3 replies to this topic

[Noman97]

 

 Dear all,

I hope you all are doing well in your lives. I'm a junior process engineer and currently working on an assignment relevant to pump evaluation for a different service than initially purchased. One of the confusion I have come across during my calculations is regarding the pipe roughness of the pipe. Normally 0.0018" is considered for a new steel pipe but how to find out the impact of age on this figure theoretically?  Kindly share if there is any standard practice or your experience to address this query. 

 

Background 

1. Pipe material - CS
2. Time elapsed since in use - 15 to 20 years 
3. The pipeline is a piggable multi-product dispatch line (Gasoline, Kerosene and Diesel)
4. Line size and length - 6" & 650 m

@Art Montemayor @Bobby Strain @breizh @fallah @latexman

 

Thank you, looking forward to your kind responses.

  

 

[breizh]

Hi,

Consider this standard to support your work, related to condition (new or corroded).

Use your engineering judgment and or perform a sensitivity analysis on your system.

Good luck

Breizh 

Attached Files

•  p-001e5.pdf   92.33KB   15 downloads

[latexman]

I have no experience in this, but I was curious.  I Googled "can pipe roughness be determined during line pigging?" and the results looked encouraging to me.  You said the line was piggable.  If you are concerned, I suggest you look into it.  At least get a quote to add pipe roughness reporting next time the line is pigged, so one can decide to proceed with it or not.  Maybe someone else here has experience in this.

[fallah]

 

 Dear all,

I hope you all are doing well in your lives. I'm a junior process engineer and currently working on an assignment relevant to pump evaluation for a different service than initially purchased. One of the confusion I have come across during my calculations is regarding the pipe roughness of the pipe. Normally 0.0018" is considered for a new steel pipe but how to find out the impact of age on this figure theoretically?  Kindly share if there is any standard practice or your experience to address this query. 

 

Background 

1. Pipe material - CS
2. Time elapsed since in use - 15 to 20 years 
3. The pipeline is a piggable multi-product dispatch line (Gasoline, Kerosene and Diesel)
4. Line size and length - 6" & 650 m

@Art Montemayor @Bobby Strain @breizh @fallah @latexman

 

Thank you, looking forward to your kind responses.

  

 

Hi,

 

As the pipe ages, the absolute roughness increases almost linearly with time.

As a very rough estimation, the pipe roughness after any years of operation could be simply defined as half the average decrease in the effective internal pipe diameter, 0.5(D1-D2), where D1 is the pipe original internal diameter for new pipe and D2 is its internal diameter at the time of the aged condition.