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3.2.2 Integrity of test enclosure
The test enclosure is to be nominally leak tight when doors and hatches are closed. The integrity of seals on doors, hatches, and other penetrations (e.g., instrumentation access ports) must be verified before each test.
3.2.3 Engine mock-up
.1 An engine mock-up of size (width x length x height) 1 m x 3 m x 3 m should be constructed of sheet steel with a nominal thickness of 5 mm. The mock-up should be fitted with two steel tubes diameter 0.3 m and 3 m length that simulate exhaust manifolds and a solid steel plate. At the top of the mock-up a 3 m2 tray should be arranged. See figures 1,2 and 3.
.2 A floor plate system 4 m x 6 m x 0.75 m high shall surround the mock-up. Provision shall be made for placement of the fuel trays, described in table 1, and located as described in table 2.
3.2.4 Instrumentation
Instrumentation for the continuous measurement and recording of test conditions should be employed. The following measurements should be made:
.1 temperature at three vertical positions (e.g., 1,2.5, and 4.5 m)
.2 enclosure pressure
.3 gas sampling and analysis, at mid-room height for oxygen, carbon dioxide, carbon monoxide, and relevant halogen acid products, e.g., hydrogen iodide, hydrofluoric acid, hydrochloric acid
.4 means of determining flame-out indicators
.5 fuel nozzle pressure in the case of spray fire
.6 fuel flow rate in the case of spray fires
.7 discharge nozzle pressure
3.2.5 Nozzles
3.2.5.1 For test purposes, nozzles should be located within 1 m of the ceiling.
3.2.5.2 If more than one nozzle is used they should be symmetrically located.
3.2.6 Enclosure temperature
The ambient temperature of the test enclosure at the start of the test should be noted and serve as the basis for calculating the concentration that the agent would be expected to achieve at that temperature and with that agent weight applied in the test volume.
