The columns were part of the expansion of Aramco's NGL facilities in Abqaiq and Ras Tanura.
From the May 21, 1975 edition of The Arabian Sun.
That's 920 tons of cargo the M/S Lady Sophie is getting ready to offload at the Ras Tanura West Pier.
The column nearest the ramp weighs 500 tons, is 26 feet in diameter, and 110 feet long. The smaller column weighs 420 tons, is 20 feet in diameter, and 140 feet long.
These columns and the one aboard the M/S Bellatrix, which recently arrived at the West Pier, are all part of the expansion of Aramco's NGL facilities in Abqaiq and Ras Tanura.
— The Arabian Sun: May 21, 2023