Stacking test

Applicability

For all types of IBC which are designed to be stacked on each other, as a design type test.

Preparation of the IBC for test

The IBC shall be filled to its maximum permissible gross mass. If the specific gravity of the product
being used for testing makes this impracticable, the IBC shall additionally be loaded so that it is tested
at its maximum permissible gross mass the load being evenly distributed.

Method of testing

(a) The IBC shall be placed on its base on level hard ground and subjected to a uniformly
distributed superimposed test load (see 6.5.6.6.4). For rigid plastics IBCs of type 31H2 and
composite IBCs of types 31HH1 and 31HH2, a stacking test shall be carried out with the
original filling substance or a standard liquid (see 6.1.6) in accordance with 6.5.6.3.3 or
6.5.6.3.5 using the second IBC in accordance with 6.5.6.2.2 after the preliminary storage. IBCs
shall be subjected to the test load for a period of at least:
(i) 5 minutes, for metal IBCs;
(ii) 28 days at 40 ºC, for rigid plastics IBCs of types 11H2, 21H2 and 31H2 and for
composite IBCs with outer casings of plastics material which bear the stacking load
(i.e., types 11HH1, 11HH2, 21HH1, 21HH2, 31HH1 and 31HH2);
(iii) 24 hours, for all other types of IBCs;
(b) The load shall be applied by one of the following methods:
(i) one or more IBCs of the same type filled to the maximum permissible gross mass
stacked on the test IBC;
(ii) appropriate weights loaded on to either a flat plate or a reproduction of the base of the
IBC, which is stacked on the test IBC.

Calculation of superimposed test load

The load to be placed on the IBC shall be 1.8 times the combined maximum permissible gross mass of
the number of similar IBCs that may be stacked on top of the IBC during carriage.

Criteria for passing the test

(a) All types of IBCs other than flexible IBCs: no permanent deformation which renders the IBC
including the base pallet, if any, unsafe for carriage and no loss of contents;
(b) Flexible IBCs: no deterioration of the body which renders the IBC unsafe for carriage and no
loss of contents.

Leakproofness test

Applicability

For those types of IBC used for liquids or for solids filled or discharged under pressure, as a design
type test and periodic test.

Preparation of the IBC for test

The test shall be carried out before the fitting of any thermal insulation equipment. Vented closures
shall either be replaced by similar non-vented closures or the vent shall be sealed.

Method of testing and pressure to be applied

The test shall be carried out for a period of at least 10 minutes using air at a gauge pressure of not less
than 20 kPa (0.2 bar). The air tightness of the IBC shall be determined by a suitable method such as
by air-pressure differential test or by immersing the IBC in water or, for metal IBCs, by coating the
seams and joints with a soap solution. In the case of immersing a correction factor shall be applied for
the hydrostatic pressure.

Criterion for passing the test

No leakage of air.

Internal pressure (hydraulic) test

Applicability

For those types of IBCs used for liquids or for solids filled or discharged under pressure, as a design
type test.

Preparation of the IBC for test

The test shall be carried out before the fitting of any thermal insulation equipment. Pressure-relief
devices shall be removed and their apertures plugged, or shall be rendered inoperative.

Method of testing

The test shall be carried out for a period of at least 10 minutes applying a hydraulic pressure not less
than that indicated in 6.5.6.8.4. The IBCs shall not be mechanically restrained during the test.
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