EL is the elevation datum, which indicates the elevation of the pipe bottom when the rectangular duct is not specified; When the circular duct is marked with a description, it indicates the elevation in the duct.
In the plan layout of engineering pipelines, the plan layout and installation elevation dimensions of pipelines, codes, quantities and dimensions of equipment and accessories must be marked, and necessary written descriptions must be written.
Dimensions are often marked with building positioning axis, equipment center line, pipeline extension line, etc. The starting point of dimension line can be a short diagonal of 45, instead of an arrow, and the size is often marked as a continuous series. Usually, the dimensions in plan view are in millimeters, while the dimensions in elevation view are in meters.
Extended data:
Reading the pipeline layout, whether it is to review the design, installation, construction, or reference, maintenance, transformation, mainly through the drawings to understand the design intent of engineering pipelines, to understand the specific layout and installation of pipelines, fittings, valves, instruments and equipment.
Therefore, reading the pipeline layout should be carried out according to the following method steps:
(1) Overview:
Firstly, the view configuration, quantity and expression content of each view of engineering pipeline are summarized. And initially understand the meaning of legend and code, as well as the drawings of non-standard pipe fittings and pipe racks. Then browse the equipment project number, nozzle list, construction requirements and plans of different elevations, etc.
(2) Layout analysis:
First of all, according to the process sequence and pipeline number, find out the equipment number and nozzle of the starting and ending points of the pipeline one by one. And according to the projection relationship, expression, graphic symbols and relevant regulations of the floor plan, find out the inlet and outlet, branch and installation position of each pipeline, as well as the types and arrangement of valves, fittings, instruments and pipe racks;
(3) size analysis:
By analyzing the dimensions in the pipeline layout, we can understand the positioning of pipelines, equipment, nozzles and fittings. , and the mutual distance relationship between them. By analyzing other marks, we can know the process materials, pipe diameters, valve models, pipe fittings specifications, installation requirements, etc.
Baidu Encyclopedia-Pipeline Diagram