TPC 305 PUMP COMPREHENSIVE QUESTIONS AND
ANSWERS SURE A+
✔✔Metering pumps - ✔✔Reciprocating pumps lubed by fluid pumped
✔✔Diaphragm pumps - ✔✔Hydraulic pressure
✔✔Rotary metering pumps - ✔✔Vane pumps
✔✔Magnetic drive pumps - ✔✔Leakage problem- sealless magnetic drive pump was
perfected
✔✔Centrifugal slurry pumps - ✔✔Renewable segments
✔✔Dry type sump pump - ✔✔Self priming
✔✔Vortex pump - ✔✔Fluid make little contact with impellor
✔✔Suction lift pumps - ✔✔Injection type stuffing box
✔✔Petroleum pumps - ✔✔Aluminum or Babbitt materials due to high temperatures
✔✔Packing less seal - ✔✔Boiler condensate forms the seal
✔✔Recurring seal failure - ✔✔Rough or corroded shaft
✔✔Lack of fluid pressure - ✔✔Indicates worn piston rings
✔✔ Lubrication film - ✔✔To lubricate means to make a surface smooth and slippery. It
also means to apply a lubricant. A lubricant is any substance that reduces friction by
creating a slippery film between two surfaces
, ✔✔Thickness of lubrication film - ✔✔Thickness of film is important, if thick enough, two
surfaces will never actually contact each other with little wear
✔✔Dampening shock - ✔✔That is, a lubricant can help to absorb the metal-to-metal
impacts that often occur in mechanical motion
✔✔Sealing action of lubricants - ✔✔The result is a very thin skin or scab that forms on
the exposed grease. This scab seals the grease in place and keeps dirt from entering
the bearing
✔✔Oil cooler - ✔✔May simply have metal fins to radiate heat into the air, although
some coolers have an active cooling device, such as a fan or even mechanical
refrigeration
✔✔Chemistry of Petroleum - ✔✔15% hydrogen and 85% carbon: hydrocarbons
✔✔Viscosity - ✔✔The single most important physical property of a lubricating oil
✔✔SAE and SSU - ✔✔The other rating system that applies to industrial lubricants used
in the US is Saybolt Seconds Universal
✔✔Choosing greases - ✔✔Chosen for applications where frequent lubrication is not
possible, or where a fluid lubricant would easily leak
✔✔Grease dropping point - ✔✔The temperature at which the grease begins to change
from a semisolid to a liquid. Also called melting point
✔✔Antifoaming agents - ✔✔Foam inhibitors, these additives break the air bubbles that
can form in the oil in a circulating system, hydraulic system
✔✔Extreme Pressure Additives - ✔✔First, through chemical reaction with the metal
surfaces, a thin coating of metal sulfide or chloride forms on the metal
✔✔Demulsifier - ✔✔Instead of suspending the water as fine droplets, we may need to
have it combine into larger globules, and settle out of the oil
✔✔Detergent-dispersant additives - ✔✔Organic salts that contain metallic elements,
such as barium, calcium, magnesium, cobalt, and strontium
✔✔Full-film lubrication - ✔✔Ideal condition in which two moving surfaces are completely
separated from each other
✔✔Lubricant choice - ✔✔Load, temperature, speed, and environment (surroundings)
ANSWERS SURE A+
✔✔Metering pumps - ✔✔Reciprocating pumps lubed by fluid pumped
✔✔Diaphragm pumps - ✔✔Hydraulic pressure
✔✔Rotary metering pumps - ✔✔Vane pumps
✔✔Magnetic drive pumps - ✔✔Leakage problem- sealless magnetic drive pump was
perfected
✔✔Centrifugal slurry pumps - ✔✔Renewable segments
✔✔Dry type sump pump - ✔✔Self priming
✔✔Vortex pump - ✔✔Fluid make little contact with impellor
✔✔Suction lift pumps - ✔✔Injection type stuffing box
✔✔Petroleum pumps - ✔✔Aluminum or Babbitt materials due to high temperatures
✔✔Packing less seal - ✔✔Boiler condensate forms the seal
✔✔Recurring seal failure - ✔✔Rough or corroded shaft
✔✔Lack of fluid pressure - ✔✔Indicates worn piston rings
✔✔ Lubrication film - ✔✔To lubricate means to make a surface smooth and slippery. It
also means to apply a lubricant. A lubricant is any substance that reduces friction by
creating a slippery film between two surfaces
, ✔✔Thickness of lubrication film - ✔✔Thickness of film is important, if thick enough, two
surfaces will never actually contact each other with little wear
✔✔Dampening shock - ✔✔That is, a lubricant can help to absorb the metal-to-metal
impacts that often occur in mechanical motion
✔✔Sealing action of lubricants - ✔✔The result is a very thin skin or scab that forms on
the exposed grease. This scab seals the grease in place and keeps dirt from entering
the bearing
✔✔Oil cooler - ✔✔May simply have metal fins to radiate heat into the air, although
some coolers have an active cooling device, such as a fan or even mechanical
refrigeration
✔✔Chemistry of Petroleum - ✔✔15% hydrogen and 85% carbon: hydrocarbons
✔✔Viscosity - ✔✔The single most important physical property of a lubricating oil
✔✔SAE and SSU - ✔✔The other rating system that applies to industrial lubricants used
in the US is Saybolt Seconds Universal
✔✔Choosing greases - ✔✔Chosen for applications where frequent lubrication is not
possible, or where a fluid lubricant would easily leak
✔✔Grease dropping point - ✔✔The temperature at which the grease begins to change
from a semisolid to a liquid. Also called melting point
✔✔Antifoaming agents - ✔✔Foam inhibitors, these additives break the air bubbles that
can form in the oil in a circulating system, hydraulic system
✔✔Extreme Pressure Additives - ✔✔First, through chemical reaction with the metal
surfaces, a thin coating of metal sulfide or chloride forms on the metal
✔✔Demulsifier - ✔✔Instead of suspending the water as fine droplets, we may need to
have it combine into larger globules, and settle out of the oil
✔✔Detergent-dispersant additives - ✔✔Organic salts that contain metallic elements,
such as barium, calcium, magnesium, cobalt, and strontium
✔✔Full-film lubrication - ✔✔Ideal condition in which two moving surfaces are completely
separated from each other
✔✔Lubricant choice - ✔✔Load, temperature, speed, and environment (surroundings)
