NB/T 47058-2017 English PDF (NB/T47058-2017)

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NB/T 47058-2017: Road tankers for refrigerated liquefied gas
NB/T 47058-2017
NB
ENERGY INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.160
T 58
Replacing JB/T 4783-2007
Road tankers for refrigerated liquefied gas
ISSUED ON: NOVEMBER 15, 2017
IMPLEMENTED ON: MARCH 01, 2018
Issued by: National Energy Administration
Table of Contents
Foreword ... 4
1 Scope ... 7
2 Normative references ... 8
3 Terms and definitions ... 11
4 Qualification and responsibilities ... 13
5 Materials ... 15
6 Design ... 22
7 Safety accessories, instruments and loading-unloading accessories ... 44
8 Manufacturing ... 53
9 Test methods ... 74
10 Inspection rules ... 79
11 Marks, logos ... 82
12 Exit-factory documents ... 82
13 Storage, transportation ... 84
Annex A (normative) Declaration of conformity to the standard and amendments ... 86
Annex B (normative) Risk assessment report ... 88
Annex C (normative) Calculation of the safe discharge capacity of the tank and the
discharge capacity of the overpressure relief device ... 90
Bibliography ... 104
Road tankers for refrigerated liquefied gas
1 Scope
1.1 This Standard specifies the requirements for materials, design, manufacture, test
methods, inspection rules, signs and marks, exit-factory documents, storage and
transportation for road tankers for refrigerated liquefied gas (hereinafter referred to as
tankers).
1.2 This Standard is applicable to the tanker of which the design pressure of the
container in the tank is not less than 0.1 MPa, the geometric volume is not less than 1
m3, the vacuum powder insulation or high vacuum multi-layer insulation structure is
adopted, and the tank is permanently connected to the finalized chassis or semi-trailer
running mechanism.
1.3 This Standard does not apply to tankers in the following ranges:
a) The material of the tank is non-ferrous metal or non-metal;
b) Tankers filled with refrigerated liquefied gas medium with standard boiling point
lower than -196°C;
c) Tankers filled with toxic medium;
d) Tankers with special requirements for national defense and military equipment.
1.4 Defined scope
1.4.1 The scope of tankers to which this Standard applies includes tank bodies, pipelines,
safety accessories, instruments, loading-unloading accessories, and finalized chassis or
semi-trailer running gears, supports, operation boxes, self-superchargers, etc.
1.4.2 The scope of tankers is defined as follows:
a) The beveled end face of the first circumferential joint of the welded connection
between the tank and the pipeline;
b) The first threaded joint end face of the tank and the pipeline and safety accessories
threaded connection, and the first flange sealing surface of the flange connection;
c) The end cover of the opening part of the tank and its fasteners;
d) The connection welds between the tank and non-pressure components.
1.4.3 Pipeline includes all pipes and fittings connected to the tank.
geometric volume of the inner container.
3.11 specified filling rate
When the tanker is filled, the ratio of the liquid volume to the geometric volume of the
inner container when the filling liquid reaches the maximum liquid level specified in
the design.
3.12 reference steel
A benchmark steel of which the set lower limit of the standard tensile strength (Rm) is
370 MPa, and the elongation after break (A) is 27%.
3.13 sealing-off vacuum degree
The vacuum degree when the vacuum interlayer pressure is relatively stable at room
temperature after the tank is vacuumed and sealed.
4 Qualification and responsibilities
4.1 Qualification
4.1.1 The design, manufacture, inspection and acceptance of tankers shall not only
comply with the provisions of this Standard, but also comply with the relevant laws,
regulations and safety technical specifications promulgated by the state.
4.1.2 The designer and manufacturer of tankers shall obtain the corresponding special
equipment design and manufacture license according to the provisions of TSG R0005.
4.1.3 In addition to holding the corresponding special equipment manufacturing license,
the manufacturer of tankers shall also obtain the corresponding product manufacturing
qualification in accordance with the regulations of the competent department of the
automobile industry under the State Council.
