HG/T 20645.2-1998 Chemical Plant Pipeline Mechanical Design Engineering Regulations HG/T20645.2-1998 Standard download decompression password: www.bzxz.net

Chemical Plant Pipeline Machinery Design Engineering Regulations HG/T20645.2—1998
Scope of Application
This regulation applies to the design of pipeline machinery in chemical plants. The design of pipeline machinery outside the plant can also be implemented by reference. Since the content of the regulations is universal, when carrying out the design of specific engineering projects, the project design manager (person in charge) can make appropriate supplements or adjustments to this regulation according to the project contract provisions and characteristics, and publish and implement it after approval.
1 Contract number;
Project number;
Project name;
Factory address;
Product and scale;
Design unit name:
File coding regulations;
Measurement unit regulations.
According to the contract provisions
Key points of regulations
2.1 Overview
When there is no clear provision in the contract, it shall be implemented in accordance with the current national statutory measurement unit regulations. Written provisions
According to the contract provisions.
When there is no clear provision in the contract, Chinese shall be used. 2.2 Design basis
Standards and specifications (or regulations) used in the design 2.2.1
Design specification for chemical pipelines (HGJ8).
2 Steel pressure vessels (GB150).
3 Standard drawing of pipe racks (HGI524).
2.3 Calculation procedures
2.3.1 Pipe system flexibility analysis and stress calculation procedures. 2.3.2 Pipe system dynamic analysis calculation procedures
1 Complex piping system gas column natural frequency calculation procedures. 2 Air flow pulsation calculation procedures.
Pipe system structure vibration calculation procedures.
2.4 Design and installation temperature
Design temperature
It is advisable to use the pipeline design temperature determined and provided by the process system professional. 1
2Under special circumstances, the normal maximum operating temperature may be taken as the design temperature. 2.4.2 Installation temperature
1Under normal circumstances, 20℃ may be used as the installation temperature. 2Under special circumstances, it may be determined separately according to specific circumstances. 2.5 Design pressure
2.5.1The pipeline design pressure determined and provided by the process system professional shall be adopted. 2.5.2Under specific circumstances, the normal maximum operating pressure may be taken as the design pressure. 2.6 Design load and influence
2.6.1 Temperature load
The influence of displacement stress (secondary stress) caused by thermal expansion (or cold contraction) restrained on the piping system shall be considered. 2.6.2 Pressure load
Mainly for the strength check of pipelines and pipe fittings and the influence of primary stress caused by internal pressure or external pressure on the piping system.
2.6.3 Mass load
Includes the mass load of pipelines and additional structures, the mass load of fluids (including the water pressure test part), the mass load of insulation layers, and the impact of primary stress generated by the mass load of ice or snow on the piping system. 2.6.4 Dynamic load
1 Impact load
Mainly refers to the impact of phase change of fluids and other impact forces on the piping system. 17
2 Wind load
Refers to the impact of wind pressure on the outdoor overhead piping system, that is, considering the impact of wind pressure load. 3 Earthquake load
The impact of horizontal force generated by earthquakes on the piping system. 4 Vibration load
In order to prevent and eliminate the damage caused by severe vibration or resonance to the piping system, dynamic analysis calculation (calculation of natural frequency of air column, calculation of air flow pulsation, calculation of piping structure vibration) should be carried out on the specified piping system to ensure the safe operation of the piping system.
5 Fluid discharge reaction force
Including the impact of the reaction force generated by safety valves, pressure reducing valves, etc. and other variable speed discharges on the piping system. 6 When dealing with dynamic loads, they should be considered separately. However, when wind loads and seismic loads exist at the same time, it is not appropriate to treat them as superposition, but to take the larger value of the two. 2.7 Basic parameters required for design
2.7.1 Parameters determined and provided internally
Including relevant basic parameters or conditions provided by this profession and other professions. 2.7.2 Parameters determined and provided externally
1 Calculate the basic wind pressure value g (MPa) at a height of 10m required for wind load, and calculate the wind pressure values ​​at different heights.
2 Average maximum ice and snow load.
3 Basic earthquake intensity.
4 Soil property (chemical and mechanical) parameters. 5 Relevant test parameters and requirements.
Flexibility analysis and stress calculation of piping system
3.1 Calculation conditions
3.1.1 Determine the critical piping system that needs flexibility analysis and stress calculation1 The person in charge of piping machinery shall first propose a list of critical piping systems for the project, and at the same time seek the opinions of the person in charge of process system, the person in charge of piping layout and the design manager2 Send the formally confirmed list of critical piping systems to the person in charge of piping layout and the design manager. 3.1.2 Documents and materials required for calculation Preparation of piping naming table (provided by process system). 1
Stress calculation axonometric drawing (provided by piping layout). Pipe material engineering design regulations (provided by material control). Device layout drawing (provided by equipment layout) General drawing of relevant equipment (provided by equipment). 5
Structural template drawing (including steel structure, platform, etc.) (provided by structure). 7
Building plane, elevation and section drawings (provided by architecture). Preparation of relevant data of pipe machinery. Flexibility analysis and stress calculation
Design input.
Calculate according to the program requirements.
