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Pipe on pipe heat transfere


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I have worked with piping and heat tracing for 40+ years. I suspect you are asking the wrong question. The piping comes first. You size the pipe (and material) based on the flow requirements and properties of the fluid (Is it simply water? Is it oil? Is it chemically aggressive?) You size the heat tracing afterward, enough to cover the pipe and supply adequate heating (kW) to maintain the required temperature inside the pipe, given the expected outside temperature. You will need more heat tracing in Siberia than Minnesota. It is often necessary to cycle heat tracing on and off when it is cold, but not the coldest time of the year. The heat input (kW/m) is selected to match Q=UA(Tpipe-Tair) Tair and Tpipe are site-specific. Typical values of U can be found in the literature.

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Actually we planned to implement electric heat tracing for bitumen handling pipe system. But our management proposed Pipe on pipe heat tracing system. So now problem  is to  finding 200 mtr long 12" carbon steel pipe carrying Bitumen product at 130 deg C. here we providing mineral wool insulation 50 mm.so we want to maintain these tempearture at the end of line. Min ambient temperature considered at site 0 deg C. To compensate the heat loss of pipe we are going to use pipe on pipe heat tracing method(Thermic fluid at 250 deg C). LIKE Above the mother pipe, one small pipe. Now problem how to find required tracing pipe size and number of line.

Qmax_steam_tracing.jpeg

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Heat trace tape is usually wound along a pipe in helical pattern like a spring, distributing heat over the surface. While it's not uniform coverage, it's usually enough to somewhat evenly heat. A single source of heat along one side as pictured may be problematic.

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Yeah, Great idea, but here we are goindg to use 3 to 6 number of straight  line over the mother pipe. so we can avoid that issue. Here i want to what size to be lay over the mother pipe and how many straight line pipe?

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  • 5 months later...

I am confuse with your method in carbon steel pipe for transfer bitumen. The correlation of your purposed to install single tube and heat loss around mother pipe. What if I suggested to you used an infra red measuring instrument or using thermocouple sensor. So you can modelled for heat loss and easy to installed than using tube. (SFMBE)

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