Standard for design base of steel chemical vessels
1 General provisions
1.0.1 This standard is developed in order to implement national laws and regulations in the design of steel chemical vessels, reasonably determine the design parameters of vessels, and ensure safety, applicability, economic rationality, advanced technology and quality.
1.0.2 This standard is applicable to the determination of design base of steel chemical vessels.
1.0.3 This standard is not applicable to the determination of design base of pressure vessel chamber in steel rotating or reciprocating chemical mechanical equipment.
1.0.4 In addition to those specified in this standard, the design base of steel chemical vessels shall also be determined in accordance with the requirements of the current relevant standards of the nation.
2 Terms and symbols
2.1 Terms
2.1.1
pressure vessel
closed vessel containing fluid medium under pressure
2.1.2
stationary pressure vessel
pressure vessel installed and used in a fixed location
2.1.3
vessel under internal pressure
vessel whose internal pressure is higher than the external pressure during normal operation
2.1.4
vessel under external pressure
vessel whose external pressure is higher than the internal pressure during normal operation
2.1.5
vacuum vessel
vessel with pressure (absolute pressure) of medium inside less than the ambient atmospheric pressure, namely that working in vacuum state, which is a special vessel under external pressure
2.1.6
atmospheric vessel
vessel directly exposed to ambient atmosphere or having working (gauge) pressure of zero
2.1.7
chamber
relatively independent closed space containing the medium in the vessel
2.1.8
part, component
basic unit parts of pressure vessel, such as shells, covers, flanges, pads and support rings of various shapes
2.1.9
pressure part
parts and components of vessel bearing the pressure load (including internal and external pressure)
2.1.10
non-pressure part
parts and components directly or indirectly connected with the vessel in order to meet the use requirements, without bearing pressure load (or bearing negligible pressure load)
2.1.11
pressure
force acting perpendicularly on the unit area of an object, namely the pressure in physics; it refers to gauge pressure herein, unless otherwise indicated
2.1.12
absolute pressure
pressure measured based on zero pressure in absolute vacuum state, which is expressed by adding the letter “A” or “a” following the pressure unit
2.1.13
gauge pressure
difference between the internal pressure of the vessel and the ambient atmospheric pressure, which is expressed by adding the letter “G” or “g” following the pressure unit. In the documents on pressure vessel design, unless otherwise specified, the pressure involved refers to the gauge pressure
2.1.14
operating pressure, working pressure
maximum possible pressure on the top of vessel under normal working condition
2.1.15
design pressure
preset maximum pressure on the vessel top, which shall be taken as the basic design load condition together with the corresponding design temperature; it shall not be less than the working pressure
2.1.16
calculation pressure
pressure used to determine the part thickness at the corresponding design temperature, including additional loads such as the static pressure of liquid column
2.1.17
maximum allowable working pressure (MAWP)
maximum allowable working pressure on the vessel top at corresponding specific temperature, which is calculated according to the effective thickness of each pressure part of the vessel and by taking into account all the loads borne by the part, and the minimum value is taken
Contents
Foreword i
1 General provisions
2 Terms and symbols
2.1 Terms
2.2 Symbols
3 Basic requirements
4 Design pressure
5 Design temperature
6 Design loads
7 Addition to thickness
7.1 Determination of addition to thickness
7.2 Negative deviation of thickness for steel material
7.3 Corrosion allowance
8 Design working life
9 Minimum thickness
10 Allowable stresses
Annex A (Informative) Common failure modes of pressure vessels
Annex B (Informative) Control values of top deflection
Annex C (Normative) Saturated vapor pressure and boiling point under atmospheric pressure of several common media
Annex D (Informative) Load estimation table of steel platform, straight ladder and tray
Annex E (Informative) Piling density of common packings
Annex F (Normative) Negative deviation of thickness for common steel materials
Annex G (Informative) High temperature oxidation rate of metallic materials
Explanation of wording in this standard
List of quoted standards
Standard for design base of steel chemical vessels
1 General provisions
1.0.1 This standard is developed in order to implement national laws and regulations in the design of steel chemical vessels, reasonably determine the design parameters of vessels, and ensure safety, applicability, economic rationality, advanced technology and quality.
