I'm looking to understand some more about the failure of a Scotch boiler.
The basic question is: what could have caused a large amount of water to flood into the stokehold of a 1920s steam coaster as part of the failure of the ship’s Scotch boiler?
Contributions from members of this forum have been very helpful in exploring the problems that the engineers and firemen would have had during the last difficult hours of SS Camlough's unfortunate last trip. The ship was running at a slow speed, attempting to make it back to her home port of Belfast with a partly-repaired engine. It might have achieved the journey, if not for the additional misfortune that an exceptional wind storm (described as 'a hurricane') developed a few hours after they were committed to their route.
From contemporary accounts (especially one which extensively quotes the Camlough’s chief engineer) members of this forum have explained the likelihood that the ship’s engine had suffered a failure of one cylinder, and that temporary repairs had left the engine running slowly on two cylinders. This could have affected the running of the boiler.
• Because it was reported that they had to stop the ship’s engine in order to pump more water to the boiler, it’s likely that inefficient and slow hand-pumping was taking place (possibly because the main boiler feed pumps would have been run from engine cylinder which had failed and was disabled).
• It also seems likely that the water level in the boiler may possibly have dropped to an unsafe low level at one or more times, either because steam in the engine room prevented an accurate reading of the gauges or because of one incident when it was critical to keep the engine running in order to avoid being driven on rocks by the storm. Immediately after this incident (in other words as soon as it was safe to do so) they stopped the engine for a half hour ‘because it was necessary to get water to the boiler‘ after which time the engine was re-started and the ship continued at the same slow speed (4 knots).
The ultimate failure of the boiler with its crowns falling points to there having been serious damage to the boiler, possibly taking place over a period of time before the catastrophic ending.
There are different types of contemporary newspaper accounts of Camlough’s loss of power.
Scottish newspapers had interviewed the exhausted and relieved crew of the ship at Portpatrick, immediately after their rescue from their life-threatening drama. There are few direct quotes – but phrases used by the reporters convey some of the most dramatic and worrying incidents that crew members had experienced as the boiler was failing.
Both Scottish newspapers mention the Camlough's two boiler crowns falling.
1) One of the Scottish accounts says 'The engine room was full of steam and the engineers were unable to see the amount of water in the boilers. The engines were stopped. The stokehold became full of water and the firemen, standing knee-deep in water, were unable to get the engine going.' It's implied that all this was going on some time before the crowns fell in the boiler (the reporter’s wording suggesting that the firemen were responsible for the getting the engine going is one reason I suspect that the reporters had interviewed a fireman).
2) The second Scottish account says, 'The engine gave out, the stokehold was soon flooded, and coals were being washed out of the bunkers.' In this account the next thing mentioned is the crowns of the furnace falling 'rendering the ship useless and the crew helpless.'
By comparison, there is the account of the chief engineer, Harry Thompson, who was interviewed for a Belfast newspaper a few days later. This article is helpfully detailed about other aspects of that difficult and dangerous journey, but it is surprisingly vague about exactly what was going on at the time when the engines finally came to a standstill. Thompson is quoted as saying:
3) [After travelling at a steady slow speed for 11 hours overnight in a raging storm, with the repaired engine operating at reduced efficiency] ‘...about 7 a.m. on Wednesday ... I noticed that the engines were losing their efficiency. Very soon afterwards they came completely to a standstill, and although we did our utmost to get the trouble right, we found it was impossible.’
There is nothing in the chief engineer’s account about the boiler crowns falling or water flooding the stokehold. The only water below decks that Thompson mentioned (earlier in the article) was the amount of steam that was remaining in the engine room after the partial repair to the engine had been completed, ‘The engine room was still full of steam, and we were not able to see, but luckily no water was getting into the vessel.’
So what could have caused so much water to flood the stokehold at this dramatic moment in Camlough’s last hours?
From my limited reading about Scotch boilers, I wonder whether they would have been fitted with a fusible plug. As a safety device, this could have melted due to insufficient water in the boiler (or possibly also due to damage having been started by running the engine with the water level too low as they struggled to keep the ship from being on the rocks, leading to more gradual boiler failure). If so, would this have created a flood like this?
How dangerous would this situation have been for the firemen?
Any help in understanding how that quantity of water could have ended up in Camlough’s stokehold will be greatly appreciated.
