Orifice plate minimun lenght problems

[ale_001]

Hi friends,

I have in a project 2 orifice plate, each one after a pump. My problem is according to ISO 5167 part 2, in the installations parameters, its about minimun lenght for fitting upstream and downstream the orifice plate.

Data:

1.- orifice plate beta is: 0.41
2.- orifice plate beta is:0.71

accordin table 3 the pipping leght do not meet the distance, cause the first orifice plate the first fitting (tee) upstrean de primary element its at 30 in, and the seccond orifice plate its first pipping its a tee with a lenght of 4in.

What can you reccomend me, will i have problems in measurement, is there any way to avoid theorically the ISO 5167 in these paragraph.

[mobek]

did you think about using flow provers?