Calculation of working discharge of breathing valve

Work discharge is a loss due to man-made loading and unloading.As a result of loading, when the pressure in the tank exceeds the release pressure, the vapor is pressed out of the tank.The discharging loss occurs when the liquid level is discharged and the air is pumped into the tank, expanding as the air becomes saturated with organic vapor, thus exceeding the capacity of the vapor space to accommodate it. The operating discharge of fixed-top tanks can be estimated from the following equation: LW=4.188×10^-7×M×P×KN×KC Formula: LW - loss of operation of fixed roof tank (input of Kg/m3);KN-turnover factor (dimensionless) is determined by the number of turns per year (K).Turnover times = annual input / tank capacity;K<=36, KN=1;36220, KN=0.26

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What is the common fault of pneumatic film regulating valve?

Leakage is the easiest failure of regulating valve during operation. Some leak at the welding place, and some leak at the sealing place of the stuffing. When leakage occurs at the welding site, repair welding can be done during overhaul; when leakage occurs at the sealing site of the stuffing, new stuffing can be replaced. Sometimes the film of the film actuator is damaged, and the valve stem can't act normally with the air pressure signal, so it needs to be replaced with a new film. In order to avoid the deformation of the valve stem affecting the regulating function, it is better to stand on the pipeline when installing the regulating valve. It is not suitable to install the low-temperature film regulating valve horizontally, and it should form an angle above 150 with the level so that the sealing place of the stuffing is not affected by the liquid. The slanting valve must be lifted. When operating, always pay attention to whether the regulating valve gets stuck. The sealing fille...

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Why the low temperature valve is easy to get stuck and cannot pull. How to solve it?

The low temperature valve is installed at normal temperature and works at low temperature, with a wide range of temperature variation. If the design and installation are not appropriate, it is easy to generate thermal stress or deformation. Meanwhile, the operation part of the valve is at normal temperature, and the circulation part is at low temperature. In order to reduce the cold loss, the stem is often made very long, which is easy to produce deformation and get stuck. Low temperature valve often rotates flexibly at normal temperature, but it is tight at low temperature, even can't be opened. The main reasons why the valve gets stuck at low temperature are: 1) during installation, prestress is generated due to unreasonable configuration of the valve and the pipeline; or the cold compensation ability of the pipeline is poor, and the valve position changes at low temperature; or the valve lacks support, and deformation is generated at low temperature; or the valve is not fixed pro...

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