Issues regarding the insulation of the gas-phase pipes in distillation towers

The vapor extraction pipe at the top of the tower generally does not require insulation; as for the reflux tank, insulation is only necessary if there is a need to protect it from heat, otherwise it is also not required.

If it is double-effect distillation, heat insulation needs to be considered.

What is the significance of double-effect distillation? Thank you.

Our return pipes are insulated; the exact reason is unknown, but I think it’s to prevent burns.

If you want to cool down in the first place, why try to keep warm? Areas where heat is retained may be those that operators could accidentally touch, so some heat protection measures are needed.

1. For safety, to prevent people from getting burned. 2. Reduce fluctuations caused by changes in ambient temperature by using a cooler for artificial control, thereby avoiding frequent adjustments.

If the material may crystallize in winter and cause pipeline blockages, not only insulation is required, but also heat tracing is necessary. Additionally, insulation for high-temperature pipelines is very important for heat prevention. I think that in the heat of summer, no operator would want to get close to such pipes to work on them, as it poses safety risks ； Also, if (outdoor pipes) are exposed to rain or snow, think about what will happen to the pipes?

Insulation is necessary for two reasons: 1. to prevent burns, 2. Preventing low-boiling-point impurities from condensing is important as it affects the purity of the product!

It is heat-resistant; no insulation is needed, unless there is a liquid bag.

Selection of insulation types 2.0.1 Scope of application Equipment, pipes, fittings, valves, etc. (hereinafter collectively referred to as pipes) that meet one of the following conditions must be equipped with insulation measures. 2.0.1.1 Equipment and pipelines with a surface temperature greater than 50°C, and those for which the external surface temperature must be less than or equal to 50°C according to the production process requirements (except for equipment and pipelines for which insulation is not required or not feasible from a process perspective). 2.0.1.2 Equipment and pipelines whose medium freezing point is higher than the ambient temperature. 2.0.1.3 For equipment and pipelines whose surface temperature exceeds 60°C and that do not require insulation, as well as those areas that require frequent maintenance and for which no other measures can be used to prevent burns, heat-insulating layers to prevent burns should be installed within the following ranges: (1) At a height of less than 2.1m above the ground or work platform ； (2) Distance from the operation platform is less than 0.75 m ； 2.0.1.4 It is necessary to prevent or reduce cold losses of the cold medium and the coolant during production and transportation. 2.0.1.5 It is necessary to prevent or reduce the temperature rise of the cold medium and the coolant during production and transportation. 2.0.1.6 It is necessary to prevent dew formation on the outer surfaces of low-temperature equipment and pipelines. 2.0.1.7 Condensation formed due to external temperature effects corrodes the equipment pipelines. 2.0.1.8 When the noise generated by equipment and pipelines exceeds the allowable noise level specified in the project requirements, sound-insulating materials (usually thermal insulation materials) must be used to cover these equipment and pipelines in order to reduce the noise level. 2.0.2 Selection of insulation layer thickness: The thickness of the insulation layer for equipment and pipelines is determined based on the insulation requirements for such equipment as well as characteristics such as medium temperature, as specified in the process data sheets issued by the chemical engineering and process systems fields. These specifications are taken into account together with the \"Insulation Design Regulations\" provided by the pipeline materials field. Except for processes with special insulation requirements. Excerpted from (Selection of Insulation and Heat Retention Types HG/T 20570.11—95)