A device used to supply lubricant to packing. Usually located in the middle of the packing ring set.

The calculated horse power coming out of the pump using the formula WHP = head x gpm/3960

The metal has been stressed beyond its yield point and will not return to its original shape.

Surface voids caused by corrosion, erosion or cavitation.

A type of seal less pump that is pretty much limited to pumping clean lubricating liquids. Similar in concept to a canned pump.

An ion formed by the transfer of a proton from one molecule of water to another. Used to determine the pH of a substance. Each step increases by a factor of ten.

A method of reducing mechanical seal face loading by reducing the seal face closing area.

In metal bellows terminology it is the calculated diameter where the pressure penetrates between the metal plates. This number is used to determine the hydraulic balance diameter of the seal face.

Used with closed impeller pumps to restrict leakage from the high pressure side of the pump to the low pressure side. Should be replaced when the recommended clearance is doubled.

A seal design used to eliminate the use of elastomers. Excellent for cryogenic and hot applications. Not as effective for hot petroleum applications because of "coking" problems