NB/T 11270-2023 Titanium pressure vessels
1 Scope
1.1 This document specifies the material, design, manufacturing, inspection and acceptance requirements for titanium pressure vessels. It is applicable to single-layer plate welded pressure vessels (including pipe tubes) with their shells entirely made of titanium. This document may apply to the material, design, manufacturing, inspection and acceptance requirements for titanium atmospheric vessel by reference.
1.2 This document is applicable to titanium pressure vessels with design pressure not greater than 35MPa.
1.3 For titanium materials to which this document applies, the design temperature is up to 315℃.
1.4 The design and calculation methods listed in this document are applicable to pressure element made entirely of titanium. The parts of titanium pressure vessels made of non-titanium materials shall be designed and calculated according to the product standards of corresponding materials.
1.5 This document is not applicable to the following pressure vessels:
a) vessels with a design pressure lower than 0.1MPa and a vacuum degree lower than 0.02MPa;
b) vessels under the jurisdiction of Supervision regulation on safety technology for transportable pressure vessel.
c) pressure vessels used for military equipment, nuclear installations, aerospace vehicles, railway locomotives, offshore installations and ships, and those used underground in mines;
d) compressor chambers (e.g. pump casing, compressor casing, turbine casing, hydraulic cylinder, papermaking roll, etc.) in rotating or reciprocating mechanical equipment as a whole or as components;
e) vessels heated by flame directly;
f) plate heat exchanger, spiral plate heat exchanger, air-cooled heat exchanger and cooling pipe;
g) vessels with the volume capacity (the geometric volume with permanent internals deducted) less than 0.03m3 or inside diameter (the maximum geometric size of inner section boundary for vessels with non-circular section) less than 150mm;
h) vessels for fatigue analysis.
1.6 Definition of vessel range
1.6.1 Connection between the vessel and the external tube:
a) the groove end face of the first girth joint of welded connection;
b) the end face of the first threaded joint of threaded connection;
c) the first flange sealing surface of flanged connection;
d) the first sealing surface of connection by special connecting piece or pipe fittings.
1.6.2 The pressure seal heads, flat covers and fasteners of nozzles, manholes and handholes.
1.6.3 The connection welds between pressure elements and non-pressure elements.
1.6.4 Non-pressure elements directly connected to the vessels, such as supports and skirt.
1.6.5 Over pressure relief device.
1.7 Vessels or pressure elements with the structural dimensions that cannot be determined in accordance with this document may be designed by the following methods:
a) adopt verification test (such as experimental stress analysis, verification hydraulic test) to analyze and design, and comply with GB/T 150.1;
b) conduct comparative experience design by the comparable structure that have been used, and comply with GB/T 150.1;
c) adopt stress analysis, calculation and assessment including finite element method, and comply with GB/T 150.1.
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 Pressure vessels - Part 1: General requirements
GB/T 150.2 Pressure Vessels - Part 2: Materials
GB/T 150.3 Pressure vessels - Part 3: Design
GB/T 150.4 Pressure vessels - Part 4: Fabrication, inspection and testing, and acceptance
GB/T 151 Heat exchangers
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 197 General purpose metric screw threads - Tolerances
GB/T 1804 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 2965 Titanium and titanium alloy bars
GB/T 3620.1-2016 Designation and composition of titanium and titanium alloys
GB/T 3620.2 Titanium and titanium alloy permissible variations of chemical composition for wrought product analysis
GB/T 3621-2007 Titanium and titanium alloy plate and sheet
GB/T 3624-2010 Titanium and titanium alloy seamless tubes
GB/T 3625-2007 Titanium and titanium alloy tube for condensers and heat exchangers
GB/T 4842 Argon
GB/T 4844 Pure helium, high pure helium and ultra pure helium
GB/T 5193 Method of ultrasonic inspection for wrought titanium and titanium alloy products
GB/T 12337 Steel spherical tanks
GB/T 12969.1 Method of ultrasonic inspection for titanium and titanium alloy tubes
GB/T 12969.2 Method of eddy current inspection for titanium and titanium alloy tubes
GB/T 16598-2013 Titanium and titanium alloy disc and ring
GB/T 16749 Bellows expansion joints for pressure vessel
GB/T 25198 Heads for pressure vessels
GB/T 31908 Tungsten electrodes for arc welding and plasma welding and cutting
HG/T 20592~20635 Steel pipe flanges, gaskets and bolting
NB/T 11025 Reinforcing pad
NB/T 10558 Coating and packing for pressure vessels transport
NB/T 47002.3 Clad plate for pressure vessel - Part 3: Titanium-steel clad plate
NB/T 47013.2 Nondestructive testing of pressure equipment - Part 2: Radiographic testing
NB/T 47013.3 Nondestructive testing of pressure equipment - Part 3: Ultrasonic testing
NB/T 47013.5 Nondestructive testing of pressure equipment - Part 5: Penetrant testing
NB/T 47013.7 Nondestructive testing of pressure equipment - Part 7: Visual examination
NB/T 47013.8 Nondestructive testing of pressure equipment - Part 8: Leakage testing
NB/T 47014 Welding procedure qualification for pressure equipment
NB/T 47016 Mechanical property tests of product welded test coupons for pressure equipment
NB/T 47018.7 Specification of welding materials for pressure equipment - Section 7: Titanium and titanium-alloy welding electrodes and rods
NB/T 47019.8 Purchase technical specification for boiler & heater exchanger tubes - Part 8: Titanium and titanium alloy
NB/T 47020~47027 Flanges, gaskets and stud bolts & nut for pressure vessels
NB/T 47041 Vertical vessels supported by skirt
NB/T 47042 Horizontal vessels on saddle supports
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 150.1 and GB/T 151 and the following apply.
3.1
titanium pressure vessels
pressure vessels with their shells entirely made of titanium
3.2
inserted strip
metal pieces placed under a strip cover or lining, most of which are embedded in the machining grooves of clad plates or lined vessel shells, so that they are level with adjacent cladding or lining
3.3
strip cover
corrosion-resistant metal pieces which cover the coating of clad plates or lining of lined containers and are connected by fillet welding
3.4
press working
production method for obtaining raw materials, blanks or finished products with certain shape, size and mechanical properties by using the plastic deformation of metals under the action of external force
4 General requirements
4.1 The design, manufacturing, inspection and acceptance of the vessels shall not only meet the requirements of this document, but also meet those of relevant laws, regulations and safety technical codes issued in China.
4.2 The design and manufacturing of the pressure vessels under the jurisdiction of TSG 21 shall be under the supervision of the safety supervision organization of special equipment.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 Materials
6 Design
7 Fabrication, inspection and acceptance
Annex A (Normative) Titanium-clad pressure vessels and titanium-lined pressure vessels
Annex B (Informative) Welding procedure specifications for titanium vessels
Annex C (Informative) Designations and properties of titanium materials for pressure vessels
Annex D (Informative) Connection structures for titanium vessels, titanium-clad vessels, and titanium-lined vessels
