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This post was finally edited by Mixiang Gobi on October 21, 2015 at 14:41
Contents of HG/T 20570-95 Technical Regulations for Engineering Design of Process Systems (full set)
HG/T 20570.1-95 Determination of Design Pressure and Design Temperature of Equipment and Piping Systems
HG/T 20570.2-95 Setting and Selection of Safety Valves
HG/T 20570.3-95 Setting and Selection of Rupture Discs
HG/T 20570.4-95 Differential Pressure Analysis of Pumps and Compressors
HG/T 20570.5-95 Calculation of Pump System Characteristics and Determination of Relative Installation Height of Equipment
HG/T 20570.6-95 Pipe Diameter Selection
HG/T 20570.7-95 Calculation of Pipeline Pressure Drop
HG/T 20570.8-95 Design of Gas liquid Separator
HG/T 20570.9-95 Calculation of Pressure Loss at Inlet and Outlet Pipe Orifices of Equipment
HG/T 20570.10-95 Professional Noise Control Design of Process System
HG/T 20570.11-95 Selection of heat insulation and heat preservation types
HG/T 20570.12-95 Flare System Equipment
HG/T 20570.13-95 Setting of Public Material Stations
HG/T 20570.14-95 Setting of Personal Protection Emergency System
HG/T 20570.15-95 Setting of Pipeline Flow Restriction Orifice
HG/T 20570.16-95 Setting of Gas Seal
HG/T 20570.17-95 Liquid Seal Setting
HG/T 20570.18-95 Valve Settings
HG/T 20570.19-95 Setting of Flame Arrestor
HG/T 20570.20-95 Setting of Static Mixer
HG/T 20570.21-95 Setting of steam trap
HG/T 20570.22-95 Setting of Pipeline Filter
HG/T 20570.23-95 Setting of Blind Plate
HG/T 20570.24-95 Setting of Current Detector
Part of the text:
1 Determination principle of equipment design pressure and temperature
1.0.1 Scope of responsibility
1. 0.1.1 The process system discipline is responsible for determining the design of vessels, towers and heat exchangers (hereinafter referred to as equipment or vessels)
Pressure.
1.0 - 1.2 When determining the design pressure of equipment by the process system discipline, it is necessary to
It is economical and reasonable.
1.0. 1.3 The process system discipline shall provide the following information:
The maximum pressure that can be reached and the additional conditions of the system that should be considered by the discipline (such as system pressure change, safety valve in the system
The influence of relative position in the system on the design pressure).
1. 0.1.4 The process system discipline shall cooperate with the chemical process and other relevant disciplines for the following special equipment
In specific cases, the design pressure shall be determined according to special requirements (this design pressure is relative to the design pressure determined according to Table 1.0.4
Higher):
(1) The discharge of highly toxic substances is subject to environmental restrictions or directly affects personal and environmental safety;
(2) In some occasions, such as asphalt, paraffin, benzene and other condensable materials or some slurries, when discharged
Solidification in the device and discharge system, as well as water or other materials, which may freeze during discharge, may block the discharge system
situation,
(3) Some valuable materials need to reduce emission loss;
(4) The working pressure may rise sharply due to chemical reaction or other reasons.
1. 0.1.5 When necessary, the process system discipline proposes equipment according to the working conditions provided by the chemical process discipline
Design pressure and design temperature of the element.
1.0. 1.6 The process system discipline is uncertain about the design temperature of the equipment, but it should be based on the number published by the chemical process discipline
According to, the normal or maximum (or minimum) operating temperature during normal operation shall be provided to the equipment specialty so that the equipment specialty can
Determine the equipment design temperature. If it is really necessary for the process system discipline to propose the equipment design temperature, the process system discipline can
Refer to 1.0.8 to determine the equipment design temperature.
1.0.2 Term description
1.0. 2.1 Pressure
Unless otherwise specified in this regulation, it refers to absolute pressure.
1.0. 2.2 Maximum working pressure
The maximum pressure that can be reached at the top of the container during normal operation, also called the maximum normal working pressure
power. This value is usually proposed by the chemical process discipline.
(1) Internal pressure vessel
It refers to the maximum pressure that may appear on the top of the container during normal operation.
(2) Vacuum vessel
It refers to the maximum vacuum degree that may occur on the top of the container during normal operation.
(3) External pressure vessel
It refers to the maximum internal and external pressure difference that may occur at the top of the container during normal operation.
1. 0.2.3 Maximum pressure
The base pressure used to determine the design pressure of the vessel. It is determined by the maximum working pressure of the vessel plus the process in the process
The pressure that can be reached at the top of the container after the additional conditions of the working system. This value is determined by the process system discipline.
