Division of explosion-proof zones in heat transfer oil furnaces

1 First, the pressure level of the old heat transfer oil furnace. The steel plate cracked because the operating pressure of the boiler exceeded the maximum allowable working pressure. Due to a faulty safety valve, pressure is not automatically released to the specified level ； Or the pressure gauge malfunctions and fails to indicate the operating pressure accurately ； Such catastrophic accidents occur due to reasons such as a failed alarm system, which prevents operators from taking preventive measures in a timely manner. Therefore, the staff must regularly check the pressure gauge of the heat transfer oil furnace, and take measures in advance if the pressure becomes too high. 2. The temperature of the heat transfer oil furnace is too high, exceeding its limits: the furnace tubes crack due to overheating, often as a result of severe water shortage or direct flame contact with the tubes, excessive scale buildup, or the presence of oils in the furnace water. 3 Another point is the regular maintenance of heat transfer oil furnaces: the inner and outer surfaces of the furnace tubes thin out due to corrosion, and they may crack when their strength becomes insufficient. Improper operation during operation caused the boiler to experience sudden temperature changes, leading to crack formation in the steel at areas under high stress due to fatigue. 4 Combustible gases ； Failure to perform a pre-purge before starting the boiler, or using an insufficiently long purge time, or failing to carry out a post-purge after frequent startups, results in combustible gases (natural gas) remaining in the furnace, which can cause the boiler to explode when ignition occurs. 5 The final point is the design and structure of the heat transfer oil furnace itself; due to its inherent defects and the failure to detect these issues in a timely manner, problems can arise during use. Therefore, it should be classified as an explosion-hazardous area.

Your fuel pipelines may leak, so they should be classified as Zone 1 for explosion protection, and explosion-proof electrical equipment must be used~

Can an explosion occur if the operating temperature of the heat transfer oil exceeds its flash point and a leak takes place? Is this a possible scenario?