What do these elevation legend symbols for the various areas mean?
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There are several triangles indicating the elevation of underground pipes. I know the symbols for the bottom and top of the pipes, but there are a few others I don’t recognize – such as those with a vertical line inside the triangle, empty triangles, and solid triangles. Please provide an explanation.
Waiting for the expert to explain! It’s a bit like the drawings from Zhanjiang Sinopec Refining
Look at the legend. The filled area at the bottom of the triangle represents the bottom elevation inside the pipe, while the filled area at the top represents the top elevation inside the pipe. The fully filled area indicates the depth of the shaft. The elevation marked with a vertical line in the middle represents the center elevation of the pipe, and the area with no markings denotes the general elevation (the elevation of the bottom of the water seal pipe)