Pipeline Roughness
Pipeline Roughness
(OP)
Pipeline internal roughness has a large effect on the pressure drop for a gas pipeline, but the literature has wide variations. 0.020 mm (750 mil) appears to be a good design figure. What figures to others use?
Does regular pigging improve the roughness?
Does regular pigging improve the roughness?





RE: Pipeline Roughness
RE: Pipeline Roughness
The results of this test showed that the average roughness value for the sample was Ra = 4.4 micro m.
RE: Pipeline Roughness
The longer the pipe sets on the ROW then the higher the roughness. For example, roughness after atm exposure of 6 months is 1000-1250 microinches, for 12 months it is 1500 microinches and for 24 months it is 1750-2000. I am sure that salt air would accelerate the above corrosion rates.
As the Reynolds number increases then the pipe roughtness has a less and less impact on the friction factor.
RE: Pipeline Roughness
RE: Pipeline Roughness
The roughness for pipeline calculations cannot be measured, it is a theorectical roughness that is used in the flow calculations. My further research agrees with 1969grad (I also graduated in 1969) that 1000 microinches or 0.025mm is a good safe design number.