A piping fitting failed, resulting in the release of approximately 5 pounds of ammonia (NH3) in the machinery room. The nipple (fitting) between the oil separator and its relief valve cracked and failed to hold ammonia in the piping, resulting in the activation of the exhaust ventilation system. Fittings made of certain materials are incompatible with ammonia and degrade quickly in its presence. For example, Copper and its alloys. The presence of vibration in the system further increases the chances of initiation and quick progression of any crack-type discontinuity, leading to the failure of the fitting.
Root Cause(s):