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?
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.