This standard applies to drawings drawn by the following drawing methods: 1. Manual drawing; 2. Computer drawing. This standard applies to the following engineering drawings of HVAC: 1. Design drawings and completion drawings of each stage of new, rebuilt and expanded projects; 2. Measured drawings of existing buildings, structures, etc.; 3. General design drawings and standard design drawings. GB/T 50114-2001 HVAC Drawing Standard GB/T50114-2001 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB/T50114—2001
Standard for heating, ventilation and air conditioning drawings
2001—11—01 Issued
2002—03—01
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and Ministry of Construction of the People's Republic of China
Jointly issued
Page 1 of 29
National Standard of the People's Republic of China
Standard for heating, ventilation and air conditioning drawings
Standard for heating, ventilation and air conditioning drawings drawings
GB/T50114-2001
Editor: Ministry of Construction of the People's Republic of ChinaApproval: Ministry of Construction of the People's Republic of ChinaEffective date: March 1, 2002
China Construction Information Network
2002 Beijing
Page 2 of 29 pages
Notice of the General Administration of Customs on the promulgation of six national standards including the "Uniform Standard for Building Architectural Drawings"
Construction Standard [2001] No. 220
According to the "Notice on Issuing the 1998 Construction Standards" issued by the Ministry of Construction In accordance with the requirements of the Notice on the Formulation and Revision Plan of National Standards for Construction Engineering (Second Batch) (Jianbiao [1998] No. 244), the Ministry of Construction, together with relevant departments, has jointly revised six standards including the "Uniform Standard for Building Architectural Drawings". After review by relevant departments, the "Uniform Standard for Building Architectural Drawings" GB/T50001-2001, the "General Drawing Standard" GB/T50103-2001, the "Architectural Drawing Standard" GB/T50104-2001, the "Architectural Structure Drawing Standard" GB/T50105-2001, and the "Water Supply and Drainage System Standard" are now approved. The "Unified Standard for Building Architectural Drawing" GB/T50106-2001 and "HVAC Drawing Standard" GB/T50114-2001 are national standards and will be implemented on March 1, 2002. The original "Unified Standard for Building Architectural Drawing" GBJ1-86, "General Drawing Standard" GBJ103-87, "Architectural Drawing Standard" GBJ104-87, "Architectural Structure Drawing Standard" GBJ105-87, "Water Supply and Drainage Drawing Standard" GBJ106-87 and "HVAC Drawing Standard" GBJ114-88 are abolished at the same time. This standard shall be replaced by the Construction The Ministry is responsible for management, the China Building Standard Design Institute is responsible for specific interpretation, and the Standard and Quota Research Institute of the Ministry of Construction organizes the China Planning Press to publish and distribute. Ministry of Construction of the People's Republic of China
November 1, 2001
Page 3 of 29 pages
According to the task assigned by the Ministry of Construction's Document No. 1244 [19981244] "Notice on Issuing the 1998 National Standard Formulation and Revision Plan for Engineering Construction (Second Batch)", the drafting group of this standard has revised the "HVAC Drawing Standard" (GBJ114-88). The drafting group first proposed a draft for soliciting opinions based on the feedback collected in 1990 and widely solicited opinions from the whole country, and then proposed a draft for review, which was then approved by letter review and expert review, so that it has a good mass base.
The purpose of revising this standard is:
1. To coordinate and be consistent with the relevant national standards in "Technical Drawing" issued and implemented since 1990 (including the relevant standards of ISOTC/1C) in terms of technical content. 2. Fully consider the respective characteristics of manual drawing and computer drawing, and take into account the needs of both and new requirements. 3. Modify, delete or supplement the legends, expressions and drawing rules that are not suitable for current use or outdated to make them more in line with actual work needs. This standard is a recommended national standard.
This standard is interpreted by the China Building Standard Design Institute. If there is a need for modification or supplementation during the application process, please send your opinions or relevant information to the institute (No. 19 Chegongzhuang Street, Xiwai, Beijing, Postal Code 100044) for reference during revision.
Editor and main drafter of this standard
Editor: China Building Standard Design Institute Main drafter Wang Weiquqian
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General provisions
3 Commonly used illustrations
Water, steam pipelines,
HVAC equipment
Control devices and instruments
Drawing methods
General provisions
Pipeline and equipment layout plan, surface and detailed drawings Pipeline system drawings , schematic diagram
system number.
pipe elevation, pipe diameter (pressure), dimension marking 4.6 Drawing methods for pipe turns, branches, overlaps and dense areas Explanation of terms used in this standard
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1 General
This standard is formulated to unify the drawing rules of HVAC, ensure the drawing quality, improve the drawing efficiency, make the drawings clear and concise, meet the requirements of design, construction and archiving, and meet the needs of engineering construction. 1.0.2
This standard applies to drawings drawn by the following drawing methods: manual drawing;
computer drawing.
This standard applies to the following engineering drawings of HVAC: design drawings and completion drawings of each stage of new, rebuilt and expanded projects; measured drawings of existing buildings, structures, etc.; general design drawings and standard design drawings.
