. Many of the more modern production facilities have lease automatic custody transfer (LACT) units installed. These stations continuously measure the flow into the shipping point and periodically sample the product being shipped so that oil gravity, temperature, pressure, and water content are known. The metering in this case is done with a positive displacement meter.
Tanks must be provided to hold both oil and water for shipping or disposal. Usually, at least two oil tanks are used, one for shipping and one for filling. The volume of oil being shipped is sometimes determined by simply measuring the height of the fluid in the tank, or “strapping” the tank. Many of the more modern production facilities have lease automatic custody transfer (LACT) units installed. These stations continuously measure the flow into the shipping point and periodically sample the product being shipped so that oil gravity, temperature, pressure, and water content are known. The metering in this case is done with a positive displacement meter.