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This safety alert addresses the hidden dangers associated with screwed piping connections, particularly the risk of crevice corrosion on threads. Such corrosion can compromise the strength and integrity of fittings, potentially leading to catastrophic failures. Operators and maintenance crews must be aware of these risks, especially in pressurized systems transferring corrosive gases. If a leakage is detected, the system should be shut down and depressurized before any inspection or re-tightening. Proper awareness and protocol can prevent dangerous incidents.
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Safety Alert 04/95 Committed to Safety Screwed Fittings Background Screwed piping connections can have unseen dangers due to the risk of crevice corrosion of the threads. Crevice corrosion of piping threads can result in a loss of strength and integrity along the threads. Leaking fittings should not be tightened under pressure as the connection may fail completely. It is important that all production operators, maintenance crews and their supervisors are aware of the dangers of screwed piping fittings. Pressurised systems transferring corrosive gases are particularly dangerous. Recommendations Equipment with a leaking screwed fitting should be shut-down and depressurised. The fitting should be removed and inspected. Re-tightening under pressure could be dangerous as the condition of the fitting is unknown. Learning Points There are a number of screwed piping connections in PDO in many locations. It is important to inform personnel of the hazards and to alert them of the dangers of tightening screwed fittings that are pressurised. For more information on this topic, please contact AOS/4 at 67-7867.
