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launch-type boiler: a small fire-tube boiler used in launches and smaller steam yachts. A horizontal cylinder in form, with a cylindrical furnace and multiple fire-tubes. They have some resemblance to a small Scotch boiler or Huber boiler, but with the fire-tubes extending beyond the furnace end, rather than folded back as a return-tube boiler ...
The water level of these boilers was around 3/4 of the height of the tube tiers, [3] so that the upper tubes were filled with steam rather than water. Above the tube banks a single flat spiral tube was used as an economiser or feedwater heater. [2] The furnace used to fire these large boilers was annular, often with four or more separate firedoors.
This small tube diameter gave a high heating surface, but probably too much: the ratio of surface to volume became excessive and gas flow through the tube banks was affected, giving the boiler furnaces something of a reputation as poor burners. [4] Downcomers were used, either the usual two large pipes, or an unusual but characteristic ...
The older fire-tube boiler design, in which the water surrounds the heat source and gases from combustion pass through tubes within the water space, is typically a much weaker structure and is rarely used for pressures above 2.4 MPa (350 psi). A significant advantage of the watertube boiler is that there is less chance of a catastrophic failure ...
They were developed by Yarrow & Co. (London), Shipbuilders and Engineers and were widely used on ships, particularly warships. The Yarrow boiler design is characteristic of the three-drum boiler: two banks of straight water-tubes are arranged in a triangular row with a single furnace between them. A single steam drum is mounted at the top ...
Studs are used to hold the insulation together and on the wall of the furnace. They are placed about 1 ft (300 mm) apart in this picture of the inside of a furnace. The tubes, shown below, which are reddish brown from corrosion, are carbon steel tubes and run the height of the radiant section. The tubes are a distance away from the insulation ...
The fire-tube boiler developed as the third of the four major historical types of boilers: low-pressure tank or "haystack" boilers, flued boilers with one or two large flues, fire-tube boilers with many small tubes, and high-pressure water-tube boilers. Their advantage over flued boilers with a single large flue is that the many small tubes ...
A series of small tubes that are part of one giant coil, usually made of steel, have feed water pumped through at great speed. The water is pumped from the top of the steam generator down to the bottom and out. The tubes that are arranged in such a way that the combustion gasses pass around the tube subsequently heating the water.
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