What are the general pressure vessel parameters, sometimes design pressure, working pressure, the maximum allowable stress, etc., which is what meaning
1, work stress: under normal working condition, the container may achieve the highest pressure at the top. Is contained in the capacity of appellation of the maximum working pressure. 2, the maximum allowable working pressure: refers to the design temperature, top container allowed by the biggest table under pressure. The pressure is calculated according to the effective thickness of the vessel, and the minimum value. 3, nominal pressure, is a kind of pressure after standardized values, namely the numerous pressure numerical rank down to a certain number of series, the series of various pressure numerical value is called the nominal pressure. Nominal pressure to PN said. 4, design pressure: refers to the set of containers at the top of the highest pressure, its value is not lower than working pressure. Equipped with safety relief device of pressure vessel, the design pressure cannot under the relief valve opening pressure or blasting burst pressure. 5, calculate stress: refers to the corresponding design temperature, used to determine the thickness of the element of pressure, including static pressure liquid column. Description: working pressure is the basis of design pressure setting, design pressure is not container original work pressure. Working pressure is required by the process operating conditions, and the design pressure is together with the corresponding design temperature as a condition of the design of the container load.
Work pressure refers to the pressure of pressure vessel during normal operation; Design pressure is the pressure vessels according to its working pressure and determine, design parameters (calculate) pressure, it is higher than working pressure; Refers to the maximum allowable pressure operation allows the highest pressure, it does not allow more than design pressure and pressure relief valve set of takeoff. At the same time, and according to the regulation of test pressure, the average is 1.25 times of working pressure, and water as medium, air tightness test pressure, its use gas as medium, the pressure is equal to the pressure of work.
Above two has deviation! First of all, the friend, the first floor after the maximum allowable working pressure sometimes can be higher than the design pressure, the other is basically a correct answer. Friend, on the second floor of the maximum allowable working pressure has unified change to maximum allowable working pressure! Of article 4 of the "design pressure does not allow below the relief valve opening pressure". But when the maximum allowable working pressure vessel nameplate marked allows the relief valve opening pressure higher than the design pressure, higher than the maximum allowable working pressure are not allowed! That is good! Careful contrast should be able to find the right definition. Go!
