subsea pipe in pipe insulation
subsea pipe in pipe insulation
(OP)
Hi, I am to design pipe in pipe for transporting crude oil and I am confused to what equations & theories to use. The main criteria is to find the insulation that would bring the product to the destination at the temperature of 90F and above (starting 250F) over 55km.
Any help would be appreciated.
Any help would be appreciated.





RE: subsea pipe in pipe insulation
Best regards
Morten
RE: subsea pipe in pipe insulation
You may also need to define multiple pump head capacities you will need as temperature changes occur over start-up shut-downs and restarts after 1 day, 3 days, 1 week etc. shut-downs and/or if sea temperatures change during seasons.
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"Pumping systems account for nearly 20% of the world's energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: subsea pipe in pipe insulation
**********************
"Pumping systems account for nearly 20% of the world's energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: subsea pipe in pipe insulation
I dont think temp changes during shut down will matter much - but you have a point about the cooled oil in the line could have different properties. Apart from this i have heard that non-newtonian flow is cooon for curdes?
Anyway his question was for steady state arrival temperature - and here i think was answer was fair! Theres no way you can specify insulation for an idefinate shut down - it will cool sooner or later!
Best regards
Morten
RE: subsea pipe in pipe insulation
Depending on the diameter and insulation start-up times to reach various flowrates after cooling to various lower temperatures over certain periods of time can be quite different. In may cases on land pipelines, full temperature stability is never actually reached due to seasonal temperature variations as well.
**********************
"Pumping systems account for nearly 20% of the world's energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: subsea pipe in pipe insulation
Best regards
Morten
RE: subsea pipe in pipe insulation
If you "heard" it on the internet, it's guilty until proven innocent. - DCS
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RE: subsea pipe in pipe insulation
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"Pumping accounts for 20% of the world's energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: subsea pipe in pipe insulation
Narendranath R
Pipeline engineering is made easy with state of the art computer software, visit www.narendranath.itgo.com.