GB/T 26978-2021 English PDF (GBT26978-2021)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB/T 26978-2021
Historical versions: GB/T 26978-2021
Preview True-PDF (Reload/Scroll if blank)

GB/T 26978-2021: Design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of cryogenic liquefied gas
GB/T 26978-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 75.060
CCS E 24
Replacing GB/T 26978.1-2011, GB/T 26978.2-2011, GB/T 26978.3-2011,
GB/T 26978.4-2011, GB/T 26978.5-2011
Design and Manufacture of Site Built, Vertical, Cylindrical,
Flat-bottomed Steel Tanks for the Storage of Cryogenic
Liquefied Gas
ISSUED ON: DECEMBER 31, 2021
IMPLEMENTED ON: JULY 1, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 4
Introduction ... 9
1 Scope ... 10
2 Normative References ... 10
3 Terms, Definitions, Symbols and Abbreviations ... 13
3.1 Terms and Definitions ... 13
3.2 Symbols ... 18
3.3 Abbreviations ... 22
4 Basic Stipulations and General Rules ... 24
4.1 Types of Storage Tank ... 24
4.2 Overall Design Basis ... 29
4.3 Protection System ... 35
4.4 Actions ... 37
4.5 Inspection and Maintenance ... 39
4.6 Quality Management, Environmental Management and Occupational Health and
Safety Management ... 39
5 Metal Components ... 40
5.1 General Requirements ... 40
5.2 Materials ... 40
5.3 Design ... 44
5.4 Manufacture ... 67
5.5 Welding Process ... 88
5.6 Welding ... 91
5.7 Inspection ... 93
5.8 Air Pressure Lift ... 100
6 Concrete Components ... 101
6.1 Materials ... 101
6.2 Load Combinations ... 102
6.3 Design Requirements ... 102
6.4 Construction Requirements ... 104
6.5 Lining ... 104
7 Thermal Insulation Components ... 105
7.1 Overview ... 105
7.2 Design, Performance, Testing and Selection of Thermal Insulation Materials ... 105
7.3 Thermal Protection - Vapor Barrier... 110
7.4 Design of Adiabatic System ... 111
7.5 Installation of Adiabatic system ... 119
8 Tests, Drying, Replacement and Cooling ... 121
8.1 Hydrostatic Test and Pneumatic Test ... 121
8.2 Drying, Replacement and Cooling ... 126
8.3 Shutdown ... 127
Appendix A (informative) An Example of the Design of Central Reinforcement Ring
... 129
Appendix B (informative) Loads on the Membrane ... 132
Appendix C (informative) Thermal Insulation Materials ... 133
Appendix D (informative) Test Methods for Thermal Insulation Materials ... 135
Appendix E (informative) Acceptance Inspection of Main Thermal Insulation Materials
... 138
E.1 Pressure-bearing Cellular Glass Bricks of the Tank Bottom ... 138
E.2 Expanded Perlite ... 142
E.3 Glass Wool ... 145
E.4 Elastic Felt ... 145
E.5 Asphalt Felt ... 146
Appendix F (informative) Thermal Insulation of the Bottom of Primary Storage Tank -
-- Limit States Theory ... 147
Appendix G (informative) Construction and Installation of Adiabatic System of Storage
Tank ... 149
G.1 Thermal Insulation Installation of Tank Bottom ... 149
G.2 Thermal Insulation Installation of Annular Space ... 149
G.3 Thermal Insulation Installation of Suspended Deck ... 150
G.4 Thermal Insulation Installation of Cryogenic Pipelines in Tank Headspace ... 151
Bibliography ... 152
Design and Manufacture of Site Built, Vertical, Cylindrical,
Flat-bottomed Steel Tanks for the Storage of Cryogenic
Liquefied Gas
1 Scope
This document specifies the general requirements for the design, manufacture and installation
of site built, above-ground vertical cylindrical flat-bottomed steel primary container storage
tanks (including metal components, concrete components and thermal insulation components,
etc.), and describes the procedures and methods for the tests, drying, replacement and cooling
of the storage tanks.
This document is applicable to the storage of cryogenic liquefied gas with a temperature range
of 165 C ~ 0 C, including cryogenic refrigerated hydrocarbons, such as: liquefied natural
gas (LNG) and cryogenic liquefied petroleum gas (LPG), etc., whose main components are:
methane, ethane, propane, butane, ethylene and propylene, etc.
This document is applicable to storage tanks whose maximum design pressure is not greater
than 50 kPa.
This document does not apply to storage tanks whose primary container is concrete.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 150.2-2011 Pressure Vessels - Part 2: Materials
GB/T 150.3 Pressure Vessels - Part 3: Design
GB/T 193 General Purpose Metric Screw Threads - General Plan
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 709-2019 Dimension, Shape, Weight and Tolerance for Hot-rolled Steel Strip, Plate and
Sheet
GB/T 985.1 Recommended Joint Preparation for Gas Welding, Manual Metal Arc Welding,
Gas-shield Arc Welding and Beam Welding
esi: thickness of each circle of shell plate arranged in sequence, expressed in (mm);
est: thickness of the uppermost shell plate, expressed in (mm);
es,t: calculated thickness of shell plate under the hydraulic test conditions, expressed in (mm);
es,1: thickness of bottom ring shell plate, expressed in (mm);
F: acting force, expressed in (N);
fPLDF: allowable load factor for load-bearing thermally insulating materials prone to creepage;
H: highest design liquid level, expressed in (m);
He: equivalent stable height when the thickness of each circle of shell plate is est, expressed in
(m);
Hh: calculated height between the bottom of shell plate and the maximum design liquid level,
expressed in (m);
Hp: maximum permissible distance between reinforcing supports on the shell with the minimum
thickness, expressed in (m);
Ht: calculated height between the bottom of shell plate and the test liquid level, expressed in
(m);
hs: height of each circle of shell plate, expressed in (m);
K: calculated reinforcement ring coefficient;
k: S-N curve coefficient;
L: single allowable minimum value of compressive strength;
Lr: effective roof length, expressed in (mm);
Ls: effective shell length, expressed in (mm);
la: minimum width between the edge of the irregular plate on the outer ring of the tank bottom
and the inner side of the shell plate, expressed in (mm);
m: average value of all test data of fatigue test;
nj: number of longitudinal welded joints of the shell plate in the first circle;
ns: sample size of the sampling batch;
P: design pressure (for the top open inner tank, the design pressure is 0), expressed in (kPa);
Pe: external load, expressed in (kPa);
Pi: internal pressure, which is the sum of internal air pressure and adiabatic system pressure,
expressed in (kPa);
PLD: allowable load for load-bearing thermally insulating materials prone to creepage,
expressed in (MPa);
Pr: internal pressure minus the weight of the top plate, expressed in (kPa);
Pt: hydrostatic test pressure (for the top open inner tank, the design pressure is 0), expressed in
(kPa);
Q: quality statistics of acceptance sampling inspection;
Qe: quality statistics of compressive strength of the sampling batch;
Qt: quality statistics of thermal conductivity of the sampling batch;
R: characteristic strength value of thermal insulation materials, expressed in (MPa);
Rb: radius of the assembly circle inside the first circle of shell plate, expressed i...