Radial

• 90 degrees to the centerline of the shaft.

Radial bearing

• In an end suction centrifugal pump it is the bearing located closest to the stuffing box. This bearing handles most of the radial loads put on the impeller.

Reaction bonded

• A method of manufacturing silicone carbide mechanical seal faces. These materials are sensitive to caustic and some other high pH liquids.

Renkin scale

• Used to measure low temperatures in the Fahrenheit scale. Similar to Kelvin which is used to measure low temperatures in the Centigrade system.

Repeller

• A second impeller used to lower the stuffing box pressure.

Reverse balance

• A common type of hydraulic balance used on outside mounted mechanical seals.

Rigid shaft

• A shaft with a rotating speed lower than its first critical speed.

RMS

• Root mean square. A measure of surface finish or smoothness. Metric uses C.L.A. or centerline average for the same purpose.

Rockwell "C"

• The scale most often used to measure hardness of the hard seal face.

Rotating seal

• When the spring loaded or moveable portion of the seal rotates with the shaft.

Run out

• Twice the distance that the center of the shaft is displaced from the axis of rotation.

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