Can anyone provide a reference for design factors/allowances used for the increased roughness factor of a pipe for the design life of the system when calculating the pressure drop?
Are there any rules of thumb?
I have heard of using 5 times or 10 times roughness factor for aging of pipe but have not seen any reference material regarding this. Is this common practice and is this good practice?
I have some concerns with this as depending on the process and pipe materials, there will be different corrosion rates.
Say I am designing a process water pipeline to a plant with a 25 year design life. I have already calculated pressure drops based on clean piping. Do you recalculate at a greater roughness (of 5times clean pipe roughness)?
Same question but for hydrocarbon?
Are there any rules of thumb?
I have heard of using 5 times or 10 times roughness factor for aging of pipe but have not seen any reference material regarding this. Is this common practice and is this good practice?
I have some concerns with this as depending on the process and pipe materials, there will be different corrosion rates.
Say I am designing a process water pipeline to a plant with a 25 year design life. I have already calculated pressure drops based on clean piping. Do you recalculate at a greater roughness (of 5times clean pipe roughness)?
Same question but for hydrocarbon?
