Four-Day Planet by H. Beam Piper

Now that we were out of the traffic jam, I could poke along and use the camera myself. The wax was stacked in piles twenty feet high, which gave thirty feet of clear space above them, but the section where they had been piled was badly cut up by walls and full of small extra columns to support the weight of the pulp plant above and the carniculture vats on the level over that. However, the piles themselves weren't separated by any walls, and the fire could spread to the whole stock of wax. There were more men and vehicles on the job than room for them to work. I passed over the heads of the crowd around the edges and got onto a comparatively unobstructed side where I could watch and get views of the fire fighters pulling down the big skins of wax and loading them onto contragravity skids to be hauled away. It still wasn't too hot to work unshielded, and they weren't anywhere near the burning stacks, but the fire seemed to be spreading rapidly.

The dredger and the three shielded derricks hadn't gotten into action yet.