Regulations for Safety Technical Supervision of Fixed Pressure Vessels
Promulgated by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
August 31, 2009
Table of Contents
1 General Principles... .............................. .............................. ........................(1)
2 Material... .............................. .............................. ........................(4)
3 Design... .............................. .............................. ........................(9)
4 Manufacturing... .............................. .............................. .....................(17)
5 Installation, Remodeling & Repair... .............................. ... ..................... ...(30)
6 Utilization Management ... ......... ... ......... ... ......... ......... ..................... .....................(31)
7 Periodic Inspection ... .............................. .............................. ..................(34)
8 Safety accessories ...... .............................. .............................. ...............(37)
9 Bylaws ......... .............................. .............................. ...............(40)
Annex A Classification of Pressure Vessel Categories and Pressure Ratings and Varieties ...... .............................. ......... (41)
Annex B Certificate of Conformity for Pressure Vessel Products... ......... ... ... ............ (44)
Annex C Pressure Vessel Product Nameplate ......... .............................. .............................. (45)
Annex D Special equipment code numbering method ........................ .............................. ............(48)
Fixed Pressure Vessel Safety Technology Supervision Regulations
1 General Principles
1.1 Purpose
In order to ensure the safe operation of the fixed pressure vessel, to protect the people's lives and property safety, and to promote the national economy, to ensure the safety of pressure vessels, to protect the people's lives and property safety, and to promote the national economy, to ensure the safe operation of pressure vessels. and property safety, and promote the development of the national economy, according to the "Regulations on the Safety Supervision of Special Equipment", the formulation of this procedure.
1.2 Fixed pressure vessel
Fixed pressure vessel is installed in a fixed position to use the pressure vessel (hereinafter referred to as pressure vessel, Note 1-1).
Note 1-1: Pressure vessels that are moved and used only within the installation or site for a specific purpose, as well as storage tanks for mobile air compressors, are supervised and managed as stationary pressure vessels.
1.3 Scope of application
This regulation applies to pressure vessels with the following conditions:
(1) the maximum working pressure is greater than or equal to 0.1MPa; (Note 1-2)
(2) the product of the working pressure and volume is greater than or equal to 2.5MPa?L; (Note 1-3)
(3) the medium is gases, liquefied gases and liquefied gases. The medium is gas, liquefied gas and liquid whose maximum working temperature is higher than or equal to its standard boiling point. (Note 1-4)
Of these, ultra-high-pressure vessels should be consistent with the "ultra-high-pressure vessel safety and technical supervision regulations"; non-metallic pressure vessels should be consistent with the "non-metallic pressure vessel safety and technical supervision regulations"; simple pressure vessels should be consistent with the "simple pressure vessel safety and technical supervision regulations".
Note 1-2: working pressure, refers to the pressure vessel in normal operation, the top of the highest possible pressure (gauge pressure).
Note 1-3: volume, is the geometric volume of the pressure vessel, i.e., from the design drawings marked dimensions calculated (without regard to manufacturing tolerances) and rounded. Generally, the volume of the internal parts permanently attached to the inside of the pressure vessel should be deducted.
Note 1-4: container medium for the maximum operating temperature below its standard boiling point of the liquid, if the volume of the gas phase space and the product of the working pressure is greater than or equal to 2.5MPa?L, also belongs to the scope of application of this regulation.
1.4 Special provisions of the scope of application
Pressure vessels should be referred to the use of pressure vessels using the management of the relevant provisions of this regulation, is responsible for the safety management of the pressure vessel within the scope of this article.
