HG 20580-1998 Basic regulations for the design of steel chemical vessels
Some standard content:
Industry Standard of the People's Republic of China
HG20580-1998
Specification for Design Base of Steel Chemical Vessels1998-11-18Published
State Administration of Petroleum and Chemical Industry
1999—03—01
Industry Standard of the People's Republic of China
Specification for Design Base of Steel Chemical Vessels VesselsHG20580-1998
Editor: Lanzhou Design Institute of Sinopec GroupApproval Department: State Bureau of Petroleum and Chemical IndustryImplementation Date: March 1, 1999National Chemical Engineering Construction Standard Editing Center (formerly Chemical Engineering Construction Standard Editing Center) 1999 Beijing
This standard (HG20580-1998) is based on the original standard (HGJ14-89), based on the experience gained from many years of implementation, and based on the content of national standard GB150-1998 and the standard specifications of domestic and foreign engineering companies in recent years. The new revised standard has the following major changes compared with the original standard:
1. Adjusted and supplemented the "definition" content and corresponding clauses; 2. Supplemented the content of the "design pressure" and "design temperature" clauses; 3. Revised and supplemented the relevant provisions of "design load". The appendix to this standard is a suggestive appendix.
This standard is proposed and managed by the National Chemical Equipment Design Technology Center. This standard is edited by Lanzhou Design Institute of Sinopec Group. The main drafters of this standard are Huang Shijin and Guo Yide. 1. The scope of application of this regulation is the same as GB150 "Steel Pressure Vessel". 2. Reference standards: National Quality and Technical Supervision Bureau Boiler and Pressure Vessel Safety Supervision Bureau "Pressure Vessel Safety Technical Supervision Regulations" GB150
JB4710
"Steel Pressure Vessel"
"Shell and Tube Heat Exchanger"
"Steel Tower Vessel"
Except where otherwise specified, pressures are gauge pressures. 3.1.1 Working pressure
1 Internal pressure vessel
3.1 Pressure
The highest pressure that may occur at the top of the vessel under normal working conditions. 2 Vacuum vessel
The maximum vacuum degree that may occur at the top of the vessel under normal working conditions. 3 External pressure vessel
The maximum internal and external pressure difference that may occur at the vessel under normal working conditions. 3.1.2 Design pressure
The maximum pressure at the top of the vessel set, together with the corresponding design temperature as the condition for the design load, its value shall not be lower than the working pressure.
3.1.3 Calculation pressure
The pressure used to determine the thickness of each part of the shell at the corresponding design temperature, including the static pressure of the liquid column. When the static pressure of the liquid column borne by each part or component of the shell is less than 5% of the design pressure, it can be ignored. 3.1.4 Maximum allowable working pressure
The maximum working pressure allowed at the top of the pressure vessel after installation at the specified temperature. This pressure should be the minimum value of the maximum allowable working pressure (and the corresponding static pressure of the liquid column of the component) calculated by deducting the thickness required for other loads other than pressure from the effective thickness of each pressure component of the vessel.
The maximum allowable working pressure can be used as the basis for determining the operating pressure of the safety relief device protecting the container (the opening pressure of the safety valve or the designed bursting pressure of the bursting disc).
1 When the pressure vessel has different design temperatures according to the use conditions, the maximum allowable working pressure corresponding to each design temperature should be calculated separately.
2 When the maximum allowable working pressure cannot be determined by calculation, the design pressure can be used instead of the maximum allowable working pressure. 3.1.5 Opening pressure of safety valve
The pressure measured at the inlet of the safety valve when the valve disc of the safety valve begins to leave the valve seat and the medium is in a continuous discharge state. 3.1.6 Rated bursting pressure of bursting disc
The bursting pressure marked on the nameplate of the bursting disc. 3.2 Temperature
3.2.1 Metal temperature
The average temperature of the container element along the cross-sectional thickness. 3.2.2 Working temperature
The medium temperature of the container under normal working conditions. 3.2.3 Maximum operating temperature
The maximum temperature of the medium that may occur in the container under normal working conditions. 3.2.4 Minimum operating temperature
The minimum temperature of the medium that may occur in the container under normal working conditions. 3.2.5 Design temperature
The metal temperature of the components set under the corresponding design pressure under normal working conditions of the container. The design temperature of the container refers to the metal temperature of the shell. 3.2.6 Ambient temperature
In the design of pressure vessels, the definitions of ambient temperature involved are mainly the following: 1 Extreme temperature
The highest (lowest) temperature over the years.
