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CR Classification Society
RULES FOR THE CONSTRUCTION AND CLASSIFICATION OF FREIGHT CONTAINERS 2017
 
Chapter 1 General
1. Application
The Rules for the Construction and Certification of Freight Containers(hereinafter referred to as “the Rules”) apply to containers complying with the International Standards ISO Series 1 Freight containers. Non-ISO containers or containers of special types not fully covered in the Rules are to be specially considered.
When authorized by an Administration, which is a signatory to the International Convention for Safe Containers(CSC), and upon request, the certification procedure may be extended and containers surveyed for compliance with the provisions of the convention, and certified thereto in the manner prescribed.
 
2. Definitions
Terms and symbols used in the Rules are defined as follows unless otherwise specially provided:
  (a) Maximum operating gross mass or Rating R, is the maximum allowable sum of the mass of the container and its cargo (unit:kg). Gravitational force derived from this value is indicated as Rg (unit:N; g=9.8m/s2).
  (b) Tare, T, is the mass (unit:kg) of the empty container.
  (c) Maximum permissible payload, P, is the difference mass between R and T (unit:kg). Gravitational force derived from this value is indicated as Pg (unit:N; g=9.8m/s2).
  (d) Overall external dimensions are the maximum external dimensions of the container including any permanent attachments, and are designated by H, W and L (unit:mm) respectively.
  (e) Internal dimensions are the minimum internal dimensions of the container including any permanent attachments except top corner fittings.
Container types are grouped according to the mode of transport, categories of cargo and the physical characteristics of the container and can be grouped into General cargo container, Specific cargo container(including thermal container, tank container, dry bulk container, and named cargo type container).

Chapter 2 Certification
1. Containers intended to be certified by the Society are to be designed, manufactured, approved, tested and inspected in compliance with requirements of the Rules, unless otherwise specially specified. Containers are to be manufactured at the works which have been approved by the Society. Prior to the submission of containers for certification, the manufacturer is to provide the Society with design details of containers for approval and to obtain a type approval certificate of the design type series container issued by the Society upon satisfaction of prototype tests and inspections.
2. For a type of container designed and constructed to other standards than the Rules or a type of container has been approved by other recognized organizations, type approval for such types of container may be accepted subject to the special consideration and approval by the Society in each case.
3. Production units of approval type series container intended for certification by the Society are to be subjected to a satisfactory test and inspection witnessed by the Surveyor at proper stages during construction in compliance with the relevant requirements given in the Rules.
4. For works approval, the manufacturer is to submit the following documents concerning the production of containers for approval by the Society in satisfactory manner:
 
(a) Outline of works.
(b) Container manufacturing procedure.
(c) Main facilities for the production.
(d) Facilities for tests and inspections.
(e) Manufacturer’s standards for inspection the process of quality control.
(f) Other documents as required by the Society.
5. Each design type container proposed for type approval is to comply with the relevant requirements concerning structural arrangements, scantlings, materials and workmanship etc. given in the Rules. The manufacturer is to submit the following design plans and documents to the Society for approval before the construction of the prototype unit is commenced:
 
(a) General arrangement and specification.
(b) Structural drawing showing materials, scantlings and structural details.
(c) Test and inspection procedures.
(d) Other documents as required by the Society.
 
Chapter 3 Design
Overall external dimensions of all ISO series 1 freight containers have a unifying nominal width of 8 ft (2,438mm). Those designated by a single letter have a nominal height of 8 ft (2,438mm); those which have a double letter have a height of 8.5 ft (2,591mm); and those designated by X indicates that the height of the container is between 0 and 8 ft (2,438mm). Containers designated by A have a nominal length of 40 ft (12m), B 30 ft (9m), C 20 ft (6m), D 10 ft (3m).
E.g., 1BB represents ISO Series 1 container, 30 ft in length, 8.5 ft in height, 8 ft in width.
Materials used for strength structures of containers are to be in compliance with the appropriate recognized material standard or, if applicable, the requirements given in Part XI of the “Rules for the Construction and Classification of Steel Ships” (hereinafter referred to as “Rules for Steel Ships”). Sufficient information of materials containing manufacturing procedures, grades, mechanical properties, the chemical composition, heat treatments, etc. are to be submitted to the Society for approval.
 
