heat gain from friction
heat gain from friction
(OP)
Hi, I have a random question. I have posted 2 post about pipe insulation and this question is related to those posts.
This concept might be something that I am totally pulling out of my butt but I would like to get some expert's input.
Let say i have 5" pipeline for oil transfer. Pump power to transport this oil over 50 km is about 1700 kw. Given 0.6 pump efficiency, I have about 1000 kw goes into pipe. Friction generates heat. 1 Btu/C = approx. 1 kw. With this given, based on 5" diameter pipe, i get about 0.33 BTU/hr-ft2-ft/ft of thermal conductivity. I am proposing to use polyurethane insulation which has K value of about 0.02. 0.33 vs 0.02? come one. This basically tells me it probablly doesn't even need insulation due to the heat generated by friction. I know it is not right since it looks like it is too good to be true. But I am trying to find out what I am missing here.
Thanks!!
This concept might be something that I am totally pulling out of my butt but I would like to get some expert's input.
Let say i have 5" pipeline for oil transfer. Pump power to transport this oil over 50 km is about 1700 kw. Given 0.6 pump efficiency, I have about 1000 kw goes into pipe. Friction generates heat. 1 Btu/C = approx. 1 kw. With this given, based on 5" diameter pipe, i get about 0.33 BTU/hr-ft2-ft/ft of thermal conductivity. I am proposing to use polyurethane insulation which has K value of about 0.02. 0.33 vs 0.02? come one. This basically tells me it probablly doesn't even need insulation due to the heat generated by friction. I know it is not right since it looks like it is too good to be true. But I am trying to find out what I am missing here.
Thanks!!





RE: heat gain from friction
RE: heat gain from friction
RE: heat gain from friction
pump discharge temperature,
pump discharge elevation,
pipeline outlet pressure,
pipeline outlet elevation,
ambient temperature,
and the cP, SG at both temperatures?
**********************
"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: heat gain from friction
Best regards
Morten