There is a elbow and a control valve in front of the vortex flow meter; which one should be used to determine the straight pipe section?
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E+H has requirements for the upstream straight section of the vortex flow meter, as follows； Our layout is as follows; should we determine feasibility based on the distance to the elbow or the control valve? It’s strange if it’s based on elbows – it seems that having an additional elbow could actually reduce the length of the straight sections
The installation requirements for vortex flowmeters specify a certain length of straight pipe section to ensure stable fluid flow; typically, the starting point of this straight pipe section should be determined based on the nearest component that causes flow disturbances near the flowmeter. If both the control valve and the elbow are located before the flow meter, the control valve should generally be used as the starting point for calculating the length of the straight pipe section. This is because the flow disturbance caused by the control valve is greater than that of an elbow; calculating based on the elbow may not ensure sufficient fluid stability. Ensure that the length of the straight pipe section is determined in accordance with the requirements of the flow meter manufacturer. .
The straight pipe section does not include elbows; this is related to the flow pattern, as mentioned in GB2624
Hello, I’ve checked – this applies to differential pressure flowmeters; is it also suitable for vortex flowmeters? Another question: do you mean that the total length of the straight section after the control valve, excluding elbows, should be considered to determine whether the 50D requirement is met?
GB2624 explains why it is necessary to specify the length of straight pipe sections, as fittings such as elbows can affect the flow pattern. GB50093 6.5.3~6.5.11 specifies the required straight pipe section lengths for various flowmeters. When actually conducting model reviews, it is still necessary to follow the straight pipe section length required by the instrument manufacturer.
Bent pipes don’t count; if you use bent pipes, it’s clear that they require higher standards regarding the straight pipe ends compared to other situations
Bent pipes don’t count; if you use bent pipes, it’s clear that they require higher standards regarding the straight pipe ends compared to other situations
The straight pipe section in front of the elbow can be counted, right?
I consulted the manufacturer, and personally I think it’s sufficient to consider only the straight section of pipe behind the elbow
Follow the specifications, and also refer to the manufacturer’s standards! The real impact isn’t that great after all!