![]() The coal available in Australia had a lower calorific value than Welsh steam coal. Īn unusual feature of Aberdeen's boilers were the adjustable length of the grate. : 106–111 : 89 : 124 Triple expansion steam engines would continue to power major vessels throughout the world for the next seventy years. This left no significant routes in which sail clearly outcompeted steam. This level of efficiency meant that steamships could now operate as the primary method of maritime transport in the vast majority of commercial situations. These figures in trials were comfortably achieved on her maiden voyage. In service, this translated into less than 40 tons of coal a day when travelling at 13 knots (24 km/h 15 mph). This was a reduction in fuel consumption of about 60%, compared to a typical steamer built ten years earlier. Aberdeen was a marked success, achieving in trials, at 1,800 indicated horsepower, a fuel consumption of 1.28 pounds (0.58 kg) of coal per indicated horsepower – which was felt to be the equivalent of 1.5–1.6 pounds (0.68–0.73 kg) of Welsh steam coal in sea service. These boilers had patent corrugated furnaces that overcame the competing problems of heat transfer and sufficient strength to deal with the boiler pressure. : 106–111Īberdeen was fitted with two double ended Scotch type steel boilers, running at 125 pounds per square inch (860 kPa). 150 pounds per square inch (1,000 kPa) had been the planned boiler pressure, but the replacement boilers that had to be fitted could only achieve 90 pounds per square inch (620 kPa). Propontis had boiler problems from the outset. Triple expansion engines required much higher boiler pressures than was readily available from the contemporary technology. The senior partner at Napier's was Alexander Carnegie Kirk, a talented engineer who had experimentally fitted the world's first "triple expansion" compound steam engine to the SS Propontis in 1874. She was constructed at Govan in the shipyard of Robert Napier and Sons on Clydeside, Scotland. She served as a Turkish troopship in World War I until a British submarine sank her in 1915.Īberdeen was designed as the first steamship in the fleet of the Aberdeen Line, intended for high speed service between the United Kingdom and Australia and the Far East. ![]() The fuel economy achieved meant that steam could now outcompete sail on all major commercial routes.Īberdeen was sold in 1906 to the Ottoman government. The triple expansion engine then became the standard type of steam engine to be installed in seagoing vessels. She was the first ship to be successfully powered by a triple expansion steam engine. She was designed for service from London to Australia. SS Aberdeen was a British cargo liner launched in 1882. Edwards was one of many Coast Guard ships used to service those aids to navigation.Triple expansion steam engine, single screwġ2 first class passengers and (outward voyage only) 450 third class passengers Because Canada has the longest coastline in the world and depends on maritime trade for its prosperity, the government has to maintain a large network of aids to navigation to ensure safe transit of ships in and out of Canadian harbours. Edwards and its engine to good use as a lighthouse and buoy tender. Though never used in war, the Canadian government put the C.P. Edwards was intended as a military supply ship for service in the South China Sea during the Second World War. This 15-ton steam engine powered the CCGS C.P. Edwards was one of the last generation of ships to use the triple-expansion steam engine. From then until after the Second World War, shipbuilders used these engines to propel many of their larger vessels. In 1881, Scottish marine engineers installed the first triple-expansion steam engine in the ship Aberdeen. In the triple-expansion engine, the steam is channelled into two additional cylinders as it expands and cools, making the cycle much more efficient. The triple-expansion steam engine is an improvement on the simple- or single-expansion steam engine, which used steam only once before expelling it, leading to a cycle of heating and cooling of the cylinder with every stroke. Now on display, the engine is carefully oiled each day to keep it in working order. Missing and broken pieces were replaced before the engine was reassembled. ![]() It was dismantled to repair and clean each piece. Starting in 2005, the engine was the focus of a major two-year restoration project. The Museum purchased the engine from Marine Transport and Engineering in 1976. The Coast Guard decommissioned the ship in 1974, scrapping it two years later. This triple-expansion steam engine powered the Canadian Coast Guard Ship (CCGS) C.P.
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