Some standard content:
Industry Standard of the People's Republic of China
HG / T 20644 - 1998
Variable spring supports
1998-06-22 Issued
State Administration of Petroleum and Chemical Industry
1999-01-01
Document of State Administration of Petroleum and Chemical Industry
Guo Shi Hua Jian Fa (1998) No. 84
Notice on Issuing Nine Industry Standards Including "Regulations on Piping Layout Design of Chemical Plants"
To the Chemical Industry Departments (Bureaus, Companies) of all provinces, autonomous regions, municipalities directly under the Central Government, and cities with independent planning status, and all relevant units: The nine standards including "Regulations on Piping Layout Design of Chemical Plants" organized and compiled by the relevant design and technology centers have been reviewed and approved as recommended industry standards and will be implemented from January 1, 1999. The standard name, number, organizing unit and chief editor are detailed in the table below. The National Chemical Engineering Construction Standards Editorial Center is responsible for publishing and distributing the standard. State Administration of Petroleum and Chemical Industry
June 22, 1998
Standard Name
Design Provisions for Piping Arrangement of Chemical Plants
Design Provisions for Automatic Control Engineering of Chemical Plants
Design Management Provisions for Automatic Control Specialty
Regulations for the Preparation of Design Documents for Automatic Control Specialty Engineering
HG/T 20549 -
HG/T 20636 -
HG/T 20637
HG/T20638-
Regulations for the Depth of Design Documents for Automatic Control Specialty Engineering
HG/T 20639
For Automatic Control Specialty Engineering Design!
Typical Diagrams and Standard Catalog
Mechanical Design of Piping in Chemical Plants!
HG/T 20645 -
Design regulations
General model design regulations
HG/T 20647 -
Equipment layout model design regulationsHG/T20648-
General layout transportation design of chemical enterprises
HG/T 20649 -
Design regulations
Chemical enterprise automobile transportation design
Operation cost calculation regulations
Chemical enterprise railway transportation design
Operation cost calculation regulations
Variable force spring support
HG/T 20650 -
HG/T 20651 -
HG/T 20644 -
Organizing Unit
National Chemical Process Piping Design Technology Center Station
National Chemical Automatic Control Design Technology Center Station
Editing Unit
National Chemical Process Piping Design Technology Center Station
China Chengda Chemical Engineering Co., Ltd.
National Chemical Process Piping Design Technology Center Station
National Chemical Model Design Technology Center Station
National Chemical Model Design Technology Center Station
National Chemical Engineering General Layout Transportation Design Technology Center Station
National Chemical Engineering General Layout Transportation Design Technology Center Station
National Chemical Engineering General Layout Transportation Design Technology Center Station
National Chemical Process Piping Design Technology Center Stationbzxz.net
Technical Center Station
National Chemical Engineering General Layout Transportation Design Technology Center Station
China Tianzhan Chemical Engineering Co., Ltd.
Jilin Chemical Group Design Institute
Shanghai Chemical Engineering Design Institute
Industry Standards of the People's Republic of China
Variable Force Spring Support and Hanger
Variable spring supports
HG/T 20644 -- 1998
Editor: Shanghai Chemical Engineering Design Institute
Approval department: State Petroleum and Chemical Industry Bureau Implementation date: January 1, 1999 National Chemical Engineering Construction Standard Editing Center (formerly the Engineering Construction Standard Editing Center of the Ministry of Chemical Industry) Beijing
This standard is organized by the National Chemical Process Piping Design Technology Center (formerly the Chemical Process Piping Design Technology Center of the Ministry of Chemical Industry) and edited by Shanghai Chemical Engineering Design Institute according to the plan and arrangement of the No. 90 document issued by the Construction Coordination Department of the former Ministry of Chemical Industry (1996).
This standard specifies the types, sizes and technical requirements of variable force spring supports. This standard is based on the original chemical design standard CD42B5-89 (Selection Instructions for Variable Spring Supports and Hangers), and is revised after investigations of the former Ministry of Chemical Industry, the design institutes affiliated to Sinopec Corporation, and the spring support and hanger manufacturers. The main changes are as follows:
1. Fourteen types of spring supports and hangers, including VS150A~G and VS180A~G, have been added to meet the demand for large displacement brackets.
2. Appropriate adjustments and supplements have been made to the types of F-type spring supports and hangers: the original F-type (ordinary load) has been retained. The original F type was changed to F type (with roller load plate type), and the type with polytetrafluoroethylene load plate was added and defined as F type.
