Glossary

Efficiency, Hydraulic - The efficiency is defined as actual head that is produced by centrifugal pump to its ideal head. .

Elastance Loads - It's a load analogous to one produced by spring - when stretched, it tries to contract and vice versa as given by Hooke's law. .

Elastomer - Its elastic, rubber-like material that has elastic properties. At room temperatures, the same can be stretched to twice its original length and would snap back to original length upon release. These are used for seals, hoses as well as special enclosures. .

Electro-hydraulic - These are components that convert electric signal into hydraulic signal. .

EnBloc Manifold - These are manifold machined from solid block of metal and often containing large number of control elements that are interconnected by drilled passages. .

Equation of State - It's a mathematical expression that defines physical state of substance (gas/liquid/solid) by relating volume to pressure and to absolute temperature for given mass of substance. .

Equivalent Length - It's an expression for pressure loss of fittings and conduit interruptions in terms of equivalent length of straight conduit of specified diameter. F Frame - Its main structure of press containing cylinder(s) and working surfaces. .

Flange Connection - It's a block of metal where tubing or conduit is terminated and bolted to equipment or to companion flange to form union connection. .

Flash Point - It's the temperature at which liquid gives off sufficient flammable vapors to ignite when approached by small flame under carefully specified conditions. .

It refers to pump suction port that is pressurized by natural gravitational/elevated head of fluid. Here, the reservoir oil level is above pump inlet port or flooded by charging/booster pump. .

FMECA - "Failure Mode, Effects and Criticality Analysis" is procedure that is designed for documenting all conceivable potential failures of system/components, effect of each failure on system operation as well as identifying those that are critical to meeting operational success and personnel safety. G Gain Margin - It's the amount of control loop gain in decibels which can be increased before system reaches instability. .

Galling - Its an adhesion condition that arises from combination of materials that possess either poor bearing characteristics or are operated with improper/no lubrication. The wear mechanism also results in transfer of material from one member to other member where this causes extremely high force to move members relative to each other. Galling can also result in both members virtually locked together. Gauge Pressure - It's a pressure of system over and above atmospheric pressure where the difference between absolute pressure and atmospheric pressure. Its pressure used to calculate forces exerted in hydraulic system. .

Generated Contaminant - Its contaminant produced because of deterioration of surfaces, incompatible materials, various tribological wear mechanisms and others. A product of system activity and inactivity. .

Gland - Its the cavity of a stuffing box.