Some standard content:
GB/T7392—1998
This standard is revised by adopting the international standard ISO1496-2:1996 "Cargo Container Series 1 Standard Part 2-Technical Conditions and Test Methods for Insulated Containers", and is equivalent to it in terms of technical content and writing rules. This standard is the second edition of GB7392. The main difference from the first edition in 1987 is that the relevant parts of 10D and 5D boxes have been deleted, and the B series and D series boxes with lengths of 9125mm and 2991mm respectively have been added. The 1AAA box with a height of 7392mm has been added. In addition, the original mandatory standard has been changed to a recommended standard. For this reason, the formulation of this standard is equivalent to the international standard ISO1496-21996 in terms of both technical content and writing rules. The difference is that this standard converts the format of the international standard into the format of the national standard in accordance with the national standard GB/T1.1-1993 "Guidelines for Standardization Work Unit 1: Rules for Drafting and Presentation of Standards Part 1: Basic Provisions for Writing Standards". Under the general title of "Series 1: Technical Requirements and Test Methods for Containers", it includes the following six standards: GB/T5338-1995 "Technical Conditions and Test Methods for 1AAA, 1AA, 1A and 1AX General Containers" (neqISO1496-1:1991);
GB/T3219-1995 "Technical Conditions and Test Methods for 1CC, 1C and 1CX General Containers" (neqISO1496-1:1991); GB/T7392-1998 "Series 1: Technical Requirements and Test Methods for Insulated Containers" (id tISO1496-2:1996); GB/T16563--1996 "Series 1: Technical requirements and test methods for liquid, gas and pressurized dry bulk tank containers" (idtISO1496-3:1995),
GB/T17274~1998 "Series 1: Technical requirements and test methods for non-pressurized bulk containers" (idtISO1496-4:1991); GB/T16564-1996 "Series 1: Technical requirements and test methods for platform and platform containers" (idtISO1496-5:1991). This standard replaces GB7392-87 from the date of implementation. Appendices A, B, C, D, E, F, G, H, J, K and L of this standard are all appendices to the standard;
Appendices M, N and P of this standard are all indicative appendices. This standard is proposed by the Ministry of Transport of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Container Standardization. The drafting units of this standard are: Water Transport Research Institute of the Ministry of Communications, Ministry of Communications Science Research Institute, Dalian Maritime University, Shanghai CIMC Reefer Container Co., Ltd.
The main drafters of this standard are: Si Shuyun, Du Feng, Yang Chunling, Guan Shenqian. 238
GB/T 7392--1998
ISO Foreword
The International Organization for Standardization (ISO) is an international joint organization composed of national standardization organizations (ISO group members) of various countries. The drafting of international standards is usually carried out through ISO's technical committees. For established technical committees, each group member has the right to send representatives to participate. All governmental and non-governmental international organizations that have liaison relations with ISO also participate in the relevant work. In all matters involving electrotechnical committees, ISO will maintain close cooperation with the International Electrotechnical Commission (IEC). Draft international standards prepared by each technical committee will be distributed to each group member before voting. Anyone who promulgates an international standard must obtain the approval of at least 75% of the group members.
ISO1496-2 international standard was proposed by SC2 Special Container Subcommittee, a subcommittee of ISO/TC104 Container Technical Committee.
