pipeline anode temp
pipeline anode temp
(OP)
how can i calculate the temperature at the external surface of a coated pipeline on the seabed? pretty dure i'm missing something basic here, i've calculated the ohtc but unsure of next step.
its for a CP design, i usually just assume the temp of inner product of the pipeline, however this is to high for the anodes we are using and i need to prove the temp will be within limits.
its for a CP design, i usually just assume the temp of inner product of the pipeline, however this is to high for the anodes we are using and i need to prove the temp will be within limits.





RE: pipeline anode temp
Develop a composite U value for the pipe wall, the anti-corrosion coating, and the anode material using a delta T between the product in the pipeline and the seawater temperature (I think!)
Alternatively, just wrap an insulating sheath under the bracelet anodes to prevent excessive conduction.
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdoweb/
RE: pipeline anode temp
The alternative proposed above using a insulation sheath is also possible but there again you will have to perform qualification testing to ensure that the sheath used does not degrade with aging unless supplier can propose you a convenient material for the design life.
To calculate a quick composite U assume a additional virtual coating layer using soil thermal properties but there again the calculation may not tell you much as soil properties may be difficult to get and will be variable.
Investigate in all 3 directions.
RE: pipeline anode temp
i have calculated an ohtc for the pipe wall and the coatings however i didnt think the anode should be included as i want to find the temperature at the outer surface of the coating to know what the anode is exposed to.
RE: pipeline anode temp
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdoweb/
RE: pipeline anode temp
RE: pipeline anode temp
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdoweb/
RE: pipeline anode temp
See attached spreadsheet typically used for calculating the anode temperature. This process actually helps in reducing the anode quantity for long pipelines.
In some of my projects I have actually used a layer of neoprene sheet below the anode to reduce the temperature.
Rgds Naren
Narendranath R
Pipeline engineering is made easy with state of the art computer software, visit www.narendranath.itgo.com.
RE: pipeline anode temp