GB/T 18442.7-2017 English PDF (GBT18442.7-2017)

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GB/T 18442.7-2017: Static vacuum insulated cryogenic pressure vessels -- Part 7: Rules of pressure strengthening for inner vessels
GB/T 18442.7-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.40
A 82
Static vacuum insulated cryogenic pressure vessels - Part
7. Rules of pressure strengthening for inner vessels
ISSUED ON. NOVEMBER 01, 2017
IMPLEMENTED ON. MAY 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms, definitions and symbols ... 6 
4 General requirements ... 7 
5 Material ... 7 
6 Design ... 9 
7 Manufacture and inspection ... 11 
Annex A (informative) Important quality control points during manufacturing
process of pressure strengthening inner vessels ... 18 
Annex B (informative) Approximate control and requirements of Austenitic
stainless-steel number ... 20 
Annex C (informative) Requirements for test of pressure strengthening process
verification ... 21 
Annex D (informative) Test piece pre-tensile and test rules ... 27 
Annex E (normative) Pressure strengthening treatment ... 31 
Static vacuum insulated cryogenic pressure vessels - Part
7. Rules of pressure strengthening for inner vessels
1 Scope
This Part of GB/T 18442 specifies the technical requirements for material,
design, manufacture and inspection of the inner vessels of static vacuum
insulated cryogenic pressure vessels (hereinafter referred to as the inner
vessels) that are manufactured by pressure strengthening technology.
This Part is applicable the inner vessels that meet the following conditions at
the same time.
a) in accordance with the provisions of 1.2 of GB/T 18442.1, the medium is
frozen liquefied gas;
b) the material is austenitic stainless steel;
c) the nominal thickness is not less than 4mm and not more than 24mm,
consisting of a single diameter cylinder and a standard oval head;
d) the strain strengthening is completed at room temperature.
This Part is not applicable to the inner vessels that contain mediums of which
the toxicity hazard is moderate and above.
2 Normative references
The following referenced documents are indispensable for the application 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 (all parts), Pressure vessels
GB/T 228.1, Metallic materials - Tensile testing - Part 1. Method of test at
room temperature
GB/T 229, Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 232, Metallic materials - Bend test
GB/T 2653, Methods of bend and compression tests for welded joint
GB/T 3808, Verification of pendulum-type impact testing machines
GB/T 12160, Calibration of extensometers used in uniaxial testing
GB/T 14976, Seamless stainless-steel pipes for fluid transport
GB/T 16825.1, Verification of static uniaxial testing machines - Part 1.
Tension/compression testing machines - Verification and calibration of the
force-measuring system
GB/T 18442.1~18442.6, Part 1~Part 6 of Stationary Vacuum Thermal-
Insulating Cryogenic Pressure Vessel
GB/T 24511, Stainless steel and heat resisting steel plate, sheet and strip for
pressure equipment
NB/T 47010, Stainless and heat-resisting steel forgings for pressure
equipment
NB/T 47013.2, Nondestructive testing of pressure equipment Part 2.
Radiographic testing
NB/T 47013.5, Nondestructive testing of pressure equipment Part 5.
Penetrant testing
NB/T 47013.11, Nondestructive Testing of Pressure Equipment Part 11.
Standard practice for X-ray digital radiography
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 47018.1, Technical permission of welding materials for pressure
equipment - Part 1. General rule
NB/T 47018.2, Technical permission of welding materials for pressure
equipment - Part 2. Electrodes for steel
NB/T 47018.3, Technical permission of welding materials for pressure
equipment - Part 3. Steel electrodes and rods for gas shielded arc welding
NB/T 47018.4, Technical permission of welding materials for pressure
equipment - Part 4. Electrodes and fluxes for submerged arc welding
JB 4732-1995, Steel Pressure Vessels - Design by Analysis (confirmed in
2005)
4 General requirements
4.1 In addition to all parts of this Standard, the material, design, manufacture
and inspection as well as marks of the inner vessels shall also comply with the
relevant laws, regulations, safety technical specifications and relevant
standards promulgated by the country.
4.2 When the inner vessels manufactured by pressure strengthening
technology beyond the scope of this Part, it shall be implemented in accordance
with the relevant provisions of TSG 21.
4.3 The manufacturer shall carry out the manufacture of the inner vessels in its
organization, verify the welding process and pressure strengthening process
adopted by it, and be responsible for the correctness and completeness of the
process documents.
4.4 The manufacturer shall upload the mechanical performance data of the
welded test piece and the data of the pressure strengthening test process to
the national strain-enhanced cryogenic container manufacturing information
public service platform.
4.5 The special equipment supervision and inspection agency shall supervise
and inspect the pressure strengthening process adopted by the inner vessels
and the important quality control points proposed in Annex A, which shall meet
the requirements of this Part.
5 Material
5.1 Steel plate
5.1.1 The designation and mechanical properties of the steel plate shall comply
with the requirements of Table 1. The supply status is solid solution heat
treatment and meets the requirements of GB/T 150.2 and GB/T 24511.
5.1.2 The steel plate shall be re-inspected. It shall at least contain the following
information.
a) Check the surface quality and material marking of the steel plate one by
one;
b) Re-inspect the tensile properties of steel plate at room temperature;
c) If the open plate is used, the re-inspection requirements shall also comply
with the relevant provisions of GB/T 150.4.
5.1.3 The sampling quantity and position of tensile test shall be in accordance
When using the materials other than Table 1 and Table B.1 to manufacture the
inner vessels with the pressure strengthening technology, it shall also comply
with the relevant provisions of TSG 21.
6 Design
6.1 General
6.1.1 In addition to the provisions of this Part, the design of the inner vessels
shall also comply with the provisions of TSG 21, GB/T 150 and GB/T 18442.3.
6.1.2 The designer shall issue a risk assessment report for the vacuum
insulated cryogenic pressure vessels manufactured by pressure strengthening
technology. The content of the report, in addition to the provisions of GB/T 150.1,
shall also include the failure mode as well as risk control caused by pressure
strengthening technology.
6.1.3 The design of the inner vessels shall indicate "using pressure
strengthening technology", as well as strengthening pressure, diameter before
strengthening.
6.1.4 The diameter and thickness of the inner vessel involved in this chapter
are the parameters before the pressure strengthening treatment. Does not
consider cha...