NB/T 47003.1-2022
Atmospheric pressure vessels - Part 1: Steel welded atmospheric pressure vessels
1 Scope
1.1 This document specifies the requirements for the design, fabrication, inspection and testing, and acceptance of steel welded atmospheric pressure vessels (hereinafter referred to as "vessels").
1.2 This document applies to the vessels with the following design pressure and design temperature ranges:
a) Cylindrical vessels: design pressure: >-0.02MPa and <0.1MPa; design temperature: ≤350℃.
b) Rectangular vessels: design pressure: 0MPa; design temperature: ≤350℃.
1.3 This document applies to the following structural forms:
a) Vertical cylindrical vessels with lug, leg, bracket, skirt or rigid ring supports;
b) Horizontal cylindrical vessels;
c) Rectangular vessels.
1.4 This document does not apply to the following types of vessels:
a) Vessels subjected to direct flame heating;
b) Vessels exposed to nuclear radiation;
c) Vessels containing extremely or highly toxic contents;
d) Vessels buried directly in the ground;
e) Liftable gas holders;
f) Vessels that are frequently handled;
g) Silos;
h) Cylindrical vessels with a geometric volume of greater than 300m3;
i) Vertical vessels supported by skirt with a height-to-average-diameter ratio of greater than 5;
j) Low-temperature pressure vessels.
1.5 Boundary scope of vessels:
The boundary scope of a vessel within this document refers to the vessel shell and the parts and components connected with it as a whole, and is delimited within the following scope.
a) Connections between the vessel and the external tubes:
1) The groove end face of the first circumferential joint in welded connection;
2) The end face of the first threaded joint in threaded connection;
3) The first flange sealing surface in flange connection;
4) The first sealing surface connected with special connecting pieces or pipe fittings.
b) Formed heads, flat covers and fasteners for nozzles, manholes, handholes, etc.
c) Accessories such as support parts, opening reinforcement parts, and backing plates of the vessel, and their joint welds with the shell.
d) Safety accessories and instruments directly installed on the vessel.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 150.1-2011 Pressure vessels - Part 1: General requirements
GB/T 150.2-2011 Pressure vessels - Part 2: Materials
GB/T 150.3-2011 Pressure vessels - Part 3: Design
GB/T 150.4-2011 Pressure vessels - Part 4: Fabrication, inspection and testing, and acceptance
GB/T 699 Quality carbon structure steels
GB/T 700 Carbon structural steels
GB 713 Steel plates for boilers and pressure vessels
GB/T 983 Covered electrodes for manual metal arc welding of stainless and heat-resisting steels
GB/T 1220 Stainless steel bars
GB/T 1591 High strength low alloy structural steels
GB/T 1804-2000 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 3077 Alloy structure steels
GB/T 3091 Welded steel pipes for low pressure liquid delivery
GB/T 3274 Hot-rolled plates, sheets and strips of carbon structural steels and high strength low alloy structural steels
GB/T 4237 Hot rolled stainless steel plate, sheet and strip
GB/T 5117 Covered electrodes for manual metal arc welding of non-alloy and fine grain steels
GB/T 5118 Covered electrodes for manual metal arc welding of creep-resisting steels
GB/T 5293 Solid wire electrodes, tubular cored electrodes and electrode/flux combinations for submerged arc welding of non alloy and fine grain steels
GB/T 6479 Seamless steel tubes for high-pressure chemical fertilizer equipments
GB/T 8162 Seamless steel tubes for structural purposes
GB/T 8163 Seamless steel pipes for liquid service
GB/T 8165-2008 Stainless steel clad plates, sheets and strips
GB/T 12470 Solid wire electrodes, tubular cored electrodes and electrode/flux combinations for submerged arc welding of creep-resisting steels
GB/T 13296 Seamless stainless steel tubes for boiler and heat exchanger
GB/T 14957 Steel wires for melt welding
GB/T 14976 Seamless stainless steel pipes for fluid transport
GB/T 21833 Austenitic - Ferritic (duplex) grade stainless steel seamless tubes and pipes
GB/T 24511 Stainless steel and heat resisting steel plate, sheet and strip for pressure equipments
GB/T 26929 Terminology for pressure vessels
GB 50009 Load code for the design of building structures
GB 50341-2014 Code for design of vertical cylindrical welded steel oil tanks
HG/T 20582-2020 Standard of strength calculation for steel chemical vessels
HG/T 20583 Standard for structural design of steel chemical vessel
HG/T 20592~20635 Steel pipe flanges, gaskets and bolting
HG/T 21514~21535 Steel manholes and handholes
HG/T 21594,
HG/T 21596~21600, HG/T 21602~21604 Lining stainless steel manholes and handholes
NB/T 10558 Coating and packing for pressure vessels transport
NB/T 47002.1-2019 Clad plate for pressure vessel - Part 1: Stainless steel-steel clad plate
NB/T 47002.2-2019 Clad plate for pressure vessel - Part 2: Nickel-steel clad plate
NB/T 47002.3-2019 Clad plate for pressure vessel - Part 3: Titanium-steel clad plate
NB/T 47002.4-2019 Clad plate for pressure vessel - Part 4: Copper-steel clad plate
NB/T 47008 Carbon and alloy steel forgings for pressure equipment
NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipment
