Some standard content:
Pipeline Axonometric Drawing
HG 20519.13-92
Pipeline Axonometric Drawing
HG20519.13-92
This regulation provides the drawing method of pipeline axonometric drawing (i.e. empty view) for prefabrication and installation of above-ground pipelines. For lined pipelines, jacketed pipelines, and special-shaped pipelines, the drawing of pipe sections and pipe fittings shall be drawn in accordance with the drawing method of the national standard mechanical drawing (GB128-74).
1 Drawing Representation
1.0.1 Pipeline axonometric drawing shall be drawn in accordance with the isometric projection. The direction of the pipeline shall be in accordance with the direction mark (see Figure 1>, and the north (N) direction of this direction mark shall be consistent with the north direction of the direction mark on the pipeline layout drawing. 1.0.2 The text in the drawing shall be in Chinese, except for the specified abbreviations (see design regulations HG20519.27-92) which shall be in English.
1.0.3 The axonometric drawing of the pipeline shall be drawn on a printed paper, and a material table shall be attached to the side of the drawing. The materials of the selected standard parts shall comply with the provisions of the pipeline grade and material selection table. 1.0.4 For medium and low pressure carbon steel pipelines less than or equal to DN50, medium and low pressure stainless steel pipelines less than or equal to DN20, and high pressure pipelines less than or equal to DN6, axonometric drawings are generally not required. However, if the same pipeline has two diameters, such as the control valve group drain pipe, vent pipe, etc., there are exceptions, and the small pipe connected to the large pipe can be drawn. For the above-mentioned pipelines that are not allowed to be drawn with axonometric drawings, if the position of threaded or socket-welded pipe fittings or other pipe fittings is not clearly indicated in the pipeline layout drawing and needs to be indicated with axonometric drawings, then this part of the small pipe should also be drawn with axonometric drawings. In addition, for pipelines that are not allowed to be drawn in isometric drawings, such as straight pipe sections with enlarged orifice plates, the pipeline isometric drawings should be drawn. For pipelines that do not draw isometric drawings, a pipe section table should be compiled (see HG20519.15-92 for the format of the pipe section table). 1.0.5 The pipeline isometric drawing does not need to be drawn in proportion, but the proportions of various valves and pipe fittings should be coordinated: the relative proportions of their positions in the pipe section should also be coordinated. For example, the valve in Figure 2 should clearly indicate that it is close to the elbow and far away from the tee. 1.0.6 The width of the pipeline isometric drawing line can be found in the design regulations HG20519.28-92. The legend of pipelines, pipe fittings, valves and pipeline accessories can be found in this regulation HG20519.33-92. 1.0.7 The girth welds on the pipeline are represented by dots, and the flanges in the horizontal pipe section are represented by vertical short lines, see Figure 2. The flange in the vertical pipe section is generally represented by a short line parallel to the adjacent horizontal pipe section, see Figure 32. 1.0.8 Both the threaded connection and the socket welding connection are represented by a short line. On the horizontal pipe section, this short line is a vertical line. On the vertical pipe section, this short line is parallel to the adjacent horizontal pipe section, see Figure 3a. 1.0.9 The hand wheel of the valve is represented by a short line, which is parallel to the pipeline. The center line of the valve stem is drawn in the designed direction, see Figure 3b and Figure 19.
1.0.10 The pipeline is always represented by a single line. Draw the flow direction arrow at the appropriate position of the pipeline. The pipeline number and pipe diameter are noted above the pipeline. The elevation "EL" of the horizontal pipeline is noted below the pipeline, see Figure 4. When the pipe number and pipe diameter are not required and only the elevation is required, the elevation can be noted above or below the pipe, see Figure 10. 1.0.11 The axonometric drawing of carbon steel pipes shall not include alloy steel or carbon steel pipe sections to be impact tested, and vice versa. Short branches, pipe fittings and valves of the same material, even if their pipe numbers and main pipes are different, connected to the main pipe, should be drawn in the axonometric drawing of the main pipe, see Figure 5.
2 Dimensioning method
2.0.1 Except for the elevation in meters, all other dimensions are in millimeters (other units must be indicated). Only the number is noted, not the unit, and the decimal can be omitted. However, when several high-pressure pipes are directly connected, their total dimensions should be marked to one decimal place, see Figure 6. 2.0.2 Except for the provisions of 4.0.4 and 8.0.2.1, the length dimension of the vertical pipeline is not marked, but the elevation "EL" of the horizontal pipeline is used, see Figure 7.
