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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 4783-2007 Road tankers for cryogenic liquid. With respect to JB/T 4783-2007, the following main technical changes have been made:
a) Standard name:
——changed from “Road tankers for cryogenic liquid” to “Road tankers for refrigerated liquefied gas”;
b) Scope:
——added the scope of inapplicability, definitions of road tanker and tank body, and main pressure elements;
c) Terms and definitions:
——deleted 19 terms and definitions, including cryogenic liquid and thermal insulation, and revised and added 11 terms and definitions, including high vacuum multilayer insulation and refrigerated liquefied gas;
d) Qualifications and responsibilities:
——changed the original "responsibilities" to "qualifications and responsibilities", added the responsibilities of the user or design entrusting party , and modified and improved the responsibilities of the design and fabrication units;
e) Materials:
——added 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;
f) Design:
——revised the design requirements for whole road tanker, load, design temperature, design pressure, pipeline, etc., and added the requirements for design by analysis method, minimum design metal temperature, minimum tank thickness, maximum allowable filling amount, etc.;
g) Safety accessories, instruments and filling and discharging accessories:
——clearly listed the categories of safety accessories, instruments and filling and discharging accessories, and modified relevant technical requirements;
h) Fabrication:
——added the requirements for welded joint classification, material reinspection, cold and hot processing, assembly, welding, nondestructive testing, etc. are modified, and the requirements for Class E welded joints, tank coating, etc.;
i) Test methods:
——added test methods such as ammonia leak detection, halogen leak detection and hydrogen leak detection;
j) Inspection rules:
——modified the requirements of inspection rules, and added the table for inspection items and their technical requirements;
k) Marking and identification:
——modified the requirements with respect to marking and identification;
l) Annexes:
——added two annexes, i.e., "Declaration of conformity and revision of the standard" and "Risk assessment report";
——deleted 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”;
——changed the original Annex A "Design and calculation of safety relief devices" to Annex C "Calculation of safe relief capacity of tank and discharge capacity of overpressure relief device", and modified the contents of calculation of safe relief capacity of tank and discharge capacity of overpressure relief device.
This standard was proposed by and is under the jurisdiction of SAC/TC 262 National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China.
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 SAC/TC262/SC4 Subcommittee on Transportable Pressure Vessels of the National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China.
The previous edition of this standard is as follows:
——JB/T 4783- 2007.
Road tankers 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 road tankers for refrigerated liquefied gas (hereinafter referred to as road tankers).
1.2 This standard is applicable to road tankers of which the design pressure of the tank inner vessel is not less than 0.1MPa, the geometric volume is not less than 1 m3, the vacuum powder insulation or high vacuum multilayer insulation structure is adopted, and the tank and the approved undercarriage or semi-trailer walking mechanism are permanently connected.
1.3 This standard is not applicable to the road tankers with the following:
a) tanks made of non-ferrous metal or non-metallic materials;
b) tanks filled with refrigerated liquefied gas contents with standard boiling point lower than -196℃;
c) tanks filled with toxic contents;
d) tanks with special requirements such as national defense military equipment.
1.4 Definition of scope
1.4.1 The road tankers applicable to this standard include tank, pipeline, safety accessories, instruments, filling and discharging accessories, approved undercarriage or semi-trailer walking mechanism, supports, operation boxes, pressure build coil, etc.
1.4.2 The tank (body) is defined as follows:
a) the beveled end surface of the first circumferential joint of welded connection between the tank and the pipeline;
b) the first threaded joint end surface of the threaded joint between the tank and the 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.