HVAC professional drawings shall comply with the provisions of the "Unified Standard for Building Architectural Drawings" 50001-2001) and the relevant mandatory standards currently in force in China in addition to this standard. Page 6 of 29
2 General Provisions
2.1 Drawing Lines
The basic width b and line width group of the drawing lines shall be determined according to the scale, category and usage of the drawing. 2.1.1
The basic width b should be 0.18, 0.35, 0.5, 0.7, 1.0 mm. 2.1.2
When only two line widths are used in the drawing, the line width group should be b and 0.25b. The line width group of three line widths should be b, 0.5b and 0.25b. As shown in Table 2.1.3. Table 2.1.3
Line width table
Line width group
Line width (mm)
In the same drawing, thin lines of different line width groups can uniformly adopt the thin lines of the smallest line width group. The line types and their meanings used in HVAC professional drawings should comply with the provisions of Table 2.1.5. Table 2.1.5 Line types and their meanings
Pipes represented by single lines
General use
Outlines of equipment in this profession, outlines of pipelines represented by double lines, outlines of buildings; dimension, elevation, angle and other annotation lines and lead-out lines; outlines of equipment not in this profession
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Wavy line
Single-point long line
Double-point long line
Break line
Continued Table 2.1.5||tt ||Return pipeline
General purpose
Outline of equipment and pipelines in this specialty that are blocked Outline of underground trenches and air ducts before renovation: Schematic connection
Hose represented by a single line
Break boundary
Axis, center line
Imaginary or process equipment outline
Break boundary
Customized lines and meanings can also be used in drawings, but they should be clearly stated, and their meanings should not be contrary to this standard.
The proportions of the general plan and plan should be consistent with the leading specialty of the project design, and the rest can be selected according to Table 2.2.1
2.2.1.
Sectional drawing
Local enlarged drawing, trench section drawing
Index drawing, detailed drawing
Common scale
Available scale
1:50, 1:100,
1:150, 1:200
1:20, 1:50,
1: 1.
1:2、
1:10、
1:5、
1:30、
1:50、
1:3、
1:40、
1:4、
1:15
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Common Legends
Water and Steam Pipelines
Water and steam pipeline codes should be selected according to Table 3.1.1. Table 3.1.1 Water and Steam Pipeline Codes
Pipeline Name
1.When using thick solid lines and thick dotted lines to distinguish water supply and return water, it can save (for heating, life, and process)
hot water pipes
steam pipes
condensate pipes
expansion water pipes, sewage pipes,
exhaust pipes, bypass pipes
make-up water pipes
drain pipes
circulation pipes, signal pipes
overflow pipes
air conditioning cold water pipes
air conditioning cold/hot water pipes
air conditioning cooling water pipes
air conditioning condensate pipes
softened water pipes
deoxidation Water pipe
Brine pipe
Fluorine steam pipe
Fluorine liquid pipe
Omit code
2. Arabic numerals 1 and 2 can be added to distinguish between water supply and return water 3. Arabic numerals 1, 2, 3 can be added to indicate multiple pipes with different parameters under one code
When it is necessary to distinguish between saturated, superheated, and self-use steam, B, G, and Z can be added before the code respectively
When it is necessary to distinguish, a lowercase pinyin letter can be added after the code, that is, Pz, Pw, Pq, Pt
Circulation pipes are thick solid lines, and signal pipes are thin dotted lines. If it does not cause misunderstanding, the circulation pipe can also be "X"
White definition The code of water and steam pipelines should avoid contradictions with Table 31.1, and should be explained on the corresponding drawings. The legend of valves and accessories of water and steam pipelines should be adopted according to Table 3.1.3. Page 9 of 29
Valves (general purpose), cut-off valves
Manual regulating valves
Ball valves, rotary valves Www.bzxZ.net
Balancing valves
Three-way valves
Four-way valves
Throttle valves
Expansion valves
Quick release valves
Check valves
Pressure reducing valves
Safety valves
Table 3.1.3 Water , Steam pipeline valves and accessories
1. If there is no description, it means threaded connection
When flange connection
When welding—
2. How to draw an axonometric diagram
The valve stem is vertical
The valve stem is horizontal
Also called "diaphragm valve"
Also called quick drain valve
The left picture is universal, and the right picture is a lifting check valve, with the same flow direction as the left. The rest are similar to the valves
The small triangle in the left picture is the high-pressure end, and the right side of the right picture is the high-pressure end. The rest are similar to the valves.
The left picture is general, the middle is a spring safety valve, and the right is a heavy hammer safety valve
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Steam trap
Float valve
Gas collecting tank, exhaust device
Automatic exhaust valve
Sewage remover (filter)
Throttling orifice plate, pressure reducing orifice plate
Compensator
Rectangular compensator
Casing compensator
Bellows
Compensator
Continued Table 3.1.3
When it does not cause misunderstanding,
The left picture is a plane view
It can also be used
Also called "steam trap"
The left is a vertical dirt remover, the middle It is a horizontal dirt remover, and the right is a Y-type filter. When it does not cause misunderstanding, it can also be expressed by ··—. It is also called "expansion device". Page 11 of 29. Compensator. Compensator. Reducer. Reducer. Flexible joint. Flange cover. Flexible rubber joint. Metal hose. Insulation pipe. Protective sleeve. Heating pipe. Fixed bracket. Flow direction of medium. Slope and slope. Table 3.1.3 continued. Meters-*+*. i=0, (03
The left picture shows a concentric reducer, and the right picture shows an eccentric reducer
It can also be expressed as:
It can also be expressed as:·-
When the pipeline is disconnected, the flow direction symbol should be marked on the center line of the pipeline, and the rest can be marked at the same position as the pipe diameter. The slope value should not be marked at the same time as the elevation of the starting and ending points of the pipeline. The marking position is the same as the pipe diameter marking position. 3.2 Air duct
The air duct code should be adopted according to Table 3.2.1.
Air duct name
Air conditioning duct
Supply air duct
Fresh air duct
Air duct code
Air duct name
Return air duct (1 and 2 can be added to distinguish the primary and secondary return air) Exhaust duct
Smoke exhaust duct or exhaust and smoke exhaust common duct
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