VIGNETTE 7.5Injury while working on equipment under pressure

A laboratory person connected a fresh helium cylinder to a gas manifold. When the cylinder valve was opened to pressurize the system, a slight hissing sound was heard from a fitting that connected a flexible metal hose to the manifold pressure regulator. An attempt was made to repair the leak while the system was still pressurized. On applying a wrench to the fitting, the flexible hose disconnected completely and whipped off the regulator, striking the individual on the head, cheek, and abdomen, causing bruises and lacerations.

This incident highlights the importance of deenergizing systems and processes prior to disassembly or maintenance.

From: 7, Working with Laboratory Equipment

Cover of Prudent Practices in the Laboratory
Prudent Practices in the Laboratory: Handling and Management of Chemical Hazards: Updated Version.
National Research Council (US) Committee on Prudent Practices in the Laboratory.
Washington (DC): National Academies Press (US); 2011.
Copyright © 2011, National Academy of Sciences.

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