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This standard is developed in accordance with the rules given in GB/T 1.1-2009 Directives for standardization - Part 1: Structure and drafting of standards.
This standard replaces JB/T 4784-2007 Tank containers for cryogenic liquid, with respect to which, the following main technical changes have been made:
a) standard name:
——changed from the original Tank containers for cryogenic liquid to Tank containers for refrigerated liquefied gas;
b) scope:
——the scope of inapplicability, tank containers and tanks, and main pressure elements are added;
c) terms and definitions:
——l6 terms and definitions, including cryogenic liquid and thermal insulation, are deleted, and 10 terms and definitions, including high vacuum multilayer insulation and refrigerated liquefied gas, are revised and added;
d) qualifications and responsibilities:
——the original "responsibilities" is changed to "qualifications and responsibilities", wherein, the responsibilities of the user or design entrusting party are added, and the responsibilities of the design and fabrication units are modified and improved;
e) materials:
——the requirements for steel plates, steel forgings, steel pipes and fittings, welding materials, insulation materials, adsorbent materials and annular space bracing materials are modified, and the requirements for sealing gaskets are added;
f) design:
——the design requirements for load, design temperature, design pressure, framework, pipeline, etc. are modified, and the requirements for design by analysis method, minimum design metal temperature, minimum tank thickness, maximum allowable filling amount, etc. are added;
g) safety accessories, instruments and filling and discharging accessories:
——the categories of safety accessories, instruments and filling and discharging accessories are clearly listed, and relevant technical requirements are modified;
h) fabrication:
——the requirements for welded joint classification, material re-inspection, cold and hot processing, assembly, welding, nondestructive testing, etc. are modified, and the requirements for Class E welded joints, tank coating, etc. are added;
i) test methods:
——test methods such as ammonia leak detection, halogen leak detection and helium leak detection are added;
j) inspection rules:
——the requirements of inspection rules are modified, and the table for inspection items and their technical requirements is added;
k) marking and identification:
——the requirements with respect to marking and identification are modified;
l) annexes:
——two annexes, i.e., "Declaration of conformity and revision of the standard" and "Risk assessment report", are added;
——the original three annexes, i.e., "Test method for holding time", "Format and content of product quality certificate" and "Physical property parameters of common cryogenic liquids”, are deleted;
——the original Annex A "Design and calculation of safety relief devices" is changed to Annex C "Calculation of safe relief capacity of tank and discharge capacity of overpressure relief device", and the contents of calculation of safe relief capacity of tank and discharge capacity of overpressure relief device are modified.
This standard was proposed by and is under the jurisdiction of the National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC 262).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This standard is drafted by Subcommittee on Transportable Pressure Vessels of the National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC 262/SC4).
The previous edition of this standard is as follows:
——JB/T 4784-2007.
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.
1.4.3 The pipeline includes all pipes and fittings connected to the tank.
1.4.4 Main pressure elements include the cylinder and seal head of the inner vessel, as well as pipes with the nominal diameter not less than 15mm, pipe sockets, flanges, flange cover plates, etc. in contact with the filling contents.
1.5 The requirements set forth in this standard are basic safety technical requirements, and the tank containers conforming to this standard may be suitable for road, railway or waterway transportation and combined transportation thereof.
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 amendments) applies.
