GB/T 18442.4-2011 English PDF (GBT18442.4-2011)

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GB/T 18442.4-2011: Static vacuum insulated cryogenic pressure vessel -- Part 4: Fabrication
GB/T 18442.4-2011
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.40
J 76
Partially replacing GB 18442-2001
Static Vacuum Insulated Cryogenic Pressure Vessel -
Part 4. Fabrication
ISSUED ON. NOVEMBER 21, 2011
IMPLEMENTED ON. MAY 1, 2012
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine (AQSIQ);
Standardization Administration (SAC) of the People's
Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 6
4 General Requirements ... 7
5 Material Preparation ... 8
6 Cold and Hot Forming ... 9
7 Fabrication Requirements ... 10
8 Welding ... 15
9 Product Weld Test Plate ... 19
10 Cleaning and Assembling ... 20
11 Helium Mass Spectrum Leak Detection ... 21
12 Pipeline Fabrication and Installation of Safety Accessories ... 21
13 Non-destructive Testing ... 23
14 Coating and Appearance Quality ... 25
15 Mark and Sign ... 26
16 Delivery Documents ... 27
17 Delivery Conditions ... 28
Foreword
"Static Vacuum Insulated Cryogenic Pressure Vessel" (GB/T 18442) comprises 6 parts.
- Part 1. General Requirements;
- Part 2. Material;
- Part 3. Design;
- Part 4. Fabrication;
- Part 5. Inspection and Test;
- Part 6. Safety Device Requirements.
This part is Part 4 of GB/T 18442.
This part refers to "Cryogenic Vessels - Static Vacuum-insulated Vessels Part 1.
Design, Fabrication, Inspection and Tests" (ISO 21009-1.2008) (English edition).
This Part replaces "Fabrication requirements" (Section 6.6), "Inspection certificate"
(Chapter 9) and partial contents in "Cryo-insulation Pressure Vessels" (GB 18442-
2001).
Compared with GB 18442-2001, changes in this part are as follows.
- General requirements (requirements on key points for quality control, material
preparation, cold and hot forming, dimension and geometric tolerance), and
requirements on pipeline fabrication, non-destructive testing, cleaning and
delivery condition were added;
- Requirements on welding technology were refined;
- Welded structure (Informative) was cancelled.
This Part was proposed and is under the jurisdiction of National Technical Committee
on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC
262).
Drafting organizations of this part. China International Marine Containers (Group) Co.,
Ltd., Shanghai Gas Industry Association, Aerosun Corporation, China Special
Equipment Inspection and Research Institute, Shanghai Huayi Group Equipment
Static Vacuum Insulated Cryogenic Pressure Vessel -
Part 4. Fabrication
1 Scope
1.1 This part specifies the basic fabrication requirements of Static Vacuum Insulated
Cryogenic Pressure Vessel (hereinafter referred to as "cryogenic vessel").
1.2 The application scope in this part is the same as that in part 1 of this standard.
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 amendment) applies.
GB 150 Steel Pressure Vessels
GB/T 1804-2000 General Tolerances - Tolerances for Linear and Angular
Dimensions without Individual Tolerance Indications
GB/T 9969 General Principles for Preparation of Instructions for Use of Industrial
Products
GB/T 18442.1-2011 Static Vacuum Insulated Cryogenic Pressure Vessel Part 1.
General Requirements
GB/T 18442.2 Static Vacuum Insulated Cryogenic Pressure Vessel - Part 2. Material
GB/T 18442.3 Static Vacuum Insulated Cryogenic Pressure Vessel - Part 3. Design
GB/T 25198 Heads for Pressure Vessels
JB/T 4711 Coating and Packing for Pressure Vessels Transport
JB/T 4730.1 Nondestructive Testing of Pressure Equipment - Part 1. General
Requirements
JB/T 4730.2 Nondestructive Testing of Pressure Equipment - Part 2. Radiographic
Safety accessories
It is a generic term for accessories that act as safety protection such as safety valve,
bursting disc device and safety relief device combined by safety valve and bursting
disc, emergency shutoff device, liquid level meter, pressure gauge, static conducting
device, explosive device of outer shell, flame arrester.
4 General Requirements
4.1 The fabrication, inspection and acceptance of tanks shall meet not only the
requirements of this standard, but also those specified in the design drawing.
4.2 The fabrication organization shall develop quality certificate system for pressure
vessels according to relevant laws and regulations, so as to guarantee product quality
and safety.
4.3 Personnel with "the special equipment operation personnel certificate" of
corresponding project shall undertake the welding.
4.4 Personnel with "the special equipment inspection and testing personnel
certificate" of corresponding project shall undertake the non-destructive testing.
4.5 Fabrication organization shall be possessed of building facilities, service
environment, vacuum equipment, helium mass spectrometer leak detector, necessary
cleaning equipment and testing instrument corresponding with vacuum insulation.
4.6 Welded joints between pressure units of vessel are divided into A, B, C and D
four categories, connection joint between non-pressure unit and pressure unit is
Category E weld joint which is as shown in Figure 1.
a) Category A weld joints. longitudinal joint of cylinder, girth joint for connection
between spherical head and cylinder, tailor welded joint in convex heads and
built-in connection pipe or joint for butt joint between flange and shell.
b) Class B welded joints include the girth joints of shell, girth joint for butt joint
between the long-neck flange or connection pipe and the connection pipe,
excluding those having been classified as Category A;
c) The non-butt joints for connection between flange and connection pipe all belong
to Category C welded joints;
d) Category D welded joints include joints for connection between connection pipe,
manhole, flange, reinforcement panel and shell; however, those having been
5.4 The sharp scars as well as such defects as partial scars and notches on the
stainless steel surface shall be grinded, and the inclination of the grinding scope shall
be 1.3 at most. The grinding depth shall hall be less than or equal to 5% of the
thickness δs of steels at this position, and less than or equal to 2mm, otherwise repair
welding shall be carried out.
6 Cold and Hot Forming
6.1 Plates for fabrication of cylinder and head may be processed to the required
shape by cold and hot forming method.
6.2 For cold formed austenitic stainless steel, percentage elongation after fracture of
its base material is not less than 30%, or heat treatment may not be carried out where
cold machining deformation rate is less than or equal to 15%.
6.3 Calculation for machining deformation rate of steel plates
Uniaxial tension (such as round rolling of steel plates)
%R
R-R


 
Biaxial tension (such as cold pressed head)
%R
R-R
51 

 
Where,
ε - Deformation rate of steel plates, %;
δ - Nominal thickness of steel plates, mm;
Rf - Center radius of steel plates after bending, mm;
R0 - Center radius of steel plates before bending, and for flat plate, R0 is infinite, mm.
6.4 Where austenitic stainless steel with hot forming or cold ...