Do heat transfer oil pipes belong to pressure pipelines? What is the pipeline level?

It is a GC2 pressure pipeline; the typical inspection rate is 15%

The design conditions are unclear, so it is impossible to determine

GC2 category, flaw detection 15~20%

I cannot provide a direct answer to your question; only relevant information is offered for reference. In fact, there are two types of heat transfer oil systems, classified by their operating mode or pressure: 1) liquid-phase normal-pressure heat exchange, meaning that the heat transfer oil operates below its boiling point. The pressure acting on the pipeline is the sum of the static pressure provided by the sump (for example, 10 meters corresponds to nearly 1 kilogram) and the pressure generated by the pump. 2) Heat exchange under pressure in the gas phase, that is, the heat transfer oil operates above its boiling point. When analyzing the pressure exerted on the pipeline, it is also necessary to consider the vapor pressure of the heat transfer oil. What exactly the pipeline level should be is likely governed by relevant **standards**. Looking forward to the answer as well.

According to the pressure pipeline regulations, it can be classified as GC2 category

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According to the pressure pipeline regulations, it should be GC2 class

Without design specifications, how can one determine whether it belongs to a pressure pipeline? Once it is determined to be a pressure pipeline, how can one determine its classification level, so as to decide on the inspection requirements such as flaw detection? The guys upstairs just said GC2 – can you provide the relevant standards?

Since the conditions are unclear, it is difficult to determine whether it is a pressure pipeline. However, according to common reasoning, when the operating temperature of heat transfer oil exceeds its flash point, it is considered a pressure pipeline.