Yes, that's it. The "H" support structure has a system for keeping the ground frozen so the structure remains standing. At the very top of each leg is a "finned" unit that dissipates heat from the ground surrounding the structure. A system of piping and antifreeze brings heat from the ground to the finned units. Obviously, it doesn't have to work too hard in the winter.
Without this system an overland piping system would not work. A majority of the pipeline is built in the land of permafrost.
This pic may have been taken near Glenallen or Gulkana or on the road to Valdez where the pipeline is very near the main highway.
The actual pipe, at this point, is probably either 24" or maybe 30" in diameter. There are then several layers of protective wrap and a last layer of insulating material. This is all protected by the outer metal sheathing. All fact sheets will tell you the pipe is 48" in diameter but this includes all the wraps, insulation and outer sheathing.