NB/T 47013.1-2015 Nondestructive testing of pressure equipments - Part 1: General requirements
NB/T 47013.2-2015 Nondestructive testing of pressure equipments - Part 2: Radiographic testing
NB/T 47013.3-2015 Nondestructive testing of pressure equipments - Part 3: Ultrasonic testing
NB/T 47013.4-2015 Nondestructive testing of pressure equipments - Part 4: Magnetic particle testing
NB/T 47013.5-2015 Nondestructive testing of pressure equipments - Part 5: Penetrant testing
NB/T 47013.10-2015 Nondestructive testing of pressure equipments - Part 10: Ultrasonic time of flight diffraction technique
NB/T 47014 Welding procedure qualification for pressure equipment
NB/T 47015 Welding specification for pressure vessels
NB/T 47018 (All parts) Technical permission of welding materials for pressure equipment
NB/T 47021 A-type socket-weld flange
NB/T 47022 B-type socket-weld flange
NB/T 47023 Welding neck flange
NB/T 47041 Vertical vessels supported by skirt
NB/T 47042 Horizontal vessels on saddle supports
NB/T 47065.1 Vessel support - Part 1: Saddle support
NB/T 47065.2 Vessel support - Part 2: Leg support
NB/T 47065.3 Vessel support - Part 3: Lug support
NB/T 47065.4 Vessel support - Part 4: Bracket support
NB/T 47065.5 Vessel support - Part 5: Support lugs with rigid rings
YB/T 5092 Stainless steel wires for welding
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 26929 and the following apply.
3.1
pressure
force acting vertically on a unit surface area of a vessel, which, unless otherwise indicated, refers to gauge pressure in this document
3.2
operating pressure
maximum possible pressure on the top of a vessel under normal operating conditions
3.3
design pressure
preset maximum pressure on the top of a vessel, which shall be taken as the basic design load conditions together with the corresponding design temperature, and the value of which shall not be less than the operating pressure
3.4
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
3.5
test pressure
pressure on the top of a vessel during pressure test or leakage test
3.6
metal temperature
average temperature along the metal section of the vessel part
3.7
design temperature
metal temperature set for parts when the vessel is under normal operating conditions, which, together with the design pressure, is taken as the design load conditions
3.8
test temperature
metal temperature of the vessel shell during pressure test or leakage test
3.9
minimum design metal temperature
minimum metal temperature of each part under various possible conditions expected during the operation of the vessel when such vessel is designed
3.10
required thickness
thickness calculated using the formulae given in each clause, which shall also include, if necessary, the thickness required for other loads (see 4.3.2)
3.11
design thickness
sum of required thickness and corrosion allowance
3.12
nominal thickness
sum of design thickness and negative deviation of steel thickness, rounded up to the nearest standard thickness of steel
3.13
effective thickness
thickness obtained by deducting the corrosion allowance and negative deviation of steel thickness from the nominal thickness
3.14
minimum required fabrication thickness
minimum thickness required to ensure meeting the design requirements after the pressure part is fabricated
3.15
low-temperature pressure vessel
vessels made of carbon steel, low alloy steel, duplex stainless steel and ferritic stainless steel with a design temperature of less than -20℃ and those made of austenitic stainless steel with a design temperature of less than -196℃
4 General requirements
4.1 General
4.1.1 In addition to the requirements of this document, the design, fabrication, inspection and testing, and acceptance of the vessels shall also comply with the relevant laws and regulations of the nation as well as safety technical specifications.
4.1.2 The design unit and fabrication unit of the vessels shall establish and effectively implement a sound quality management system.
4.2 Responsibilities
4.2.1 Responsibilities of the user and the design entrusting party
The user or design entrusting party of the vessels shall submit the User's Design Specification (UDS) to the design unit in due written form, at least incorporating:
a) The main standards and specifications on which the vessel design is based;
b) Operating parameters (including operating pressure, operating temperature range, liquid level, and nozzle load);
c) Place of use and natural conditions (including ambient temperature, seismic precautionary intensity, wind load, and snow load);
d) Components and characteristics of the contents;
e) Expected service life;
f) Geometric parameters and orifice orientation;
g) Other necessary conditions required for design.
4.2.2 Responsibilities of the design unit
a) The design unit shall be responsible for the correctness and integrity of the design documents;
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 Materials
6 Basic structural parts
7 Cylindrical vessels
8 Rectangular vessel
9 Fabrication, inspection and testing, and acceptance
Annex A (Informative) Alternative design method for the structure of cylinder-to-head joint
Annex B (Informative) Calculation of local stresses in the shell at the joint with support
