NB/T 47059-2017 English PDF (NB/T47059-2017)

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NB/T 47059-2017: Tank containers for refrigerated liquefied gas
NB/T 47059-2017
NB
ENERGY INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.01
J 74
Replacing JB/T 4784-2007
Tank containers for refrigerated liquefied gas
冷冻液化气体罐式集装箱
ISSUED ON: NOVEMBER 15, 2017
IMPLEMENTED ON: MARCH 1, 2018
Issued by: National Energy Administration
Table of Contents
Foreword ... 5
1 Scope ... 8
2 Normative references ... 9
3 Terms and definitions ... 11
4 Qualifications and responsibilities ... 12
5 Materials ... 14
6 Design ... 21
7 Safety accessories, instruments and filling/discharging accessories ... 44
8 Fabrication ... 53
9 Test methods ... 72
10 Inspection rules ... 78
11 Marking and identification ... 80
12 Delivery documents ... 81
13 Storage and transportation ... 82
Annex A (Normative) Declaration of conformity and revision of the standard ... 84
Annex B (Normative) Risk assessment report ... 85
Annex C (Normative) Calculation of safe relief capacity of tank and discharge capacity
of overpressure relief device ... 87
Bibliography ... 101
Tank containers for refrigerated liquefied gas
1 Scope
1.1 This standard specifies the requirements for materials, design, fabrication, test methods,
inspection rules, marking and identification, ex-factory documents, storage and transportation of
tank containers for refrigerated liquefied gas (hereinafter referred to as tank containers).
1.2 This standard is applicable to tank containers of which the design pressure of the tank inner
vessel is not less than 0.1MPa, the geometric volume is not less than 1m3, the vacuum powder
insulation or high vacuum multilayer insulation structure is adopted, and the tank and the framework
are permanently connected.
1.3 This standard is not applicable to the following tank containers:
a) tank container made of non-ferrous metal or non-metallic materials;
b) tank container filled with refrigerated liquefied gas contents with standard boiling point lower
than -196℃;
c) tank container filled with toxic contents;
d) tank container with special requirements such as national defense military equipment.
1.4 Definition of scope
1.4.1 Tank containers applicable to this standard include tank, pipeline, safety accessories,
instruments, filling and discharging accessories, pressure build coils, frameworks, supports,
operation boxes, etc.
1.4.2 The tank is defined as follows:
a) the beveled end surface of the first circumferential joint of welded connection;
b) the first threaded joint end surface of the threaded joint between the tank and the external
pipeline or safety accessories; the first flange sealing surface of flange connection;
c) the end cover and its fasteners of the tank opening part;
d) the connection weld between the tank and the non-pressure elements.
5.1.1 The mechanical, physical and processing properties and the compatibility with contents shall
be considered for the selection of materials.
5.1.2 For the material that may be exposed to oxygen or oxygen-enriched environment, its
compatibility with oxygen shall meet the requirements of GB/T 31481.
5.1.3 Materials for non-pressure elements welded with pressure elements shall have good
toughness and weldability, and shall be matched with the welded pressure elements.
5.1.4 The material fabrication unit shall make clear and firm factory steel impression mark or
adopt other traceable mark on the obvious position of the material.
5.1.5 The material fabrication unit shall provide the tank container fabrication unit with the
material quality certificate which shall be complete, clear and printed with traceable information
mark and stamped with the quality inspection seal.
5.1.6 When obtaining tank materials from a unit other than the material fabrication unit, the
original material quality certificate provided by the material fabrication unit or the copy stamped
with official seal of material operation unit and the seal of the responsible person shall be obtained.
5.1.7 The fabrication unit shall be responsible for the authenticity and consistency of the obtained
quality certificates of the materials and purchased parts used for tank.
5.2 Tank materials
5.2.1 The materials selected for the tank shall comply with GB/T 150.2 and relevant national or
professional standards. For selection of materials for pressure elements of tank, the service
conditions (e.g. design temperature, design pressure, content characteristics and operating
characteristics), material properties (mechanical, process, chemical and physical properties), tank
fabrication process and economic rationality shall be considered.
5.2.2 The use of materials with foreign designations and new materials shall meet the relevant
requirements of TSG R0005.
5.2.3 Inner vessels
5.2.3.1 The materials for pressure elements of inner vessels shall comply with the requirements
of corresponding material standards and design drawings.
5.2.3.2 Austenitic stainless steel shall be generally adopted for pressure elements of inner vessels.
5.2.3.3 The mechanical properties of materials used for inner vessels shall meet the following
requirements:
a) the steel for pressure elements of inner vessels shall have good plasticity, for which, the
standard yield strength (or 0.2% specified plastic elongation strength) at normal temperature
shall not be greater than 460MPa, the upper limit of standard tensile strength shall not be
greater than 725MPa;
b) the ratio of yield strength (or 0.2% specified plastic elongation strength) at room temperature
to tensile strength at room temperature, as indicated in the material quality certificate, shall
not be greater than 0.85;
c) the elongation after fracture of the steel plate is not less than 10,000/Rm (%), and that of the
austenitic stainless steel shall not be less than 40%. The index for elongation after fracture of
samples of different dimensions shall be converted according to GB/T 17600, and the
converted index shall meet the requirements of this subclause.
5.2.4 Outer jacket
5.2.4.1 Melting method
5.2.4.1.1 Killed steel shall be adopted for the outer jacket.
5.2.4.1.2 For low-temperature steel plates and forgings with design temperature lower than -20℃,
the refining process outside the furnace shall also be adopted.
5.2.4.2 Chemical compositions (melting analysis)
5.2.4.2.1 For low-alloy steel used for welding, the carbon content shall be not greater than 0.250%,
the phosphorus content not greater than 0.035% while the sulfur content not greater than 0.035%.
5.2.4.2.2 For low-alloy steel (steel plates and forgings), the phosphorus or sulfur content shall
meet the following requirements:
a) the phosphorus content is not greater than 0.030%, while the sulfur content is not greater than
0.020%;
b) for steel with design temperature lower than -20℃ and the lower limit of standard tensile
strength not greater than 540MPa, the phosphorus content is not greater than 0.025% while
the sulfur content is not greater than 0.012%.
5.2.4.3 Mechanical properties
5.2.4.3.1 For low-alloy steel used for outer jacket, the standard yield strength at normal
temperature shall not be greater than 460MPa, and the upper limit of standard tensile strength shall
not be greater than 725MPa; such materials shall be able to adapt to the environmental conditions
encountered in the transportation and use of tank containers and meet the requirements of design
d) heat conductivity coefficient (average at atmospheric pressure and temperature of 77K ~
310K):...