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Steel pipe scheduling is a system that classifies pipes based on their wall thickness relative to their diameter. The schedule number indicates the pipe's wall thickness, and thus, it directly impacts the pipe's ability to handle pressure and the overall strength of the structure in which it is used. For example, a higher schedule number corresponds to a thicker wall, which is capable of withstanding greater pressure. This measure is essential in many applications, particularly in industries such as oil and gas, where the integrity of piping systems is crucial for safety and efficiency.

The other options pertain to different attributes of pipes. Pipe length is a separate specification that describes how long the pipe is; pipe material type refers to the substance from which the pipe is made, such as steel, PVC, or copper; and pipe connection type indicates how the pipes are joined together, such as welded, threaded, or flanged connections. None of these directly relate to the concept of scheduling in the context of steel pipes.