1.4.1 Only need to meet the general provisions of this regulation, design, manufacturing requirements of the pressure vessel
The scope of application of this regulation, the volume is greater than or equal to 25L of the following pressure vessels, only need to meet the relevant provisions of Chapter 1, 3, 4 of the regulation:
(1) "simple pressure vessel safety and technical supervision regulations" does not apply to the mobile air compressors of the Gas storage tanks;
(2) non-independent pressure vessel in the deep cooling device, direct-fired absorption refrigeration device pressure vessel, aluminum plate-fin heat exchanger, pressure vessel in the cold box in the air separation device;
(3) casing without shell casing heat exchanger, helical plate heat exchanger, brazed plate heat exchanger;
(4) hydropower automatic replenishment of pneumatic pressure water supply ( Towerless water) device in the pneumatic tank, fire fighting equipment in the gas or pneumatic water supply (foam) pressure tank;
(5) water treatment equipment in the ion exchange or filtration pressure vessels, hot water boilers with expansion tank;
(6) power industry special closed combination of electrical appliances (such as capacitance pressure vessel);
(7) rubber industry, the use of tire Vulcanizing machines and rubber molds under pressure;
(8) Accumulators attached to machinery and equipment.
1.4.2 Pressure vessels that are required to meet only the general provisions of this regulation, design and manufacturing permits
Pressure vessels with a volume greater than 1L and less than 25L, or with an internal diameter (for non-circular cross-section, refers to the maximum geometric dimensions of the internal boundaries of the cross-section, e.g., rectangle for the diagonal, ellipse for the long-axis) of less than 150mm are required to meet only the provisions of the general provisions of this regulation and sections 3.1, 4.1 .1 of the provisions of the design and manufacture in accordance with the requirements of the corresponding product standards.
1.4.3 only need to meet the general principles and manufacturing license requirements of the pressure vessel
The volume is less than or equal to 1L pressure vessel, only need to meet the general principles of this regulation and the provisions of 4.1.1, the design and manufacture of its requirements in accordance with the corresponding product standards.
1.5 Scope of inapplicability
This regulation does not apply to the following pressure vessels:
(1) mobile pressure vessels, cylinders, oxygen tanks;
(2) boiler safety and technical supervision regulations within the scope of application of waste heat boilers;
(3) normal operation of the highest working pressure of less than 0.1MPa container (including in the feed or discharge) (including in the process of feeding or discharging the need to instantaneously withstand pressure greater than or equal to 0.1MPa container);
(4) rotating or reciprocating movement of mechanical equipment in the self-contained or as a part of the pressurized chamber (such as pump casing, compressor casing, turbine casing, hydraulic cylinders, etc.);
(5) removable gasket-type plate heat exchanger (including half-welded plate heat exchanger), air cooling type heat exchanger, cooling drain.
1.6 Definition of the scope of the pressure vessel
The scope of the pressure vessel to which this regulation applies includes the pressure vessel body and safety accessories.
1.6.1 Pressure vessel body
The body of the pressure vessel is defined in the following scope:
(1) The bevel surface of the first circumferential welded joint of the pressure vessel welded to the external pipeline or device, the end surface of the first threaded joint of the threaded joint, the first sealing surface of the flange for flange connection, and the first sealing surface of the special connector or fittings for the connection;
(2) Pressure vessel open portion of the pressure bearing cover and its fasteners;
(3) Non-pressure elements and pressure vessel connection welds.
The main pressurized components of the pressure vessel body, including the shell, head (end cap), expansion joints, equipment flange; spherical shell plate of the ball tank; heat exchanger tube plate and heat exchanger tube; M36 or more (including M36) of the main stud of the equipment as well as the nominal diameter of more than or equal to 250mm of the receiver and pipe flange.
1.6.2 Safety accessories
Safety accessories for pressure vessels, including safety valves, rupture disc devices, emergency shut-off devices, safety interlocking devices, pressure gauges, liquid level gauges, temperature measuring instruments, etc., which are directly connected to the pressure vessel
1.7 Classes of Pressure Vessels
Based on the degree of danger, pressure vessels within the scope of application of these regulations are divided into Three categories, in order to facilitate the classification of supervision and management, the classification of pressure vessels is shown in Annex A.
