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
degrees of 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 gear teeth
basic measuring tools
these types of measuring tools have a direct scale on them (e.g., rules, tapes, plate protractor)
bearing
device that allows two parts to 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 to engage or disengage a driver to a driven unit
colinear shafts
shafts sharing the same axis
condition-based monitoring methods
methods to identify issues including data collection, data analysis, alert generation, maintenance planning and continuous improvement
conveying systems
system to move material (usually solid) from one place to another
couplings
mechanical elements to connect two colinear shafts together
elastomeric element
flexible element to join couplings and dampen energy and misalignment
engineered lift
A hoisting/lifting operation that has been planned and approved by an engineer. This type of lift is done when risks are greater due to load, shape, environmental conditions or other circumstances
fan
device to create air movement
fluid
substance (either a liquid or gas) that has the ability to flow
gear system
a mechanical arrangement that transmits motion and torque between gears to achieve specific changes (speed, direction or force)
hypoid gear
set of bevel gearing with non-intersecting shaft axes
maintain
keeping a machine or system running efficiently with a minimum amount of down-time; for use in this standard 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 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, x-ray, ultrasound and dye penetrant testing
positive displacement
moving a fluid by repeatedly enclosing a fixed volume and moving it mechanically through the system. The action can be driven by pistons, screws, gears, rollers, diaphragms or vanes
precision measuring tools
these types of measuring tools amplify the readers ability to distinguish measurements (e.g., micrometer, vernier caliper, vernier bevel protractor)
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
preventative maintenance
activities based on 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 wind, water, electric, steam, gas or diesel powered
sensory inspection
inspecting through the senses (visual, hearing, feeling, smell)
service
for use in this standard 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 gear 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 through the measurement and analysis of vibration within that equipment