GB/T 150.1 Pressure vessels - Part 1: General requirements
GB/T 150.2 Pressure vessels - Part 2: Materials
GB/T 150.3-2011 Pressure vessels - Part 3: Design
GB/T 150.4-2011 Pressure vessels - Part 4: Fabrication, inspection and testing, and acceptance
GB/T 567.1 Bursting disc safety devices - Part 1: Basic requirement
GB/T 567.2 Bursting disc safety devices - Part 2: Application, selection and installation
GB/T 567.3 Bursting disc safety devices - Part 3: Classification and mounting dimensions
GB/T 713 Steel plates for boilers and pressure vessels
GB/T 1413 Series 1 freight containers - Classification, dimensions and ratings
GB/T 1804-2000 General tolerances－Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 1835 Series 1 freight container - Corner fittings
GB/T 1836 Freight containers - Coding, identification and marking
GB/T 3531 Steel plates for low temperature pressure vessels
GB/T 12241 Safety valves - General requirements
GB/T 12243 Spring loaded safety valves
GB/T 13296 Seamless stainless steel tubes for boiler and heat exchanger
GB/T 13550 Molecular sieve 5A and its determination
GB/T 14525 General specification for corrugated metal hose assemblies
GB/T 14976 Seamless stainless steel pipes for fluid transport
GB/T 16563 Series 1 tank containers for liquids, gases and pressurized dry bulk - Specification and testing
GB/T 17600
(All parts) Steel - Conversion of elongation values
GB/T 18443
(All parts) Testing method of performance for vacuum Insulation cryogenic equipment
GB/T 24511 Stainless steel plate, sheet and strip for pressure equipment
GB/T 24918 Cryogenic emergency shutoff valve
GB/T 25198 Heads for pressure vessels
GB/T 26929 Terminology for pressure vessels
GB/T 31480 Materials for high vacuum multilayer insulation of cryogenic vessel
GB/T 31481 Guidance for gas/materials compatibility of cryogenic vessels
NB/T 47009 Low alloy steel forgings for low temperature pressure equipment
NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipments
NB/T 47013.1 Nondestructive testing of pressure equipment - Part 1: General requirements
NB/T 47013.2 Nondestructive testing of pressure equipment - Part 2: Radiographic testing
NB/T 47013.3 Nondestructive testing of pressure equipment - Part 3: Ultrasonic testing
NB/T 47013.4 Nondestructive testing of pressure equipment - Part 4: Magnetic particle testing
NB/T 47013.5 Nondestructive testing of pressure equipment - Part 5: Penetrant testing
NB/T 47013.10 Nondestructive testing of pressure equipment - Part 10: Ultrasonic time of flight diffraction technique
NB/T 47013.11 Nondestructive testing of pressure equipment - Part 11: Standard practice for X-ray digital radiography
NB/T 47013.14 Nondestructive testing of pressure equipment - Part 14: X-ray computed radiographic testing
NB/T 47014 Welding procedure qualification for pressure equipment
NB/T 47016 Mechanical property tests of product welded test coupons for pressure equipment
NB/T 47018.1 Technical permission of welding materials for pressure equipment - Part 1: General rule
NB/T 47018.2 Technical permission of welding materials for pressure equipment - Section 2: Electrodes for steel
NB/T 47018.3 Technical permission of welding materials for pressure equipment - Section 3: Steel electrodes and rods for gas shielded arc welding
NB/T 47018.4 Technical permission of welding materials for pressure equipment - Section 4: Electrodes and fluxes for submerged arc welding
HG/T 2690 Molecular sieve 13X
JB/T 4711 Coating and packing for pressure vessels transport
JB 4732-1995 Steel pressure vessels - Design by analysis (Confirmed in 2005)
JB/T 6804 Shock-resistant pressure gauge
JB/T 6896 Surface cleanliness of air separation plants
YS/T 599 Super fine palladium oxide powder
TSG R0005 Supervision regulation on safety technology for transportable pressure vessel
TSG Z6002 Examination rules for welding operators of special equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 150.1, GB/T 150.4, GB/T 16563, GB/T 18443 and GB/T 26929 as well as the following apply.
3.1
refrigerated liquefied gas
gas which is partially in liquid state due to low temperature during transportation, the critical temperature of which is generally not higher than -50℃
3.2
tank containers for refrigerated liquefied gas
tank containers composed of vacuum insulated tank and framework for storing refrigerated liquefied gas
3.3
high vacuum multilayer insulation
mode of insulation by highly vacuuming the annular space of the tank equipped with multiple layers of screens against thermal radiation which are alternately insulated by insulation materials
3.4
vacuum powder insulation
mode of insulation by vacuuming the vacuum annular space of the tank filled with porous particle insulation materials
3.5
geometric volume
internal volume of the inner vessel determined according to the design geometric dimension minus the volume occupied by the inner parts
3.6
effective volume
maximum liquid volume of refrigerated liquefied gas that is allowed to be filled in an internal vessel in use
3.7
equivalent pressure
pressure on the tank caused by the inertial force of the contents under normal transportation conditions
3.8
filling rate
ratio of the liquid volume of the refrigerated liquefied gas filled in a tank container to the geometric volume of the inner vessel
3.9
specified filling rate
ratio of the liquid volume to the geometric volume of the inner vessel where the filled liquid volume reaches the highest liquid level specified in the design during tank container filling
3.10
rating mass R
total mass of the tank container, which is the maximum during operation while the minimum during test
3.11
reference steel
reference material with the lower limit of set standard tensile strength, Rm, of 370MPa and the elongation after fracture, A, of 27%
3.12
sealing-off vacuum degree
vacuum degree where the pressure of the vacuum annular space is relatively stable at normal temperature after the vacuumizing and sealing-off of tank
4 Qualifications and responsibilities
4.1 Qualifications
4.1.1 The design, fabrication, inspection and acceptance of the tank containers shall not only meet the requirements of this standard, but also meet those of relevant laws, regulations and safety technical regulations issued in China.