Chapter 4 Tests and Inspections
1. Tests and inspection requirements given hereunder are generally applied to general cargo containers, thermal containers and tank containers unless otherwise specified. Requirements for containers of special type, purpose or feature may be modified or specially considered at the prescription of the Society.
2. Measuring instruments to be used for tests and inspections are to be calibrated.
3. Materials used in the construction of containers are to comply with the approved design specification of containers.
4. For materials of strength structures and corner fittings, the manufacturer is to provide the Surveyor with mill sheets containing the information of dimensions, quantity, charge and piece numbers, grades, mechanical properties, chemical compositions, conditions of heat treatment, etc. Testing for such materials at mills may be required to carry out in the presence of the Surveyor as deemed necessary by the Society.
5. Tests and Inspections for Container Construction
 
(a) Visual inspections.
(b) Dimensional checks.
(c) Mass measurement.
(d) Weathertightness tests.
(e) Strength tests.
(f) Strength tests with one door off operation.
 
Chapter 5 General Cargo Containers
1. The prototype unit of general cargo container type approval is to be subjected to all tests and inspections stated in the previous chapter.
2. Production units of approved type series general cargo contianers are to be subjected to following tests and inspections :
 
(a) Visual inspection, dimensional check and weathertightness test for each container.
(b) Weighing for containers of a certain number accepted by the Society.
(c) Strength tests containing stacking, top lifting, bottom lifting and floor strength tests for one container selected at random from each 50 containers or fraction thereof in same series.
 
Chapter 6 Thermal Containers
1. When thermal containers are intended to be certified, the following plan and data are to be submitted in addition to those prescribed in Chapter 2 of the Rules.
 
(a) Insulation construction (including material of insulation, data of heat transmission and details of insulating work).
(b) Ventilating devices and drainage.
(c) Specification of refrigerating unit and/or heating equipment (if provided).
(d) Thermometers and temperature recording arrangements.
2. Prototype units of thermal container type approval are to be subjected to following test and inspections.
 
(a) Items for prototype general cargo containers as required in Chapter 5 of the Rules.
(b) Roof strength test for hanging cargo (if any).
(c) Airtightness test.
(d) Thermal insulation test.
(e) Performance test of refrigerating.
3. Production units of approved type series thermal container are to be subjected to following tests and inspections.
 
(a) Items for production units of general cargo container as required in Chapter 5 of the Rules except the floor strength test.
(b) Airtightness test.
(c) Thermal insulation test for one container selected at random from each 100 containers or fraction thereof in same series.
(d) Operation test for refrigerating and/or heating appliances.
 
Chapter 7 Tank Containers
1. When tank containers are intended to be certified, the following plan and data are to be submitted in addition to those prescribed in Chapter 2 of the Rules.
 
(a) Specifications of the tank.
(b) Drawings showing full details of materials, scantlings and welding procedures of the tank.
(c) Arrangement and full details of valves, nozzles and other fittings.
(d) Full details of pressure relief devices.
2. Prototype units of tank container type approval are to be subjected to following test and inspections :
 
(a) Visual inspection, dimensional check and weighing in compliance with the requirements given in Chapter 4 of the Rules.
(b) Strength tests.
(c) Hydrostatic test.
(d) Strength test for walkways and ladders.
(e) Working test.
3. Production units of approval type series tank container are to be subjected to the following tests and inspections :
 
(a) Visual inspection and dimensional check in compliance with the requirements given in Chapter 4 of the Rules for each container.
(b) Weighing for containers of a certain number accepted by the Society.
(c) Strength tests containing stacking, top lifting and bottom lifting tests for one container selected at random from each 50 containers or fraction thereof in same series.
(d) Hydrostatic tests.
 
Chapter 8 Identification and Marking
1. Each container is to be permanently marked with following information :
 
(a) Owner’s mark and serial number.
(b) Manufacturer’s mark and serial number.
(c) Type and/or model.
(d) Maximum operating gross mass.
(e) Tare.
(f) Date of manufacture.
2. Each container which is satisfactorily surveyed by the Society is to be stamped on the vertical face of the lower sill at the door end with the Society’ mark, certificate number and date of survey as follows :
CR(steel stamp) xx-xx-xx
The letters are not to be less than 6mm high and be placed at about the middle of the sill length.
3. An emblem of 150mm diameter as shown in Fig. 8-1 supplied by the Society is to be affixed to each container which is satisfactorily surveyed by the Society.
   