The basic question is: what could have caused a large amount of water to flood into the stokehold of a 1920s steam coaster as part of the failure of the ship’s Scotch boiler?
Contributions from members of this forum have been very helpful in exploring the problems that the engineers and firemen would have had during the last difficult hours of SS Camlough's unfortunate last trip. The ship was running at a slow speed, attempting to make it back to her home port of Belfast with a partly-repaired engine. It might have achieved the journey, if not for the additional misfortune that an exceptional wind storm (described as 'a hurricane') developed a few hours after they were committed to their route.
From contemporary accounts (especially one which extensively quotes the Camlough’s chief engineer) members of this forum have explained the likelihood that the ship’s engine had suffered a failure of one cylinder, and that temporary repairs had left the engine running slowly on two cylinders. This could have affected the running of the boiler.
• Because it was reported that they had to stop the ship’s engine in order to pump more water to the boiler, it’s likely that inefficient and slow hand-pumping was taking place (possibly because the main boiler feed pumps would have been run from engine cylinder which had failed and was disabled).
• It also seems likely that the water level in the boiler may possibly have dropped to an unsafe low level at one or more times, either because steam in the engine room prevented an accurate reading of the gauges or because of one incident when it was critical to keep the engine running in order to avoid being driven on rocks by the storm. Immediately after this incident (in other words as soon as it was safe to do so) they stopped the engine for a half hour ‘because it was necessary to get water to the boiler‘ after which time the engine was re-started and the ship continued at the same slow speed (4 knots).
The ultimate failure of the boiler with its crowns falling points to there having been serious damage to the boiler, possibly taking place over a period of time before the catastrophic ending.
There are different types of contemporary newspaper accounts of Camlough’s loss of power.
Scottish newspapers had interviewed the exhausted and relieved crew of the ship at Portpatrick, immediately after their rescue from their life-threatening drama. There are few direct quotes – but phrases used by the reporters convey some of the most dramatic and worrying incidents that crew members had experienced as the boiler was failing.
Both Scottish newspapers mention the Camlough's two boiler crowns falling.
1) One of the Scottish accounts says 'The engine room was full of steam and the engineers were unable to see the amount of water in the boilers. The engines were stopped. The stokehold became full of water and the firemen, standing knee-deep in water, were unable to get the engine going.' It's implied that all this was going on some time before the crowns fell in the boiler (the reporter’s wording suggesting that the firemen were responsible for the getting the engine going is one reason I suspect that the reporters had interviewed a fireman).
2) The second Scottish account says, 'The engine gave out, the stokehold was soon flooded, and coals were being washed out of the bunkers.' In this account the next thing mentioned is the crowns of the furnace falling 'rendering the ship useless and the crew helpless.'
By comparison, there is the account of the chief engineer, Harry Thompson, who was interviewed for a Belfast newspaper a few days later. This article is helpfully detailed about other aspects of that difficult and dangerous journey, but it is surprisingly vague about exactly what was going on at the time when the engines finally came to a standstill. Thompson is quoted as saying:
3) [After travelling at a steady slow speed for 11 hours overnight in a raging storm, with the repaired engine operating at reduced efficiency] ‘...about 7 a.m. on Wednesday ... I noticed that the engines were losing their efficiency. Very soon afterwards they came completely to a standstill, and although we did our utmost to get the trouble right, we found it was impossible.’
There is nothing in the chief engineer’s account about the boiler crowns falling or water flooding the stokehold. The only water below decks that Thompson mentioned (earlier in the article) was the amount of steam that was remaining in the engine room after the partial repair to the engine had been completed, ‘The engine room was still full of steam, and we were not able to see, but luckily no water was getting into the vessel.’
So what could have caused so much water to flood the stokehold at this dramatic moment in Camlough’s last hours?
From my limited reading about Scotch boilers, I wonder whether they would have been fitted with a fusible plug. As a safety device, this could have melted due to insufficient water in the boiler (or possibly also due to damage having been started by running the engine with the water level too low as they struggled to keep the ship from being on the rocks, leading to more gradual boiler failure). If so, would this have created a flood like this?
How dangerous would this situation have been for the firemen?
Any help in understanding how that quantity of water could have ended up in Camlough’s stokehold will be greatly appreciated.