4.2 Responsibilities
4.2.1 User or design client
The user or the design client shall submit the tanker design conditions to the design unit
in formal written form. Design conditions include at least the following:
a) Main standards and safety technical specifications that shall be followed in design
and manufacture.
b) Working conditions, including ambient temperature, working temperature range,
working pressure range, loading-unloading conditions and methods, loading-
unloading pressure, additional load, road conditions, etc.;
c) Filling medium, including the number, name, category, composition, physical and
chemical properties, hazardous characteristics, harmful impurity content of the
medium, and the corrosion rate of the medium to the tank material, etc.;
d) Geometric volume or effective volume of the inner packaging;
e) Expected tanker age and sandwich vacuum age;
f) Required maintenance time;
g) Number of pressure cycles corresponding to fluctuating pressure;
h) Model and necessary technical parameters of the finalized chassis or tractor;
i) Other necessary conditions required for design (such as tank material selection,
anti-corrosion, surface treatment and special tests, etc.).
4.2.2 Designer
4.2.2.1 The designer shall complete the vehicle design based on the contents of the risk
assessment report, and shall be responsible for the correctness and completeness of the
design documents.
4.2.2.2 The management and use of the special seal for design shall meet the
requirements of TSG R0005.
4.2.2.3 The designer shall keep all the design documents within the design service life
of the tanker.
4.2.3 Manufacturer
4.2.3.1 The tanker shall be manufactured as the whole vehicle. The manufacturer is
responsible for the manufacturing quality of the tanker.
4.2.3.2 The manufacturer shall manufacture according to the requirements of the design
documents. When the original design document needs to be modified, it shall obtain the
written certification document agreeing to the modification from the original designer,
and make detailed records of the modified parts.
4.2.3.3 The manufacturer shall formulate a quality plan before manufacturing. Its
content includes at least the tanker manufacturing process control points, inspection
items and qualification requirements.
4.2.3.4 During the manufacturing process and after completion, the inspection
department of the manufacturer shall conduct various inspections and tests in
accordance with the provisions of this Standard, design drawings and design documents,
and quality plans, issue corresponding reports, and be responsible for the correctness
and completeness of the reports.
tanker manufacturer. The content of the material quality certificate shall be complete
and clear. And print traceable information signs and quality inspection stamps.
5.1.6 When the manufacturer obtains tank materials from non-material manufacturers,
it shall obtain the original material quality certificate provided by the material
manufacturer or a copy stamped with the official seal of the material operator and the
seal of the person in charge.
5.1.7 The manufacturer shall be responsible for the authenticity and consistency of the
quality certificates of the obtained materials and purchased parts.
5.2 Tank material
5.2.1 The material selected for the tank shall comply with the provisions of GB/T 150.2
and the corresponding national standards and industry standards. When selecting
materials for tank pressure components, the use conditions of materials (such as design
temperature, design pressure, medium characteristics and operating characteristics,
etc.), material properties (mechanical properties, process properties, chemical
properties and physical properties), tank manufacturing process and economic
rationality shall be considered.
5.2.2 The use of foreign brand materials or new materials shall comply with the relevant
regulations of TSG R0005.
5.2.3 Inner container
5.2.3.1 The material of the pressure components of the inner container shall comply
with the relevant material standards and design drawings.
5.2.3.2 The steel used for the pressure components of the inner container shall generally
be made of austenitic stainless-steel.
5.2.3.3 The mechanical properties of materials used for inner containers shall meet the
following requirements:
a) The steel used for the pressure components of the inner container shall have good
plasticity. The standard value of yield strength (or 0.2% of the specified plastic
elongation strength) at room temperature shall not be greater than 460 MPa. The
upper limit standard value of tensile strength shall not be greater than 725 MPa.
b) The ratio of room temperature yield strength (or 0.2% specified plastic elongation
strength) to room temperature tensile strength in the material quality certificate
shall not be greater than 0.85.
c) The elongation after fracture of the steel plate shall not be less than 10000/Rm (%).
The elongation after fracture of the austenitic stainless-steel shall not be less than
40%. The elongation index after fracture of specimens of different sizes shall be
converted according to GB/T 17600. The converted indicators shall comply with
the provisions of this article.
5.2.4 Shell
5.2.4.1 Smelting method
5.2.4.1.1 The steel used for the shell shall be killed steel.
5.2.4.1.2 The low-temperature steel plates and low-temperature steel forgings whose
design temperature is below -20°C shall also adopt the external refining process.
