a device which keeps material moving in a tank or vessel; the movement may be required to prevent settling and to mix material
arc of contact
surface contact between the sheave, the pulley and the belt, or the sprocket and the chain
axial flow
to flow along the axis of a fan or a pump
babbitt
material used in plain friction bearings (usually lead-based)
backlash
amount of clearance between mating teeth
bearing
device that allows two parts to rotate or move in contact with each other
blower
device that moves air at low or high pressures and volumes
centrifugal flow
to flow 90 degrees to the axis of a fan or a pump away from the centre
clutch
device used to engage or disengage a driver to a driven unit
condition-based monitoring methods
methods to identify issues not realized by sensory inspection, real-time data
conveying systems
system used to move material (usually solid) from one place to another
couplings
parts used to connect a driver to a driven unit
elastomeric element
flexible element used to join couplings and dampen energy
engineered lift
consulting an engineer for an approved design of a lifting apparatus or lifting procedure without exceeding the rated capacity of the rigging equipment; it should be noted that this is generally done when unusual circumstances of a lift dictate deviations from normal accepted trade practices
fans
device used to create air movement
ferrography
wear analysis of machine bearing surfaces by collection of ferrous (or nonferrous) wear particles from lubricating oil in a ferrograph analyzer
fluid
substance (either a liquid or gas) material that has the ability to flow
gear system
combination of gears used to alter the speed and power from a driver to a driven unit
hypoid gear
set of gearing whose shafts intersect on a different plane
maintain
keeping a machine or system running efficiently with a minimum amount of down-time; ror use in this analysis the term “maintain” can encompass: checking for worn parts, lubrication, adjustment, inspection and modification
manufacturers’ specifications
refers to the performance and engineering standards for a particular machine as detailed by the manufacturer; this information is usually available from drawings, manuals and bulletins provided by the manufacturer
multi-plane balancing
to balance a rotating part on more than two planes; multi-plane balancing is usually performed with computer software that is usually provided with vibration analysis and balancing instruments
non-destructive testing (NDT)
evaluation procedures that do not damage the material being tested; these may include magnetic particle testing, dye penetrant testing, and fluid sampling
positive displacement
transfer by pump without loss of pressure or material
predictive maintenance
activities utilizing information from past and current performance records to objectively predict mechanical problems; predictive maintenance is a proactive monitoring approach rather than a time-based or reactive approach
preventive maintenance
activities based on a periodic sampling and inspections; it normally involves the routine scheduling of maintenance activities; this schedule is based on past experience and manufacturers’ recommendations
prime mover
driver of the machine; it may be an electric, steam, gas or diesel powered
sensory inspection
inspecting through the senses (visual, hearing, feeling, smell)
service
for use in this analysis the term “service” refers to installing, diagnosing, repairing and maintaining
thermographic equipment
equipment that displays the temperatures of components by measuring infrared radiation
tooth contact
amount of engagement and pattern formed by mating teeth
tribology
the study of friction, wear, lubrication, and the design of bearings; the science of interacting surfaces in relative motion.
vibration analysis
the process of monitoring the condition of equipment and the diagnosis of faults in equipment through the measurement and analysis of vibration within that equipment