2 Daily average maximum (lowest) temperature.
The highest (lowest) value of the daily average temperature over the years. 3 Winter air conditioning outdoor calculated temperature
The average daily average temperature of one day is not guaranteed every year over the years. April average minimum temperature
The temperature value obtained by adding the minimum temperatures of each day in the month and dividing it by the number of days in the month. 3.3 Thickness
3.3.1 Minimum thickness
The minimum thickness of the vessel shell after processing and forming, excluding the corrosion allowance. 3.3.2 Calculated thickness
The thickness of the pressure-bearing component of the vessel, excluding the thickness addition, calculated according to the corresponding formula to meet the strength and stability requirements. 3.3.3 Thickness addition
The additional thickness that must be considered when designing the pressure-bearing components of the vessel, including the negative deviation of the steel plate (or steel pipe) thickness and the corrosion allowance. 3.3.4 Design thickness
The sum of the calculated thickness and the corrosion allowance.
3.3.5 Nominal thickness (i.e. drawing thickness)
1 The design thickness plus the negative deviation of the steel thickness is rounded up to the thickness of the standard specification of the steel (steel plate or steel pipe). 2 For the thickness interval of steel plates, for cold-rolled steel plates, see GB708 "Dimensions, Shapes, Weights and Permissible Deviations of Cold-rolled Steel Plates and Steel Strips"; for hot-rolled steel plates, see GB709 "Dimensions, Shapes, Weights and Permissible Deviations of Hot-rolled Steel Plates and Steel Strips". 3 For commonly used steel plate thickness specifications, see HG20581 "Provisions for the Selection of Materials for Steel Chemical Containers". 3.3.6 Effective thickness
Nominal thickness minus thickness addition (the sum of corrosion allowance and negative deviation of steel thickness). 3.3.7 Relationship between various thicknesses
The relationship between various thicknesses is as follows:
Negative thickness deviation
Corrosion allowance
Calculated thickness. bZxz.net
Thickness rounding value 4
Thickness addition C
Note: This thickness relationship diagram does not include the following: ① The processing thinning amount considered by the manufacturer,
② The thickness second manufacturing rounding value;
③ Rough thickness, the minimum thickness of the head to be guaranteed, etc. Design thickness product
Effective thickness.
Nominal thickness
4 Determination of design pressure
4.0.1 When designing a container, various working conditions in the combination of the working pressure and the corresponding working temperature that may be encountered under working conditions must be considered, and the design pressure shall be determined based on the working pressure under the most demanding working conditions. 4.0.2 Determination of preliminary design pressure
The preliminary design pressure of a single container can be determined according to Table 4-1. 4.0.3 Determine the final design pressure
According to the relative position of the container in each safety system and the safety relief device, adjust the preliminary design pressure determined in 4.0.2 to obtain the final design pressure of a single container. The adjustment principle is detailed in 1.0.The provisions of Article 6. Table 4-1 Design pressure selection table
No safety relief device
Equipped with safety valve
Equipped with bursting disc
Safety valve installed on the outlet pipeline
When the container is located at the pump inlet side and there is no safety relief pressure
Device
When the container is located at the pump outlet and there is no safety release
Device
When the container is located at the compressor inlet side and there is no safety relief device
When the container is located at the compressor outlet side and there is no safety relief device
No jacket
Vacuum container
With
Internal pressure in the jacket
Jacket vacuum
With
Vacuum in the jacket
Internal pressure in the jacket
With safety relief device
Without safety relief device||t t||Container (vacuum)
Jacket (internal pressure)
Container (internal pressure)
Jacket (vacuum)
Design pressure
1.0~1.10 times of working pressure
Not less than (equal to or slightly greater than) the opening pressure of the safety valve (the opening pressure of the safety valve is 1.05~1.10 times of the working pressure)
Take the design bursting pressure of the bursting disc plus the upper limit of the manufacturing range not less than the opening pressure of the safety valve plus the pressure drop of the fluid flowing from the container to the safety valve. Take the design pressure when there is no safety relief device, and check with an external pressure of 0.1MPa to take the larger value of the following three:
(1) The normal inlet pressure of the pump plus 1.2 times the normal working head of the pump: (2) The maximum inlet pressure of the pump plus the normal working head of the pump; (3) The normal inlet pressure of the pump plus the closing head (i.e. the full outlet pressure of the pump). Lift when closed) Take the design pressure when there is no safety relief device, and check with 0.1MPa external pressure Take the compressor outlet pressure
Design external pressure Take 1.25 times the maximum internal and external pressure difference or 0.1MPa, whichever is smaller Design external pressure Take 0.1MPa
Design external pressure is selected according to the provisions of unjacketed vacuum vessels ① Design internal pressure is selected according to the provisions of internal pressure vessels Design internal pressure is selected according to the provisions of internal pressure vessels Design external pressure is selected according to the provisions of unjacketed vacuum vessels
Within the specified filling
coefficient range, containers containing liquefied
petroleum gas or mixed
liquefied petroleum gas
(referring to a mixture of propylene and propane
or propylene, propane and
butene, etc.) at normal
temperature?@?
