- #1
jamespb
- 2
- 0
I am trying to predict pressure drop in a pipeline with a range of different materials.
I have used a surface profilometer to measure the surface roughness of the different materials and I have values for various surface roughness variables - Ra Rz Rmax Rq Rm S Sm R3z Wt and a range of other variables.
The calculations I am using are based on using an "Absolute Roughness" (units mm) and the pipe diameter (units mm) to calculate a "Relative Roughness" and then from this calculate the Moody Friction Factor and head loss.
My issue is I have no idea which surface roughness value corresponds to the "Absolute Roughness" as used by the Moody Chart.
Thanks in advance for any assistance
I have used a surface profilometer to measure the surface roughness of the different materials and I have values for various surface roughness variables - Ra Rz Rmax Rq Rm S Sm R3z Wt and a range of other variables.
The calculations I am using are based on using an "Absolute Roughness" (units mm) and the pipe diameter (units mm) to calculate a "Relative Roughness" and then from this calculate the Moody Friction Factor and head loss.
My issue is I have no idea which surface roughness value corresponds to the "Absolute Roughness" as used by the Moody Chart.
Thanks in advance for any assistance