Some knowledge about gas extinguishing system

As for the gas extinguishing system, after the pipe of the pneumatic drive device is installed, the pressure tightness test should be carried out. This is an essential part of the gas extinguishing system. During the test, the pressure increases gradually and slowly. When the pressure rises to 50% of the test pressure, if no anomaly or leakage is found, the pressure will continue to rise step by step at 10% of the test pressure. At the same time, the steady pressure of each stage is 3 min, until the test pressure value. You should maintain the pressure and check all parts of the pipe. If no deformation, no leakage, it is qualified.
When it comes to the fire extinguishing agent conveying pipe, when using thread connection, the pipe should be cut mechanically. At the same time, we should ensure that the thread is not missing, broken and other phenomena and the sealing material of the thread connection is evenly attached to the threaded part of the pipe. When tightening the thread, do not squeeze the packing into the pipe. The root of the thread after installation should be 2 to 3 exposed threads. After the connection, clean up the outside of the joint and do anti-corrosion treatment. When a flange connection is used, the liner shall not protrude into the pipe, the outer edge of which should be close to the bolt, and the double cushion or partial cushion shall not be placed. The bolt, diameter, and length of the connecting flange shall conform to the standard. After tightening, the length of the protruding nut shall not be greater than 1-2 of the diameter of the screw and shall not be less than 2 exposed threads. Welding connection should not be used for a seamless steel pipe which has been treated with anti-corrosion treatment. When a flange welding connection is needed for individual connection parts such as the selection valve, the anticorrosion coating damaged by welding should be treated with secondary anticorrosion treatment. The pipe passes through the wall and casing should be installed on the floor. The nominal diameter is at least 2 grades larger than the nominal diameter of the pipeline. The casing length through the wall should be equal to the wall thickness, and the casing length through the floor should be 50 mm higher than that of the floor. The gap between pipe and casing is filled with a fire-proof sealing material.
For every gas extinguishing system, the installation of prefabricated fire extinguishing systems should be taken into serious consideration. The installation of prefabricated fire extinguishing systems such as hot aerosol fire extinguishing devices and their controllers, the installation position of acousto-optic alarms should meet the design requirements, and be fixed and reliable. The surrounding space environment of the prefabricated fire extinguishing system should meet the design requirements. As for the control assembly, for manual operation at the protective area, the automatic switch should be installed at the entrance of the protective area where it is easy to operate, and the installation height is 1.5 m from the ground. Start manually, stop button installed in the entrance of the protective area and easy to operate, the installation height is 1.5 m from the ground. The installation of acousto-optic alarm device in the protective area shall meet the design requirements and shall be firmly installed and not tilted.