Calculation of pipe insulation material thickness. . How to select the protective layer material?
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Is rock wool still the main insulation material used for pipes these days? How to calculate the thickness of pipeline insulation material. . ? Is it necessary to calculate D1ln(D1/D0) and then look up the value in a table? To what extent should the calculated value be rounded? For example, if the calculated thickness of the insulation layer is 51, to what value should it be rounded? How to select the protective layer material?
During design, it is generally selected based on experience from the \"Insulation Thickness Table\" in Volume 2 of the Pipeline Manual, and it is roughly similar to the calculated value. If you do the rounding, I personally think it should be rounded up ； If it’s only for heat protection, it should be positioned lower. The protective layer is usually aluminum sheet; tinplate is also used in some cases, but it is prone to corrosion when used outdoors. Rock wool provides good insulation
First, calculate the total heat transfer coefficient from the pipeline surface to the surrounding air； The surface temperature of the insulation layer for heat retention is set at 60 degrees, while the dew point of the fluid used for heat insulation is 1–2 degrees higher ； Determining the thickness of a single-layer insulation from the surface temperature of the insulation layer ； Select from table ；
For calculations, refer to Part 3 in the \"Chemical Process Design Manual\"
The insulation material for pipes should be selected based on the temperature of the medium inside the pipe; it is not fixed. The thickness of the pipeline insulation layer is calculated based on the economic thickness in accordance with the \"Technical Specifications for Insulation of Petrochemical Equipment and Pipelines\" SH3010-2000.