3.3 Calculation result processing
3.3.1 Pipe systems that passed the calculation
Fill in the list of pipe system flexibility and stress, and mark the pass mark on the stress calculation axonometric drawing (submit a copy to the pipeline layout department).
3.3.2 Pipe systems that failed the calculation
The pipeline machinery department will make improvement suggestions and return to the pipeline layout department for modification, and then calculate again until it passes.
Dynamic calculation of reciprocating compressor inlet and outlet pipelines 4
4.1 Calculation conditions
4.1.1 Determine the pipe system that needs to be calculated for dynamics 1 The person in charge of the pipeline machinery department shall first propose a list of calculated pipe systems for the project, and at the same time seek the opinions of the person in charge of the process system department, the person in charge of the pipeline layout department and the design manager. 2Send the officially confirmed list of calculated pipe systems to the person in charge of the pipeline layout department and the design manager. 4.1.2. Documents and materials required for calculation Preparation of pipeline naming table (provided by process system major). 1
Power calculation axonometric sketch (provided by pipeline layout major). 2
Pipe material engineering design regulations (provided by material control major). Device layout drawing (provided by equipment layout major). Compressor equipment drawing (provided by machine pump major). The mechanical parameters of compressor operation (not available in the equipment drawing) are provided by the manufacturer. Process gas medium parameters (provided by process major). Structural template drawing (including steel structure, platform, etc.) (provided by structure major). 8
Building plan, elevation and section drawings (provided by architecture major). Preparation of relevant data of pipeline machinery major itself. 4.2Power calculation
Design input.
Calculate according to the program requirements
4.3 Processing of calculation results
4.3.1 For the pipe system that passed the calculation
, mark it as passed on the calculation axonometric drawing, make a copy and provide it to the pipeline layout engineer. After the pipeline material engineer makes a pipeline material statistics table, provide it to the compressor manufacturer in preparation for the manufacturer to provide compressor accessories. 4.3.2 For the pipe system that failed the calculation
, negotiate with the pipeline layout engineer to modify the design, and then repeat the dynamic calculation, and repeat this process until it passes.
5 Verification calculation and explanation with relevant professionals
5.0.1 Carry out targeted verification calculation according to the actual situation of the project. 5.0.2 According to the pipeline plan layout and static calculation results, determine the fixed or sliding support position of the heat exchanger and provide it to the equipment professional and equipment layout professional. 5.0.3 When the thrust and moment of the equipment in the static analysis calculation results exceed the allowable value or the equipment professional does not provide the allowable value of the pipe mouth force, it shall be submitted to the equipment engineer for local stress verification calculation and processing. 23
6 Provisions related to civil engineering
6.0.1 Due to the requirements of pipeline flexibility, the settlement difference range should be negotiated and determined with the civil engineering professional, and effective preventive measures should be taken.
6.0.2 Provide conditions to the civil engineering professional in accordance with relevant regulations 1 The load of the pipe support and hanger is marked on the civil engineering condition diagram. 2 When the force and moment exceed the allowable force and moment of civil engineering components (beams, columns, slabs, walls, roofs, etc.), conditions should be proposed to the civil engineering professional.
3 Provide the embedded parts conditions that meet the requirements of the pipe rack to the civil engineering professional. 24
7 Design of pipe support and hanger
7.1 Pipe span
7.1.1 The basic span of the pipeline, the span of the pipeline considering the impact of earthquakes, and the guide span of the vertical pipeline are specified in Chapter 15 of the "Technical Regulations for Mechanical Design of Pipelines in Chemical Plants" (HG/T20645.5-1998). 7.1.2 The span of the pipeline with pulse vibration shall be determined by the design engineer at his discretion. 7.2: Pipe rack design
7.2.1 Determination of the position of the pipe rack
The span of the load-bearing pipe rack should not be greater than the basic span of the pipeline. 1
2 Make full use of the existing civil structure components and beams and columns of the pipe gallery for support. 3 For all pipelines that are subjected to stress calculation, the position of the pipe rack is determined according to the analysis results, and the possibility of support should be considered. 4 Make a load-bearing frame near the elbow of the vertical pipe section, or above the center of gravity of the vertical section. When the vertical section is long, a guide frame can be added at the bottom
5 Set a load-bearing frame near the pipeline components with large concentrated loads. 6 For pipelines with mechanical vibration, resonance should be avoided when considering the span. 7 For the convenience of maintenance, it is best not to make temporary pipe racks when dismantling pipe sections. 7.2.2 Loads acting on pipe supports and hangers For pipe rack loads rooted on equipment, the larger value of the operating load and the test load shall be adopted. 1
2 For pipe rack loads rooted on the ground, the operating load shall be adopted. 3 For pipe rack loads rooted on civil engineering components, the larger value of the operating load and the test load shall be adopted. 4 For spring support and hanger loads, the operating load shall be adopted. 7.2.3 Pipe rack rootingwwW.bzxz.Net
1 Pipe rack foundation on the ground
1) The pipe rack foundation close to the pump should be integrated with the pump foundation, or rooted on the pump foundation when conditions permit. 2) To avoid damage due to settlement differences, the first pipe rack on the pipeline that adopts a non-flexible connection with the tank connection port must be placed far enough away from the tank. The minimum distance between the pipe rack position and the tank is shown in Table 7.2.3. 25
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