BS EN 4649:2009 pdf free download – Aerospace series Handheld fire extinguishers with synthesis gases, for aircraft use – Technical specification and qualification conditions.
7.13 Fire extinguisher tightness
Leakage shall be limited to:
1 cc of gas per day and per kilogram of extinguisher charge or 1 cc of gas per day and per litre of extinguisher charge;
— loss of charge mass not exceeding 5 % per year.
7.14 Visual access
When the fire extinguisher is installed on its bracket, the following points shall be visible:
— code symbols of fire classes;
— pressure indicating device;
— controlling-device locking system has not been unlocked.
8 Qualification tests
8.1 General test conditions and definition
8.1.1 Application of qualification
The qualification procedure requires:
— transmission of the qualification application to the competent authorities in accordance with applicable regulations;
— the technical documentation defining the equipment, including justification of the pressure strength through the calculation note or experimental design method;
— the technical user’s guide;
— the technical data sheet in accordance with the specimen in Annex C.
8.1.2 Equipment for qualification
A minimum of 21 fire extinguishers with brackets to be qualified shall be submitted in operating condition.
See Annex D.
If not already qualified in accordance with this standard, the following components shall be submitted for
qualification purpose:
— vessel: 5 units for each test. See 8.3.
pressure indicating device: 5 units. See 8.4.3.
— pressure-relief safety device: 10 units where applicable. See 8.4.2.
— discharge hose: 5 units where applicable. See 8.4.6.
8.1.3 General test conditions
Unless otherwise specified, the tests shall be performed in the following ambient conditions:
— temperature: between 15 °C and 25 °C;
— atmospheric pressure: between 86 kPa and 106 kPa;
— relative humidity: less than 85 %.
The equipment shall be in a stabilized condition before beginning of each test.
8.1.4 Test chronology
The summary table of extinguisher’s qualification tests is given in Annex D.
All the fire extinguishers that have undergone qualification shall not be used after qualification.
8.1.5 General check
Each test shall be preceded and followed by a visual inspection and a check of the mass of the fire extinguisher.
8.2 Weighing
The following masses shall be mentioned in the technical data sheet, see Annex C:
— empty fire extinguisher;
— full fire extinguisher in operating condition;
— bracket.
NOTE For weighing, the empty or full fire extinguisher is considered without the bracket and without protection elements used for transport and storage.
8.3 Tests on the vessel
8.3.1 Pressure test
An internal pressure will be applied to the vessel.
All the orifices shall be blanked using appropriate plugs. The pressure rise shall be slow and gradual, with a maximum average gradient of 2 bars per second.
A stabilized internal pressure shall be applied for 30 s minimum, equal to the test pressure defined in 7.2.3.
The assembly shall remain tight and shall show no defect.
After releasing the pressure and stabilization of 30 s minimum, check that the volume has not increased by more than 1 % over the initial volume and that there is no damage to the material such as fractures or cracks.