1.0.2 This standard is applicable to the determination of design base of steel chemical vessels.
1.0.3 This standard is not applicable to the determination of design base of pressure vessel chamber in steel rotating or reciprocating chemical mechanical equipment.
1.0.4 In addition to those specified in this standard, the design base of steel chemical vessels shall also be determined in accordance with the requirements of the current relevant standards of the nation.
2 Terms and symbols
2.1 Terms
2.1.1
pressure vessel
closed vessel containing fluid medium under pressure
2.1.2
stationary pressure vessel
pressure vessel installed and used in a fixed location
2.1.3
vessel under internal pressure
vessel whose internal pressure is higher than the external pressure during normal operation
2.1.4
vessel under external pressure
vessel whose external pressure is higher than the internal pressure during normal operation
2.1.5
vacuum vessel
vessel with pressure (absolute pressure) of medium inside less than the ambient atmospheric pressure, namely that working in vacuum state, which is a special vessel under external pressure
2.1.6
atmospheric vessel
vessel directly exposed to ambient atmosphere or having working (gauge) pressure of zero
2.1.7
chamber
relatively independent closed space containing the medium in the vessel
2.1.8
part, component
basic unit parts of pressure vessel, such as shells, covers, flanges, pads and support rings of various shapes
2.1.9
pressure part
parts and components of vessel bearing the pressure load (including internal and external pressure)
2.1.10
non-pressure part
parts and components directly or indirectly connected with the vessel in order to meet the use requirements, without bearing pressure load (or bearing negligible pressure load)
2.1.11
pressure
force acting perpendicularly on the unit area of an object, namely the pressure in physics; it refers to gauge pressure herein, unless otherwise indicated
2.1.12
absolute pressure
pressure measured based on zero pressure in absolute vacuum state, which is expressed by adding the letter “A” or “a” following the pressure unit
2.1.13
gauge pressure
difference between the internal pressure of the vessel and the ambient atmospheric pressure, which is expressed by adding the letter “G” or “g” following the pressure unit. In the documents on pressure vessel design, unless otherwise specified, the pressure involved refers to the gauge pressure
2.1.14
operating pressure, working pressure
maximum possible pressure on the top of vessel under normal working condition
2.1.15
design pressure
preset maximum pressure on the vessel top, which shall be taken as the basic design load condition together with the corresponding design temperature; it shall not be less than the working pressure
2.1.16
calculation pressure
pressure used to determine the part thickness at the corresponding design temperature, including additional loads such as the static pressure of liquid column
2.1.17
maximum allowable working pressure (MAWP)
maximum allowable working pressure on the vessel top at corresponding specific temperature, which is calculated according to the effective thickness of each pressure part of the vessel and by taking into account all the loads borne by the part, and the minimum value is taken
Contents of HG/T 20580-2020
Contents
Foreword i
1 General provisions
2 Terms and symbols
2.1 Terms
2.2 Symbols
3 Basic requirements
4 Design pressure
5 Design temperature
6 Design loads
7 Addition to thickness
7.1 Determination of addition to thickness
7.2 Negative deviation of thickness for steel material
7.3 Corrosion allowance
8 Design working life
9 Minimum thickness
10 Allowable stresses
Annex A (Informative) Common failure modes of pressure vessels
Annex B (Informative) Control values of top deflection
Annex C (Normative) Saturated vapor pressure and boiling point under atmospheric pressure of several common media
Annex D (Informative) Load estimation table of steel platform, straight ladder and tray
Annex E (Informative) Piling density of common packings
Annex F (Normative) Negative deviation of thickness for common steel materials
Annex G (Informative) High temperature oxidation rate of metallic materials
Explanation of wording in this standard
List of quoted standards
