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GB/T 18442.1-2019 (GB/T18442.1-2019)

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GB/T 18442.1-2019: PDF in English (GBT 18442.1-2019)
GB/T 18442.1-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.40
J 76
Replacing GB/T 18442.1-2011
Static vacuum insulated cryogenic pressure vessels -
Part 1: General requirements
ISSUED ON: DECEMBER 10, 2019
IMPLEMENTED ON: DECEMBER 10, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 6 
3 Terms and definitions ... 7 
4 General requirements ... 8 
Bibliography ... 13 
Static vacuum insulated cryogenic pressure vessels -
Part 1: General requirements
1 Scope
This Part of GB/T 18442 specifies the basic requirements for static vacuum
insulated cryogenic pressure vessels (hereinafter referred to as "cryogenic
vessels"). The cryogenic vessels specified in GB/T 18442 include tanks,
pipelines, safety accessories, instruments, loading-unloading accessories,
supports, pressure build coils, and carburetors, etc.
Note 1: The tank is defined as follows:
a) The groove end face of the first girth joint of the welded connection between the
tank and the external pipeline; the end face of the first threaded joint of the
threaded connection; the first flange sealing surface of the flange connection;
b) End caps and fasteners in the opening of the tank;
c) Attachment weld between tank and non-pressure component.
Note 2: The pipeline includes all the pipes and fittings, which may come into contact with
the medium, of the cryogenic vessel.
Note 3: The main pressure components include inner vessel barrel, inner vessel head; and
tube socket, flange, craft manhole barrel, craft manhole head, etc. in contact with
the medium.
This Part applies to cryogenic vessels, which simultaneously meet the following
conditions:
a) The working pressure of the inner vessel is not less than 0.1 MPa;
b) The geometric volume is not less than 1 m3;
c) The insulation method is vacuum powder insulation, vacuum composite
insulation, or high vacuum multilayer insulation;
d) The storage medium is a refrigerated liquefied gas with a standard boiling
point of not lower than -196 °C.
This Part does not apply to cryogenic vessels in the following scope:
a) The material of inner vessel and outer jacket is non-ferrous metal or non-
TSG 07 Regulation for Production and Filling Licensing of Special Equipment
3 Terms and definitions
The terms and definitions defined in GB/T 150 and GB/T 26929 and the
following ones apply to this document.
3.1
Annular space
A closed space formed between the inner vessel and the outer jacket.
3.2
Tank
A pressure vessel composed of an inner vessel, an outer jacket, and an
insulation layer, etc.
3.3
Inner vessel
An inner container which stores refrigerated liquefied gas and can withstand
working pressure.
3.4
Outer jacket
A sealed vessel which forms and protects a vacuum insulated space.
3.5
Refrigerated liquefied gas
A gas which is partially liquid due to low temperature during storage. The critical
temperature is generally not higher than -50 °C.
3.6
Vacuum insulated cryogenic pressure vessel
The pressure vessel used to store refrigerated liquefied gas, which consists of
a liquid storage inner vessel and an outer jacket that maintains a vacuum
insulated space, and has a complete set of safety accessories, instrumentation
and systems meeting the operation requirements.
4.2 Qualifications and responsibilities
4.2.1 Qualifications
The design and fabrication organizations shall, in accordance with the
provisions of TSG 07 and TSG 21, obtain the corresponding qualification
certificates issued by the relevant national authorities.
4.2.2 Responsibilities
4.2.2.1 Responsibilities of design client
The design client of cryogenic vessel shall, in writing, propose the design
conditions of the cryogenic vessel to the design organization. The design
conditions include at least the following:
a) Safety technical specifications and product standards that design and
fabrication shall follow;
b) Operating parameters (including working pressure, working temperature
range, filling volume, takeover load, etc.);
c) Place of use and its natural conditions (including ambient temperature,
seismic fortification intensity, basic wind pressure or wind speed, basic
snow pressure, etc.);
d) Filling medium, including the number, name, category, composition,
physical and chemical properties, hazardous characteristics, harmful
impurities content of the medium, and the corrosion rate of the medium to
the tank material, etc.;
e) Expected service life of cryogenic vessel and service life of annular space
vacuum;
f) Geometric parameters and nozzle orientation;
g) Other necessary conditions required by the design (such as selection of
tank material, structural style, insulation method, anticorrosion, surface
treatment, transportation, and special requirements, etc.).
4.2.2.2 Responsibilities of design organization
4.2.2.2.1 The design organization shall, based on the content of the risk
assessment report, complete the product design and be responsible for the
correctness and completeness of the design documents.
4.2.2.2.2 The approval of design documents, the management and use of
special design seals shall meet the requirements of TSG 21.
a) Design documents;
b) Manufacturing process diagram or manufacturing process card;
c) Welding process and heat treatment process documents;
d) Records of inspection and test items specified in the standard;
e) Check, inspection, and test records during the fabrication process and
after completion;
f) Exit-factory data.
4.2.2.3.10 The exit-factory data of the product shall meet the requirements of
TSG 21 and meet the requirements of GB/T 18442.4.
4.3 Classification of welded joints
4.3.1 The welded joints between the tank and pipeline pressure components
are divided into four classes, A, B, C, and D; as shown in Figures 1 to 3. The
classification requirements are as follows:
a) The longitudinal joint of the cylinder part, the girth joint between the
spherical head and the cylinder, and all splicing joints of various convex
heads are all class A welded joints;
b) The girth joints of the shell part, the butt girth joints of the craft manhole
barrel and its head, and the butt girth joints between the pressure
components such as pipes, fittings, and tube sockets are all class B
welded joints; but except for welded joints which have been specified as
class A;
c) The joints of non-butt connection between flat cover and cylinder, and the
joints of non-butt connection between flange and pipe are all class C
welded joints; but except for welded joints which have been specified as
classes A and B;
d) The joints connected with the shell such as pipe, craft manhole barrel,
tube socket, flange, stiffening ring, pipe cap, and reinforcing ring, the joints
between the pipes, the non-butt joints between the pipes and the sockets,
and the non-butt joints between the pipe caps, pipe fittings, flanges and
the pipes are all class D welded joints; but except for welded joints which
have been specified as classes A, B, and C.
4.3.2 The attachment joints of non-pressure components and pressure
components are class E welded joints; as shown in Figure 1 and Figure 2.
......
 
(Above excerpt was released on 2020-06-12, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT18442.1-2019