Thermal sensitivity EG A.14. UN Series 1/Series 2, Test 1 (b)/Test 2 (b): Koenen test and Series E, Test E.1: Koenen test

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Thermal sensitivity EG A.14. UN Series 1/Series 2, Test 1 (b)/Test 2 (b): Koenen test and Series E, Test E.1: Koenen test

For the test, the test substance is heated in a steel tube which is closed by orifice plates with holes of different diameters. This test is used to determine whether the substance is liable to explode under conditions of intense heat and defined confinement.

The apparatus consists of a non-reusable steel tube with its re-usable closing device, installed in a heating and protective device.

Each tube is deep-drawn from sheet steel (see Appendix) and has an internal diameter of 24 mm, a length of 75 mm and wall thickness of 0.5 mm. The tubes are flanged at the open end to enable them to be closed by the orifice plate assembly. This consists of a pressure-resistant orifice plate, with a central hole, secured firmly to a tube using a two-part screw joint (nut and threaded collar). The nut and threaded collar are made from chromium-manganese steel which is spark-free up to 800 °C. The orifice plates are 6 mm thick, made from heat-resistant steel, and are available with holes in a range of diameters.

The test result is considered positive if an explosion occurs at least once in any of the tests with the specified shock apparatus (3 parts).

Apparatus for testing thermal sensitivity from Regulation Figure 1a Steel tube and screw connection
Figure 1a: Steel tube and screw connection

(1)    Tube

(1a)  Outer flange

(2)    Threaded collar

(3)    Orifice plate = 2.0 or 6.0 diameter

(4)    Nut b = 10.0 or 20.0 mm diameter

(5)    Beveled surface

(6)    2 flats for size 41 spanner

Apparatus for testing thermal sensitivity from Regulation Figure 1b Heating and protective device
Figure 1b: Heating and protective device

(7)    2 flats for size 36 spanner

(8)    Fragment-proof box

(9)    2 holding rods for tubes

(10)  Tubes, mounted

(11)   Position of rear burner; other burner visible

(12)   Lure flame

Apparatus for testing thermal sensitivity from Regulation Figure 1a Steel tube and screw connection
Figure 1a: Steel tube and screw connection
Apparatus for testing thermal sensitivity from Regulation Figure 1b Heating and protective device
Figure 1b: Heating and protective device

(1)    Tube

(1a)  Outer flange

(2)    Threaded collar

(3)    Orifice plate = 2.0 or 6.0 diameter

(4)    Nut b = 10.0 or 20.0 mm diameter

(5)    Beveled surface

(6)    2 flats for size 41 spanner

(7)    2 flats for size 36 spanner

(8)    Fragment-proof box

(9)    2 holding rods for tubes

(10)  Tubes, mounted

(11)   Position of rear burner; other burner visible

(12)   Lure flame

Apparatus for testing thermal sensitivity from Regulation Fragment images
Apparatus for testing thermal sensitivity from Regulation Fragment images