1.8 Relationship with technical standards, management system
This regulation stipulates the basic safety requirements of the pressure vessel, the technical standards of the pressure vessel, management system, etc., shall not be lower than the requirements of this regulation
1.9 Non-compliance with the special handling of the regulations Provisions
The use of new materials, new technologies, new technologies and special requirements for the use of pressure vessels, does not meet the requirements of this regulation, the relevant units should be related to the design, research, testing and other bases, data, results and their inspection and testing reports and other technical information reported to the General Administration of Quality Supervision, Inspection and Quarantine (hereinafter referred to as the State Administration of Quality Supervision, Inspection and Quarantine), the State Administration of Quality Supervision, Inspection and Quarantine commissioned by the technical organization or the technical agency for technical review. Technical organizations commissioned by the AQSIQ for technical review. The results of the technical review approved by the AQSIQ, the use of new materials, new technologies, new techniques for pressure vessels before trial production, trial.
1.10 References to standards
The main references to standards (hereinafter referred to as the references to standards, Notes 1-5) are as follows:
(1) GB150 "steel pressure vessels"
(2) GB151 "shell and tube heat exchanger"
(3) GB12337 "steel spherical tanks"
(4) JB/T 4710 "Steel Tower Vessel"
(5) JB/T 4731 "Steel Horizontal Vessel"
(6) JB 4732 "Steel Pressure Vessel - Analysis and Design Criteria"
(7) JB/T 4734 "Aluminum Welded Vessel"
(8) JB/T 4745 "Titanium Welded Vessels"
(9) JB/T 4755 "Copper Pressure Vessels"
(10) JB/T 4756 "Pressure Vessels Made of Nickel and Nickel Alloys"
Note 1-5: In the cited standards of these regulations, where the year number is indicated, all of the subsequent change orders (excluding errata) or revisions do not apply to these regulations; where no year is indicated, the latest version applies to these regulations.
1.11 Supervision
(1) pressure vessel design, manufacture (including on-site welding, the same below), installation, transformation, maintenance, use, inspection and testing, should be strictly enforced in accordance with the provisions of this regulation;
(2) pressure vessel design, manufacture, installation, transformation, maintenance, use of units and inspection and testing organizations should be in accordance with the relevant provisions of the special equipment information management. Information management of the relevant provisions of the required data in a timely manner into the information management system for special equipment;
(3) AQSIQ and local quality and technical supervision departments are responsible for the pressure vessel safety supervision, supervision of the implementation of these regulations.
2 materials
2.1 General requirements
(1) the selection of pressure vessels should take into account the mechanical properties of the material, chemical properties, physical properties and process performance;
(2) the quality of materials used in the pressure vessel, specifications and markings, should be in line with the corresponding national standards of the material or the provisions of the industry standards, the use of its requirements should be in line with the provisions of the standards cited in this regulation. The provisions of the standards cited in this regulation
(3) pressure vessel special steel plate (strip) manufacturing unit should obtain the appropriate special equipment manufacturing license;
(4) material manufacturing unit should be made in the material of the obvious parts of the clear, solid steel mark or other methods of marking, the implementation of the implementation of the manufacturing license of special materials for pressure vessels, the quality certificate and the material on the logo content should also include the manufacturing license logo. Sign content should also include the manufacturing license mark and license number;
(5) material manufacturing unit should provide quality certificates to the material unit, material quality certificate should be complete, clear, and stamped with the material manufacturing unit quality inspection chapter;
(6) for pressure vessels, steel plate, by the material manufacturing unit directly to the pressure vessel manufacturing unit supply When the two sides agreed on the number of copies of the steel plate quality instructions; by the non-material unit supply, the material manufacturing unit should be issued for each steel plate quality certificate;
(7) pressure vessel manufacturing unit from the non-material production unit to obtain materials for pressure vessels, should be obtained at the same time as the original certificate of quality of the material or stamped with the official seal of the material supply unit inspection and a copy of the operator's seal (pressure vessel) (Except for special steel plate); pressure vessel manufacturing unit should be obtained from the pressure vessel materials and material quality certificate of authenticity and consistency is responsible.
