Case 2: in a coastal refinery, the desalted water pipe is made of 304stainless steel, the wall thickness is 4.5mm, the medium temperature is 70 ℃ and the pressure is 0.39MPa. Magnesium aluminum silicate is used as insulation layer. Four years later, the leakage of the pipe was found, and the crack was visible to the naked eye when the insulation layer was removed. Through the observation of the macro and micro characteristics of the crack, it can be seen that the crack originates from the outer surface, propagates in a dendritic shape, and the crack is transgranular, which is a typical austenitic stainless steel stress corrosion cracking, and the main corrosive factor is the chloride ion on the surface of the pipe. The reason is that the coastal ambient air contains salt and high humidity, while the magnesium aluminum silicate fiber blanket has a porous structure and strong adsorption capacity. Under long-term working conditions, chloride ions in thermal insulation materials and environment are adsorbed and deposited on the outer surface of stainless steel pipes, resulting in stress corrosion cracking.
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Jintan Company has thoroughly implemented the requirements of the notice on doing a good job in cold and frost prevention, made plans for anti-freezing accidents, carried out emergency drills, formulated “special technical measures”, and stored cold-proof materials such as insulated cotton, thermal quilt, electric blanket, etc., check the implementation of cold-proof and anti-freezing measures on the meter daily, and check the weak links such as water pipes, valves, electric heating and heat preservation at measuring points in the factory area. Strengthen the regular flushing and switching frequency of chemical water system and lubricating oil system, focus on the thermal control instrument pipeline, drainage pipeline and pressure gauge plate type thermal insulation measures, and increase the temperature measuring points in each thermal insulation cabinet, which can be transmitted to the DCS system in real time, which is convenient for operators to monitor the temperature in the cabinet, find it and solve it as soon as possible.
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