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Boiler glossary T |
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| 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) 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 a high-pressure, intermediate-pressure and a low-pressure cylinder, working on the same crankshaft. Sometimes with two low-pressure cylinders. Consequently four cylinders but expansion in three steps. 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. |
© 2007 Lars Josefsson Boilers