BS/EN 1866-2-2014 pdf download.Mobile fire extinguishers Part 2: Requirements for the construction, pressure resistance and mechanical tests for extinguishers, with a maximum allowable pressure equal to or lower than 30 bar, which comply with the requirements of EN 1866- 1.
The materials used for pressure bearing parts shall be defined in a detailed specification which forms an
integrated part of the design.
This specification shall contain at least detailed descriptions of:
— all raw materials used, including the normal production tolerances;
— the processes used, the process parameters and the normal admissible process tolerances;
— the relevant required material properties after processing.
The materials used for non-pressure bearing parts and accessories of extinguishers shall be compatible with the materials used for the pressure bearing parts.
Plastic components shall fulfil the clauses of Annex B except hoses, pistols and nozzles.
For the materials used in the type testing and type approval, inspection documents in accordance with Annex G shall be provided.
All materials used in the extinguisher assembly shall be compatible with all other components including extinguishing media. Particular attention shall be given to incompatibilities that may result in galvanic corrosion and stress corrosion.
6 Design and prototype testing
6.1 Calculation design method
EN 13445-3:2009, Clause 7 contains recognized calculation methods, If a body of a mobile fire extinguisher Is designed in accordance with these recognized calculation methods no burst pressure test is required.
If these recognized calculation methods are used for the design of the body, all relevant aspects from EN 13445 parts ito 5 shall be observed.
6.2 ExperImental design method
The experimental design method may be used for bodies with a volume up to 200 I.
If a body of a mobile fire extinguisher is designed with an experimental design method, a burst test of the body is required.
The wall thickness of the body shall not be less than the wall thickness given by the formula below.
6.3 Prototype testing
6.3.1 Pressure test
6.3.1.1 Test conditions
Two bodies including accessories shall be submitted to the hydrostatic pressure test which shall be carried out using apparatus that permits a regular increase of pressure at a maximum of 2 bar/s up to the moment the test pressure PT is reached.
6.3.1.2 Requirements
The test pressure PT shall not be less than 1,43 times the maximum allowable pressure PS, with a minimum of 20 bar.
The test pressure shall be maintained for a minimum of 30 s and the body shall remain tight.
After the test, the volume of the body shall not increase by more than I %.
6.3.2 Burst test
6.3.2.1 Test conditions
lithe body is not designed in accordance with EN 13445 parts 1 to 5, one sample shall be subjected to a burst test.
The burst test under hydraulic pressure shall be carried out using an installation wtiich permits a regular increase of pressure at not more than 2 bar/s until the body bursts and also permits the variation of pressure to be recorded as a function of time.
6.3.2.2 Requirements – Bodies
The burst pressure I’, shall not be less than 2,7 times the maximum pressure PS.
The burst test shall not cause the body to fragment.
The main break shall show no signs of brittleness, for example the edges of the break shall not be radial, but shall be inclined relative to a diametrical plane and shall have a reduction in area over their entire thickness.
The break shall not show any obvious defects in the material.
The break shall not originate in the body marking or weld.
6.4 Macroscopic examination
On two bodies each weld subject to pressure shall be examined; the macroscopic examination of a transverse section of the weld, in accordance with EN ISO 9017, shall show complete fusion over the area with preparation acid and any defects shall be revealed.
If there is any doubt, a microscopic examinat,on of the suspect area shall be carried out.
6.5 Attached parts
Attached parts shall be made so not to cause any dangerous stresses or any specific corrosion flsks.
6.6 Overfill pressure test
This test is required for water based extinguishing media cartridge operated extinguishers only.
One extinguisher shall be tested In accordance with Annex D. During this test, no components shall be ejected.
6.7 Requirements for components subject to pressure
6.7.1 Test conditions
Two samples of each type of component subject to internal pressure shall be submitted to the pressure test which shall be carried out using apparatus that permits a regular increase of pressure at a maximum of 2 bar/s up to the moment the test pressure PT is reached.
6.7.2 Requirements
The test pressure PT shall not be less than 1,43 times the maximum allowable pressure PS, with a minimum of 20 bar.
The test pressure shall be maintained for a minimum of 30 s and the components shall remain leaktight and show now defects such as cracks, splits or ejection of parts.
6.8 Hose assembly and attached components
6,8.1 Requirements
The hose assembly and attached components shall function throughout the operating temperature range, and coupling systems shall be designed and fitted in such a way that they cannot damage the hose.BS/EN 1866-2-2014 pdf download.