Surface Quality
For a fire water gun with good surface quality, its castings should be free of scars, cracks, and holes. You can take a small knife and gently scrape the surface of the aluminum part of the gun. The reason for this is to see if it has undergone anodization. Anodization is a process where an oxide film forms on the aluminum product (acting as the anode) because of the current under specific electrolyte and process conditions for aluminum and its alloys. This process helps overcome the drawbacks of aluminum alloy’s surface hardness and wear resistance, broadening its application range and extending its service life.
Anti-drop Performance
Regarding anti-drop capabilities, first, set the water gun (with the rotary switch in the off position) in three positions: nozzle vertically upward, nozzle vertically downward, and the water gun’s axis horizontal (if there’s a switch, make sure it’s below the water gun’s axis and in the off position). Then, from a height of (2.0 ± 0.02) m above the ground (measured from the water gun’s lowest point), let it fall freely onto the concrete floor. The water gun should drop twice at each position. After that, recheck the water gun. If the fire interface is broken or it can’t function normally after the fall, the product will be considered unqualified.
Pressure Test
Start by sealing the water outlet end of the water gun. Next, connect the water inlet end of the water gun to a manual pressure test pump or an electric pressure test pump device through the interface. After that, get rid of the air inside the gun body. Then, slowly increase the pressure to 1.5 times the maximum working pressure and maintain it for 2 minutes. At this point, the water gun should not have any cracks, fractures, or residual deformation that could affect its normal use.
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