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GB/T 18442 consists of the following seven parts under the general title Static vacuum insulated cryogenic pressure vessels:
——Part 1: General requirements;
——Part 2: Materials;
——Part 3: Design;
——Part 4: Fabrication;
——Part 5: Inspection and testing;
——Part 6: Safety protection;
——Part 7: Rules of pressure strengthening for inner vessels.
This is Part 1 of GB/T 18442.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 18442.1-2011 Static vacuum insulated cryogenic pressure vessel - Part 1: General requirements, with respect to which, the following main technical changes have been made:
——the application and non-application scopes are modified;
——eight terms and definitions, such as vacuum fibre insulation and vacuum insulation, are deleted; six terms and definitions such as annular space, tank and inner vessel, are added; four terms and definitions, such as vacuum insulation cryogenic pressure vessel and high vacuum multilayer insulation, are revised;
——the responsibilities of the design entrusting party are added, and the qualifications and responsibilities of the design unit and the fabrication unit are modified;
——the requirements of design documents and general design drawings are deleted and adjusted to the design part in GB/T 18442.3.
——the classification of welded joints of tank pressure elements in GB/T 18442.4-2011 is included in this part, and the diagram for classification of welded joints for outer jacket and pipeline are added.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This part was proposed by and is under the jurisdiction of the National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC 262).
The previous editions of this part are as follows:
——GB/T 18442.1-2011;
——GB 18442-2001.
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, handling accessories, supports, pressure build coils, vaporizers, etc.
Note 1: the tank is defined as follows:
a) the beveled end surface of the first pass of circumferential welded joint between the tank and the external pipeline, the first threaded joint end surface for thread connection and the first flange sealing surface for flange connection;
b) the end cover and its fasteners of the tank opening part;
c) the connection weld between the tank and the non-pressure elements.
Note 2: the pipeline includes all pipes and fittings on cryogenic vessels that may be in contact with the contents.
Note 3: the main pressure elements include the cylinder and seal head of inner vessel as well as the pipe base, flange, manhole cylinder, manhole seal head, etc. in contact with the contents.
This part is applicable to cryogenic vessels that simultaneously meet the following conditions:
a) cryogenic vessel with the working pressure of inner vessel not less than 0.1MPa;
b) cryogenic vessel with the geometric volume not less than 1m3;
c) cryogenic vessel with the insulation mode of vacuum powder insulation, vacuum composite insulation or high vacuum multilayer insulation;
d) cryogenic vessel storing refrigerated liquefied gas contents with standard boiling point not lower than -196℃;
This part is not applicable to cryogenic vessels that meet the following conditions:
a) cryogenic vessel with the inner vessel and outer jacket made of non-ferrous metal or non-metallic materials;
b) cryogenic vessel with spherical structure;
c) cryogenic vessel with stacked insulation;
d) transportable cryogenic vessel;
e) cryogenic vessel storing refrigerated liquefied gas contents with standard boiling point lower than -196℃;
f) cryogenic vessel storing toxic gas as specified in GB 12268;
g) cryogenic vessel with special requirements such as national defense military equipment.
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 18442.2 Static vacuum insulated cryogenic pressure vessels - Part 2: Materials
GB/T 18442.3 Static vacuum insulated cryogenic pressure vessels - Part 3: Design
GB/T 18442.4 Static vacuum insulated cryogenic pressure vessels - Part 4: Fabrication
GB/T 18442.5 Static vacuum insulated cryogenic pressure vessels - Part 5: Inspection and testing
GB/T 18442.6 Static vacuum insulated cryogenic pressure vessels - Part 6: Safety protection
GB/T 18442.7 Static vacuum insulated cryogenic pressure vessels - Part 7: Rules of pressure strengthening for inner vessels
GB/T 26929 Terminology for pressure vessels
TSG 21 Supervision regulation on safety technology for stationary pressure vessel
TSG 07 Regulation for production and filling licensing of special equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions specified in GB/T 150 and GB/T 26929 as well as the following apply.
3.1
annular space
enclosed space formed between the inner vessel and the outer jacket
3.2
tank
pressure vessel consisting of inner vessel, outer jacket, insulation layer, etc.
