ISO 7840：1994(E)
添付資料-1：ISO7840：1994(E) Annex A
Annex A (normative)
Fire test
A.1 Principle and requirement
The hose filled with heptane is subjected to fire. The hose shall with stand the test for 2,5 min without leakage,after ignition of the fuel in the tray.
A.2 Sampling
At least three hose samples shall be tested in turn.
A.3 Equipment
The test shall be performed indoors in a sheltered area free from draught at a temperature of + 20℃ ± 5℃. The test equipment shall be designed to conform to that as shown in figure A.1. The fuel tray shall be square, 350mm x 350 mm, with vertical sides. Commercial heptane with a distillation interval of 80℃ to l10℃ is used as fuel. The fuel and water temperature shall be+ 20℃ ± 2℃.
A.4 Test procedure
A.4.1 Preparation
Mount the test equipment to conform to figure A.1 without mounting any test object. Since non-measurable draught effects in the test chamber could influence the flame, the possition of the fuel tray shall be adjusted to surround,as far as possible,the hose and one of its ends in the flame.
The hose end-connections to the test fixture(figure A.1) shall be made as specified in ISO 10088：1992, subclause 6.4.
A.4.2 Test
Fill the hose with fuel by opening the tank valve. Ensure that no air is left in the hose. Adjust the fuel level to 900 mm.
Pour 0,5 I of water and l I of heptane into the fuel tray and ignite the heptane. The fuel tray shall be placed so that two of the sides are parallel with the test object. Ensure that a stable flame is maintained and that the flame embraces the hose and one of its fittings for the duration of the test.
Allow the heptane to burn and record time to leakage.
The test is terminated when leakage occurs or when 2,5 min have elapsed.
If the flame is very unstable during the test and if it does not expose the test hose fully during at least 75% of the test duration, or if the time to leakage in any test deviates more than 30 s from the determined mean value, another two hose samples shall be tested.
After each test the fuel lines and fuel tray Shall be cooled to ambient temperature before a new test sample is mounted and water and fuel, respectively, are refilled.
WARNING−Large flames and burning waste fuel may occur at leakage： therefore the test shall be performed in a non-combustible environment and with personnel equipped with protective and fire-fighting equipment.