4.1.2 The design and fabrication units of the tank container shall obtain the corresponding special equipment design and manufacturing licenses according to TSG R0005.
4.2 Responsibilities
4.2.1 User or design entrusting party
The user or design entrusting party shall submit the design conditions of tank containers to the design unit in formal written form, at least covering:
a) main standards and safety technical regulations to be followed in design and fabrication;
b) modes of transportation, including railway, road, waterway transportation or combined transportation thereof;
c) working conditions, including service environment temperature, working temperature range, working pressure range, filling and discharging conditions and methods, filling and discharging pressure, additional loads, etc.;
d) filling contents, including No., name, category, composition, physical and chemical properties, hazardous characteristics, harmful substance content and the corrosion rate to tank materials thereof, etc.;
e) geometric volume or effective volume of the inner vessel;
f) container dimensions and specifications;
g) expected service life of tank containers and vacuum annular space;
h) required holding time;
i) number of pressure cycles corresponding to fluctuating pressure;
j) main dimensional requirements and nozzle orientation;
k) other necessary conditions for design (e.g. tank material selection, corrosion prevention, surface treatment and special test).
4.2.2 Design unit
4.2.2.1 The design unit shall complete the overall design of tank container based on 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 special design seals shall meet the requirements of TSG R0005.
4.2.2.3 The design unit shall preserve all design documents within the design service life of tank containers.
4.2.3 Fabrication unit
4.2.3.1 The tank containers shall be subjected to integrated fabrication, and the fabrication unit shall be responsible for the fabrication quality of them.
4.2.3.2 The fabrication unit shall fabricate in accordance with the requirements of design documents; where the original design is modified, written certificate of the original design unit for agreement on modification shall be obtained, and the modified parts shall be recorded in detail.
4.2.3.3 The fabrication unit shall formulate a quality plan before fabrication, which shall at least include the fabrication process control points, inspection items and qualification requirements of tank containers.
4.2.3.4 The inspection department of the fabrication unit shall carry out all inspections and tests according to the requirements of this standard, design drawings, design documents and quality plans during and after the fabrication, provide corresponding reports and be responsible for the report accuracy and integrity.
4.2.3.5 After passing the inspection, each tank container shall be provided with a product certificate by the fabrication unit.
4.2.3.6 The fabrication unit shall receive the supervision and inspection on its fabrication process by the special equipment supervision and inspection organization and obtain the "certificate for fabrication supervision and inspection of special equipment" issued by the supervision and inspection unit.
4.2.3.7 The tank containers shall be subjected to sample container type test and low-temperature performance type test according to types, and shall obtain the qualification certificate approved by the competent department.
4.2.3.8 The fabrication unit shall keep at least the following technical documents for each tank container within the design service life for future reference:
a) fabrication process drawing or fabrication process card;
b) documents on welding process and heat treatment process of tank;
c) records on inspection and test items specified in the standard;
d) check, inspection and test records during and upon completion of fabrication;
e) ex-factory documents (in accordance with the requirements of Clause 12);
f) original design documents.
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Qualifications and responsibilities
5 Materials
6 Design
7 Safety accessories, instruments and filling/discharging accessories
8 Fabrication
9 Test methods
10 Inspection rules
11 Marking and identification
12 Delivery documents
13 Storage and transportation
Annex A (Normative) Declaration of conformity and revision of the standard
Annex B (Normative) Risk assessment report
Annex C (Normative) Calculation of safe relief capacity of tank and discharge capacity of overpressure relief device
Bibliography
