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Steam Header Silencer Failure

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Steam system in Utility Plant produces Super High Pressure (SHP), High Pressure (HP), Medium Pressure (MP), and Low Pressure (LP) steam. The header of every steam type has a control valve and a silencer downstream to open in case of high pressure. The MP steam header suddenly spiked up following a malfunction of the high range letdown valve from the HP header to the MP header. The MP header vent control valve opened up to control the header pressure. However, the opening of the vent valve led to severe damage to the internals of the silencer. Fortunately, there was no personnel injury or environmental impact, only equipment damage. The direct and root cause of the failure was identified after silencer was offered for internal inspection. Gross corrosion of silencer internals, and silencer design were the direct root causes of this failure. However, an effective mitigation and resolution was implemented by preventing condensate accumulation and providing a way to clean drain lines and prevent pluggage.

Product Number: MPWT19-14241
Author: Hassan Ali Al-Hammad,
Publication Date: 2019
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