2.2 melting method
Pressure vessel pressure element steel, should be oxygen converter or electric furnace smelting sedentary steel. For the standard tensile strength lower limit value greater than or equal to 540MPa low alloy steel plate and austenitic - ferritic stainless steel plate, as well as for the design temperature is lower than -20 ℃ low-temperature steel plate and low-temperature steel forgings, should also be used outside the furnace refining process.
2.3 Chemical Composition (melting analysis)
2.3.1 Carbon steel and low alloy steel used for welding
Carbon steel and low alloy steel steel, C ≤ 0.25%, P ≤ 0.035%, S ≤ 0.035%.
2.3.2 Carbon steel and low alloy steel in special steel for pressure vessels
Carbon steel and low alloy steel steel in special steel for pressure vessels (steel plates, tubes and steel forgings), the phosphorus and sulfur content should meet the following requirements:
(1) carbon steel and low alloy steel steel basic requirements, P ≤ 0.030%, S ≤ 0.020%;
(2) Standard tensile strength, P ≤ 0.035%, S ≤ 0.035%. p>(2) standard tensile strength lower limit value greater than or equal to 540MPa steel, P ≤ 0.025%, S ≤ 0.015%;
(3) for the design of the temperature is lower than -20 ° C and the lower limit value of standard tensile strength less than 540MPa steel, P ≤ 0.025%, S ≤ 0.012%.
(4) for the design temperature is lower than -20 ℃ and the lower limit value of standard tensile strength is greater than or equal to 540MPa steel, P ≤ 0.020%, S ≤ 0.010%.
2.4 Mechanical Properties
2.4.1 Impact
Thickness not less than 6mm steel plate, diameter and thickness can be prepared for the width of 5mm small size impact specimen of steel pipe, any size of steel forgings, in accordance with the design requirements of the impact test temperature of the impact of the V-notch specimen impact function (KV2) indicators should be consistent with the provisions of Table 2-1.
Table 2-1 carbon steel and low alloy steel (plate, tube and steel forgings) impact work (Note 2-1)
Steel standard tensile strength of the lower limit Rm (MPa) 3 standard specimen impact work average KV2 (J)
≤450 ≥ 20
＞450 ~ 510 ≥ 24
＞510 ~ 570 ≥ 31
＞570～630 ≥34
＞630～690 ≥38
Note 2-1: (1) Specimen sampling parts and methods should be in accordance with the provisions of the corresponding steel standards;
(2) Impact test each group of three standard specimens (width of 10mm), allowing one specimen of the impact work value is lower than the tabular value, but not less than 70% of the tabular value. Shall not be less than 70% of the tabulated values;
(3) When the size of the steel can not prepare the standard specimen, it should be prepared in turn for the width of 7.5mm and 5mm small size impact specimens, the impact function indicators were 75% of the standard specimen impact function indicators and 50%;
(4) steel standard impact function indicators higher than the provisions of Table 2-1, but also need to comply with the provisions of the corresponding steel standard. The provisions of the corresponding steel standard.
2.4.2 Elongation at break
(1) The elongation at break of steel plates, tubes and steel forgings used for pressure vessel pressure elements should be in accordance with the standards cited in this specification as well as the provisions of the corresponding steel standards;
(2) Carbon steel for welded structures, low-alloy high-strength steel and low-alloy low-temperature steel plates, the elongation at break (A) index should be in accordance with the provisions of Table 2-2. Provisions:
Table 2-2 steel plate elongation indicators (Note 2-2)
Steel plate standard tensile strength lower limit
Rm (MPa) elongation
A (%)
≤420 ≥23
＞420～550 ≥20
＞550～680 ≥17
Note 2-2: The steel plate standard elongation after interruption index is higher than the provisions of this table, should also comply with the provisions of the corresponding steel plate standard.
(3) for the use of different sizes of specimens after the elongation index, should be in accordance with GB/T 17600.1 "steel elongation conversion Part 1: Carbon steel and low alloy steel" and GB/T 17600.2 "steel elongation conversion Part 2: austenitic steels" for the conversion, the converted index should be in line with the provisions of this article.