1.0. 2.4 Design pressure
It refers to the set maximum pressure at the top of the vessel (including additional conditions of the process system), and the corresponding design temperature
As the condition of equipment design load proposed by the process system discipline to the equipment discipline, its value shall not be lower than the highest
Pressure. For equipment with special requirements (such as 1.0.1.4), the design pressure shall be determined by the process system discipline in conjunction with the chemical engineer
Art and other relevant disciplines shall mutually agree. In the system with safety relief device, the design pressure of special equipment is higher than that of fire control
The safety relief device is only used to protect equipment in case of fire.
1.0. 2.5 Pump closing pressure
It refers to the discharge pressure of the centrifugal pump when the outlet valve is closed and the corresponding flow is zero.
1.0. 2.6 Opening pressure of safety valve (i.e. set pressure of safety valve)
For the static pressure at the inlet of the safety valve at the moment when the safety valve disc starts to rise and the medium is discharged continuously, see Safety
Setting and Selection of Valves (HGJT 20570.2-95) 0
1.0. 2.7 Maximum (minimum) operating temperature
It refers to the highest (lowest) metal temperature of element metal that may occur during normal operation of the container.
1.0.3 Scope of application
1.0.3.1 This regulation is only applicable to the determination of the design pressure of pressure vessels within the following ranges:
(1) 0. 1MPa (gauge) cluster design pressure 35MPa (gauge);
(2) The vacuum degree is higher than 2kPa (200mm water column) (Table).
1.0.3.2 This regulation is only applicable to the determination of the design pressure of atmospheric vessels within the following ranges:
(1) The design pressure is lower than 0. IM Pa (table);
(2) The vacuum degree is lower than or equal to 2kPa (200mm water column) (Table).
1.0.4 Determination principle of equipment design pressure
1. 0.4.1 See 1.0.4 for washing principle of design pressure
Design Pressure Selection Table 1.0.4
The working design pressure under the design pressure is normal pressure, and it is generally 1.00 1.10 times of the maximum pressure (gauge) when the normal pressure is used plus the additional conditions of the system to check that no safety relief device is installed
The safety valve is installed with 1.05 1.10 times of the maximum working pressure (when the maximum working pressure is too high, the lower limit can be taken, otherwise the upper limit can be taken), and it is not lower than the opening pressure of the safety valve
The bursting disc installed shall not be less than the maximum calibrated bursting pressure (see Setting and Selection of bursting discs (HG/T 20570.3-95) for details)
The safety valve installed on the outlet pipeline is not lower than the opening pressure of the safety valve plus the pressure drop of the fluid from the container to the safety valve. The container is located at the inlet side of the pump, and if there is no safety relief device, take the design pressure when there is no safety relief device, and use 0 The IOMPa (gauge) external pressure check container is located at the pump outlet side, and when there is no safety relief device, the closing pressure of the pump is taken. The jacketed vacuum container is equipped with a safety relief device. The design external pressure is 1.25 times the maximum internal and external pressure difference or 0.1M Pa (gauge), and the smaller value is taken. No safety relief device is provided
Design according to full vacuum condition (i.e. design external pressure is taken as 0 The wall of the jacketed vacuum vessel with internal pressure in the jacket is designed as the external pressure vessel, and the design pressure is taken as the vacuum capacity without jacket
The pressure value specified by, plus the design pressure in the jacket, must
Check the stability under jacket test pressure (external pressure)
The design internal pressure of jacket wall shall be selected according to the regulations of internal pressure vessel
The design external pressure shall not be less than that which may occur during operation
The medium is liquid propane or saturated at 50 ℃
And vapor pressure greater than 1.57MPa (gauge), less than
At 1.6 2MPa (meter)
1.7 7MPa (Table)
The medium is liquid propylene or saturated at 50 ℃
And vapor pressure is greater than 1.6 2MPa (table), less than
1.9 At 4MPa (gauge)
2. 16MPa (gauge)
1. 0.4.2 The steam surface condenser under low pressure shall be designed under full vacuum condition.
1.0. 4.3 The storage pressure vessel containing liquefied petroleum gas with a volume greater than or equal to room
The designer and the process system designer negotiate to determine the design temperature, but not lower than 400C. According to the design temperature and
The corresponding saturated vapor pressure of the medium is used to determine the maximum working pressure and design pressure.
1. 0.4.4 In chemical production, when the same equipment needs to withstand a variety of different working conditions (for example, some reactors need to adapt to blowing
Changes of various working conditions in various chemical processes such as sweeping, pressure test, temperature rise reduction, chemical reaction, catalyst regeneration, etc.)
The design pressure of Class A equipment shall be determined according to 1.0.4 and 1.0.6, and each stage shall be explained to the equipment discipline
Corresponding change time and medium change of working pressure and temperature.
1.0.5 Selection of maximum pressure of equipment in various systems
1.5.5.1 Centrifugal pump system
(1) Maximum pressure of upstream equipment of the final shut-off valve at the pump output side
a. If the design pressure of the container on the suction side is selected according to Table 1.0.4, the maximum pressure of the equipment on the pump output side is equal to
The maximum pressure of the container on the suction side of the pump plus the closing differential pressure at the pump outlet plus (or minus) the static head.
b. If there are special requirements, the maximum pressure at the pump output side shall be jointly determined by the process system discipline and relevant disciplines
Agreed.
