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CR Classification Society
Volume 7
Rules for the Construction and Classification of Freight Containers 1997

Chapter 1 General
1. Application
The freight containers defined in the Rules refer to those complying with the International Standards ISO Series 1 Freight Containers. That is, the containers with standard dimensions have met the requirements of the International Standards Organization. Freight containers not stated by the International Standards Organization or freight containers with special design which are not covered by the Rules shall be given separate consideration. In addition, freight containers shall comply with the requirements of the International Convention for Safe Containers.
2. Definition
R: Maximum gross weight T: Tare weight P: Maximum cargo weight H: Height W: Width L: Length

Container types are categorized into General cargo containers and Specific cargo containers. Specific containers include refrigerated containers, tank containers, etc. This part covers primarily dry bulk containers and refrigerated containers.

Chapter 2 Certification
1. The manufacturer of containers shall be approved by this Society.
2. Each design type container shall be subject to type approval. Type approval certificates issued by other recognized organizations may be accepted subject to special consideration by this Society.
3. All containers shall be subject to inspections and certification. However, we accept manufacturers’quality assurance system. They may carry out inspections by themselves.
4. The following documents shall be submitted for works approval:
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 and process of quality control
5. The following documents shall be submitted for type approval:
a. General arrangement and specifications
b. Structural drawing showing materials, scantlings and structural details.
c. Test and inspection procedure

Chapter 3 Fittings
1. According to the requirements of ISO, containers designated by A have a nominal length of 40 ft, B 30 ft, C 20 ft, D 10ft. 1A is 8 ft in height, 1AA 8.5 ft, and 1AAA 9 ft. The width is 8 ft.
E.g., 1BB represents ISO Series 1 container, 30 ft in length, 8.5 ft in height, 8 ft in width. The materials used by containers, such as cast steel, shape steel and steel plate, shall comply with the requirements in Part 7 of the Rules for Steel Ships –Materials.

Chapter 4 Test and Inspection
1. Test instruments shall be calibrated.
2. Mill sheets for steel shall be provided.
3. Insulating materials shall comply with a recognized standard.
4. There are three kinds of inspections: visual inspection, dimensional check and weighting, and two kinds of tests: watertightness test and strength test. A water- tightness test can be carried out by means of the hose test. The strength test consists of the following 12 tests:
a. Stacking test
b. Top lifting test
c. Bottom lifting test
d. Lifting from fork lift pockets test
e. Lifting from grappler-arm test
f. Side wall strength test
g. End wall strength test
h. Bottom strength test
i. Roof strength test
j. Longitudinal restraint static test
k. Longitudinal racking test
l. Transverse racking test

Chapter 5 Dry Cargo Container
Test and inspection after type approval: All tests and inspections stated in the previous chapter shall be conducted. Test and inspection of production units: A visual inspection, dimensional check and hose test shall be conducted for each container. For weighing , a random selection for inspection will be sufficient. For strength test, only a stacking test, a bottom lifting test, and a bottom strength test are required to be conducted, and only one container randomly selected from every 50 is required to be inspected.

Chapter 6 Refrigerated Container
Test and inspection after type approval: In addition to all tests and inspections required for dry cargo containers, the following four tests shall be completed:
a. Top lifting strength test inside the container
b. Airtightness test
c. Thermal insulation test
d. Refrigerating machine performance test

Test and inspection of production units: Except for the bottom strength test, all items required for dry cargo containers shall be completed, and the following tests shall be added:
a. Airtightness test: If the airtightness test for the first 3 containers is completed with satisfactory results, such test for the remaining containers may be carried out on one of every 10 containers.
b. Thermal insulation test: A thermal insulation test may be carried out on one of every 100 containers.
c. Refrigerating machine operation test

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