CASE STUDY: Interference Figure 2 - Piston with Manufacturers Product Code Figure 1 - Data from 6320/PA showing head knocking Summary A hydrogen compressor at a refi nery began producing a knocking sound after an overhaul and the T ech Services group at Windrock was asked to provide analysis of the data collected by the customer. Our T ech Services team confi rmed the knocking was caused by a piston striking a cylinder. The OEM was responsible for repairing the piston and Windrock was able to save the customer thousands of dollars and avoid a major catastrophe. Background Machine operators with a large refi nery began hearing a loud knocking sound from a compressor during the warm-up period after an overhaul. Once warmed up, the knocking sound disappeared. During the next s

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