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NB/T 47059-2017 English PDF (NBT47059-2017)

NB/T 47059-2017 English PDF (NBT47059-2017)

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NB/T 47059-2017: Tank containers for refrigerated liquefied gas

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. 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.
NB/T 47059-2017
NB
ENERGY INDUSTRY STANDARD OF
THE PEOPLE REPUBLIC OF CHINA
ICS 23.020.01
J 74
Replacing JB/T 4784-2007
Tank containers for refrigerated liquefied gas
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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): not greater than 0.03W/(m??K).
5.2.8.2 The photoresist shall have a good chemical stability.
5.2.8.3 The high vacuum multilayer insulation material shall meet the requirements of GB/T 31480; the defatted fiber cloth or defatted fiber paper with small heat conductivity coefficient and low outgassing rate shall be adopted.
5.2.9 Adsorbent materials
5.2.9.1 The molecular sieve 5A shall meet the requirements of GB/T 13550 while the molecular sieve 13X shall meet the requirements of HG/T 2690.
5.2.9.2 The palladium oxide shall meet the requirements of YS/T 599.
5.2.10 Welding materials
5.2.10.1 The welding materials for tanks shall meet the requirements of NB/T 47018.1~47018.4, and be provided with legible and firm markings.
5.2.10.2 For the selection of welding materials, the match between the mechanical properties of the welded joint and the base metal of the tank shall be considered. The tensile strength of weld metal shall not be lower than the lower limit specified in the standard for parent metal, and the impact absorbed energy of low-alloy steel welding materials shall meet those specified in Table 1. When necessary, other properties shall not be lower than the corresponding requirements for the parent metal.
5.2.10.3 The welding materials shall be subjected to welding procedure qualification according to NB/T 47014, and may not be used unless passing the qualification.
5.2.11 Bracing materials for annular space
5.2.11.1 The materials with low heat conductivity coefficient, low surface outgassing rate in vacuum and good low-temperature impact toughness shall be adopted as nonmetallic bracing materials, and the operating temperature shall be within the allowable operating temperature range of materials.
5.2.11.2 The materials with low heat conductivity coefficient and good low-temperature impact toughness shall be adopted as metallic bracing materials; the operating temperature shall be within the allowable operating temperature range of materials and shall meet the standard requirements for corresponding materials.
5.2.12 Framework materials
5.2.12.1 The steel plates and profiles for corner posts, end beams, side beams and bracings shall have good weldability, sufficient strength and impact toughness, and shall meet the requirements of corresponding material standards.
5.2.12.2 The main stressed members such as corner posts, end beams and side beams of framework shall have sufficient impact toughness at -20???. Where Charpy V-notch impact test is conducted, the test temperature is -20???, and the average impact absorbed energy (KV2) of three standard samples shall not be less than 27J.
5.2.12.3 As for the materials of frameworks and bracings, the corrosive effect of external environment and the effect of ambient temperature shall be considered.
5.2.13 Others
5.2.13.1 The purchased parts shall meet the requirements of relevant national standards or professional standards, and be provided with quality certificate or product certificate. 5.2.13.2 The imported pressure pipeline elements shall meet the relevant requirements of the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China.
5.2.13.3 The fasteners shall meet the requirements of corresponding national standards or professional standards.
5.2.13.4 The corner fittings shall meet the requirements of GB/T 1835.
5.2.13.5 The sealing gasket shall be correctly selected according to the filling contents, working pressure and temperature, and shall meet the requirements of corresponding standards. Where PTFE gaskets are adopted, expanded or filled modified PTFE gaskets shall be selected. 5.2.13.6 The support materials shall have sufficient strength and impact toughness. 5.2.13.7 Other materials for tank containers shall meet the requirements of design drawings. 6 Design
6.1 General requirements
6.1.1 In addition to meeting the requirements of this standard, the design of tank containers shall also meet the requirements of relevant laws and regulations, safety technical regulations, national standards and professional standards.
f) instructions for use, including main technical performance parameters, applicable contents, specifications and connection methods of safety accessories, instruments and filling and discharging accessories, operation instructions, precautions for use, necessary warning requirements and emergency measures;
g) test outline for sample containers, including main test methods and qualification requirements, etc.
6.2.2 The general design drawings, tank drawings, risk assessment report and design calculation sheet shall be signed by design, check and review personnel and approved by the technical responsible person of the design unit or its authorized person.
6.2.3 The general design drawings shall at least cover the following information: a) product name, model as well as main safety technical regulations and standards for design and fabrication;
b) modes of transportation, including applicable railway, road, waterway transportation or combined transportation thereof;
c) working conditions, including service environment temperature, working temperature, working pressure, contents characteristics (explosion hazard degree), etc.; d) design conditions, including design temperature, minimum design metal temperature, design load (including pressure load and other necessary loads), contents (components), corrosion allowance, etc., and the limited content of corrosion contents shall also be indicated for those vulnerable to stress corrosion;
e) main characteristic parameters, including the rating mass of tank containers, empty mass, geometric volume of inner vessel and vacuum annular space, specified filling rate, maximum allowable filling amount, etc.;
