Tandem seals
The seals are facing in the same direction with a low pressure
barrier fluid circulating between them.
T.D.H.
Total discharge head. A combination of the suction head and the
head being produced by the pump.
10-2 inches
A way to write 0.01 inches.
Tensile strength
The strength measured when the part is being pulled axially.
Thermal conductivity
A measure of the material's ability to conduct heat. This is
a very important factor in the selection of mechanical seal faces.
Thermal imaging
A troubleshooting piece of equipment that will let you see hot
spots in the equipment.
Thermoplastic
A plastic material that can be softened or melted repeatedly
without change of properties. Injection molded parts are manufactured
with Thermo-plastic materials.
Thermosetting
A plastic material that can be softened and molded but cannot
be re-used or reverted to its original state.
Thixotrophic fluid
The viscosity of the fluid decreases with agitation. Non drip
paint is an example of such a fluid.
Thrust bearing
Locates the rotor or shaft axially. Normally located clse to
the coupling.
Torr
One millimeter of mercury. Used in both the imperial and metric
systems a a unit of measurement in vacuum service.
Total head
The amount of head produced by th epump. Discharge head minus
suction head. If suction head is a negative number it is added
to the discharge head.
Thrust
In a centrifugal pump it refers to the axial movement of the
shaft. The thrust can be towards the wet or power end of the pump
and at start up it thrusts in both directions.
Thrust bearing
Designed to take the axial thrust in pump applications. It is
usually located next to the coupling and is often supplied in
a "double row" configuration.
Transducer
Attached to the pump and used to send a vibration signal to a
meter where it can be read.
Tungsten carbide
A common hard face seal material available in several grades
depending upon hardness and corrosion resistance. Cobalt and nickel
are the two most common types.
Turbulence
Disturbed fluid. Can cause cavitation problems in a centrifugal
pump. Often caused by an elbow located too close to the pump suction
inlet.
Two way balance
A method of balancing a mechanical seal in two directions. A
very important consideration in dual seal applications.