Chapter 7 Tank Containers
7.3 Tanks and Fittings
7.3.1 Each tank or tanks are to be effectively secured to structural elements of the tank framework and to be capable of being filled and emptied without removal from the tank container.
7.3.2 Tanks or tank compartments without vacuum relief devices are to be designed to withstand an external pressure of at least 0.04 MPa above the internal pressure without permanent deformation.
7.3.6 Pressure relief devices are to have a minimum relief capacity specified in the following table:
ContainerDesignation Minimum Pressure Relief Capacity (m3/min)
7.3.7 Each pressure relief device is to be plainly and permanently marked with the pressure at which it is set to operate.
7.3.8 When a vacuum relief device is required, it is to be designed to prevent permanent deformation of the tank or tank compartments caused by external pressure.
7.3.9 Each tank is to be provided with manholes or other openings of a minimum diameter of 450 mm for inspections, maintenance and repairs.
7.3.10 Gauging devices which may be in direct communication with the contents of the tank are not to be made of glass or of other fragile material.
7.3.11 When insulation is required, the design and construction are to be such that the insulation may in no way interfere with the proper function of the tank fitting.
7.3.12 When heating or refrigeration provisions are required, suitable operational safeguards having regard to the avoidance of the development of excessive temperatures and stresses are to be provided.
7.4 Materials and Workmanship
In addition to the requirements given in 3.3 of the Rules, the following requirements are to be applied to the tank containers.
7.4.1 Materials selected for the tank are not to cause a dangerous reaction when in contact with the contents.
Allowance for corrosion is to be taken into consideration.
7.4.2 Materials are to be suitable for the environmental conditions under which the container is operated. The minimum temperature range over which materials are suitable is to be 10C and 50C.
7.4.3 Welding and preparing works for tanks are to be carried out in accordance with the relevant requirements for pressure vessels, when the tank is defined as a pressure vessel.
7.5 Tests and Inspections
7.5.1 Prototype containersPrototype units of tank container type approval are to be subjected to following tests and inspections:
(a) Visual inspection, dimensional check and weighing in compliance with the requirements given in 4.3 of the Rules.
Table 7-2
Strength Test of Tank Containers
Tests Test Procedures Measurements
Stacking As specified in Table 4.1
Internal loading need not be provided during test.
As specifie din Table 4.1.
Internal loading: R-T, uniformly distributed over the end.
Application: The container is to be positioned with its longitudinal axis vertically and supported by four bottom corner fittings for 5 minutes.
Any distress due to the test is to be recorded
Lateral inertia
Internal loading: R-T, uniformly distributed over the side.
Applicaiton: The container is to be positioned with its transverse axis vertically and supported by four bottom corner fittings for 5 minutes.
Any distress due to the test is to be recorded
(b) Strength tests in compliance with 7.5.2 of the Rules.
(c) Hydrostatic test in compliance with 7.5.3 of the Rules.
(d) Strength test for walkways and ladders in compliance with 7.5.4 of the Rules.
(e) Working test in compliance with 7.5.5 of the Rules.
7.5.2 Strength tests
(a) Strength tests are to be carried out as specified in Table 7-2 after completion of all the works.
(b) The internal loading is to be obtained by filling the tank and a supplementary external loading may be provided, when necessary, in order to achieve the specified loading. The test loading thus applied is to be such as to simulate uniform loading.
(c) The test pressure is to be measured at the top of the tank in its normal position. The test pressure is to be maintained for at least 30 minutes.
(d) Relief devices, where fitted, are to be rendered inoperative or removed.
(e) Where the tank is subdivided into compartments, in addition to the overall test, a h ydrostatic test oneach compartment is to be carried out with contiguous compartments being empty.
(f) During the test, tank boundaries together with associated fittings are to be free from leakage and permanent deformation; container structures are to reveal neither permanent deformation nor any abnormality.
7.5.4 Strength tests for walkways and ladders
(a) A load of 3 kN is to be uniformly distributed over an area of 600 mm300 mm at the weakest section of the walkway.
(b) A load of 2 kN is to be applied on the center of the widest rung of the ladder.
(c) The maximum deflection and permanent set under test are to be measured.
7.5.5 Working tests
On tank containers fitted with pressure relief devices, a working test is to be carried out to ascertain their ef ficiency.
7.5.6 Production units
Production units of approved 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 4.3 of the Rules f or 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 in compliance with the requirements given in 4.3 of the Rules for one container selected at random from each 50 containers or fraction thereof in same series.
(d) Hydrostatic tests in compliance with 7.5.3 of the Rules for each container.
Chapter 8
Identification and Marking
8.1 General
8.1.1 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.
8.1.2 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’s mark, certificate number and date of survey as follows:
xx xx xx
The letters are not to be less than 6 mm high and be placed at about the middle of the sill length.
8.1.3 An emblem of 150 mm 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.
8.1.4 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.
8.1.5 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.
8.2 International Standard and Conventional Requirements
8.2.1 According to in International Standard ISO/IS 790 (Marking of Series 1 freight containers), the required markings are shown in Fig. 8-2.
8.2.2 “Safety Approval Plate” for International Convention for Safe Containers are shown in Fig. 8-3.
(a) The Plate is to be permanent, non-corrosive 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 8 mm and all other words and numbers a minimum height of 5 mm. They are to be stamped into, embossed on or indicated on the plate surface in any other permanent and legible way.
Fig. 8-1
Survey Emblem of the Society
1. Owner code, serial number and check digit 2. Country code, size and type code
3. Maximum gross and tare mass (kg and lb)
Fig. 8-2
Container Marking
1. Country of Approval and Approval Reference as given in the example on line 1. (The country of App roval 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 Administration.
4. Maximum Operating Gross Mass (kg and lb).
5. Allowable Stacking Load for 1.8 g (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. 0.4Pg .
8. Side Wall Strength to be indicated on plate only if side walls are designed to withstand a load of less or greater than 0.6 times the gravitational force by maximum permissible payload, i.e. 0.6Pg.
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).
Fig. 8-3
CSC Safety Approval Plates
Chapter 9
Condition and Repair Surveys
9.1 General
9.1.1 The following provisions are the procedure for containers to be surveyed, repaired and tested in appropriate repair facilities and certified for continued service.
9.2 Repair Procedures
9.2.1 All containers 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.
9.2.2 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.
9.2.3 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.
9.3 Testing
9.3.1 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.
9.3.2 Tightness testing using water, light or smoke is to be done on all containers repaired where tightness is applicable.
9.3.3 Dimensional checks are to be done as necessary.
9.3.4 Additional testing may be required if the load carrying capacity of the container is in question.
9.4 Certification
9.4.1 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.
9.4.2 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.