2.0.3 The dimension line marking the relevant dimensions of the water pipe should be parallel to the pipeline. The dimension boundary is a vertical line, see Figure 8. The dimensions to be marked for the horizontal pipeline are: from the specified reference point to the equal-diameter branch pipe, the place where the pipeline changes direction, and the connection dividing line of the figure (see the dimensions of Article 3.0.2, such as dimensions A, B, and C in Figure 8. The reference point should be consistent with the pipeline layout drawing as much as possible to facilitate proofreading.
The dimensions to be marked are also: from the nearest main reference point to each independent pipeline component such as orifice flange, reducer, disassembly flange, instrument The dimensions of the surface interfaces and unequal diameter branches are shown in dimensions D, E, and F in Figure 8. These dimensions should not be marked as closed dimensions.
2.0.4 For the pipelines on the pipe gallery, the dimensions to be marked include: the dimensions from the boundary line of the main item, the connection dividing line of the graphic, the place where the pipeline changes direction, the pipe cap or other forms of pipe end points to the axis of the pipe gallery pillars at each end of the pipeline and to the axis of other pipe gallery pillars used to determine the position of the branch line or pipeline components, such as dimensions A, BC, D, E, and F in Figure 9. Other dimensions to be marked include: the dimensions from the axis of the nearest pipe gallery pillar to the branch or each independent pipeline component, such as dimensions G, H, and K in Figure 9. These dimensions should not be marked as closed dimensions. The axis of the pipe gallery pillars and their numbers that are not related to the marking of the above dimensions do not need to be shown in the figure. 2.0.5 Dimension annotation method for valves and pipeline components with flanges on pipelines: 2.0.5.1 Note the distance from the main reference point to the flange surface of the valve or pipeline component, as shown in Dimension A and Elevation B in Figure 10.
2.0.5.2 For regulating valves and certain special pipeline components such as separators and filters, the dimensions from flange surface to flange surface must be noted (not required for standard valves and pipe fittings), as shown in Dimension C in Figure 10. 2.0.5.3 When the position of valves or other independent pipeline components connected by flanges, butt welds, socket welds, or threads on the pipeline is determined by the size of the direct connection (FTF) between pipe fittings, do not indicate their positioning dimensions, such as the Y-shaped filter in Figure 10.
2.0.5.4 When standardized pipe fittings are directly connected to pipe fittings, their length dimensions generally do not need to be marked, but if the position of indoor pipes or branches is involved, it should also be noted, as shown in Figure 1 0. 2.0.6 For valves with threaded connections and socket welding connections, the positioning dimensions should be noted to the valve centerline on horizontal pipes, and the elevation "EL" of the valve centerline should be noted on vertical pipes, see Figure 11. 62
2.0.7 Method of noting the offset pipe (offset) dimensions: 2.0.7.1 Regardless of whether the offset pipe is vertical or horizontal, for non-45° offset pipes, two offset dimensions should be noted and the angle should be omitted; for 45° offset pipes, the angle and one offset dimension should be noted, see Figure 12. 2.0.7.2 For three-dimensional offset pipes, a hexahedron composed of three coordinate axes should be drawn to facilitate drawing recognition, see Figure 13. 2.0.8 When the offset pipe crosses the partition boundary, its axonometric drawing should be drawn to the partition line, but the continuation part should be drawn with a dotted line into the adjacent area until the first change in direction or the pipe mouth. In this way, the dimensions of the entire offset pipe can be noted, see Figure 14. This method is used when two axonometric drawings match each other.
