In a recent incident under investigation, a preliminary inquiry has been conducted under the Boiler Explosions Acts, shedding light on an explosion originating from the main boiler of the Nephrite (s). The Nephrite, a screw steamer with a 673 gross tonnage and 90 nominal horse-power, constructed in 1896, primarily plies its trade along the coast. The vessel loaded with coal departed from Workington on December 1 and set sail for Limerick. However, a potentially catastrophic situation unfolded during the voyage.
Around 10 p.m. on December 2, the fireman on watch reported a leak in the front end plate of the boiler to the first engineer, who was also on duty. Subsequent examination revealed a fracture in the end plate between the starboard and center furnaces, directing hot water across the mouth of the starboard furnace. Despite the compromised condition, the engineer believed it feasible to maintain boiler operation until reaching the destination in Limerick. Unfortunately, the severity of the leak escalated, and by 9 a.m. on December 3, due to challenges in sustaining water levels and managing the fire in the starboard furnace, the master, following consultation with the engineer, made the decision to divert the vessel to Passage West, Queenstown.
The vessel successfully reached its interim destination, and a patch, covering the crack, was promptly riveted on the water side of the plate. Subsequently, the Nephrite continued its voyage to Limerick without further incident. Examination of the boiler revealed indications of grooving around the flanged portions of the end plate at the furnace mouths, though the plate remained practically at its original thickness.
According to the observations of the Engineer Surveyor-in-Chief, Mr Peter Samson, the root cause of the incident appears to be the furnace front plate of the boiler being subjected to racking stresses. These stresses resulted from the uneven expansion of the furnaces, inducing grooving at the flanged portions where the plate is attached to the furnaces. This ultimately led to the sudden development of a crack in the localized stress area. Fortunately, the vessel managed to reach a position of safety before more serious consequences could unfold.
The incident highlights the critical role played by timely decision-making in averting potential disasters at sea. The collabourative efforts of the master and engineer in diverting the Nephrite to Passage West showcased effective risk management, ensuring the safety of the vessel and its crew. The connection to Limerick, a vital port in the region, adds significance to this maritime incident, emphasizing the importance of rigorous maintenance and adherence to safety protocols in seafaring activities.
Lloyd’s List – Wednesday 01 May 1907
