GB/T 18442.2-2011 English PDF (GBT18442.2-2011)

This part specifies the basic requirements of the material of static vacuum insulated cryogenic pressure vessel. The application scope in this part is the same as that in Part 1 of this standard.

GB/T 18442.2-2011
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 2. Material
ISSUED ON. NOVEMBER 21, 2011
IMPLEMENTED ON. MAY 1, 2012
Jointly 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 Purchased Part and Pipe Fitting ... 7
6 Tank Material ... 8
7 Insulated Material ... 9
8 Welding Material ... 10
9 Inner-supporting Material ... 10
10 Other Material ... 10
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 the second part 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 the "material requirements" and partial contents of Section 6.5 in "Cryo-insulation Pressure Vessels" (GB 18442- 2001).
Compared with GB 18442- 2001, changes in this part are as follows.
- The requirements for the purchased part and pipe fitting, welding and adsorbing material as well as inner-supporting material were added;
- The property index and quality control requirements for the tank material were added.
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) Ltd., Shanghai Gas Industry Association, Kaifeng Air Separation Group Co., Ltd., China Special Equipment Inspection and Research Institute, Shanghai Huayi Group Equipment Engineering Co., Ltd., Suzhou Huafu Cryogenic Vessel Co., Ltd., Zhangjiagang CIMC Sanctum Cryogenic Equipment Co., Ltd., Shanghai Jiaotong University.
Static Vacuum Insulated Cryogenic Pressure Vessel -
Part 2. Material
1 Scope
1.1 This part specifies the basic requirements of the material 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 713 Steel Plates for Boilers and Pressure Vessels
GB/T 1220 Stainless Steel Bars
GB/T 3198 Aluminium and Aluminium Alloys Foils
GB/T 3274 Hot-rolled Plates and Strips of Carbon Structural Steels and High Strength Low Alloy Structural Steels
GB/T 13550 Molecular Sieve 5A and Its Determination
GB/T 14976- 2002 Stainless Steel Seamless Tubes for Fluid Transport
GB/ T 16958 Biaxially Oriented Polyester Film for Package
GB/T 18442.1- 2011 Static Vacuum Insulated Cryogenic Pressure Vessel - Part 1. General Requirements;
GB 24511 Stainless Steel Plate, Sheet and Strip for Pressure Equipment
HG/T 2690 Molecular Sieve 13X
Including cylinder and head of the inner vessel as well as connection pipe and pipe flange with nominal diameter no less than 250mm.
4 General Requirements
4.1 The purchased part shall meet the requirements of the corresponding national standard and professional standard and be provided with product certificate. It may be used after passing the inspection.
4.2 As for the tank material selection, the service conditions (including design temperature, design pressure, medium characteristics and operating feature) and the properties (including mechanical property, chemical property, physical property and process property) of the material as well as the fabrication process and economic rationality of the vessel shall be taken into consideration.
4.3 For the tank material, its quality, specification and mark shall comply with the requirements of the corresponding material in the national standard or professional standard, and its application requirements shall comply with those specified in the quoted standard;
4.4 The fabrication organization shall investigate, evaluate and trace the material supplier so as to guarantee the pressure vessel material complies with those specified in this standard as well as the relevant standard. Where the material is transported to the factory, the material quality certificate and material mark shall be examined; and if the material is in accordance with the requirements of this standard, it may be used. 4.5 Where the material produced according to foreign standard is adopted, the pressure units of the tank shall meet the requirements of TSG R0004.
4.6 Specific requirements for the tank material shall be indicated in the design drawing or corresponding technical document if any.
5 Purchased Part and Pipe Fitting
5.1 Where joint, sealing pad and pipeline are possible to be in contact with the cryogenic liquid, their materials shall be compatible with the operating medium. 5.2 The stainless steel pipe shall in accordance with those specified in GB/T 14976 and the compatibility between material and medium shall be considered.
5.3 The pressure pipe units such as pipe fitting and valve shall comply with requirements of the corresponding materials in the national standard or professional 6.3.1 The steel plate for the outer shell shall be possessed of weldability. Where carbon steel plate and low alloy steel plate are selected, they shall comply with those specified in GB/T 3274 and GB 713 respectively; and the steel plate shall be provided with a clear and firm mark on its apparent position, at least including standard code, material designation and specification as well as heat (lot) No.
6.3.2 The low alloy steel and stainless steel forgings shall respectively comply with those specified in NB/T 47009 and NB/T 47010 with no less than Grade II forgings; and the stainless steel bar shall meet the requirements of GB/T 1220.
6.3.3 The reinspection of the carbon steel and low alloy steel plate shall meet the requirements of the design drawing.
7 Insulated Material
7.1 The expanded perlite (pearlite sand) for the vacuum powder insulation shall meet the following requirements.
a) Grain size. 0.1mm~1.2mm;
b) Bulk density. 30kg/m³~60kg/m³;
c) Moisture content. less than or equal to 0.3% of the mass ratio;
d) Heat conductivity coefficient (the mean at the temperature of 77K~310K under ordinary pressure). no greater than 0.03W/ (m·K).
7.2 Where the vacuum powder insulation is adopted, photoresist with favorable chemical stability may be added to the powder. For the tank used to store liquid oxygen, the flammable photoresist like aluminum powder is prohibited.
7.3 As for the tank used to store the medium with boiling point no greater than -182℃, the insulated material that is possible to generate hazardous reaction with oxygen or in rich oxygen atmosphere shall not be adopted. The insulated material in the insulation system shall be tested under the condition of oxygen content no less than 99.5% and 0.1MPa pressure by using scorching platinum spun gold to touch the sample; and the sample of non-sustaining combustion is regarded as qualified.
7.4 The aluminum foil for high vacuum multilayer insulation shall meet the requirements of GB/T 3198.
7.5 The base material of double-side aluminized mylar shall meet the requirements of GB/T 16958.