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 1589 Limits of dimensions, axle load and masses for motor vehicles, trailers and combination vehicles
GB/T 1804-2000 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 3531 Low alloy steel plates for low temperature pressure vessels
GB/T 3730.2 Road vehicle - Masses - Vocabulary and codes
GB/T 3730.3 Motor vehicles and towed vehicles - Dimensions of vehicles - Terms and definitions
GB/T 4351 (all parts) Portable fire extinguisher
GB/T 4606 Road vehicles - 50 semi-trailer fifth wheel coupling pin - Basic and mounting/interchangeability dimensions
GB/T 4607 Road vehicles - 90 semi-trailer fifth wheel coupling pin - Basic and mounting/interchangeability dimensions
GB 4785 Prescription for installation of the external lighting and light-signalling devices for motor vehicles and their trailers
GB 7258 Technical specifications for safety of power-driven vehicles operating on roads
GB/T 9969 General principles for preparation of instructions for use of industrial products
GB 11567 Motor vehicles and trailers-lateral and rear underrun protection requirements
GB/T 12241 Safety valves - General requirements
GB/T 12243 Spring loaded safety valves
GB 12676 Technical requirements and testing methods for commercial vehicle and trailer braking systems
GB/T 13296 Seamless stainless steel tubes for boiler and heat exchanger
GB 13365 Vehicle exhaust spark arrester
GB 13392 The vehicle mark for road transportation dangerous goods
GB/T 13550 Molecular sieve 5A and its determination
GB/T 13881 Pneumatic braking connections between motor vehicles and towed vehicles
GB/T 14525 General specification for corrugated metal hose assemblies
GB/T 14976 Seamless stainless steel pipe for liquid service
GB 16735 Road vehicles - Vehicle identification number (VIN)
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 20070 Road vehicle - Mechanical coupling between tractors and semi-trailers - interchangeability
GB 20300 Safety specifications for road transportation vehicle of explosive substance and chemical toxic substance
GB 21668 Provisions of vehicles for the carriage of dangerous goods with regard to their specific constructional features
GB/T 23336 General Technical Requirements for Semitrailer
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 equipments - 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 equipments - Part 4: Magnetic particle testing
NB/T 47013.5 Nondestructive testing of pressure equipments - Part 5: Penetrant testing
NB/T 47013.10 Nondestructive testing of pressure equipments - 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 5943 Construction machinery - General specifications for welding parts
JB/T 6804 Shock-resistant pressure gauge
JB/T 6896 Surface cleanliness of air separation plants
JT 230 Rubber belt of electrostatic conductivity
QC/T 252 Type approval test regulations for special automobile
QC/T 310 Semi-trailer support device
QC/T 484 Automobiles - Paint coating
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 3730.2, GB/T 3730.3, 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
road tankers for refrigerated liquefied gas
road tankers for storing refrigerated liquefied gas, in which the tank body and the approved undercarriage or semi-trailer walking mechanism are permanently connected
3.3
tank truck
road tanker vehicle whose tank body is mounted on an approved undercarriage
3.4
semi-trailer
road tanker vehicle whose tank body is mounted on an unpowered semi-trailer walking mechanism
3.5
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
3.6
vacuum powder insulation
mode of insulation by vacuuming the vacuum annular space of the tank filled with porous particle insulation materials
3.7
geometric volume
internal volume of the inner vessel determined according to the design geometric dimension minus the volume occupied by the inner parts
3.8
effective volume
maximum liquid volume of refrigerated liquefied gas that is allowed to be filled in an internal vessel in use
3.9
equivalent pressure
pressure on the tank caused by the inertial force of the contents under normal transportation conditions
3.10
filling rate
ratio of the liquid volume of the refrigerated liquefied gas filled in a road tanker to the geometric volume of the inner vessel
3.11
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 road tanker filling
3.12
reference steel
reference material with the lower limit of set standard tensile strength, Rm, of 370MPa and the elongation after fracture, A, of 27%
3.13
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 road tankers 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 road tanker shall obtain the corresponding special equipment design and fabrication licenses according to TSG R0005.
4.1.3 The fabrication unit of road tankers shall hold the corresponding special equipment fabrication license, and obtain the fabrication qualification in accordance with the requirement of the competent department of industry under the State Council.
4.2 Responsibilities
4.2.1 User or design entrusting party
The user or design entrusting party shall submit the design conditions of road tankers 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) working conditions, including service environment temperature, working temperature range, working pressure range, filling and discharging conditions and methods, filling and discharging pressure, additional loads, road conditions, etc.;
c) 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.;
d) geometric volume or effective volume of the inner vessel;
e) expected service life of road tankers and vacuum annular space;
f) required holding time;
g) number of pressure cycles corresponding to fluctuating pressure;
h) model and necessary technical parameters of the approved undercarriage or tractor;
i) other necessary conditions for design, such as 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 road tanker 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 road tankers.
4.2.3 Fabrication unit
4.2.3.1 The road tankers 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 road tankers.
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 road tanker 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 road tankers shall be subjected to type test and other applicable tests conducted by the competent department or the test agency approved by the competent department according to types, and shall obtain the qualification certificate.
4.2.3.8 The fabrication unit shall keep at least the following technical documents for each road tanker 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.
5 Materials
5.1 General requirements
5.1.1 The mechanical, physical and processing properties and the compatibility with contents shall be considered in 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.
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 Ex-factory 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