When the saturated vapor pressure of the medium at 50℃ is lower than the saturated vapor pressure of isobutane at 50℃ (such as butane, butene, butadiene); When the saturated vapor pressure of the medium at 50℃ is higher than the saturated vapor pressure of isobutane at 50℃ (such as liquid propane); When the saturated vapor pressure of the medium at 50℃ is higher than the saturated vapor pressure of propane at 50℃ (such as liquid propylene); Pressure vessel components under pressure on both sides Continued 4-1 Design pressure The design external pressure shall not be less than the maximum internal and external pressure difference that may occur under normal working conditions. Generally, the design pressures on both sides should be used as the design pressures of the component respectively. When there are reliable measures to ensure that both sides are pressurized at the same time, the maximum pressure difference on both sides can be taken as the design pressure. Note: ① The calculated external pressure of the container should be the design external pressure plus the design internal pressure in the jacket, and the stability under the jacket test pressure (external pressure) must be checked.
② The calculated internal pressure of the container should be the design internal pressure plus 0.1MPa, and the stability under the jacket test pressure (external pressure) must be checked. ③ For pressure vessels containing liquefied petroleum gas, if the design unit can provide a reliable design temperature based on the highest temperature conditions (not extreme temperature values) in the installation area, the working pressure and design pressure can be determined according to the saturated vapor pressure of the medium at the design temperature, but it must be approved in advance by the chief technical person in charge of the design unit and submitted to the provincial competent department and the boiler pressure vessel safety supervision agency of the labor department at the same level for filing. ④ For storage pressure vessels containing liquefied petroleum gas with a volume greater than or equal to 100m, the design temperature (but not less than 40℃) can be determined by the design, and the design pressure can be determined according to the saturated vapor pressure of the medium corresponding to the design temperature. ③ The specified filling coefficient is generally taken as 0.9. The volume can be greater than 0.9 after actual measurement, but shall not be greater than 0.95. 4.0.4 When a closed thin-walled container is affected by the ambient temperature during transportation or storage and may cause negative pressure, it should be calibrated with an external pressure of 0.0175MPa.
4.0.5 When the national pressure vessel safety supervision department or engineering design has special provisions on the design pressure of the container, its design pressure shall be determined in accordance with relevant regulations.
5 Determination of design temperature
5.0.1 When the metal temperature cannot be determined through heat transfer calculations or actual measurement results, the design temperature shall be selected according to the following provisions: 1 When the container wall is in direct contact with the medium and there is external insulation (or cooling), the design temperature shall be determined according to 1 or 1 in Table 5-1. Table 5-1
Medium working temperature
T<-20℃
20℃T15℃
T>15℃
Design temperature selection table
Medium minimum working temperature
Medium minimum working humidity
Medium maximum working temperature
Note: When the maximum (lowest) working temperature is unclear, it shall be determined according to 1 in the table. Calculation
Medium working temperature minus 0~10℃
Medium working temperature minus 5~10℃
Medium working temperature plus 15~30℃
2 When the medium in the container is directly heated by steam or indirectly heated by built-in heating elements (such as heating coils, electric heating elements, etc.), the design temperature shall be the maximum working temperature.
