TACK WELDING -- Making short,
provisional welds along a joint to hold it in position and prevent distortion
during subsequent continuous welding.
TANK TOP -- Upper plating of a double bottom.
TEU-- Maritime abbreviation for "twenty-foot equivalent
unit" which refers to a container that is 20 feet in length (6.1 meter), 8
feet wide (2.4 meter) and a little over 8 feet high. See
FEU
THERMOCOUPLE -- A temperature measuring sensor. If two wires
of different metals are joined at their ends to form a loop, and a temperature
difference between the two junctions unbalances the contact potentials, a
current will flow round the loop. The temperature of one junction is kept
constant and the temperature of the other is indicated by measuring the
current.
THERMOSTAT -- An instrument that responds to changes in
temperature and directly or indirectly controls the temperature.
THERMOSTATIC STEAM TRAP -- A steam trap that opens by a drop
in temperature such as when cold condensate or air reaches it and closes it
when steam reaches it.
THRUST BEARING or THRUST
BLOCK -- A shaft bearing designed to take an axial load. It
consists of a plain bearing pads, a
Michell
bearing, or a ball bearing provided with lateral races.
TIE-ROD -- A structural member subject to tensile tension
only.
TREATED WATER -- Water that has been chemically treated to
make it suitable as boiler feed water.
TRIPLE EXPANSION ENGINE -- A steam engine
in which the steam expands successively in three cylinders of increasing size,
all working on the same crankshaft.
TUBE EXPANDER -- A tool used to expand the tubes into the tube
sheets, and also to bead over the ends.
TURN DOWN RATIO -- The ratio of a burner's maximum output to
its minimum output.
TUYERE -- The opening through which air is forced into a blast
furnace to facilitate combustion.
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