Design and calculation of hydrocracking flow control orifice plates
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Colleagues, in our facility we use a slurry bed hydrocracking process, and a pressure relief line is installed at the bottom of the slurry bed. When the interlock system is activated, this line is used to release the oil present in the slurry bed in order to control the temperature of the bed layer. However, our experiments have shown that significant vibration occurs in this line during oil release, which prevents it from functioning properly. According to the chemical industry standard HG20570.15, when the pressure difference across a liquid exceeds 2.5 MPa, it is necessary to use multiple orifice plates for pressure relief. I wonder if this is the reason why the design team did not choose to use multiple orifice plates.
There are standards for the use of orifice plates. Generally, the pressure at the rear section is no higher than 0.53 times the pressure at the front section. Of course, this is just an estimate; there are more precise methods for calculation. It also includes whether to use a single-hole or multi-hole plate.
What you mentioned applies to gases and vapors