3. The threaded hanger rods and basket nuts M48×3, M56×4, and M64×3 fine pitch threads used in the original standard were changed to M48, M56, and M64 respectively, so as to match the dimensions in the HG524-91 pipe rack standard drawing. 4. For ease of installation, the outer dimensions of the D, E, and F type base plates are appropriately adjusted. If there are any deficiencies in the use of this standard, please provide feedback in a timely manner. Unit: National Chemical Process Piping Design Technology Center Editor: Shanghai Chemical Engineering Design Institute
Main Drafters: Wu Fudi, Jiang Peixiong, Luo Aidi, Luo Zhifan1
Subject content and scope of application
Referenced standards
Structure, type, model selection
Dimension series·
Technical requirements
Paint, packaging, marking
Appendix A
Installation and use instructions·
Table of contents
1Subject content and scope of application
This standard applies to pipe and equipment supports with vertical displacement. 1.0.1
1.0.2 This standard specifies the types, sizes and technical requirements of variable force spring supports and hangers. 1.0.3
The displacement range of variable force spring supports and hangers is 30, 60.90, 120, 150 and 180 mm in six grades: the load range is 154~217381N
The ambient temperature for use is -19℃～200℃. 2
GB1239.1~1239.5-89
GB/T 1804 - 92
GB 196 - 81
GB 197-81
GB 985 - 88
GB 700 -88
JB 4726-94
GB 191 -90
JB 2536 -80
Referenced standards
《Cylindrical helical springs》
《General tolerances for linear dimensions without tolerances》
《General thread basic dimensions》
《General thread tolerances and fits》
《Basic forms and dimensions of weld grooves for gas welding, manual arc welding and gas shielded welding》
《Carbon structural steel》
《Carbon steel and low alloy steel forgings for pressure vessels》
《Painting, packaging and transportation of pressure vessels》3. Selection of structure, type and model
3.1. Structure
3.1.1. The variable force spring support and hanger is mainly composed of cylindrical helical springs, indicator plates, housings, basket nuts and positioning blocks. The typical structure is shown in Figure 3.1.1
Strong pre-pass present Yaji
Typical structure
Type selection
Displacement indicator plate
Basket nut
Variable force spring support and hanger are divided into seven types: A, B, C, D, E, F, and G according to the installation type: Type A: upper thread suspension type
Type B: single ear suspension type
Type C: double ear suspension type
Type D: upper adjustment shelving type
Type E: lower adjustment shelving type
Type F: support shelving type
Type G: parallel suspension type
The selection of variable force spring support and hanger type is mainly based on factors such as the rooting structure, pipeline spatial position and pipeline support and suspension method:
Types A, B and C are suspension type hangers. The upper end of the hanger is connected to the hanger rod or hanger plate, and the other end of the hanger rod and hanger plate is connected to the steel beam or floor slab. The lower end is connected to the hanger rod and pipe with a basket nut. See Figure 3.2.2-1A, 3.2.2-2B, 3
C.
Figure 3.2.2-1
Figure 3.2.2-2B
Figure 3.2.2 -3
2D and E are shelving type hangers. The bottom plate is shelved on the steel beam or floor slab, and the pipe is suspended by the hanger rod at the lower end. See Figure 3.2.2-4D and Figure 3.2.2~5E.
3F is a supporting shelving type bracket. The bottom plate is shelved on the foundation, floor or steel structure, and the pipe is supported on the top of the bracket by the legs. See Figure 3.2.2-6F.
F-type spring hangers can be divided into three types: ordinary load plate (Fi type), load plate with polytetrafluoroethylene (Fn type), and load plate with roller (F type). When the horizontal displacement of the pipeline is greater than 6mm, it is recommended to use F or F type. 4G type is a parallel suspension type hanger. When the spring hanger cannot be directly suspended above the pipeline or there is not enough height to suspend it, or the vertical load of the pipeline exceeds the range that a single spring hanger can bear, the G type hanger can be used. When selecting the G type hanger, half of the calculated load should be used as the basis for selecting the spring number. See Figure 3.2.27G type. 3.3.1
Figure 3.2.2-5
Model selection
The variable force spring hanger model consists of the following four parts: Figure 3.2.2-6
Spring number (0~24)
Type (A, B, C, D, E, FI, FI, F, G)Working displacement range (30, 60, 90, 120, 150, 180)Variable force spring hanger code
For example: VS90F15 means that the allowable working displacement range is 90mm, supporting shelving type ordinary load plate variable force spring hanger, spring number 15.
