The impact of installing a flow orifice plate in the reverse direction on flow measurement
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At the site, it was observed that the oxygen gauge at the inlet end was 16% lower than that at the outlet end; it is suspected that the standard orifice plate was installed in the wrong direction. I was wondering if anyone has encountered a similar situation? What is the impact of installing it in reverse on flow measurement, and is it linear? I once read that the impact of installing a DN200 natural gas orifice plate in the reverse direction is 17%.
It’s impossible to determine the extent of the impact; what is certain is that the display is on the low side....
There must be an impact, but it’s not as significant as you say
Installed backwards, too low. It’s difficult to quantify.
If it’s installed in the wrong direction, the value will definitely be lower; it’s hard to say exactly by how much, but at least a 10% decrease is likely. It’s not possible to calculate an exact figure, so the only option is to use the correct installation method and compare the flow rates before and after
It’s installed backwards; the pressure drop is reduced, and the flow rate is low! It is necessary to roughly determine this error value through calculations; it is recommended to use simulation software to see the results!
It’s definitely on the low side; as for exactly how much lower, there hasn’t been any research on that yet
This post was last edited by FightingNow on 2016-3-6 21:07. I don’t know how to determine whether this orifice plate is installed backwards by judging the degree of influence! But when a orifice plate is installed, there are usually direction indicators on the part that is exposed, so give it a look. For example, throttle elements usually come with a handle, and that handle will have information regarding the material used; the side with the inscription is likely to indicate the positive flow direction. . I’m just talking about what I’ve seen... it may not apply to your factory!
The poster should compare: Are the operating pressures listed in the calculation sheets for the two orifice plates close (identical) to the actual operating values at present?
. . . I recommend checking out the set of questions for instrument technicians