3 When the two sides of the container wall are in direct contact with media of different temperatures and a single medium may be in contact, the design temperature shall be determined based on the working temperature of the higher side. When the temperature of any medium is lower than -20°C, the minimum design temperature shall be determined based on the working temperature of that side.
4 For containers installed outdoors without insulation, when the minimum design temperature is controlled by the regional ambient temperature, it can be selected according to the following provisions: (1) For storage tanks containing compressed gas, the minimum design temperature shall be the ambient temperature minus 3°C; (2) For storage tanks containing liquid that accounts for more than 1/4 of the container volume, the minimum design temperature shall be the ambient temperature. Note: The ambient temperature here is the lowest value of the "average monthly minimum temperature" in the container installation area over the years, and its value shall be provided by the local (device location) meteorological department. Appendix A of this regulation gives the reference values of the "average monthly minimum temperature" in major regions of my country. 5 For outdoor steel structures such as skirts, the ambient temperature shall be used as the design temperature. Note: The ambient temperature here is "winter air conditioning outdoor calculation temperature". For details, please refer to HG20652-1998 Tower Design Technical Regulations". 5.0.2 In the following cases, the metal temperature of the container should be obtained by heat transfer calculation as the design temperature of the container: 1 The inner wall of the container has a reliable insulation layer;
2 When the two sides of the container wall are in direct contact with media of different temperatures and no single medium is in contact. 5.0.3 When different parts of the container may have different temperatures under working conditions, the corresponding design temperature of the components should be selected according to the different temperatures.
5.0.4 The highest (or lowest) working temperature of the container When the operating temperature is close to the allowable use temperature limit of the selected material, the design temperature should be carefully selected in combination with the specific situation to avoid increasing investment or reducing safety. 5.0.5 When there are special requirements for the design temperature of the container in the engineering design, its design temperature should be determined in accordance with relevant regulations. 8
6.1.1 Pressure:
Internal pressure, external pressure or maximum pressure difference;
Design load
6.1 Loads to be considered in container design
2 Static pressure of liquid column (when the static pressure of liquid column is less than 5% of the design pressure, it can be ignored); 3 Test pressure.
6.1.2 Gravity load:
Empty weight of container: the weight of the container shell and fixed accessories (such as connecting pipes, manholes, flanges, support rings and supports, etc.); 1
2 Gravity load of removable internal parts: the weight of removable components inside the container (such as packing, filter screens, demisters, catalysts and removable trays, etc.);
3 Gravity load of medium: the maximum weight of the medium in the container under normal working conditions. For solid materials, it should be calculated according to the actual bulk density of the material. 4 Gravity load of insulation materials: such as the weight of the insulation (or cold insulation) layer and its supporting parts, internal insulation materials, etc.: 5 Gravity load of accessories, the weight of accessories such as platforms, escalators, process piping and pipe racks directly connected to the container; The gravity load of steel platforms, escalators and trays should be calculated based on specific engineering design data. When there is no exact data, it can be estimated according to Table 6-1.
Table 6-1 Estimation of force loads for steel escalators, platforms and tower trays Name
Per square meter (or per meter)
Gravity load
Per square meter (or per meter)
Gravity load
Cage escalator
Tongue-shaped tower tray
(N/m2)
6Gravity load of water in the container during water pressure test, open escalator
145~235
Sieve plate tower tray
(N/m2)
Steel platform
Floating valve tower tray
(N/m*)
7Gravity load of maintenance personnel, maintenance tools and spare parts during maintenance. If there is no exact data, 690~790N/m2 can be used. 6.1.3 Wind load and seismic load
Circular bubble cap tray
(N/m*)
Tray filling liquid
(N/m*)
Strip bubble cap tray
1 Wind load and seismic load should be calculated according to the special provisions of the corresponding standards based on the container type (such as tower, spherical container, etc.). When there are no special provisions, GBJ9 "Building Structure Load Code" and SH3048 "Petrochemical Steel Equipment Seismic Design Code 9
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