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A compressed length of 100 mm is cut from a new compressed duct. This test specimen is placed in a suitable testing device to restrain the two extremities and subjected to a constantly increasing test load perpendicular to the axial direction and evenly distributed along its entire length, until the deformation in the direction of the load is equal..

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The two extremities of the test element shall be extended to receive an end cap for which the fixingelements shall not exceed 50 mm at each extremity.The compressed reference test element shall be placed horizontally and fixed at one end. The otherend shall be subject to a load specified by the manufacturer but not exceeding the yield load specifie..

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The reference test element shall be placed in a straight line on a smooth, horizontal table surface in such a way that one end of the duct extends 500 mm beyond the edge of the table. The part of the duct lying on the table shall be restrained on the top along its whole length. The sag is obtained by measuring the angle between the projected line o..

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The test element shall be secured between the formers so that at least 200 mm of the elementprojects below the base of the formers, and the length above is sufficient to bend over the formers.The free upper length of the element shall be bent at a rotational speed of 12 rpm through an angle of180° over one former then the other, which means within ..

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The reference test element shall be fitted with two end caps which are attached to a stationary fixturewhich maintains the duct at its nominal length. A plate of 2000 mm diameter is positioned in themiddle and subject to the procedure specified in 5.8.1...

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5.8.1 Positive pressureThe reference test element shall be placed horizontally with each end of the sample sealed to beairtight by any means consistent with the use of the material under test. An end cap shall then beconnected to a positive source of pressure.The element shall be subject to the test procedure as specified in Table 4 with ps eq..

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The reference test element shall be placed horizontally with two end caps sealed. The test apparatuscomprises an air supply with variable air flow rate, an air flow meter and a pressure gauge meter asshown in Figure 4. The air flow capacity shall be sufficient to maintain the required pressure levelsspecified in Table 5.The test pressure shall be m..

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