2.0.9 To mark the size of the pipe, the center line of the container or equipment should be drawn (no need to draw the shape), and its position number should be noted, as shown in the upper right corner of Figure 15. If it is not related to the marked size, the center line of the equipment can be omitted. 2.0.10 To mark the size of the pipe connected to the pipe mouth of the container or equipment, the pipe mouth and its center line should be drawn for the horizontal pipe mouth, the pipe mouth symbol should be noted near the pipe mouth (according to the pipe mouth table on the pipe layout drawing), the position number of the equipment should be noted above the center line, and the elevation "EL" of the center line should be noted. For the vertical pipe mouth, the pipe mouth and its center line should be drawn, the equipment position number and pipe mouth symbol should be noted, and then the elevation "EL" of the flange surface or end face of the pipe mouth should be noted, as shown in Figure 15. 2.0.11 The walls, floors, roofs, and platforms through which the pipeline passes should be indicated. For walls, the dimensions in relation to the pipes shall be noted; for floors, roofs, and platforms, their respective elevations shall be noted, see Figure 16. 2.0.12 When pipes are not directly connected to pipes, reducers and forged short reducers shall be marked with the large end for position dimensions, see Figure 16.
3 Graphical connection boundary line, continued pipe and pipe grade boundary 3.0.1 When the pipe crosses the main item boundary, the boundary line is indicated by a thin dotted line, and "BL" is noted on its outside, see the left side of Figure 17. 3.0.2 When the pipe goes from one zone to another, a thin dotted line is drawn at the junction as the boundary line, and the drawing number of the pipe layout plan where the continued part is located (not the axonometric drawing number) shall be noted on the outside of the line. A small dashed line is drawn for the continued pipe, indicating the pipe number and pipe diameter and its axonometric drawing number, see the right side of Figure 17. 3.0.3 When a relatively complex pipeline is divided into two or more isometric drawings, the branch connection point, flange, and weld are often used as the dividing point. The outside part is drawn with a dotted line, and the pipeline number, pipe diameter, and isometric drawing number are noted. However, redundant and repeated data should not be noted to avoid errors during the modification process, as shown on the left side of Figure 12. 3.0.4 When a pipeline spans two layout drawings in the same area and their axonometric drawings are drawn together. The intersection of the layout drawings should be indicated on the axonometric drawing, and a thin dotted line should be drawn at the intersection. The drawing number of the layout drawing should be noted on both sides of the line. No positioning dimensions are given, see Figure 18.
3.0.5 The demarcation point of all pipeline grades in the flow chart and other supplementary requirements should be indicated, and the pipeline grades should be noted on both sides of the demarcation point. Other supplementary requirements refer to the grade of flanges or pipe fittings connected to equipment nozzles, regulating valves, and safety valves (because the flanges of these nozzles, regulating valves, and safety valves are of different grades from the pipelines connected to them) on a certain grade of pipeline, as shown in the upper left corner of Figure 18. For some special flanges (such as flanges connected to machines such as compressors) outside the design requirements, the pressure level and flange surface form of the flange are noted at the grade demarcation point, as shown in the lower right corner of Figure 18. 63
4 Orientation and deviation
4.0.1 The valve stem of all valves connected by flange, thread, socket welding and butt welding should clearly indicate the direction. If the valve stem is not in the N (north), S (south), E (east), W (west), UP (upper), DN (lower) orientation, the angle should be noted, see Figure 19.4.0.2 The orientation of the bolt holes of the equipment pipe flange should be clearly indicated on the axonometric drawing when there are special requirements (such as not in the middle of the span), see Figure 20. And check the equipment conditions. 4.0.3 For eccentric reducers on pipelines, the centerline elevation "EL" of the pipes at both ends of the reducer is generally noted, and it is not necessary to note "FOB" or "FOT" and other instructions, see Figure 21.4.0.4 For orifice plates, plug plates, and 8-shaped blind plates installed on vertical or horizontal pipelines, their thickness dimensions including gaskets must be noted, see Figure 22.
4.0.5 For flange joints with only one gasket, the thickness of the gasket (regardless of the type) does not need to be indicated. The size is marked according to Figure 23.
5 Special markings for assembly
5.0.1 The following pipe fittings must be marked in the axonometric drawing with the specified abbreviations: short radius seamless elbow, pipe cap (welded pipe cap, threaded pipe cap, socket welded pipe cap), threaded flange, threaded short pipe, pipe joint, plug, union. See Figure 24. If there are several different types of flanges for the same pipe diameter in an axonometric drawing, the type of flange should be indicated near the flange to avoid installation errors.
