(3) The calculated hole diameter of RO should be rounded to the conservative size for easy manufacturing.
#FLOW CALCULATION SOFTWARE ORIFICE PLATE THICKNESS ISO#
The geometry and dimensions should be as per ISO 5167 standards for the equation to be applicable. However, for the erosional services such as slurry or flush services, countermeasures for erosion shall be considered. Further the pipe surface should be smooth. Therefore, it should not be necessary to take a straight run of piping both upstream and downstream of RO to keep performance. (2) The necessity of minimum straight run length-īasically, the objective of RO is rough control of flow rate and should not be used for strict control of flow rate. When the diameter smaller than the above values is required, the strainer or filter to remove debris should be provided upstream of RO. To prevent the plugging problem with RO caused by debris, the hole diameter should be greater than the following values: Special Consideration of RO Design: (1) The minimum hole diameter of RO. Assumptions include saturated gas and CH4+CO2 add to 100. ⑪ Repeat the steps from ③ to ⑧, until the cavitation index is equivalent to the minimum allowable value. QED orifice flow calculation tool uses AGA and ASME orifice flow calculation methods to provide an estimate of gas flows given a limited set of input data (gas temperature, CH4/CO2 ratio, applied vacuum, QED orifice size, pipe size and resulting delta-Pressure across the orifice). ⑩ Assume the upstream pressure of n-th stage orifice. ⑨ Set the upstream pressure of (n-1)-th stage orifice for the downstream pressure of n-th stage orifice. If the cavitation index equals to or slightly bigger than 0.37 (or 0.93), the design of the first stage RO is completed and go to step ⑨. If cavitation index < 0.37 (or 0.93), decrease the upstream pressure and repeat the steps from ③ to ⑧.
If the cavitation index 0.37 (or 0.93), increase the upstream pressure and repeat the steps from ③ to ⑧. If cavitation index ≥ 0.37 (or 0.93), then the orifice diameter is acceptable.
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