Which pipes should be considered for insulation or cooling?

1. Pipelines for oils with relatively high viscosity； 2. Fluids with a high freezing point.

There are two reasons: 1. When exposed to cold, the flow velocity of the fluid decreases, which increases the need to maintain heat or keep it cold in order to supply sufficient energy for fluid transport； 2. For the pipes used for heat (cold) recovery, insulation is required to maintain heat (cold) until it has been recovered.

In my personal analysis or understanding: 1. Generally, media that undergoes condensation due to changes in temperature need to be insulated. 2. Media that, if left exposed outside, could pose a risk to human safety also require insulation. 3. To ensure that the media remains in a liquid state due to pressure considerations in pipes or equipment, cooling is necessary, as in the case of nitrogen tanks (referring to high-pressure nitrogen). 4. Depending on the properties of the medium being transported, changes in its physical state may occur under cold or hot conditions, leading to solidification or reduced fluidity

Insulation is required for heavy oil, the heating furnace combustion system, PSA feed, and the reactor

We’re in the north; people are probably worried that the pipelines might freeze and crack

It mainly depends on the temperature of the medium in the pipeline; for example, steam pipelines need to be insulated； The liquid nitrogen and liquid oxygen pipelines in air separation, as well as other pipes carrying cryogenic media, must be insulated!

Fluids with a high freezing point and pipelines that are sensitive to heat loss should be insulated; high-temperature pipelines should also be insulated to prevent injury, and pipelines designed for heat recovery need to be insulated as well.

1. When the temperature of the medium is higher than that of the surrounding environment, heat is lost; this heat can be recovered, and heat loss is not desired； 2. The medium temperature is high, making it easy to get scalded by the heat ； 3. The medium requires low temperatures; it heats up when exposed to the external environment, so cooling is necessary ； 4. Media with a relatively high freezing point ； 5. Anti-freezing wires for winter in the north.

1. Insulation should be used when the temperature of the medium is above 60°C to prevent burns. 2. Insulation is necessary for pipes at heights of less than two meters that are exposed to high temperatures. 3. Insulation should be applied to pipes that are within 0.7 meters of a platform

Insulation is required when the pipeline temperature is below 50°C. For media that require low temperatures and may experience temperature increases due to the external environment, cooling measures are necessary

Answer: (1) Equipment and pipelines with one of the following conditions shall be insulated； l) Equipment and pipelines with an external surface temperature greater than 50°C, and those with an external surface temperature of 50°C or less but for which insulation is required due to process needs. For example, liquefied hydrocarbon pipelines at the pump inlet that are often exposed to sunlight: the distillation column top product lines (pipelines from the column to the condenser), the column top reflux pipelines, and the fuel gas pipelines after liquid separation should all be insulated ； 2) Equipment and pipelines whose medium freezing point or ice point is higher than the ambient temperature (referring to the annual average temperature). For example, crude oil with a freezing point of around 30°C, in equipment and pipelines located in areas where the average annual temperature is below 30°C ； In cold or extremely cold regions, although the freezing point of the medium is not high, equipment and pipes containing water within that medium – such as water pipes that do not flow frequently in cold areas – may be affected. (2) Equipment and pipelines with any of the following conditions must be insulated: l) It is necessary to reduce the temperature rise or vaporization of the cooling medium during production or transportation (including freezing due to sudden pressure reduction causing vaporization) ； 2) It is necessary to reduce the heat loss of the cold medium during production or transportation, or to specify an allowable level of heat loss ； 3) It is necessary to prevent dew formation on the outer surfaces of equipment or pipelines at ambient temperature.

The pipes of such devices need to be insulated or cooled, which indicates that strict temperature controls are required; the allowable range of temperature fluctuations is small. Therefore, pipes that are subject to high or low temperatures should be insulated or cooled. Of course, insulation and cooling are also necessary due to environmental factors. For example, in enterprises located in the north where temperatures are low in winter, some pipes may experience intermittent flow and thus risk freezing. As for cooling, it applies to those devices that require cooling – in summer, circulating water is not sufficient, so chilled water must be used to prevent an increase in temperature during transportation; hence the need for cooling

1. Pipelines for oils with relatively high viscosity； 2. Fluids with a high freezing point. 3. Higher temperatures can easily cause burns to the operators