2.5 steel ultrasonic testing
2.5.1 Testing requirements
Thickness greater than or equal to 12mm of carbon steel and low alloy steel plate (excluding multi-layer pressure vessel laminates) used in the manufacture of pressure vessel shells, where one of the following conditions are met, it should be ultrasonic testing on a sheet-by-sheet basis:
(1) the degree of toxicity of the contained medium is Extreme, highly hazardous;
(2) used in wet H2S corrosive environment;
(3) design pressure is greater than or equal to 10MPa;
(4) the standards cited in this regulation requires a sheet-by-sheet ultrasonic testing.
2.5.2 Testing of qualified standards
Steel plate ultrasonic testing should be carried out in accordance with the provisions of JB/T 4730 "non-destructive testing of pressurized equipment", used in this procedure 2.5.1 (1) to (3) of the steel plate, the qualification level of not less than Class II, used in this procedure 2.5.1 (4) of the steel plate, the qualification level should be in line with the provisions of the standards cited in this procedure.
2.3.1
2.6 Cast iron for pressure vessels
2.6.1 Cast iron material application restrictions
Cast iron shall not be used to contain the degree of toxicity of very high, high or medium hazardous media, and the design pressure greater than or equal to 0.15MPa of the explosive medium of the pressure vessel pressure element, and shall not be used for shell and tube type waste heat boiler pressure element. In addition to the above pressure vessels, the following cast iron materials are permitted:
(1) Gray cast iron, grades HT200, HT250, HT300 and HT350;
(2) Ductile cast iron, grades QT400-18R and QT400-18L.
2.6.2 Limitations on Design Pressure, Temperature
(1) ) Gray cast iron, design pressure is not more than 0.8MPa, design temperature range of 10 ℃ ~ 200 ℃.
(2)Ductile cast iron,design pressure not more than 1.6MPa,design temperature range of QT400-18R is 0℃～300℃,design temperature range of QT400-18L is -10℃～300℃.
2.7 Non-ferrous Metals for Pressure Vessels
2.7.1 General Requirements
Non-ferrous Metals for Pressure Vessels (Aluminum, Titanium, Copper, Nickel and its alloys, etc.) shall meet the following requirements:
(1) Non-ferrous Metals used in the manufacture of Pressure Vessels, the technical requirements of which shall be in accordance with the standards cited in the Regulations, if there are any special requirements, it is necessary to specify them in the design drawings or corresponding technical documents. Drawings or the corresponding technical documents indicate;
(2) pressure vessel manufacturing unit should establish a strict storage system, and set up a special place, and carbon steel, low alloy steel stored separately.
2.7.2 Aluminum and aluminum alloys
Aluminum and aluminum alloys used in pressure vessels pressure components, should meet the following requirements:
(1) the design pressure is not greater than 16MPa;
(2) magnesium content of more than or equal to 3% of the aluminum alloy (eg, 5083, 5086), the design temperature range of -269 ℃ ~ 65 ℃. Other grades of aluminum and aluminum alloys, its design temperature range is -269 ℃ ~ 200 ℃.
2.7.3 Copper and copper alloys
Pure copper and brass used for pressure vessel pressure components, its design temperature is not higher than 200 ℃.
2.7.4 Titanium and titanium alloys
Titanium and titanium alloys used for pressure vessel pressurized components should meet the following requirements:
(1) Titanium and titanium alloys with a design temperature of not higher than 315 ℃, and titanium-steel composite plate with a design temperature of not higher than 350 ℃;
(2) Titanium and titanium alloys used for manufacturing pressure vessel shells in the annealed state use.
2.7.5 Nickel and nickel alloys
Nickel and nickel alloys shall be used in the annealed or solid solution state when they are used for pressure vessel pressure components.