3.3
inner vessel
inner cylinder for storing refrigerated liquefied gas and being able to withstand working pressure
3.4
outer jacket
sealed vessel that forms a vacuum insulated space and provides relevant protection
3.5
refrigerated liquefied gas
gas which is partially in liquid state due to low temperature during storage, the critical temperature of which is generally not higher than -50℃
3.6
vacuum insulated cryogenic pressure vessel
pressure vessel consisting of a liquid inner vessel and a outer jacket for maintaining a vacuum insulated space, and equipped with a complete set of safety accessories, instrument devices and a system meeting the operation requirements, for a purpose of storing refrigerated liquefied gas
3.7
high vacuum multilayer insulation
mode of insulation by highly vacuuming the annular space of the tank filled with multiple layers of alternately arranged interval insulants and reflecting screens
3.8
vacuum powder insulation
mode of insulation by vacuuming the annular space of the tank filled with porous particle insulation materials
3.9
vacuum composite insulation
mode of insulation by highly vacuuming the annular space filled with high vacuum multilayer insulation materials and partially filled with ultra-fine glass fiber insulation materials
3.10
geometric volume
internal volume of the inner vessel determined according to the designed geometric dimension minus the volume occupied by the inner parts
3.11
pressure build coil
device for increasing the pressure of the inner vessel by retuning the refrigerated liquefied gas led from the inner vessel back after vaporization
4 General requirements
4.1 General
The materials, design, fabrication, inspection and testing, safety protection and pressure strengthening for inner vessels of cryogenic vessels shall not only meet the requirements of this part and GB/T 18442.2～GB/T 18442.7, but also comply with the requirements of relevant laws, regulations and safety technical specifications promulgated by the State.
4.2 Qualifications and responsibilities
4.2.1 Qualifications
The design unit and fabrication unit shall obtain the corresponding qualification certificates issued by the relevant competent authorities of the State according to the provisions of TSG 07 and TSG 21.
4.2.2 Responsibilities
4.2.2.1 Responsibilities of design entrusting party
The design entrusting party of the cryogenic vessels shall submit the design conditions of the cryogenic vessels to the design unit in writing. The design conditions shall at least include the following contents:
a) safety technical specifications and product standards to be followed in design and fabrication;
b) operating parameters (including working pressure, working temperature range, filling amount, nozzle load, etc.);
c) the using site and its natural conditions (including ambient temperature, seismic fortification intensity, basic wind pressure or wind speed, basic snow pressure, etc.);
d) filling contents, including No., name, category, composition, physical and chemical properties, hazardous characteristics, harmful substance content and the corrosion rate to tank materials thereof, etc.;
e) expected service life of cryogenic vessels and vacuum annular space;
f) geometric parameters and nozzle orientation;
g) other necessary conditions for design (e.g. tank material selection, structural type, mode of insulation, corrosion prevention, surface treatment, transportation and special requirements, etc.).
4.2.2.2 Responsibilities of design unit
4.2.2.2.1 The design unit shall complete the product design based on the risk assessment report and shall be responsible for the correctness and integrity of the design documents.
4.2.2.2.2 The approval of design documents and the management and use of special design seals shall meet the requirements of TSG 21.
4.2.2.2.3 The design unit shall preserve all design documents within the design service life of cryogenic vessels.
4.2.2.3 Responsibilities of fabrication unit
4.2.2.3.1 The fabrication unit shall establish a sound quality assurance system for pressure vessels and operate it effectively; the system shall meet the requirements of TSG 21.
4.2.2.3.2 The fabrication unit shall strictly implement relevant laws and regulations, safety technical specifications and technical standards, and fabricate cryogenic vessels according to the technical requirements of the design documents.
4.2.2.3.3 The fabrication unit shall formulate a perfect quality plan (inspection plan) before the fabrication of cryogenic vessels, which shall meet the requirements of TSG 21 and GB/T 150.1.
4.2.2.3.4 The inspection department of the fabrication unit shall carry out all inspections and tests according to the requirements of this part, design drawings, design documents and quality plans during and after the fabrication, provide corresponding reports and be responsible for the report accuracy and integrity.
4.2.2.3.5 The fabrication unit shall provide the ex-factory document and completion document of the product to the user as required by TSG 21.
4.2.2.3.6 The fabrication unit shall install a product nameplate on the obvious part of the cryogenic vessel according to the requirements of TSG 21.
4.2.2.3.7 The fabrication unit shall invite the special equipment supervision and inspection organization to supervise and inspect the fabrication process of cryogenic vessels and obtain the "certificate for fabrication supervision and inspection of special equipment".
4.2.2.3.8 The fabrication unit shall carry out type test according to the requirements of GB/T 18442.5. Low temperature performance type test shall be conducted by the type test organization approved by the relevant competent authority of the State, which shall be responsible for issuing the report and certificate for low temperature performance type test.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
Bibliography