This standard is the fourth edition of ISO1496-2 and will replace the third edition of ISO1496-2 promulgated in 1988. The main revisions of the new version are as follows:
a) Add two types of containers, 1AAA and 1BBB, and the description of their dimensions and performance; b) Add relevant requirements for the retention of hanging equipment, including technical conditions and functions, etc.; c) Only one type of electrical equipment is allowed to be used, replacing the previous three regulations. ISO1496 includes the following parts under the name of technical conditions and test methods for the first series of containers: Part 1 General purpose containers for general cargo; Part 2 Insulated containers; Part 3 Tank containers for liquid cargo, gaseous cargo and pressurized dry bulk cargo, Part 4 Unpressurized dry bulk containers, Part 5 Platform and platform containers. Appendices A to L of this standard are standard appendices, and Appendices M to P are informative appendices. 239 GB/T 7392--1998 The technical conditions of the ISO1496 standard series are classified according to the following container types. Part 1
General purpose containers
Special purpose containers
Closed, breathable, ventilated
Top-mounted
Part 2
Insulated containers
Part 3
Tank containers (pressure)
Pressurized dry bulk containers
Part 4
Unpressurized dry bulk containers (box type)
Unpressurized dry bulk containers (hopper type)
Part 5
Platform containers
Fixed-end platform containers with incomplete superstructure Folded-end platform containers with incomplete superstructure Platform containers with complete superstructure
Note: Parts 1 and 3 to 5 are to be described in detail in the corresponding texts of the ISO 1496 series. 240
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1 Scope
National Standard of the People's Republic of China
Series 1: Technical requirements and test methods for containers Thermal containers
Series 1: Thermal containersSpecification and testing
GB/T 7392—1998
idt ISO 1496-2: 1996
Replaces GB7392-87
This standard specifies the technical requirements and test methods for ISO Series 1 thermal containers for road, rail, water transport and combined use. Note: For ease of application, this standard lists the conversion table of statutory and non-statutory units in Appendix N. 2 Referenced standards
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1835-1995 Technical conditions for container corner fittings GB/T1836--1997 Container codes, identification and marking ISO668:1995 Series 1 container types, dimensions and rated masses ISO830:1981 Containers-Terminology
ISO10368:1992 Remote sensing of working conditions of insulated containers IEC 947-1:1988
3 Definitions
Low-voltage switches and controllers-Part 1: General This standard quotes several common definitions listed in ISO830. 3.1 Thermal container is a general term for containers equipped with wall panels, doors, bottoms and roofs with insulation layers to slow down the heat exchange between the inside and outside of the container. Its classification is shown in Table 1. 3.2 Insulated container is an insulated container without any fixed temporary refrigeration and/or heating equipment. 3.3 Refrigerated container - expensible refrigerant refers to a container with or without evaporation control that uses liquid or the like as a refrigerant. Note: This type of container refers to various refrigerated containers that do not require external power or fuel supply. 3.4 Mechanically refrigerated container is an insulated container equipped with a refrigeration device (such as a refrigeration compressor unit, absorption refrigeration unit, etc.). 3.5 Heated container is an insulated container equipped with only a heating device. 3.6 Refrigerated and heated container Refrigerated and heated container Insulated container with refrigeration (mechanical refrigeration or refrigeration using refrigerant) and heating device. 3.7 Refrigerated and heated container with controlled or modified atmosphere Approved by the State Administration of Technical Supervision on March 20, 1998 and implemented on October 1, 1998
| Refrigerated and heated container with refrigerated and heated device and fixed with an atmosphere conditioning device, which can produce and/or maintain a modified air composition. 3.8 Removable equipment Refrigerant and/or heating equipment and generator set that can be mounted on or removed from the insulated container. 3.9 Located internally Installed entirely within the external dimension limits specified in ISO668. 3.10 Located externally Installed partially or entirely outside the external dimension limits specified in ISO668. Note: This definition also includes external equipment that needs to be removed or retracted in certain transport conditions. 3.11 Batten
A ridge installed on the inner wall of an insulated container to form an air passage between the cargo and the inner wall. It can be integrated with the inner wall of the container, fixed to the inner wall separately, or attached to the inner wall of the container when loading. 3.12 Buldhead
A partition installed to form an air chamber and a supply or return air channel. Note: It can be an integral part of the equipment or a separately installed component. 3.13 Ceiling air duct
One or more air ducts arranged close to the inner ceiling to guide the airflow. 3.14 Floor duct
One or more air ducts arranged below the cargo loading surface to guide the airflow. 3.15 Pin mounting
It is a kind of mounting part, which uses a pair of pins, which are inserted vertically into the socket of the upper end beam, so that the entire mounting equipment is supported by the upper end beam.
3.16 Lower mounting points are a pair of threaded connection holes used to fasten the two lower corners of the mounting equipment. 4 Classification
The classification of insulated containers involved in this standard is shown in Table 1, and the table also lists the maximum allowable heat leakage rate. The corresponding values of the temperature units K and C are shown in Table 2.
Table 1 Classification of insulated containers
Maximum heat leakage rate 1)
Refrigerant-consuming refrigerated container
Machine-cooled refrigerated container
Refrigerating/heating container
Heating container
Spare number
Powered machine-cooled refrigerated container
Powered refrigerated/heating container
Powered heating container
Umax/(W/K)
Design temperature? ）
Spare number
External mounted refrigerated/heated container
Internal mounted refrigerated/heated container
External mounted refrigerated/heated container
Spare number
Insulated container (I)
Insulated container (I)
Spare number
GB/T 7392—1998
Table 1 (end)
Maximum heat leakage rate 1)
Umx/(W/K)
Design temperature\)
1) The maximum heat leakage rate Umx of the heavily insulated containers with codes 30, 31, 32, 33, 36, 40, 41 and 45 is converted according to the heat transfer coefficient K ~ 0.4W/(m2·K). The maximum heat leakage rate Uma of light insulated containers with code 42 and 46 is calculated according to the heat transfer coefficient K0.7W/(m2K).