5.2.4.2 Chemical composition (melting analysis)
5.2.4.2.1 For low-alloy steel materials used for welding, the carbon content is not
greater than 0.250%, the phosphorus content is not greater than 0.035%, and the sulfur
content is not greater than 0.035%.
5.2.4.2.2 For low-alloy steel products (steel plates and steel forgings), the phosphorus
and sulfur content shall meet the following requirements:
a) The phosphorus content is not more than 0.030%. The sulfur content is not more
than 0.020%.
b) For steel with a design temperature lower than -20°C and the lower limit of the
standard tensile strength not greater than 540MPa, the phosphorus content is not
greater than 0.025%, and the sulfur content is not greater than 0.012%.
5.2.4.3 Mechanical properties
5.2.4.3.1 For the low-alloy steel used for the shell, the standard value of the yield
strength at room temperature shall not exceed 460 MPa, and the standard value of the
upper limit of the tensile strength shall not exceed 725 MPa. It shall be able to adapt to
the environmental conditions encountered by the tanker during transportation and use.
It shall meet the requirements of the design drawings.
5.2.4.3.2 For the low-alloy steel used for the shell, the ratio of the yield strength to the
tensile strength at room temperature in the material quality certificate shall not be
greater than 0.85.
5.2.4.3.3 The impact test of low-alloy steel plates and steel forgings for shells shall meet
the following requirements:
a) The impact test temperature shall be in accordance with the requirements of the
design documents.
b) The minimum value of the Charpy impact absorbed energy (KV2) of the V-notch
specimen shall meet the requirements in Table 1.
c) When the impact absorption energy index in the steel standard is higher than that
5.2.6.1 Stainless-steel forgings for inner containers shall meet the requirements of NB/T
47010. The level of forgings shall not be lower than Level III.
5.2.6.2 The low-alloy steel forgings and stainless-steel forgings for shells shall comply
with the regulations in NB/T 47009 and NB/T 47010, respectively. The level of forgings
in contact with the medium in the tank shall not be lower than level III. The levels of
other forgings are not to be lower than Level II.
5.2.7 Steel pipes and fittings
5.2.7.1 The materials used for steel pipes shall comply with the provisions of GB/T
150.2 and design drawings, and shall comply with the provisions of GB/T 13296 or
GB/T 14976.
5.2.7.2 Pipe fittings shall comply with the relevant standards. When steel forgings are
used for pipe fittings, they shall comply with the provisions in 5.2.6.
5.2.7.3 When the pipe fittings are formed by cold forming, the measured value of ferrite
after forming shall not exceed 15%.
5.2.8 Thermal insulation material
5.2.8.1 Expanded perlite (pearlite) for vacuum powder insulation shall meet the
following requirements:
a) Particle size: 0.1 mm ~ 1.2 mm.
b) Bulk density: 30 kg/m3 ~ 60 kg/m3.
c) Moisture content: not more than 0.3% (mass ratio).
d) Thermal conductivity (average value at normal pressure and temperature 77 K ~
310 K): no more than 0.03 W/ (m · K).
5.2.8.2 The light blocking agent shall have good chemical stability.
5.2.8.3 The high-vacuum multi-layer heat insulation material shall comply with the
provisions of GB/T 31480. It shall be made of degreased fiber cloth or degreased fiber
paper with small thermal conductivity and low outgassing rate.
5.2.9 Adsorbent materials
5.2.9.1 SA Molecular sieves shall meet the requirements of GB/T 13550. 13X molecular
sieve shall meet the requirements of HG/T 2690.
5.2.9.2 The oxidized handle shall comply with the provisions of YS/T 599.
5.2.10 Welding consumables
5.2.10.1 The welding consumables used for the tank shall meet the requirements of
NB/T 47018.1 ~ 47018.4. There are clear and firm signs.
5.2.10.2 The selection of welding materials shall consider the matching of the
mechanical properties of the welded joints and the base metal of the tank. The tensile
strength of the weld metal shall not be lower than the lower limit specified in the base
metal standard. The impact absorbed energy of low-alloy ...