2.7.6 Tantalum, zirconium, niobium and their alloys
Tantalum, zirconium, niobium and their alloys used in pressure vessel pressure elements should be used in the annealed state. Tantalum and tantalum alloy design temperature is not higher than 250 ℃, zirconium and zirconium alloy design temperature is not higher than 375 ℃, niobium and niobium alloy design temperature is not higher than 220 ℃.
2.8 composite steel plate
Pressure vessels with composite steel plate should be selected in accordance with the provisions of the standards cited in this specification, and in line with the following requirements:
(1) composite steel composite interface bonding shear strength, stainless steel-steel composite plate is not less than 210MPa, nickel-steel composite plate is not less than 210MPa, titanium-steel composite plate is not less than 140MPa, copper-steel composite plate is not less than 140MPa. 140MPa, copper - steel composite plate is not less than 100MPa.
(2) The use of composite steel plate base material state in line with the provisions of the standards cited in this specification.
(3) Carbon steel and low alloy steel base materials (including steel plates and steel forgings) in accordance with the provisions of the base material standards for impact testing, impact function of the qualified indexes in line with the base material standards or the provisions of the ordering contract.
2.9 The use of foreign grade materials
2.9.1 Foreign materials manufacturing unit manufacturing materials
(1) foreign grade materials should be foreign pressure vessels are allowed to use the current standards and norms and there have been instances of use of materials outside the country, and the scope of its use should be in line with the corresponding product standards outside the provisions of the regulations cited in the standard list of similar chemical composition and mechanical properties of the grade. Chemical composition and mechanical properties of the grade, the scope of use should also comply with the provisions of the standard cited in this procedure.
(2) overseas grades of materials shall not be lower than the technical requirements of similar grades of materials within the technical requirements (such as phosphorus, sulfur content, impact specimens of the sampling site, sampling direction and impact function indicators, elongation at break, etc.).
(3) Material quality certification and material marking should be in accordance with the provisions of this regulation 2.1.
(4) pressure vessel manufacturing unit should be incoming materials and material quality certificate for review, and the chemical composition and mechanical properties of the material to verify the re-examination, in line with the relevant requirements before being put into use.
(5) for welding structure pressure vessel pressure components of the material, pressure vessel manufacturing unit before the first use, should master the welding properties of the material and welding process evaluation.
(6) the lower limit of the standard tensile strength greater than or equal to 540MPa steel, low alloy steel for pressure vessels designed for temperatures lower than -40 ℃ steel, materials manufacturing unit should also be in accordance with the provisions of this regulation 1.9 through the technical review, the material can be allowed to use.
2.9.2 Domestic material manufacturing unit manufacturing materials
Domestic material manufacturing unit manufacturing overseas grades of materials, in addition to the requirements of 2.9.1 of the regulations should be consistent with the provisions of this regulation 1.9 should also be in accordance with the provisions of this regulation through the technical review, the review includes the relevant conditions of the material manufacturing unit and the material of the trial production of technical documents.
2.9.3 Selection of foreign grade materials
Design units, if the selection of foreign grade materials, should be fully explained in the design documents, the need and economy.
2.10 The use of new materials
2.10.1 Materials not included in the standards cited in this procedure
Pressure vessel main pressure components using materials not included in the standards cited in this procedure, the development of materials before the trial production of the material development unit should be carried out systematic testing and research, and should be in accordance with the provisions of 1.9 of this procedure through the technical review, the material can be allowed to use.
2.
2.10.2 Materials that have been included in the standard cited in this procedure
The lower limit of tensile strength of steel has been included in the standard GB 150 or JB 4732 is greater than or equal to 540MPa, as well as for the design of the pressure vessel temperature is lower than -40 ℃ low alloy steel, if the steel manufacturing unit does not have the steel manufacturing or pressure vessel application performance, then it should be used. Or pressure vessel application performance, it should be a systematic test research work, and should be in accordance with the provisions of this regulation 1.9 through the technical review, the steel can be allowed to use.
