The small gas line starts at 10" in Prudhoe at PS1, necks down to 8" after 34mi and terminates at PS4 149mi south of Prudhoe. I corrected the pressure; it operates at 1090psi and has a design max of 1335psi. And the turbines driving the pumps use 4.3mcf/day, not 2.8. The oil pipeline is 48" in diameter and operates at up to the design max of 1180psi. The oil is injected in Prudhoe at 116degF and is 66degF when it reaches Valdez after 8.6days en route at 3.9mph. Pipeline friction, which is controlled by injecting a polymer drag reducing agent, keeps it warm; not sure if they warm it prior to injection into the line. When full, the line holds 9,059,057 bbls of oil. The maximum avg daily throughput for the line was in 1988 when just over 2mill bbl/day were transported. Today it's down around 600,000 bbl/day, though some recent major discoveries on the slope will be ramping that back up significantly and will, despite the dire predictions for at least 25yrs of the impending death of the pipeline due to a lack of supply, keep it going for a very long time.
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