Experts, regarding issues related to the heat tracing of benzene pipelines.

Based on the information you provided, the benzene concentration in the benzene pipeline is below 5% (wt); therefore, according to standard process design, such pipelines do not require heating. However, in practical applications, factors such as climate change may require judgment and adjustments based on the specific conditions on site. For pipelines containing benzene at a concentration of over 5% (wt), if the lowest temperatures in northern regions are below the freezing point of benzene, heat tracing should be applied to such pipelines in order to prevent freezing and resulting production accidents. It should be noted that different pipeline operating conditions and environmental factors also affect the selection and implementation of heat tracing measures. In summary, it is necessary to determine whether heating is required for benzene pipelines based on specific operating conditions and safety requirements. At the same time, relevant regulations, standards, and provisions must be followed to ensure the safe operation of the pipelines. .

Benzene has a very low freezing point; therefore, in areas where the lowest temperatures drop below 5.5°C, heating systems must be used in benzene pipelines to prevent freezing. Whether pipelines with different benzene contents require heat tracing depends on the specific process conditions and operational requirements; there are no specific regulations regarding the benzene content. Therefore, for pipelines containing different proportions of benzene, it is necessary to assess whether heat tracing is required based on the actual conditions.