2) See Table 2.
3) The temperature limit of this type of insulated container is not specified. Its actual performance depends on the capacity of the equipment mounted on each mode of transportation. Table 2 Correspondence table of K and ℃
Note: For temperature difference 1K=1℃
5 Marking
The marking of insulated containers shall comply with the principles listed in GB/T1836. 289
For insulated containers that can be mounted and have air conditioning, they shall be marked in accordance with the requirements listed in 7.9.7 and 7.9.8. 6 Dimensions and rated mass
6.1 External dimensions
The external dimensions of the insulated container shall comply with the requirements of ISO668. No part of the container shall exceed this limit. 6.2 Internal dimensions
The internal dimensions of the insulated container should be as large as possible. The dimensions should be measured from the inner surface of the partitions, partitions, top ducts and bottom ducts in the container.
The minimum internal dimensions of ISO series 1 insulated containers are shown in Table 3. Table 3 Minimum internal dimensions 1)
Subtract the following corresponding values from the external dimensions Box type code
30,31,32,33
36,37,38,41
Without gooseneck slot
Height 1)
With gooseneck slot
Box type code
GB/T7392--1998
Table 3 (End)
Subtract the following corresponding values from the external dimensions Width
Without gooseneck slot
With gooseneck slot
Note: For those insulated containers manufactured according to early ISO standards, especially refrigerated containers equipped with diesel generators, their internal length dimensions are significantly smaller than the values listed in the table
1) The internal height and length dimensions of some insulated containers have taken into account the needs of air circulation. 6.3 Rated mass
Rated mass R is the maximum total mass of the insulated container and shall comply with the provisions of ISO668. 7 Design requirements
7.1 General
The design of the insulated container shall meet the following requirements. 7.1.1 The strength requirements of the insulated container are listed in Appendix A (Standard Appendix) of this standard in a graphical manner (unless otherwise specified, these requirements apply to all insulated containers). Unless otherwise specified in 8.1, the listed requirements shall be implemented on the entire container. 7.1.2 The strength of the corner fittings (see 7.2) shall comply with the provisions of GB/T1835. 7.1.3 The insulated container shall be able to withstand the loads and loadings listed in Chapter 8 of this standard. 7.1.4 The dynamic load effect caused by any working condition shall only approach but not exceed the effect of the corresponding test load. Therefore, the load-bearing capacity shown in Appendix A and explained in the test clauses of Chapter 8 of this standard shall not be exceeded under any working condition. 7.1.5 All the closing parts of the openings on the thermal insulation container that are prone to accidents should be equipped with necessary fixing devices and have obvious external markings to indicate that the parts have been reliably fixed in place. In particular, the door should be firmly positioned whether it is closed or open. 7.1.6 The wall, door, bottom and top of the box should be insulated to reduce the heat exchange in each place as much as possible. The insulation of the top of the box should also be strengthened to compensate for the radiation of the sun.
7.2 Corner fittings
All thermal insulation containers need to be equipped with top and bottom corner fittings, and their specific requirements and installation positions should comply with the provisions of GB/T1835. The top surface of the top corner fittings shall be at least 6mm higher than the top of the box (see 3.4). The so-called "top of the box" refers to the highest point on the top surface of the box. If a reinforcement area or double plate is installed near the corner fittings to protect the box, the plate and its connection position shall not be higher than the top surface of the top corner fittings. The maximum dimension along the length of the box measured from the end is 750mm. However, this is not limited to the width of the box. 7.3 Bottom structure
7.3.1 The insulated container shall be able to be supported by its four bottom corner fittings only. 7.3.2 Except for 1D type boxes, various types of insulated containers The box can also be supported only by the load transfer area at its bottom. 7.3.2.1 Therefore, the insulated container should have end transverse members (sills and lower end beams) and sufficient intermediate load transfer areas (or flat box bottoms), the strength of which should be intended to withstand the vertical forces between the main beams of the skeleton trailer. The load transfer position is limited to the two transfer belts with a width of 250mm as shown by the dotted lines in Figure B1 of Appendix B (Standard Appendix). 7.3.2.2 The bottom plane of the load transfer area, including the transverse members, should be located 12.5=i.. mm, except for the bottom corner fittings and the lower side beams, no part of the insulated container shall be lower than this plane. To protect the bottom structure, the reinforcement plate installed near the bottom corner fittings is no exception.
