Dutch Pressure Vessel Test

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Dutch pressure vessel test: UN Series E, Test E.2

For the test, the test substance is heated in a pressure vessel, which is closed using aperture discs with orifices of various diameters. The pressure vessel also has a bursting disc, rated to burst at 620 ± 60 kPa. This method is used to determine whether the substance can decompose itself under intense heat.

The apparatus consists of a pressure vessel with orifice plate and bursting disc, which is inserted into a heating and protection device (Figure 1).

Result Classification according to UN Test E.2
Rupture of the disc with an orifice of 9.0 mm or greater and a sample mass of 10.0 g. “Violent”
No rupture of the disc with an orifice of 9.0 mm but rupture of the disc with an orifice of 3.5 mm or 6.0 mm and a sample mass of 10.0 g. “Medium”
No rupture of the disc with an orifice of 3.5 mm and a sample mass of 10.0 g but rupture of the disc with an orifice of 1.0 mm or 2.0 mm and a sample mass of 10.0 g or rupture of the disc with an orifice of 1.0 mm and a sample mass of 50.0 g. “Low”
No rupture of the disc with an orifice of 1.0 mm and a sample mass of 50.0 g. “No

Figure 1: Apparatus for testing the sensitivity of substances to intense heat under defined confinement (UN Manual, page 263)

(A)    Bursting disc
(B)    Nozzle plate
(C)    Sample (10 g or 50 g)
(D)    Teclu burner
(E)    Pressure vessel with an inner diameter of 50 mm and an inner height of 94.5 mm