f) design service life;
g) special fabrication requirements (nitrogen or inert gas replacement requirements, etc.); h) requirements for pressure test;
i) requirements for leakage test;
j) tank vacuum insulation type, vacuum performance indexes, vacuum insulation performance indexes, vacuum design service life, etc.;
k) anti-corrosion requirements (if necessary);
l) specifications, performance parameters and connection methods of safety accessories, instruments and filling and discharging accessories;
m) orientation, specifications, connecting flange standards for filling and discharging nozzle; n) gas protection requirements during transportation (tank sealing pressure limit of nitrogen or other insoluble gases, etc.);
o) allowable stacking mass;
p) location of nameplate;
q) other relevant requirements stipulated by the competent departments of railway, road and waterway.
6.2.4 The design drawing for tanks shall at least cover the following information: a) designation, specification, standard and requirements for materials of main pressure elements; b) main design parameters, including design temperature, design pressure, minimum design metal temperature, corrosion allowance, contents density, specified filling rate, maximum allowable filling amount, filling contents and its hazards, geometric volume of inner vessel and vacuum annular space, welded joint coefficient, etc.; the limited content of corrosion contents shall also be indicated for those vulnerable to stress corrosion; c) calculated thickness, nominal thickness and minimum forming thickness of the drum and seal head of inner vessel and outer jacket;
d) requirements for non-destructive testing;
e) requirements for heat treatment (if necessary);
f) requirements for pressure test;
g) tank vacuum insulation type, vacuum performance indexes, vacuum insulation performance indexes, vacuum design service life, etc.;
h) anti-corrosion requirements (if necessary);
i) design service life of tank (the fatigue tank shall be indicated with the number of cycles). 6.3 Dimension, tolerance and rating mass
6.3.1 The external dimensions and tolerances of tank containers shall meet the requirements of d) acting force of the connecting position or supporting position between the supports, framework or other types of bracing parts and the tank;
e) acting force of connecting pipelines and other components;
f) dead weight of tank as well as the gravity load of filling contents under normal working conditions or test conditions;
g) gravity load of auxiliary equipment and pipelines, escalators, platforms, etc.; h) acting force caused by temperature gradients or different thermal expansion amounts; i) impact load caused by sharp fluctuation of pressure;
j) impact force, such as acting force caused by liquid impacting the tank, etc.; k) cyclic dynamic load due to pressure or temperature change, equipment installed on the tank container or tank and mechanical load, etc.;
l) load during type test.
6.4.2.3 The following temperature difference loads shall be considered during tank design: a) Temperature difference load borne by the inner vessel at the bracing point during the cooling from the ambient temperature to the working temperature.
b) Pipeline reactive force caused by different thermal expansions among inner vessel, pipeline and outer jacket, and at least the following working conditions shall be considered: 1) cooling process of liquid inlet: the inner vessel and outer jacket are in thermal state, while the pipeline system is in cold state;
2) filling and discharging process: the inner vessel and pipeline system are in cold state, while the outer jacket is in thermal state;
3) transportation process: the inner vessel and outer jacket are in cold state, while the pipeline system is in thermal state.
c) when the annular space is heated and vacuumized in the fabrication process of tank, the temperature difference load of the inner vessel at the bracing point, the pipelines between the inner vessel and the outer jacket and the connection between the pipeline and inner vessel shall be considered.
6.4.2.4 The inertial force load borne by the tank and its fastening device during transportation shall be converted into equivalent static force according to the following requirements: a) direction of motion: twice of the maximum mass multiplied by gravitational acceleration; b) horizontal direction perpendicular to the direction of motion: maximum mass multiplied by gravitational acceleration (twice of the maximum mass multiplied by gravitational acceleration where the direction of motion is unclear);
c) vertically upward: maximum mass multiplied by gravitational acceleration; d) vertically downward: twice of the maximum mass multiplied by gravitational acceleration. Note 1: when the inertial force load borne by the inner vessel during transportation is calculated, the maximum mass refers to the maximum allowable filling amount of contents; when the inertial force load borne by annular space bracing or the connection between annular space bracing and outer jacket, the maximum mass refers to the sum of the maximum allowable filling amount, mass of inner vessel and mass of accessories; when the inertial force load borne by the connection between tank and framework during transportation is calculated, the maximum mass refers to the sum of the maximum allowable filling amount of contents, mass of tank and mass of accessories. Note 2: the above-mentioned load shall be applied to the centroid of tank and shall not cause the pressure in the gas- phase space of the tank to increase.
6.4.2.5 Fatigue analysis may not be carried out in case of any of the following conditions: a) The designed tank and the tank with successful use experience have comparable conditions as specified in Annex D, GB/T 150.1, and the fatigue analysis is not required according to the experience. However, special attention shall be paid to the adverse effects incurred due to the following conditions:
1) the inner vessel is of non-integral structure, for example, the opening is reinforced by reinforcing ring or fillet weld joint is adopted;
2) significant thickness variation occurs between...

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