The reinforcement plate shall not be more than 550mm and 470mm away from the outer end face and outer side face of the bottom corner fittings respectively. Its bottom plane shall be at least 5mm higher than the bottom surface of the bottom corner fittings.
GB/T7392-1998
7.3.2.3 When the spacing of the bottom cross beams of the insulated container is less than or equal to 1000mm or the bottom is flat, the design shall be carried out in accordance with the requirements of 7.3.2.1.
7.3.2.4 When the spacing of the bottom cross beams of the insulated container is greater than 1000mm or the bottom is not flat, the design requirements are shown in Appendix B. 7.3.3 Except for the explanations listed in 7.3.4, no specific provisions are made for the bottom position of the bottom structure of 1D type insulated container. 7.3.4 When various insulated containers are subjected to dynamic loads or corresponding static loads, that is, when the bottom of the container is subjected to a uniformly distributed load equal to 1.8R including the mass of the container itself, any part of the bottom of the container should not be lower than 6mm below the bottom plane of the bottom corner piece. 7.3.5 The bottom structure of the container should be designed to withstand various forces generated by the goods in the container during transportation, especially lateral forces. This is more important for those containers that are fastened to the goods through the bottom structure. 7.4 End structure
For various insulated containers other than 1D, when conducting the overall transverse rigidity test, the sum of the changes in the length of the two diagonals caused by the transverse displacement of the top relative to the bottom should not exceed 60mm. Note: For refrigerated containers equipped with built-in units, the rigidity of the end structure is not necessarily equal to the sum of the rigidity of the unit and the container, because it is related to the assembly method of the unit.
7.5 Side structure
For various insulated containers other than 1D, when conducting the overall longitudinal rigidity test, the longitudinal displacement of the top relative to the bottom should not exceed 25mm.
7.6 Wall panels
The ability of the end wall or side wall with door opening to withstand test 5 and test 6 shall not be reduced. 7.7 Door frame opening
Each insulated container shall be provided with a door at least at one end. All doors and end openings shall be as large as possible. The net width of the inner frame of the door shall be close to the minimum internal dimensions specified in Table 3. The net height of the inner frame of the door shall be close to the minimum internal dimensions specified in Table 3. 7.8 Hygiene requirements
Attention should be paid to the correct selection of materials for insulated containers and their refrigeration/heating equipment to prevent adverse effects on goods, especially food, and the requirements of relevant Chinese and international standards should also be considered. The inner wall and structure of the container shall be easy to clean, and there shall be no dead corners that cannot be cleaned by normal cleaning processes. The structure and insulation of the container shall not be affected when fumigation and general detergents are used for cleaning. When a steam trap is provided, the cleaning liquid shall be able to be discharged smoothly from the container. 7.9 Optional Facilities
7.9.1 Fork Slots
7.9.1.1 Fork slots may be provided for forklifting of loaded or empty 1CC, 1C and D insulated containers. Fork slots shall not be provided for 1AAA, 1AA, 1A, 1BBB, 1BB and 1B insulated containers. 7.9.1.2 Fork slots may be provided for 1CC and 1C insulated containers provided with a pair of fork slots as specified in 7.9.1.1, a second pair of slots may be provided for forklifting empty containers only.
Note: One of the above two pairs of slots may be used together with the slot provided in accordance with 7.9.1.1, provided that the center formed by them is as close as possible to the center of mass of the empty container.