Indicate the angle and number of welds of the mitered elbow (shrimp waist elbow), see Figure 25. 5.0.2
5.0.3 Mark the number of special parts in the 5mm×5mm square, see Figure 26. The materials are listed in the special parts column of the material table. 5.0.4 Indicate the type and number of the control points consistent with the pipeline layout drawing, see Figure 27. 5.0.5 In an axonometric drawing, if there are two or more valves of the same type and specification, and the selected models are different, the model should be indicated near the valve (the one with the largest number can be omitted) to avoid installation errors, see Figure 27. 5.0.6 Indicate the number of the pipe rack directly welded to the pipeline, which should be consistent with the number in the pipe rack table, see the lower left corner of Figure 27. The pipe rack material is not included in the material table of the axonometric drawing. 5.0.7 The elbow should be drawn with an arc and the bending radius should be indicated. For example, the elbow with a bending radius of 5 times the nominal diameter of the pipe is marked R-5D. Seamless or stamped elbows (R≤1.5D) can be drawn in an angle and the weld can be indicated, see Figure 28. 5.0.8 Combined accessories (such as hose joints) and socket welds, pipe seats, threaded pipe seats, reducers, etc. should be marked and numbered as special parts, see Figures 29 and 30.
5.0.9 The ends of short pipes of different forms should be indicated by abbreviations, and the elevation of the end face should be noted when necessary. See the lower left corner of Figure 30. 64
6 Flow-limiting orifice
6.0.1 The flow-limiting orifice installed between the pipe flanges is indicated in Figure 39. 6.0.2 The flow-limiting orifice installed in the pipeline is indicated in Figure 40. This type of flow-limiting orifice is generally grouped (that is, the number of orifices is two or more), and is numbered as a "special part". In the name and specification column of the material table, fill in "flow-limiting orifice group", leave the material column blank, fill in "1 set" in the quantity column, and fill in the assembly drawing number of the orifice group in the standard number or drawing number column. 7 Flowmeter Orifice Flange
7.0.1 The dual pressure pipe orientation of the orifice can be indicated by the method from E to H in Figure 31. 7.0.2 When the straight pipe section required by the orifice extends into another pipe layout drawing or another area in the same area, the total length of the straight pipe section must be maintained between the two. The representation and dimensioning method are shown in Figure 32a. 7.0.3 The dimensioning method of the straight pipe section with orifice expansion is shown in Figure 32b. 8 Division of axonometric drawings
8.0.1 When the pipeline is divided into two axonometric drawings from the reducer, the reducer should be drawn in the axonometric drawing of the large pipe, and the reducer should be represented by a dotted line in the axonometric drawing of the small pipe, as shown in Figure 33.8.0.2 When the inlet and outlet pipelines of the safety valve are divided into two axonometric drawings:8.0.2.1 In the axonometric drawing of the inlet pipeline, the safety valve is represented by a solid line, and the vertical dimension from the inlet flange surface to the outlet center line is marked. The outlet center line is used as the pipeline grade dividing line and the pipeline grade is noted on both sides. Draw a dotted line for the outlet pipeline and mark the pipeline number, pipe diameter, elevation and the axonometric drawing number where it is located, as shown in Figure 34.8.0.2.2 In the axonometric drawing of the outlet pipeline, the safety valve is represented by a dotted line, and the horizontal dimension from the inlet center line to the outlet flange surface is noted. For the outlet pipe, the pipe number, pipe diameter, grade and elevation are indicated, see Figure 35. 8.0.3 When a pipe section with a high gas storage point is divided into two or more isometric drawings by the regional boundary line, the designer or verifier shall consider the entire pipe to ensure that a vent is provided for the pressure test. 8.0.4 When a pipe section with a low liquid storage point is divided into two or more sampling drawings by the regional boundary line, the designer or verifier shall consider the entire pipe to ensure that a drainage port is provided at the low point. The drainage drawing should be set at a location that does not (or less) affect the maintenance pipeline or a location far away from the sewer entrance (to avoid materials entering the sewer). Based on these requirements, the most appropriate location is selected between adjacent areas.
