Reasons for cracks in heat exchangers

2009-02-19View Original

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One of our company’s vertically installed U-tube methanol vaporization superheaters has the following specifications: Shell side: P=0.6 MPa, t=170 (inlet)/280 (exit), DN=400; Mediums: methanol and water; Shell material: 0Cr18Ni10Ti, 6 mm thick. Information on the tube side is not available. After 6 years of use, 8 cracks were found within a 1-meter range above the liquid level in the shell side. After replacing the shell, cracks reappeared in the same areas after 2 months. What could be the cause of this? This device is used for hydrogen production through methanol cracking; we have used many of them in the past and there have been no problems.

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Reasons for cracks in heat exchangers

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