Pipeline Computer Shut Down

The computer and backup system that control the operation of the pipeline and Marine Terminal shut down for approximately 36 minutes on May 25. The pipeline continued to operate under local control from the pump stations.

An auxiliary computer control station malfunctioned, sending a continuous stream of data to the pipeline computer. The pipeline computer correctly interpreted this malfunction as a failure and shut down.

The pipeline was operating under normal steady-state conditions when the computer shutdown occurred. The decision was made to continue pipeline operation by shifting control to the seven pump stations that span the length of the pipeline. While the pipeline was operated under local control, approximately 21 Remote Gate Valves (RGVs) were not monitored by the pump stations. The valves not actively monitored were those south of three ramped-down pump stations (Pump Stations 6, 8, and 10).

High Inventory Anticipated

Alyeska Pipeline and the North Slope producers reduced throughput in the pipeline to 77 percent of normal production Monday, June 7 at 3:00 p.m. due to anticipated high inventory levels in Valdez. With the reduction in throughput, the terminal inventory will reach approximately 97 percent of working capacity by June 11, when the next tanker will call at the Marine Terminal.

Two of the Terminal’s 510,000 barrel crude storage tanks are out of service for scheduled maintenance which affects available inventory space.

Vessel Christening

The new tractor tug, Tan’erliq, will be christened in Tatitlek, June 11. Media interested in attending should contact Sandy McClintock at 907-834-7084. Video of the event will be available for pick-up on Saturday, June 12, by noon at the Anchorage Headquarters Office on Bragaw.

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