Crushing Test for Cylinder
1. Scope
This guideline specified the crushing test requirement and method for fire extinguisher cylinder, and is suitable to the
crushing flatten test for the cylinder designed and manufactured as per EN3-3
2. Sample
One cylinder shall be taken from the beginning of each manufacturing lot and one from every 1000 afterwards for the
crushing test;
3.Test Equipment and Fixture
3.1 A hydraulic pressing machine, to fulfill the crushing test;
3.2 One set of the crushing test fixture, I.e. two 60 deg. Wedge block of diameter DB=D+/-20mm.
4. Crushing Test
4.1 Check if the hydraulic pressing machine is in good condition, adjust the up/down speed to 150 mm (5.9") /min.
4.2 Install the 60 deg. Wedge blocks onto the pressing machine, adjust and make the blocks parallel to each other,
and centerline of the top block shall be in the place of the certerline of the bottom block and in the same plane.
4.3 Set the cylinder between test blocks, the longitudinal axis of the cylinder shall be vertical to the block wedges,
4.4 Start the hydraulic pressing machine, press the cylinder until the distance between outside surfaces of the
cylinder is less than 20mm (0.79")which is guarantied by the fixture within a period of 30 to 60 seconds.
5. Evaluation
If crushed the cylinder to the requirement, there shall be no cracks on the body of the cylinder. Otherwise the whole
lot represented will be rejected;
6. Record the test result.
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