7.9.1.3 The dimensions of the fork slots shall meet the requirements of Appendix C (Standard Appendix) and shall extend transversely through the bottom structure of the container so that the fork tines can be inserted from either side. The fork slot bottom plate is not required to be provided along the entire width of the container, but only to be provided near the two ends of the fork slots. 7.9.2 Gooseneck trough
A gooseneck trough must be provided for 1AAA and 1BBB insulated boxes, and an optional gooseneck trough can be provided for 1AA and 1BB boxes. The size requirements are shown in Appendix D (Appendix to the standard). In addition, other parts of the box structure should comply with the provisions of? .3. 7.9.3 Drainer
GB/T7392—1998
If the residual water in the cargo space needs to be discharged during loading, a drain device that can be automatically opened when the pressure in the box exceeds the normal value should be configured. If it is used to discharge the wastewater from washing the box, a manual valve can be provided. The requirements of the customs and health departments should be considered. 7.9.4 Water pipe joint
When the equipment needs to be connected to a water source, the size of its inlet and outlet water pipe joints should comply with the requirements of Appendix E (Appendix to the standard). Water-cooled equipment should be able to automatically drain water, or be able to discharge residual water together with the device to prevent the accumulated water from freezing. The joints of the water inlet and outlet pipes shall be installed at one end of the box refrigeration unit and shall be located to the lower right of the observer when he faces this end. 7.9.5 Air inlet and outlet
When 1AAA, 1AA, 1A, 1BBB, 1BB, 1B, 1CC, 1C and 1D insulated containers are designed according to the requirements of ducted air supply and using external hanging units, the air inlet and outlet shall comply with the provisions listed in F1, F2 and F3 in Appendix F (Appendix of the standard). 7.9.6 Intermediate receiving groove of hanging units
When using hanging units, the position and size of the intermediate receiving groove required shall comply with the provisions of Appendix G (Appendix of the standard). 7.9.7 Cargo suspension device
The top of the insulated container can be designed according to the requirements of hanging cargo. In this case, it shall meet the test requirements listed in 8.8 and shall be marked inside the box to indicate the maximum hanging load value. 7.9.8 Air conditioning box
For those insulated containers that can be conditioned, it will affect human health before proper ventilation. Therefore, signs should be set at all entrances.
8 Tests
8.1 General
8.1.1 Unless otherwise specified, insulated containers that meet the requirements of Chapter 7 should be subjected to the tests specified in 8.2 to 8.18. Except for special provisions and requirements, the refrigeration and/or heating equipment of the insulated container (including its components, unit frames, wall panels, partitions, ventilation ducts and partitions, etc.) may not be installed on the container body during the test. However, in the structural test, if the main components or frames of the refrigeration/heating equipment are not installed on the container body, when the container is used according to the design conditions, the effects of cargo load and/or external forces or acceleration shared by these components should be considered separately. Therefore, when the refrigeration and/or heating equipment is not installed on the container during the structural test and affects the strength and integrity of the insulated container during use, a substitute with equivalent strength should be used instead. The fixing method between the substitute and the container should be the same as the original part, and the strength should not be increased compared with the original part.
The heat leakage test (test 14) of the insulated container is used to determine the heat leakage rate of the container to determine the category of the container. The tests listed in 8.17 and 8.18 (i.e., tests 15a and 15b) respectively specify the standard test methods for the thermal performance of various types of machine-cooled and refrigerant-consuming refrigerated containers. The watertightness test (test 12), airtightness test (test 13), heat leakage test (test 14) and refrigeration performance test (test 15) should be arranged after tests 1 to 11. 8.1.2 The character "\P" is used to represent the maximum load of the insulated container, that is, PR-T
, where: R is the rated mass of the insulated container, that is, the maximum total mass, and T is the mass of the insulated container itself. Note: R, P and T are all expressed in mass units. If the test is required to be carried out with their derived unit gravity, they are all inertial forces and expressed as: Rg, Pg, Tg, with Newton (N) or dry Newton (kN) as units. When the term "load" is used to represent physical quantities, its unit is the same as that of "mass". The term "load loading", such as "internal load", refers to applied force. 8.1.3 The test load or load in the insulated container should be evenly distributed. 8.1.4 The test loads and loads specified in the following tests are minimum requirements. 8.1.5 The dimensional requirements of the insulated container in various tests are as follows: 246
a) Dimensions and technical conditions listed in this standard: b) ISO 668;
c) GB/T 1835.
8.2 Test 1 Stacking test
8.2.1 General
GB/T7392-1998
This test is to verify the load-bearing capacity of the bottom layer of fully loaded insulated containers when there is a misalignment in the stack under the conditions of ocean vessel transportation.
