How to see the direction of shadow part of chemical pipeline? Please draw a picture and explain it in detail. Thank you.

First, from a big perspective, it is clear that the single-line diagram mainly includes "three parts".

1. graphically represents the assembly composed of pipe segments and their positions in three-dimensional space.

2. Engineering data, including pipeline design parameters, various sizes, elevations, pipeline marks, pipeline numbers, main requirements for installation and inspection, etc. The bill of materials lists the types, specifications, quantities and standard specifications used.

3. Legend, compass, title box and other related contents.

II. Audit details: The contents in the general single-line diagram shall include the following basic contents.

1. Title bar: mainly describes the name of pipeline installation project, single line drawing number, pipeline number, drawing, signature of inspector and installation date;

2. North arrow: the direction indication of the basic direction of the pipeline; The main parameters of pipeline mainly include design pressure, design temperature, medium name, pipeline category, design specification and pipeline installation acceptance specification;

3. Legend: Description of main components and attached symbols of pipelines under different laying modes;

4. Basic information table of pipelines: mainly including pipelines that are subjected to 100% radiographic inspection according to the requirements of GB 50235-971.0.3.4. The basic contents should be pointed out in the single line diagram and Annex III of the Management Rules for Pressure Piping (Trial). You need to provide some main information.

5. Single-line diagram of pipeline: A single-line diagram of pipeline drawn by axonometric drawing method, which accurately shows the specifications, length, elevation, number of welds and approximate position of each part of the pipeline. For the specification and grade of pipeline materials and the corresponding material standards, and in the case that the pipeline involves a large number of components, we can also consider adding a bill of materials to express the basic information of pipeline components.

Third, read according to relevant instructions and pipeline marking methods. Reading pictures is not a day's work, and then use Baidu search.

1, the shaded part indicates that the pipeline does not extend in the normal southeast-northwest direction, but rotates at a certain angle (generally 45), and the direction of the pipeline can be determined according to the size of the shaded mark.

2. Drawing the pipeline single-line diagram on site means showing the direction of the pipeline with drawings on the side view, marking the inspection position, and checking the contents and methods. Line diagram is the most basic diagram in pipeline construction, and only one line is used to represent all kinds of information of pipeline, so it is called single-line diagram.

Extended data:

You can see the shadows on the facade, the lines on the corners of the plane, and the lines marked with codes on the engineering drawing. If you look for code, you can see the enlarged description and the size of the line.

For example, if M5 is marked on the graph, you can see the position of M5 on all graphs.

Must understand the basic knowledge of pipeline, such as mechanical drawing, coordinates, pipeline fittings, etc. Usually, the pipeline single-line drawing must know the specification, length, elevation, how to connect the pipeline fittings and so on. First look at the comprehensive knowledge to understand the working principle of the pipeline, and then look at the details.

Baidu encyclopedia-chemical pipeline