Process Engineering Division – Instrumentation and Automation Section – Daily Topics – Topic No. 2021-01-27
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Process Engineering Division – Instrumentation and Automation Section – Daily Topics – Topic No. 2021-01-27: Discussion question: 370. Under normal circumstances, orifice flowmeters are not recommended for measuring steam flow. What is the reason for this?
Large errors occur when measuring low flow rates in steam warhead-type average velocity tubes, as the steam pipe is inserted at a 45° angle from below the tube, resulting in unequal levels of condensate water at the positive and negative ends, which prevents accurate measurement. In this way, the general modification method adjusts the insertion orientation to achieve a relatively equal height.
Bar-type flow meters are based on continuous flow, and they measure the flow rate by detecting the pressure difference across the throttling element. If steam is measured using a flow meter, phase change may occur during throttling, resulting in inaccurate flow measurement.
Large errors occur when measuring low flow rates in steam warhead-type average velocity tubes, as the steam pipe is inserted at a 45° angle from below the tube, resulting in unequal levels of condensate water at the positive and negative ends, which prevents accurate measurement. In this way, the general modification method adjusts the insertion orientation to achieve a relatively equal height
A factory uses delta bar for measuring the steam flow rate in its boilers……
Large errors occur when measuring low flow rates in steam warhead-type average velocity tubes, as the steam pipe is inserted at a 45° angle from below the tube, resulting in unequal levels of condensate water at the positive and negative ends, which prevents accurate measurement. In this way, the general modification method adjusts the insertion orientation to achieve a relatively equal height
It is likely still because the uniform-speed orifice generates condensate water, causing a change in differential pressure and resulting in low measurement accuracy. We have completely replaced all our previous DeltaBar flowmeters for measuring steam with orifice plates.
Large errors occur when measuring low flow rates in steam warhead-type average velocity tubes, as the steam pipe is inserted at a 45° angle from below the tube, resulting in unequal levels of condensate water at the positive and negative ends, which prevents accurate measurement. In this way, the general modification method adjusts the insertion orientation to achieve a relatively equal height
The differential pressure is too low; it is not suitable for using an isolation tank
Large errors occur when measuring low flow rates in steam warhead-type average velocity tubes, as the steam pipe is inserted at a 45° angle from below the tube, resulting in unequal levels of condensate water at the positive and negative ends, which prevents accurate measurement. With this common modification method, the insertion orientation is adjusted to achieve a relatively equal height; the pressure difference is too small, making it unsuitable to use an isolation tank
Large errors occur when measuring low flow rates in steam warhead-type average velocity tubes, as the steam pipe is inserted at a 45° angle from below the tube, resulting in unequal levels of condensate water at the positive and negative ends, which prevents accurate measurement. In this way, the general modification method adjusts the insertion orientation to achieve a relatively equal height.