Table 4 specifies the force applied to each pair of top corner fittings and the mass of the stack represented. Table 4 Stacking test force
Test force per box
1AAA.1AA and 1A
1BBB, 1BB and 1B
1CC and 1C
(4 corner fittings evenly distributed)
(762550)
(762550)
(201600)
Test force of each pair of end corner fittings
(381275)
(381275)
( 381275)
(100800)
Mass of pallet in terms of test force
192000
192000
192000
(432290)
(432290)
(112 000)
Note: The test force value of each box is 3392kN. When the 9-layer pallet is suspended, the rated value of each box is 24000kg (52920lb). When the acceleration force is 1.8g, the calculated force value of each corner column is 86400kg (190480 lb). 8.2.2 Method
Place the insulated container under test on four pads at the same level. The pads shall be aligned with each bottom corner fitting and their plane dimensions shall be the same as those of the corner fittings.
The load in the box shall be evenly distributed on the bottom plate so that the sum of its own mass and the test load is equal to 1.8R. The vertical force shall be evenly applied to the four top corner fittings of the box or each pair of top corner fittings at the ends of the box, with the force values shown in Table 4. The force shall be applied through a dummy piece equipped with a GB/T1835 standard corner fitting or with the same bottom geometry as the bottom corner fitting, i.e., with the same external dimensions, chamfers of openings and radii of peripheral corners. The dummy piece shall be designed so that the forces to which the insulated container is subjected during the test are consistent with those when the actual corner fittings are used.
Regardless of the loading method used, the tendency to overturn caused by the plane of force action, i.e., the supporting surface of the box, shall be minimized. Each corner fitting or dummy piece shall be offset in the same direction, with the offset amount being: 25.4mm in the horizontal direction and 38mm in the vertical direction. 8.2.3 Requirements
After the test, the insulated container should not have permanent deformation or abnormality that affects normal use, and its size should still meet the requirements of loading, unloading, securing and reloading operations.
8.3 Test 2 Lifting test by four top corner fittings 8.3.1 General
This test is to verify the bearing capacity of all types of insulated containers except 1D type when they are lifted vertically by four top corner fittings. When verifying the 1D type box, the direction of the lifting force can be any angle between the vertical direction and 60° to the horizontal plane. This is the only way to lift the insulated container by four top corner fittings. This test is also used to verify the ability of the bottom plate and bottom structure of the insulated container to withstand the acceleration caused by the maximum load during the lifting operation.
8.3.2 Method
The load in the insulated container is evenly distributed on the bottom plate, and the sum of its own mass and the test load is equal to 2R. It is lifted steadily from the four top corner fittings at the same time to avoid obvious acceleration or deceleration. 1D type insulated container can be lifted by slings, and each sling should be at an angle of 60° to the horizontal plane. 247
GB/T7392—1998
Hang the insulated container for 5 minutes and then lower it back to its original position. 8.3.3 Requirements
After the test, the insulated container should not have permanent deformation and abnormality that affect normal use, and its size should still meet the requirements of installation, fastening and replacement operations.
8.4 Test 3 Lifting test through four bottom corner fittings 8.4.1 General
This test is to verify the bearing capacity of the insulated container when it is lifted through four bottom corner fittings. The sling is only connected to the four bottom corner fittings and is connected to a crossbeam in the middle above the top of the container. 8.4.2 Method
The load in the insulated container is evenly distributed on the bottom plate, so that the sum of its own mass and the test load is equal to 2R. Lift steadily from the side holes of the four bottom corner fittings to avoid obvious acceleration or deceleration. The angle between the lifting force line and the horizontal plane is as follows: 30° for 1AAA, 1AA and 1A boxes; 37° for 1RBB, 1BB and 1B boxes; 45° for 1CC and 1C boxes; 60° for 1D box.
In any case, the distance between the lifting force line and the outer surface of the corner fitting should not be greater than 38mm. When lifting, the lifting device should only be connected to the four bottom corner fittings.
Hang the insulated container for 5 minutes and then lower it back to its original position. 8.4.3 Requirements
After the test, the insulated container shall not have permanent deformation or abnormality that affects normal use, and its size shall still meet the requirements of loading, unloading, securing and reloading operations.
8.5 Test 4 Longitudinal fastening test
8.5.1 General
This test is to verify the ability of the insulated container to withstand longitudinal fastening when a dynamic load equivalent to 2g acceleration occurs when it is running on the railway.
8.5.2 Method
The load in the insulated container is evenly distributed on the bottom plate, so that the sum of its own mass and the test load is equal to R. It is fastened to the rigid seat through the two bottom holes of the bottom corner pieces at one end of the box. A horizontal force equivalent to 2Rg is applied through the two bottom holes of the bottom corner pieces at the other end, first toward the fixing piece and then in the opposite direction. 8.5.3 Requirements
After the test, the insulated container shall not have permanent deformation or abnormality that affects normal use, and its size shall still meet the requirements of loading, unloading, securing and reloading operations.
