In the pipeline layout, what line is used to represent the pipeline?

In the piping layout, valves are represented by simplified projections. Basic requirements for drawing valves: 1. The drawings are consistent with the flow chart; 2. Draw it in proportion with a thin solid line to indicate the characteristic size of the valve body; 3. Draw the position and size of the handwheel. The valve shall be marked with the position of handwheel, the position and size of compensator, main valve and drain valve, flowmeter and liquid seal. Drawings of globe valves: According to the graphic legend, the characteristic dimensions need to be displayed. The specifications and dimensions of the valve are listed in the product sample, and the drawings are made according to the sample during design. Drawing of spring safety valve; Pipeline projection drawing requires mastering: 1. Drawings of pipeline connection, turning, branch point (tee), crossing, lap joint, reducing pipe and insulation pipe. 2. Paint the valve. Control point diagram: draw control points in the pipeline installation diagram; And size: unit: elevation is generally meters, accurate to three decimal places, and other units are millimeters. 1. Building a) Determine the number and spacing of shafts on the floor plan. B) Mark the elevation of the ground, floor, platform surface, crane and beam top surface. 2. Equipment c) Others: pipeline slogan, nozzle elevation, etc. 3. A) mark the pipeline number (the same as the flow chart number) b) mark the positioning size and elevation. Based on the building axis or equipment centerline, mark the central positioning dimensions of pipelines, valves, orifice meters, traps, compensators, liquid seals, etc. Or position them so that the flange faces are at one end. ① Elevation of horizontal pipeline: the elevation of horizontal non-pipeline center shall be marked before the elevation; Elevation of pipe bottom: BOPEL 104. 100, elevation of pipe top: EL 104. 100② Riser: elevation of valves and pipe fittings flanges; (3) Inclined pipes shall be marked with slope and working point elevation. Two benchmarks of elevation: relative elevation and altitude. Where numbering is required; Pipes pass from one plane to another; The diameter or position of the pipeline changes; The pipeline has a branch pipeline. C) Flow direction of medium: Generally, arrows are drawn on the center line of the pipeline, and the number of arrows should not be too much or too little. There should be an arrow between the two circles. D) Slope: The pipeline with slope shall be marked with slope and slope direction. For pipelines that are not allowed to accumulate condensed water or can discharge the medium in the pipeline, water pressure test should be carried out and the machine should be stopped. , should set the slope, the general slope is 0.003~0.0 1. Valves and fittings may not be indicated in the drawings, but their specifications, models or standard numbers, quantities and materials are indicated. It shall be listed in the piping material list. 4, pipe fittings (elbow, tee, reducer, flange), etc. Reducing pipes, such as DN80/50 or 80×50, shall be marked on the drawings. 5. Valves: Valves shall be marked with positioning dimensions; The valve number and model can be marked. 6. List of exhaust and drainage lines on the pipeline: Look at the picture in combination with the cross section and flow chart; Analysis on improving the design level of pipeline layout. List of pipeline materials: 1. Main uses: (1) used for installation and construction, which is one of the bases for distributing materials and installation on site; (2) Comprehensive material list statistics. 2. Contents: According to each pipe number, list specifications, models or drawing numbers or standard numbers, quantities, etc. Pipes, fittings, valves, flanges, bolts, nuts, washers and other materials on each pipe. (1) The pipe number, destination, design temperature and pressure of each pipeline shall be indicated; (2) List the installation materials of all pipelines (excluding flowmeters, regulating valves and other automatic primary components). Examples of piping installation materials: