All About Engines
Forfatter: Edward Cressy
År: 1918
Forlag: Cassell and Company, LTD
Sted: London, New York, Toronto and Melbourne
Sider: 352
UDK: 621 1
With a coloured Frontispiece, and 182 halftone Illustrations and Diagrams.
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294 All About Engines
engine room, because the engineer in charge has
the responsibility of keeping up steam. This plan
is followed on all big ships. Each of the Maure-
tania's double-ended boilers is 22 feet long, 17 feet
3 inches in diameter, and weighs about 100 tons.
Every twenty-four hours they consume 1,000 tons of
coal, and the quantity required for a return voyage
between Liverpool and New York is equivalent to
twenty-two train loads, each train consisting of thirty
io-ton trucks.
To carry off the waste gases are four funnels,
oval in shape, about 100 feet high, with a long
diameter of 23 feet 7 inches and a short one of
16 feet 7 inches. The ashes are removed by means
of See’s ash ejectors. They are shovelled into
receptacles, swept upwards through an inclined
tube and over the side by a jet of water. This
is shown on the left-hand side of Fig. 170.
Propulsion is effected by four screws, two driven
by high-pressure and two by low-pressure turbines,
and two high-pressure turbines on the inner shafts
for going astern. The high-pressure “ ahead ” rotors
are 8 feet in diameter, mounted on hollow shafts
3 feet in diameter, with blades from 2J to 12 inches
in length (see Fig. 171 on Plate 27).
The rotor and shaft weigh 72 tons. The low-
pressure drums are 11 feet 8 inches in diameter on
shafts 4 feet 4 inches in diameter, with blades from
8 to 22 inches, and weigh 126 tons each. The length
of the casing for the high-pressure is 45 feet 8 inches,
for the low-pressure 48 feet 2 inches, and for the