Acceptable error margin in DP flow meters

I have been waodering is there any international standard or best pratice that specify the limit for the acceptable error margin which can be resulted in DP flow measurment. I have gone through some of them, however I didnt find a firm statement that specify an exact number or percentage of the acceptable error in the readings. Did anyone came across an international document that provide such information?

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My experience is it is site specific and varies. Unless you are talking custody then you would like use some form of calculated flow or flow computer.

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