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Testing for leaks in the 1936 pre-series models of the Wehrmacht Kanister

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The validation of the sealing is performed by turning on cans water pressure and gives the following results (we will keep the german unit atü is 0,99 bar) :

- 0,3 to 0,5 atü : no deformation is observed,

- 1 atü : the upper portion of the sidewalls under the seat of the handle grows about 5 mm,

- 2 atü : the deformation of the flanks becomes uniform and reaches the base of the handle,

- 3 atü : the swelling increases to a width of 215 mm, the gutters and the expansion rib are impacted, four bumps are formed at the lower corners and the first leakage is detected on the welds.

- 5 atü : some folds appear on the sides of the handle welds, the cap remains tight despite the deformation of its base and the maximum swelling, 260 mm, increases the useful volume of about 6 liters.

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Pre-serie models of 1936, notice the tear of several centimeters of the weld on the rear side and the different deformations described above (Schwelmer Eisenwerk Albano-Müller Archives).

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Technical drawing sized of the pressurizing deformations at 1, 3 and 5 atü dated of 1936 september. Note the location of folds (Falten) and bumps (Beulen) and the annotation estimating the increase in the volume of about 6 liters on the can tested to 5 atü (Schwelmer Eisenwerk Albano-Müller Archives).

Some french oil magnates, fuel dealers and garages swell voluntarily some Kanister and other Jerrycans after war to increase the useful volume of cans. (Frederic Charrier collection).

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