8.6 Test 5 End wall strength test
8. 6. 1 General
This test is to verify the ability of the end wall of the insulated container to withstand the dynamic load of 8.5.1. 8.6.2 Method
When one end of the insulated container is closed and the other end is equipped with a door, each end should be tested; when the structures at both ends are symmetrical, only one end can be tested. The test should be carried out under the condition that the end wall is allowed to deform freely, and a uniformly distributed load of 0.4Pg should be applied to the end wall inside the box. 8.6.3 Requirements
After the test, the insulated container should not have permanent deformation or abnormality that affects normal use, and its size should still meet the requirements of loading and unloading, securing and reloading operations.
8.7 Test 6 Side wall strength test
8.7.1 General
GB/T7392--1998
This test is to verify the ability of the side wall of the insulated container to withstand the internal pressure caused by the movement of the ship. 8.7.2 Method
The test should be carried out on both sides of the insulated container. If the structure of the two sides is symmetrical, only one side can be tested. A uniform load of 0.6Pg is applied to the side wall in the box, and the wall and the longitudinal members can deform freely. 8.7.3 Requirements
After the test, the insulated container should not have permanent deformation or abnormality that affects normal use, and the size should still meet the requirements of loading and unloading, fastening and reloading operations.
8.8 Test 7 Top strength test
8.8.1 General
This test is to verify the ability of the top plate of the insulated container to withstand the dynamic load when the staff are working on it. If the box roof is designed for hanging cargo, its load-bearing capacity shall be verified. The maximum value shall be at least 1496kg/m calculated based on the length of the box, and the vertical acceleration of 2g shall be taken into account. 8.8.2 Method
A load of 300kg shall be evenly distributed on an area of 600mm×300mm at the weakest part of the top plate structure of the insulation box for testing. When the top of the insulated container is designed according to the requirements of hanging cargo, the test load should be the larger value of 2 times the design load and \2×1490kg/m×internal available length", and it should be hung on the top of the container in a similar way to normal use. During the test, the container is supported only by four bottom corner pieces. 8.8.3 Requirements
After the test, the insulated container should not have permanent deformation or abnormality that affects normal use, and its size should still meet the requirements of loading and unloading, securing and reloading operations.
8.9 Test 8 Bottom strength test
8.9.1 General
This test is to verify the bottom plate of the insulated container to withstand the load of the loading truck or similar during loading and unloading operations. The ability to withstand concentrated dynamic loads imposed by similar equipment.
8.9.2 Method
The test is conducted using a tire test vehicle with a rear axle load of 5640kg (i.e., 2730kg per wheel). It is stipulated that all contact points between each wheel and the bottom plane of the box fall within a rectangle formed by 185mm (axial) × 100mm, and the tangible contact area shall not exceed 142cm2. The nominal width of the tire is 180mm, and the center distance between the two wheels is 760mm. During the test, the test vehicle moves back and forth on the entire bottom plate surface. At this time, the four bottom corner pieces of the box body are located on supports at the same level, and the bottom structure of the box can be deformed freely. 8.9.3 Requirements
After the test, the insulated container should not have permanent deformation or abnormality that affects normal use, and its size should still meet the requirements of loading, unloading, securing and reloading operations.
8.10 Test 9 Transverse rigidity test
8.10.1 General
This test is to verify the ability of other types of containers except 1D type insulated containers to withstand the transverse push and pull caused by the movement of the ship. 8.10.2 Method
The insulated container is in an empty container (T) state, with its four bottom corner pieces placed on four supports at the same level, and through the fixing device through the bottom holes of the four bottom corner pieces, it is in a transverse and vertical fastening state. The transverse fastening is only applied to the bottom corner piece at the same end opposite the force-applying top corner piece. If the two ends are tested separately, the vertical fastening is only applied to one end of the test. Apply a force of 150kN to each corner fitting on one side of the box, either separately or simultaneously, with the line of force applied parallel to the bottom structure and end wall of the box, first toward the corner fitting, then in the opposite direction. If the two end structures of the insulated container are the same, only one end needs to be tested; if the two end structures are asymmetrical about their vertical axis, both sides should be tested.
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