BS 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

BS 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 The test pressure PT’ shall not be less than 1,43 times the maximum allowable pressure Ps with a minimum of20 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 1 %. 6.3.4.3Requirements – Fittings The test pressure PT shall not be less than 1,43 times the maximum allowable pressure Ps with a minimum of20 bar. The test pressure shall be maintained for a minimum of 30 s and the fittings shall remain tight and show nodangerous defect. 6.3.4.4Requirements – Assembly The test pressure PT shall not be less than 1,43 times the maximum allowable pressure PS with a minimum of20 bar. The test pressure shall be maintained for a minimum of 30 s and the assembly shall remain tight and show nodangerous 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 aregular increase of pressure at a maximum of 2 barls until 2,5 times P(Tmax) is reached. Maintain this pressure for30 s. 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 ejectionof any components. NOTE This test should be considered to be a destructive test. 6.3.6Macroscopic examination of the body On five bodies each weld subject to pressure shall be examined, the macroscopic examination of a transversesection of the weld,in accordance with EN 1320，shall show complete fusion over the area treated with apreparation acid and any defects shall be revealed. lf there is any doubt, a microscopic examination of the suspect area shall be carried out. 6.3.7 Plastics components Plastics components shall comply with the requirements of Annex D. 6.4Overfill 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 inaccordance with Annex G...