 
 
Fig. 8-1 Survey Emblem of the Society
   
4. For thermal containers provided with refrigerating units, the following items are to be indicated :
 
(a) Type of refrigerating units, date of manufacture and kind of refrigerant.
(b) Output and revolution of the electric motor for refrigerant compressor.
(c) Rated voltage, frequency and number of phase of the electric motor for refrigerant compressor.
(d) Type of electric source.
(e) Full load current and total starting current.
(f) Minimum internal temperature and ambient temperature.
5. Where thermal containers are provided with cargo hanging arrangements, the maximum service load is to be marked at easily visible position on the internal wall of the container.
6. For tank containers, the following data are to be marked additionally :
 
(a) Total capacity
(b) Maximum allowable working pressure.
(c) Date of hydrostatic test.
(d) Test pressure.
7. According to the International Standard ISO/IS 790 (Marking of Series 1 freight containers), the required markings are shown in Fig. 8-2.
   
 
 
Fig. 8-2 Container Marking
1. Owner code, serial number and check digit
2. Country code, size and type code
3. Maximum gross and tare mass (kg and lb)
   
8. “Safety Approval Plate” for International Convention for Safe Containers are shown in Fig. 8-3.
 
(a) The Plate is to be permanent, noncorrosive and fire proof and is to be permanently affixed to the container.
(b) The words “CSC SAFETY APPROVAL” are to have a minimum letter height of 8mm and all other words and numbers a minimum height of 5mm. They are to be stamped into, embossed on or indicated on the plate surface in any other permanent and legible way.
   
 
 
Fig. 8-3 CSC Safety Approval Plates
1. Country of Approval and Approval Reference as given in the example on line 1. (The country of Approval is to be indicated by means of the distinguishing sign used to indicate country of registration of motor vehicles in international road traffic).
2. Date (month and year) of manufacture.
3. Manufacturer’s identification number of the container, or in the case of existing containers for which that number is unknown, the number allotted by the Adminidtration.
4. Maximum Operating Gross Mass (kg and lb).
5. Allowable Stacking Load for 1.8g (kg and lb).
6. Transverse Racking Test Force (newtons).
7. End Wall Strength to be indicated on plate only if end walls are designed to withstand a load of less or greater than 0.4 times the gravitational force by maximum permissible payload, i.e. 0.4 Pg.
8. Side Wall Strength to be indicated on plate only if side walls are deigned to withstand a load of less or greater than 0.6 times the gravitational force by maximum permissible payload, i.e. 0.6 Pg.
9. First maintenance examination date (month and year) for new containers and subsequent maintenance examination dates (month and year) if Plate used for this purpose.
10. One door off stacking strength to be indicated on plate only if the container is approved for one door off operation. The marking shall show :
  ALLOWABLE STACKING LOAD ONE DOOR OFF FOR 1.8g (…kg…lb). This marking shall be displayed immediately near the stacking test value (see line 5).
11. One door off racking strength to be indicated on plate only if the container is approved for one door off operation. The marking shall show :
  TRANSVERSE RACKING TEST FORCE ONE DOOR OFF (…newtons). This marking shall be displayed immediately near the racking test value (see line 6).
 
Chapter 9 Condition and Repair Surveys
1. Repair Procedures
 
(a) All container are to be examined generally internally and externally for condition of structures, welds, rivets, panels, floor, door gaskets and closing devices. Corrective action is to be taken regarding damages before the container is returned to service.
(b) All materials used for repairs are to be the same with or to be equivalent to original construction. Suitable check is to be applied to ensure proper materials as necessary.
(c) Repairs are to be carried out in accordance with manufacture’s specifications or repair manual in so far as practicable. All welding is to be done by qualified welders.
2. Testing
 
(a) The repair facility is to be capable of conducting partial structure tests to the load requirements of the Rules. Partial testing is required after replacement or major repair to corner fittings or corner posts.
(b) Tightness testing using water, light or smoke is to be done on all containers repaired where tightness is applicable.
(c) Dimensional checks are to be done as necessary.
(d) Additional testing may be required if the load carrying capacity of the container is in question.
3. Certification
 
(a) After repair and satisfactory survey, a certificate is to be issued to the user and a decalcomania with the month and year of survey is to be affixed to the container.
(b) After periodic condition surveys required for compliance with International Regulations, certification for safety in handling and fitness for continuance in service is to be provided as necessary.