2.11 Material use and marking transplantation
(1) Pressure vessel manufacturing unit should be through the material supply unit for inspection, evaluation, tracking and other methods to ensure that the pressure vessel materials used in accordance with the requirements of this procedure, and in the material into the factory to review the material quality certificate and material marking;
(2) For the procurement of class Ⅲ pressure vessel with Ⅳ forgings, and can not determine the quality of the material. Ⅳ forgings, and can not determine the authenticity of the material quality certificate or the performance and chemical composition of the main pressure element materials in doubt, the pressure vessel manufacturing unit should be re-examined, in line with the provisions of these regulations before the material can be put into use.
(3) used in the manufacture of pressure vessels pressure components of the material should be divided before marking transplantation.
2.12 welding materials
(1) used in the manufacture of pressure vessels pressure components of welding materials, should ensure that the mechanical properties of the weld metal is higher than or equal to the limit value of the parent material, when necessary, other properties shall not be lower than the corresponding requirements of the parent material;
(2) welding materials should meet the corresponding welding standards and standards cited in the Regulations requirements, and With quality certificates and clear, solid signs;
(3) pressure vessel manufacturing unit should be established and strictly enforce the acceptance of welding materials, re-examination, storage, drying, distribution and recycling system.
2.12 material substitution
Pressure vessel manufacturing or on-site welding unit of the main pressure components of the material substitution, should obtain the written approval of the original design unit, and in the as-built drawings to make detailed records.
3 Design
3.1 Design unit licensing qualifications and responsibilities
(1) design unit should be responsible for the quality of the design, pressure vessel design unit licensing qualifications, design categories, varieties and levels of the scope of the division should be in line with the "Pressure Vessels and Pressure Piping Design Licensing Rules" regulations;
(2) the overall use of the rules of the design criteria. Partial reference to the analysis of the design standards for pressure vessel pressure element analysis and calculation of the unit, you can not get the stress analysis design license project qualification;
(3) the design of the pressure vessel should be in line with the basic safety requirements of these rules, for the use of international standards or overseas standards for the design of pressure vessels, the design of the unit should be to provide the design documents and the basic safety requirements of the regulations of conformity Affirmation;
(4) pressure vessel design unit shall provide complete design documents to the design commissioner.
3.2 Design license seal
(1) pressure vessel design master plan, must be stamped with the pressure vessel design license seal (duplicate seal is invalid), the design license seal invalid drawings and drawings have been stamped with as-built drawings shall not be used for the manufacture of pressure vessels;
(2) pressure vessel design license seal in the design of the design unit's name must be the same as that of the design of the design seal stamped with the design unit's name. The name of the design unit in the drawing must be consistent with the design unit name in the stamped design.
3.3 Design conditions
The commissioner of the design of the pressure vessel should be in formal written form to the design unit of the pressure vessel design conditions. Design conditions include at least the following:
(1) operating parameters (including working pressure, operating temperature range, liquid level height, take over the load, etc.);
(2) pressure vessel use and its natural conditions (including ambient temperature, seismic intensity, wind and snow load, etc.);
(3) media components and characteristics;
(4) expected service life;
(5) geometric parameters and orifice orientation;
(6) other necessary conditions required for design.
3.4 Design Documents
3.4.1 General Requirements
(1) The design documents of the pressure vessel include strength calculations or stress analysis report, design drawings, manufacturing technical conditions, risk assessment report (applicable to Class III pressure vessels), the design unit considers necessary, should also include the installation and use of maintenance instructions.
(2) installed safety valve, rupture disc device pressure vessel, the design documents should also include the pressure vessel safety relief, safety valve displacement and rupture disc discharge area of the calculation; can not be calculated, the design unit should be designed in conjunction with the commissioning unit or the use of the unit, the selection of the consultation of the overpressure relief device.
3.4.2 General design drawings
3.4.2.1 Approval of general design drawings
General design drawings should be in accordance with the requirements of the relevant safety specifications to fulfill the approval procedures. For class Ⅲ pressure vessel, there should be a pressure vessel design unit of the technical responsible person or his authorized person's approval signature.
