HG 20559.3-1993 Pipeline and instrumentation flow chart Pipe and pipe fittings graphic symbols HG20559.3-1993 standard download decompression password: www.bzxz.net

Pipeline instrument flow chart pipeline and pipe fittings
Graphic symbols
HG20559.3-93
Compiled by: Process System Design Technology Center of the Ministry of Chemical Industry Approved by: Chemical Industry
Implementation date: November 1, 1994 Line description
This standard recommends that the grid modulus M=2.5mm be used for flow charts. The classification and width of lines are as follows: 1.0.1 Thick lines: The line width is 0.4m, i.e. 1.0mm. Used for main process material pipelines, main product pipelines and equipment position lines; main category auxiliary materials, main category public engineering material pipelines
1.0.2 Medium lines: The line width is 0.2m, i.e. 0.5mm. Used for secondary material product pipelines and other auxiliary material pipelines; equipment and machinery graphic symbols (border lines and internal and external component lines), rectangular boxes representing equipment and public engineering stations, etc.; graphic connection marks of pipelines; boundary marks and boundary lines of pipelines.
1.0.3 Thin lines: The line width is 0.1m, i.e. 0.25mm. It is used for graphic symbols such as valves, pipe fittings, and instruments, instrument pipelines, area lines: dimension lines; various marking lines; range lines, lead lines; reference lines; table lines; dividing lines; insulation layer lines; accompanying pipes and casing lines: special parts number boxes and other auxiliary lines.
Pipeline and lines
Main material pipeline
Secondary material pipeline
Auxiliary material pipeline and
Equipment outline
Lead line, dimension
Line, pipe fittings, valves,
Instrument graphic symbols and
Instrument pipeline, etc.
Original pipeline (original
equipment outline)
Underground pipeline (buried
and underground trench)
Steam tracing pipeline
Pipeline and line graphic symbols
General symbols
Special symbols
Pipe diameter marking
( DN25）
Thick line
Medium line
Thin line
Heating pipe only indicates
Electric heating pipe
Cooling pipe
Special heating pipe
Jacketed pipe (casing)
Insulation layer pipe
Pipe dividing line
Insulation layer dividing line
General symbol
Special symbol
Continued table 2
Electric heating pipe only indicates
Indicates one section
Cooling pipe only indicates
Special heating pipe
Indicates one section
Jacketed pipe only indicates|| tt||The insulation layer only indicates
The boundary line of the companion pipe
The identification letter "T"
The same as the functional
type code of the companion pipe
The boundary line of the insulation layer
The identification letter "H"
The same as the functional
type code of the insulation layer
The boundary line of the jacketed pipe
Finned tube
Above-ground and underground pipelines
Equipment and pipelines that are not within the scope of this design and are to be
constructed in the future
General symbols
Special symbols
Table 2 continued||tt ||Boundary line of jacketed pipe
Identification letter "J\"
The same distance as the functional type code of the jacketed pipe, each section represents six fins,
Fin line is a thin line
Circle diameter is 3mm
Circle is a thin line
Pipeline crossing (not connected) and pipeline connected
General symbol
Special symbol
First representation method
Pipeline crossing (not connected)
Pipeline connected
Continued Table 2
Pipeline crossing (not connected) and pipeline connected| |tt||General symbols
Special symbols
Second method of expression
Pipe crossing (not connected)
Pipe connected
Continued Table 2
Only one expression method can be used in a set of drawings, and both expressions cannot be used
Diameter of black dot
Pipe crossing (not connected
and pipeline connected
Siphon (liquid seal pipe)
Boundary line
Different design units
Division of labor scope line
Complete equipment scope line
General symbols||tt ||Special symbols
Continued table 2
Middle line
Thin line
Thin line
Responsibility scope expression
Responsibility scope expression
Special instructions and notes
Resolution scope linebzxz.net
Modification scope line
General symbols
Special symbols
Continued table 2
Thin line
WE comes with the equipment
Supply as a complete set
BB is the responsibility of the buyer
The responsibility of the manufacturer
The responsibility of the factory
BS is the responsibility of the seller
The responsibility of the instrument
Thin line
Thin lines
Flow direction and indication arrows
Drawing connection of pipelines (instrument signal
Lines)
Boundary connection of pipelines
General symbols
Special symbols
First method of expression
Second method of expression
Enter drawing
Out of drawing
Enter boundary area
Exit boundary area
Continued Table 2
Angle of arrow head
45°~60°
Only one method of expression can be used in a set of drawings
Middle line
Middle line|| tt||Design condition filling box
Interface symbol
Pipeline grade (material), boundary symbol of pipeline number
Public engineering station
(Public material station)
Steam distribution pipe
Condensate collection pipe
Represents unit operation, rectangle of process equipment
General symbol
Special symbol
Pressure and temperature
Design temperature ℃
Design pressure MPa
Continued Table 2
Measurement unit should be marked in the box as needed. The pressure value is absolute pressure. If it represents gauge pressure, it should be marked (gauge).
Fill in the box line width
Thin line
Head angle 30°
Thin line
Thin line
Thin line
Rectangle is not specified
Middle line
Rectangle is not specified
Middle line
Rectangle is not specified
Middle line
Rectangle is not specified
Middle line
Number box for sampling, special pipes
(valves)
Steel platform, operation
Brickwork, concrete, fire-resistant
brick, soil and ground
Number of pipe openings on equipment
Equipment cut-off (division)
Liquid level of glass tube (plate)
Equipment insulation layer
Modification mark symbol
General symbol
Special symbol
Continued Table 2
Square
Thin line
Thick line
Thin line
Numbering box is thin line
Division line is thin line
Thin line
Insulation layer line is
Thin line
The "1" in the triangle indicates the
first modification
Thin line
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