What do dynamic back pressure and static back pressure of a breather valve refer to respectively? What is it made of?

Is the dynamic back pressure the same as the exhaust back pressure? Is the static back pressure the same as the additional back pressure? So for a breather valve, are there two separate sets of static and dynamic back pressures corresponding to it?

Dynamic backpressure refers to the pressure generated by the valve during fluid flow, while static backpressure refers to the pressure in the system when the valve is closed. The factors that contribute to backpressure include pipeline resistance, the density and viscosity of the fluid, flow velocity, and the layout of the system. In the situation you described, the minimum operating pressure setting being lower than the design pressure means that the relief valve will open at a low pressure difference, thereby protecting the tank from damage caused by overpressure. The specific value of back pressure needs to be determined based on the actual pipeline design and operating conditions. .

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It’s too vague and meaningless; what exactly does exhaust backpressure refer to? Are they the straight pipes and local resistances generated by fluid flow during the discharge process? What needs to be considered in composition? Sharing some experience values is of no use to beginners

So should the set pressure be determined by taking the total backpressure into account? If the discharge point is located far away, wouldn’t the dynamic backpressure be very high? Moreover, if the terminal cannot be equipped with a fan (to send exhaust gases to the water scrubber tower), the total back pressure will already be several kilograms. With such a high back pressure, won’t the set pressure also need to be increased? Then the design pressure of the tank also has to be increased, which raises the overall cost? Also, how does this safety valve achieve overpressure relief? It opens at the set pressure to allow for discharge. The overpressure is intended to lift the valve seat fully so as to ensure the necessary amount of discharge for achieving the desired effect. My understanding is that the container won’t experience excessive pressure, thus meeting the requirement to overcome backpressure; in that case, won’t the exhaust gases fail to reach the water scrubber?

To calculate the discharge backpressure, first the pipeline must be installed; the length of the pipeline, its diameter, and the fittings must all be determined. For pipes that have not been installed, once installation is complete, it is necessary to recalculate based on the pipe layout. Considering different discharge flows, the resistance is calculated based on the material properties. It’s all in Chapter 1 of Principles of Chemical Engineering.

Thank you for sharing:victory: