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The SPA method depends on the short pathlength of tritium-released beta particles. For instance, the decay of a Tritium atom releases a beta particle, which is well-suited to SPA due to a very short (1.5 μm) path length through water. So, when the β-particle is within 1.5 μm of the scintillant bead, there is sufficient energy to stimulate ...
They have large surface areas enabling them to operate for long periods. Cartridge filter systems also permit better water flow that other filter alternatives [clarification needed] –thus placing less strain on filter pumps. These types of filters are also easiest to clean, e.g., using the flow of high-pressure water from a hose.
First, a static pressure gauge is attached to the test hydrant and the static water pressure is measured at the test hydrant. Second, the flow hydrant opened to allow water to flow in a fully open condition. Simultaneously the pitot tube pressure is recorded from the flow hydrant while the residual pressure is measured from the test hydrant.
The test involves filling the vessel or pipe system with a liquid, usually water, which may be dyed to aid in visual leak detection, and pressurization of the vessel to the specified test pressure. Pressure tightness can be tested by shutting off the supply valve and observing whether there is a pressure loss.
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This means that a much shorter column is needed compared to water. [2] For instance, the pressure represented by a column of 100 mm of water is just under 7.4 mm of mercury . [3] The pressure is determined by measuring the difference in height between the reference column and the column connected to the item under test.