8.0.5 Simple, short branch pipes can be drawn in the isometric drawing of the main pipe. For the requirements for the division of isometric drawings for the materials of the main pipe and branch pipes, see Article 1.0.11. For alloy steel pipelines or factory-fabricated carbon steel pipelines, short branches can be drawn in the axonometric drawing of the main pipe. For carbon steel pipelines manufactured on site, the section connected to the main pipe can be drawn in the axonometric drawing of the main pipe or the pipe connected to the section (whichever is more convenient). For long branches that change direction multiple times, a separate axonometric drawing should be drawn. 8.0.6 As the engineering design progresses, the public system pipelines (such as steam, water, air, etc.) on the pipe gallery may have additional branches (such as steam tracing steam extraction, steam trap return water, etc.). For their axonometric drawings, room for adding branches should be considered. 8.0.7 When the pipe in the axonometric drawing of A is directly connected to the valve in the axonometric drawing of B, the valve should be represented by a dotted line in the axonometric drawing of A, and the handwheel and valve stem of the valve may not be represented, see Figure 36. However, if the valve stem of the flange-connected valve has the requirements of 4.0.1 and 4.0.2, the position of the valve stem must be indicated in both the A and B isometric drawings (see Figures 19 and 20 for the representation). 9 Factory or on-site manufacturing
9.0.1 The boundary between factory manufacturing and on-site manufacturing shall be indicated only when the project manager requires it. 9.0.2 If there are accessories processed on-site on the factory-made pipeline and it will be connected to the pipeline at a certain angle, the dimensions noted should enable the constructor to determine the position, see the dotted pipeline in the upper right corner of Figure 36. 9.0.3 For welds that require on-site welding, "FW\" shall be marked near the weld, see Figure 36. 10 Insulation (including sound insulation) boundary
10.0.1 The insulation boundary shall be marked at the boundary of different types of insulation of the pipeline and at the boundary between insulation and non-insulation, and the insulation type or whether it is insulated shall be noted on both sides of the boundary. If the boundary coincides with some easily identifiable parts (such as flanges or pipe ends), only the insulation boundary may be indicated without indicating the positioning size, see Figure 37. 10.0.2 When an uninsulated pipeline for conveying gas is connected to an insulated pipeline, the valve or equipment (pipeline accessories) closest to the insulated pipeline shall be used as the boundary, see Figure 37.
10.0.3 When an uninsulated pipeline for conveying liquid is connected to an insulated pipeline, the distance The hot pipe is divided at 1000mm or the first valve, whichever is closer, see Figure 38. 10.0.4 The dividing point for insulation for personal protection is not indicated in the axonometric drawing. The form and requirements of this type of insulation are determined on site by the design and production units. 11 Requirements for filling in the material table on the axonometric drawing
11.0.1 The gasket should be filled in with the corresponding code according to the nominal pressure PN and nominal diameter DN of the flange, see HG20519.39-92, and the sealing code is shown in HG20519.40-92. There is no need to fill in the specific specifications and dimensions of the gasket. 11.0.2 For studs of special length, fill in their length in the special length column. When filling in the number of studs and nuts, it should be preferred to count according to the number of flange connection sets. 11.0.3 For non-standard bolts, nuts and washers, fill in the special parts column. 66
11.0.4 In the insulation column, fill in the code according to the design specification HG20519.30-92. 11.0.5 There are two formats for the material table on the axonometric drawing (1) For manual material statistics, fill in the specific number of studs in the stud column, see example table 2. (2) For computer material statistics, fill in the number of flange connection sets in the stud nut column, see example table 1. See Figures 1 to 40
Example Tables 1 and 2
Circular diameter 15mm
Equal diameter branch pipe
Independent pipeline components
Unequal diameter branch pipe
Disassembly flange
The dotted line part may not be drawn
Pipe connection
Independent pipeline components
Circular true diameter 10mm
In-service injection pipe
Column axis number
Elevation B
Steam-water separator
Shaped filter
ELxxx.xx×
4S \HOR
45*HOR
ELXXXX
That is, if the pipes are directly connected to each other, they should also be marked if they are over a certain distance.
The measurement should be ELxxxx
Lxxx:xxx
The floor version EL××
Must be marked
Although there may be such a pipe
, it does not need to be marked
25
BW2011-80
Empty view drawing number
1221/2
ELxxx:
22 1/2Www.bzxZ.net
City bolt hole orientation
Surrounding 24
Figure Diameter 10mm
RF1043
Figure 28
Axonometric drawing of the pipe section where the orifice plate is located
(All divided) orifice plate
BW3021-
(All divided) flower
PEELX X X. X × X
Axonometric drawing of the extended straight pipe section of the orifice plate
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