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Pipeline symbols

Based on GOST 21.206-2012. This page is not the original document. Translation may be inaccurate.

3 General Provisions

3.1 The designation of a pipeline should consist of a graphic symbol or a simplified representation of the pipeline and an alphanumeric or numerical designation characterizing the type of engineering system (network) or transported environment, the purpose of the pipeline and its parameters.

3.2 Graphical symbols and simplified designations of pipelines and their elements are given in Table 1.

Table 1

DescriptionSimplified imageGraphic designation
1 Pipeline
Pipeline - a simplified imagePipeline - graphic representation
2 Pipeline with a vertical riser pointing downward, or a branch directed from the readerPipeline with a vertical riser pointing downwardPipeline with a vertical riser
3 Pipeline with a vertical riser pointing upward, or a branch pointing towards the readerPipeline with a vertical riser pointing upward
4 Flexible tubingFlexible tubingFlexible tubing
5 Crossing pipelines without connectingCrossing pipelinesCrossing pipelines
6 Connection of pipeline components
  a) generalConnection of pipeline componentsConnection of pipeline components
  b) flangeFlange connection of pipeline componentsFlange connection of pipeline elements
  c) coupling screwCoupling screw connection of pipelinesCoupling screw connection of pipelines
  d) threaded nippleThreaded nipple connection of pipelinesThreaded nipple connection of pipelines
  e) threaded quick-fitThreaded quick-fit connection of pipelinesThreaded quick-fit connection of pipelines
  f) flareFlare connection of pipelinesFlare connection of pipelines
7 End of the pipeline with a plug (stopper):
  a) generalEnd of the pipeline with a plug (stopper)End of the pipeline with a plug (stopper)
  b) flangeEnd of the pipeline with a plug - flangeEnd of the pipeline with a plug - flange
  c) coupling screwEnd of the pipeline with a plug - coupling screwEnd of the pipeline with a plug - coupling screw
  d) threaded nippleEnd of the pipeline with a plug - threaded nippleEnd of the pipeline with a plug - threaded nipple
  e) flareEnd of the pipeline with a plug - flareEnd of the pipeline with a plug - flare
8 Piping connecting parts:
  a) crossing*Piping - crossingPiping - crossing
  b) tee*Piping - teePiping - tee
  c) tap*Piping - tapPiping - tap
  d) transitionPiping - transitionPiping - transition
* Depicted in accordance with their actual configuration

3.3 In the alphanumeric designation, the letter or first digit indicates the type of engineering system (network) or transported environment, the subsequent figures indicate the purpose and / or parameters of the transported environment.

3.4 On the diagrams, the pipelines are represented by conventional graphic symbols (one line).

3.5 In the drawings, pipelines and their elements are depicted by conventional symbols and / or simplified images.
The pipelines in the drawings are simplified in two lines, if their diameters are 2 mm or more on an appropriate scale.
It is allowed to represent the pipeline with two lines without applying an axial line or apply an axial line on a short section of the pipeline.

3.6 In electronic (3D) models, pipelines of any diameter are represented by two lines.

3.7 Visible parts of the projected pipelines are represented by a solid thick main line in accordance with GOST 2.303, invisible (for example, in overlapped channels) - a dashed line of the same thickness. It is allowed to use other types of lines in accordance with the requirements of the relevant standards of the design documentation system for construction.
Visible and invisible sections of existing pipelines are represented by a continuous thin line or a dashed thin line, respectively.

3.8 When displaying a pipeline in a drawing (diagram) in one line, alphanumeric or numeric designations are indicated in one of the following ways:

Picture of the pipeline in the drawing
Figure 1

3.9 With simplified graphical representations of the pipeline (in two lines), alphanumeric or numeric designations indicate on the shelves of the leader lines [Fig. 2a)] or directly above the graphic image of the pipeline [Fig. 2b)].

Simplified graphical representation of the pipeline
Figure 2

3.10 The number of alphanumeric or numeric signs to be placed on the pipelines should be minimal, but providing an understanding of the drawing.

3.11 Dimensions of pipelines diameters, with their graphic symbols and simplified graphic images, indicate in mm without a unit of measure and are applied on the shelves of the leader lines or directly above the graphic image of the pipeline in the following form:

Dimensions of pipe diameters with their conventional symbols
Figure 3