Flow orifice plate – help with flow calculation
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This post was last edited by tree135 on 2018-1-10 at 19:26. Dear experts: I have a question. Given the calculation sheet for the orifice plate, the differential pressure transmitter on site is set to transmit the differential pressure signal to the DCS, and the medium being measured is condensate. My questions are: 1. Since the medium is condensate, is it necessary to perform temperature and pressure compensation? 2. The differential pressure needs to be squared before the flow rate can be calculated; how can the flow rate in T/h be determined from the differential pressure?
The calculation sheet will provide the formulas; there are many of them on forums, which can be searched for. Generally, Q = k * sqrt(deltaP),
1. The density of the condensate liquid is already known, so no temperature and pressure compensation is required. 2. What are the upper limits for differential pressure and flow rate? ?
Aren’t the corresponding values for differential pressure and flow rate in the table?
The upper limit for differential pressure is 25,000 Pa, and the upper limit for flow rate is 149,899.9 kg/h. For example, if the actual differential pressure is 20,000 Pa, then the calculated flow rate will be: F (in kg/h) = ﹝20,000 ÷ 25,000﹞ * 149,899.9 kg/h
Let’s take an example: lol For instance, if the differential pressure at the site is 20,000 Pa, what is the corresponding flow rate in t/h?
At 25 kPa, the flow rate is 150 t; the calculated coefficient is 30 (150/sqrt(25)). sqrt(20 kPa) multiplied by 30 gives the flow rate at 20 kPa.