3.4.2.2 The main content of the general plan
Pressure vessels on the design of the general plan, at least the following should be indicated:
(1) the name of the pressure vessel, the category, the design, manufacture of the main regulations based on the standard;
(2) working conditions, including working pressure, operating temperature, toxicity of the medium and the degree of explosion hazard.
(3) design conditions, including design temperature, design load (including pressure, including all loads should be considered), medium (components), corrosion margin, welded joint coefficients, natural conditions, etc., for the storage of liquefied gases tanks should be indicated loading coefficients, the tendency to stress corrosion of storage containers should be indicated the corrosive medium of the limited content;
(4) the main pressure Component material grades and standards;
(5) the main characteristics of the parameters (such as the volume of the pressure vessel, heat exchanger area and the number of strokes, etc.);
(6) the design life of the pressure vessel (fatigue vessels marked cycle times);
(7) special manufacturing requirements;
(8) heat treatment requirements;
(9) non-destructive testing requirements ;
(10) Pressure resistance test and leakage test requirements;
(11) Corrosion prevention requirements.
(12) Specification and ordering special requirements for safety accessories (except those already considered by the process system);
(13) Location of the pressure vessel nameplate;
(14) Requirements for packaging, transportation, on-site group welding and installation.
3.4.2.3 Special requirements
Special requirements for the design of the general drawing for the following cases:
(1) Multi-chamber pressure vessels were indicated multi-chamber test pressure, with special requirements indicate **** with the allowable pressure difference between the two sides of the component, as well as the test steps and test requirements;
(2) pressure vessels and pressure vessels containing catalysts and filling materials with Pressure vessels, indicating the technical requirements for periodic inspection during use;
(3) Pressure vessels which cannot be internally inspected due to structural reasons, indicating the calculated thickness, and the requirements for periodic inspection during use;
(4) Pressure vessels which cannot be pressure-resistant tested, indicating the calculated thickness and the special requirements for manufacture and use;
(6) Pressure vessels with insulating linings, indicating the allowable pressure difference between the sides of the pressure elements prevented from being pressurized, and the test procedure and test requirements; and Pressure vessels, indicating the prevention of over-temperature of the pressurized components of the technical measures;
(6) require thermal insulation or cooling of the pressure vessel, the proposed thermal insulation or cooling measures.
3.5 Design method
The design of the pressure vessel can be designed using the rule design method or analytical design method. If necessary, experimental methods or comparable empirical design methods can also be used, but should be in accordance with the provisions of this regulation 1.9 through the technical review.
Pressure vessel design unit shall be based on the design conditions described in 3.3 of this regulation, taking into account all relevant factors, failure modes and adequate safety margins to ensure that the pressure vessel has sufficient strength, stiffness, stability and corrosion resistance, but also should consider the skirt, legs, lugs and other welded joints with the main body of the pressure vessel, to ensure that the pressure vessel in the design of the safety of the service life. Safety within the design life of the pressure vessel.
3.6 Risk Assessment
The Ⅲ type of pressure vessel, the design should be issued, including the main failure modes and risk control and other content of the risk assessment report.
3.7 Energy-saving requirements
The design of the pressure vessel shall give full consideration to the principle of energy saving and consumption reduction, and meet the following requirements:
(1) give full consideration to the economy of the pressure vessel, reasonable selection of materials, and reasonably determine the structural dimensions;
(2) optimization of the design of the heat transfer vessel, to improve the efficiency of the heat transfer, to meet the energy efficiency requirements;
(3) For pressure vessels with insulation or cooling requirements, effective insulation or cooling measures should be proposed in the design documents.
3.8 Safety coefficient
The minimum safety coefficient for determining the permissible stress (or design stress intensity) of the pressure vessel material is specified in Table 3-1 to Table 3-3. Factor of safety lower than these provisions, shall comply with the requirements of 1.9 of this specification.
Table 3-1 safety factor for the code design method
Materials