3.3.2The selection of spring hanger category and spring number can be determined according to the working load of the pipeline during operation [including materials, all pipeline components (such as pipelines, valves, pipe fittings, insulation materials, etc.) 1, vertical working displacement, displacement direction, refer to Table 3.3.3 to determine.
3.3.3, Spring load selection table 3.3.3, consists of spring number, spring support bracket type, working displacement range, spring stiffness, etc. The table is divided into two areas by the center line, and the area between the upper thick straight line and the lower thick straight line is the best working range. 3.3.4 Example of selection based on spring load selection table and selection method: 1 When the displacement direction of the pipeline is upward during operation, the working load can be found between the center line and the upper thick straight line in table 3.3.3, and then the installation load can be found downward according to the displacement. When the displacement direction of the pipeline is downward during operation, the working load can be found between the center line and the lower thick straight line in table 3.3.3, and then the installation load can be found upward according to the displacement. When selecting the spring number, regardless of whether the displacement of the pipeline is upward or downward during operation, the working load and the installation load must be between the upper and lower thick true lines in table 3.3.3. When the displacement is small, the working load and the installation load may be between the center line and a certain thick straight line. The load change rate of the spring number selected according to the above situation does not exceed 25%, and the selected spring number is the table. The load change rate can be calculated by the following formula: Load change rate three
. Positive load-installation load
Working load
×100%≤25%
Wherein: When the pipeline displacement is upward, the installation load-working load+displacement×spring stiffness When the pipeline displacement is downward, the installation load=working load-displacement×spring stiffness. If the spring load change rate is greater than 25%, the spring stiffness should be reduced to select a larger working displacement range, check the installation load, and then verify the load change rate. When the installation load found falls outside the upper and lower rough straight line range, the spring stiffness should be reduced to select a larger working displacement range, check the installation load, and then verify the load change rate. When the load change rate cannot be less than or equal to 25%, a constant force spring support can be selected. 2 Examples
1) Example 1: The working load of a pipe is 7628N, and the displacement is upward during operation, with a displacement of ·10mm. According to the pipeline installation requirements, a type A spring hanger is used. Try to select the spring hanger model: check Table 3.3.3, and temporarily determine the spring hanger type as VS30; check between the center line and the upper thick line in Table 3.3.3 to find that the working load of spring No. 13 is 7628N; 6Positive load - installation load
Working load
×100%≤25%
Where: When the pipeline is displaced upward, the installation load is - working load + displacement × spring stiffness. When the pipeline is displaced downward, the installation load = working load - displacement × spring stiffness. If the spring load change rate is greater than 25%, the spring stiffness should be reduced to select a larger working displacement range, check the installation load, and then verify the load change rate. When the installation load is found to fall outside the upper and lower rough straight line range, the spring stiffness should be reduced to select a larger working displacement range, check the installation load, and then verify the load change rate. When the load change rate cannot be less than or equal to 25%, a constant force spring support can be used. 2 Examples
1) Example 1: The working load of a pipe is 7628N, and the displacement is upward during operation, and the displacement is ·10mm. According to the pipeline installation requirements, use type A spring hanger. Try to select the spring hanger model: check Table 3.3.3, and tentatively determine the spring hanger type as VS30; check between the center line and the upper thick straight line in Table 3.3.3 to find that the working load of spring No. 13 is 7628N; 6Positive load - installation load
Working load
×100%≤25%
Where: When the pipeline is displaced upward, the installation load is - working load + displacement × spring stiffness. When the pipeline is displaced downward, the installation load = working load - displacement × spring stiffness. If the spring load change rate is greater than 25%, the spring stiffness should be reduced to select a larger working displacement range, check the installation load, and then verify the load change rate. When the installation load is found to fall outside the upper and lower rough straight line range, the spring stiffness should be reduced to select a larger working displacement range, check the installation load, and then verify the load change rate. When the load change rate cannot be less than or equal to 25%, a constant force spring support can be used. 2 Examples
1) Example 1: The working load of a pipe is 7628N, and the displacement is upward during operation, and the displacement is ·10mm. According to the pipeline installation requirements, use type A spring hanger. Try to select the spring hanger model: check Table 3.3.3, and tentatively determine the spring hanger type as VS30; check between the center line and the upper thick straight line in Table 3.3.3 to find that the working load of spring No. 13 is 7628N; 6
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