(2) The maximum pressure of the downstream equipment of the final shut-off valve at the pump output side should be the maximum pressure given by the chemical process discipline
The maximum pressure after working pressure and system additional conditions.
1.0.5.2 Positive displacement pump system
The output pressure of the pump is mainly limited by the strength of the pump housing and the torque of the driver. Therefore, for positive displacement pumps
Instead of the word "closing pressure", use "stop pressure" (even if the differential pressure required for stopping the drive machine).
The "stop pressure" is usually much higher than its normal working pressure, so the equipment on the output pipeline of the positive displacement pump
It shall not be designed as "stop pressure". The maximum pressure of the equipment on the output pipeline of the positive displacement pump is proposed by the chemical process specialty
Maximum working pressure of the equipment plus additional conditions of the system.
1.0.5.3 Refrigeration system
The chemical process specialty usually provides the maximum working pressure that the refrigeration system is expected to reach during operation. But in
After parking, the pressure at the high pressure side will decrease while the pressure at the low pressure side will increase until the pressure at both sides of the system is equal
That is "shutdown pressure".
The maximum working pressure at the high-pressure side is usually the value specified by the process, which is higher than the "shutdown pressure".
The maximum working pressure at the low-pressure side is "shutdown pressure" plus a certain margin, which depends on the system shutdown
Thermodynamic properties of heat input and refrigerant during the period. The maximum working pressure at the low-pressure side is the highest during long-term shutdown
The equilibrium pressure of the refrigerant at the expected ambient temperature, or refer to 1.0.5.6.
The "shutdown pressure" is calculated by throttling from the high-pressure side to the low-pressure side.
The maximum working pressure plus additional conditions of the system is the maximum pressure of the refrigeration system, which is divided into high pressure side and low pressure side
Don't be sure.
1.0. 5.4 Compressor system
The compressor system for processing steam and steam mixture and other multiple equipment in series shall be subject to the same overload
The maximum pressure of the equipment shall be selected from a group of equipment (between two shut-off valves) of the pressure source, and the following aspects shall be noted:
(1) Set the safety valve as close as possible to the normal temperature in the group;
(2) The maximum working pressure of the equipment immediately upstream of the safety valve is used to determine the maximum pressure of other equipment in the system
Benchmark;
(3) The opening pressure of the safety valve is equal to the design pressure of the upstream equipment minus the maximum normal flow of the equipment to the safety valve
Measure the pressure drop under.
L0. 5.5 Tower system
The tower system includes tower, reboiler, overhead condenser and reflux tank. The maximum pressure of the tower shall be in accordance with the
The maximum working pressure at the top of the tower specified by the Owner shall be determined by adding additional conditions of the system.
1.0.5.6 Container for liquefied gas
(1) When the pressure vessel containing liquefied gas with critical temperature higher than 50 ℃ is designed with reliable cold insulation device
The maximum pressure is the saturated vapor pressure of the contained liquefied gas at the highest possible working temperature; as
Without cold insulation facilities, the maximum pressure shall not be lower than the saturated vapor pressure of the liquefied gas at 50 ℃.
(2) When the pressure vessel containing liquefied gas with critical temperature lower than 50 ℃ is designed with reliable cold insulation device
If it can be stored at low temperature, the maximum pressure shall not be lower than the saturated steam pressure under the measured maximum temperature;
The maximum pressure of pressure vessels without measured data or cold insulation facilities shall not be lower than that of liquefied gas in the specification
The gas pressure at the temperature of 50 ℃ when the maximum filling amount is fixed.
(3) The design temperature of the pressure vessel containing mixed liquefied petroleum gas at normal temperature shall be 50 ℃. When its 50'C
When the saturated vapor pressure of 50 ℃ isobutane is lower than that of 50 ℃ isobutane, take the saturated vapor pressure of 50 ℃ isobutane
Is the maximum pressure; When it is higher than the saturated vapor pressure of 50 ℃ isobutane, take the saturated vapor pressure of 50 ℃ propane
Is the maximum pressure; If the saturated vapor pressure of propane is higher than 50 ℃, take the saturated vapor pressure of propylene at 50 ℃ as the maximum
High pressure.
1.0. 'Final determination principle of equipment design pressure
According to Table 1.0.4 Design Pressure Selection Table, the preliminary design pressure of each equipment is determined. preliminary
The determined design pressure shall also be determined according to the relative position between the equipment and the safety relief device in each safety system
The final design pressure of the equipment obtained through adjustment is the basis for equipment calculation of the equipment discipline
The adjustment principles are as follows:
1.0. 6.1 Design pressure of equipment with safety relief device and its upstream equipment (finally determined)
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