Pipeline single-line drawing is an empty view (three-dimensional drawing) of the pipeline represented by a single line according to the drawing method of equilateral or oblique projection, and there are signs indicating the direction, joint number and material of the pipeline on the drawing. The trend and size of the single-line diagram are drawn according to the data provided by the plan and section.

Mark the direction of the pipeline in the upper left corner of the drawing, with the X-axis indicating the north-south direction, the Y-axis indicating the east-west direction and the Z-axis indicating the up-and-down direction, which may not be drawn to scale, but the dimensions of each part and each valve fitting should be appropriate and not too different. Pipelines are all represented by single lines, and pipe fittings, valves, flanges, supports and various instruments are drawn by unified legend symbols.

Extended data:

Precautions:

1. Judging according to the drawings: Whether the launching direction is correct can be judged visually according to the drawings. ?

2. Pass the water cooling test and thermal acceptance test: check whether the cold water pipe and hot water pipe are connected correctly. Generally, the hot water pipe is red, and there is a red sign in the middle of the hot water faucet switch, which can accept water cooling test and hot water test. ?

3. Tape inspection: check the laying of water pipes and the positions of power supply and gas pipelines. General distance of ≥50mm or more, can use tape measure to check. ?

4. Experience visual inspection and acceptance: it is not advisable to tighten and straighten the aluminum-plastic composite pipe when it is concealed in the wall, and a little room can be left to avoid the expansion and deformation of the pipe when hot water passes through, and the joint cracks and leaks, which can be judged as slight bending by visual inspection.

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