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.
6.3.4.2 Requirements — Bodies
The test pressure IT shall not be less than 143 times the maximum allowable pressure PS with a mmrium of 20 bar.
The test pressure shall be maintained for a minimum 0130 S and the body shall remain tight.
After the test, the volume of the body shall not increase by more than 1 %.
6.3.4.3 RequIrements — Fittings
The test pressure PT shall not be less than I 43 times the maximum allowable pressure PS with a n,wwnum of 20 bar.
The test pressure shall be maintained for a minimum of 30s and the fittings shall remain tight and show no dangerous defect.
6.3.4.4 Requirements — Assembly
The lest pressure PT shall not be less than 143 times the maximum allowable pressure PS with a minimum of 20 bar.
The lest 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 (Tmax) is reached. Maintain this pressure for 305.
6.3.5.2 Requirements
When tested at a temperature ci (20 ± 5) ‘C, the sample shall not leak at a pressure less than 2,5 times P (T).
Failure shall occur at a pressure greater than 2.5 times P (Tm) and when the gauge fails there shall be no etection of any components.
NOTE This lest should be consn1eed to be a destructive test
6.3.6 Macroscopic examination of the body
On five bodies each weld subject to pressure shall be examined, the macroscopec 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.
The test pressure IT shall not be less than 143 times the maximum allowable pressure PS with a mmrium of 20 bar.
The test pressure shall be maintained for a minimum 0130 S and the body shall remain tight.
After the test, the volume of the body shall not increase by more than 1 %.
6.3.4.3 RequIrements — Fittings
The test pressure PT shall not be less than I 43 times the maximum allowable pressure PS with a n,wwnum of 20 bar.
The test pressure shall be maintained for a minimum of 30s and the fittings shall remain tight and show no dangerous defect.
6.3.4.4 Requirements — Assembly
The lest pressure PT shall not be less than 143 times the maximum allowable pressure PS with a minimum of 20 bar.
The lest 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 (Tmax) is reached. Maintain this pressure for 305.
6.3.5.2 Requirements
When tested at a temperature ci (20 ± 5) ‘C, the sample shall not leak at a pressure less than 2,5 times P (T).
Failure shall occur at a pressure greater than 2.5 times P (Tm) and when the gauge fails there shall be no etection of any components.
NOTE This lest should be consn1eed to be a destructive test
6.3.6 Macroscopic examination of the body
On five bodies each weld subject to pressure shall be examined, the macroscopec 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.
