BS EN 3-8-2006 pdf download.Portable fire extinguishers Part 8: Additional requirements to EN 3-7 for the construction, resistance to pressure and mechanical tests for extinguishers with a maximum allowable pressure equal to or lower than 30 bar.
6.3.4.3 Requirements — Fittings
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 fittings shall remain tight and show no dangerous defect.
6.3.4.4 Requirements — Assembly
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 assembly shall remain tight and show no dangerous defect.
6.3.5 Pressure test — Pressure gauges and pressure Indicators
6.3.5.1 Test conditions
Five samples 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 until 2.5 times P (T) is reached. Maintain this pressure for 30s.
6.3.5.2 Requirements
When tested at a temperature of (20 ± 5) °C, the sample shall not leak at a pressure less than 2,5 times P (Tmax).
Failure shall occur at a pressure greater than 2.5 times P (Tmax) and when the gauge fails there shall be no ejection of any components.
NOTE This test should be considered to be a destructive Lest.
6.3.6 Macroscopic examination of the body
On five bodies each weld subject to pressure shall be examined, the macroscopic examination of a transverse section of the weld, in accordance with EN 1320. shall show complete fusion over the area treated with a preparation acid and any defects shall be revealed.
If there is any doubt, a microscopic examination of the suspect area shall be carried out.
6.3.7 Plastics components
6.4 Overfill pressure test (for water based media cartridge operated extinguishers only)
To make sure the extinguishers will remain safe even in case of overfilling, the extinguishers shall be tested in accordance with Annex G and shall not eject any components in a dangerous manner. This test shall be performed on two samples.
6.5 Resistance to Impact
6.5.1 Test conditions
TS and TSmin claimed by the manufacturer shall be used for the tests in 6.5.2 and Annex C.
6.5.2 Requirements
When tested in accordance with Annex C, extinguishers shall not show evidence of bursting, breakage or ejection of components. Non-dangerous leaks are acceptable.
7 Manufacturing
7.1 General requirements
The manufacturer shall ensure that he has available the manufacturing means and processes suitable for fabricating the bodies in accordance with this European Standard.
The manufacturer shall ensure that the materials and components used in the fabrication of the body are free from any defect likely to impair the safe use of the extinguisher.
7.2 Welded and brazed parts
7.2.1 General
Pressure bearing welds shall be formed using an automatic welding procedure.
Welds and brazed joints shall be free from defects which may impair the safe use of the body.
7.2.2 WeldIng procedures
The welding procedures shall be based on a welding procedure specification in accordance with EN ISO 15614-1 or EN ISO 15614-12 and shall be qualified in accordance with EN ISO 15614-1 or EN ISO 15614-12 or EN ISO 15614-2.
7.3 Traceability
7.3.1 Pressure retaining parts
The identification and the control of the materials for all pressure retaining parts shall be such as to ensure that the materials used in manufacture meets the specification of the design.
This is realised by application of adequate procedures internal to the manufacturer such as batch controL
7.3.2 Operating devices, filling caps and hose assemblies
The operating devices, filling caps and hose assemblies which are or may be subjected to pressure during normal
use shall be indelibly marked to permit subsequent identification and traceability.
8 Inspection and testing during production
8.1 Final examination
8.1.1 Final examination personnel
The examination personnel shall be competent to carry out the processes involved.
8.1.2 Proof testing
8.1.2.1 General
All extinguisher bodies shall be tested for resistance to test pressure and shall meet the requirements of 8.1.2.2.
Fittings shall be tested for resistance to test pressure and shall meet the requirements of 8.1.2.3.
All fittings in Category II or higher of the New Approach Directive 97/23/EC Pressure Equipment, shall be subjected
to a pressure test, other fittings shall be pressure tested using an adequate sampling plan.
8.1.2.2 Requirements for bodies
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 arid the body shall not leak. After the test, the body shall not show any visible signs of permanent deformation.BS EN 3-8-2006 pdf download.