Glossary
Guide to Selection of Continental Progressing Cavity Pumps
To properly select the best performing CONTINENTAL PUMP consideration should be given:
CAPACITY:
The rate of flow in Gallons Per Minute - GPM
PRESSURE:
How much Pressure is required to move the Liquid being Pumped thru the Discharge Port of the Pump depends upon the piping system and the kind of Liquid being handled. The difference between the Pressure required at the Pump Discharge and the Pressure being introduced into the Pump Sunction is the Differential Pressure and is expressed as Pounds Per Square Inch - PSI.
VISCOSITY
The resisance to the flow is expressed by various Scales of measurement, however, the most commonly used is CENTIPOISES. The Viscosity usually changes with Temperature and should always be considered. For conversion purposes the formulas set forth below can be of value:
Centipoises = Centistokes x Specific Gravity
Centipoises = SSU/5 x Specific Gravity
(SSU = Saybolt Seconds Universal)
TEMPERATURE
The Maximum and Minimum Temperatures at which the Fluid to the pumped are important factors in proper Pump Selection. High Temperature can cause distortion and sweeling of STATOR Materials and Low Temperatures can affect VISCOSITY that reflect in FLOW characteristics and Horsepower requirements.
OPERATING TIME
The Operating Cycle of the Pump should be considered - whether the Pump is to run continuously or intermittenly can be a factor in the selection of the Drive.
ABRASION
Classify the Abrasive characteristics of the fluid to be Pumped. Abrasives can look alike and appear to have similar properties, however, they can produce different wearing characteristics. Endeavor to classify the fluid broadly in order to select the proper Pump Construction and Operating Speed. The Classifications set forth below will serve as a guide and our experiences will be helpful:
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No Abrasives
For example: Clear Water - Gasoline - Fuel Oil - Lubricating Oil
Light Abrasives
For example: Dirty Water containing Silt and/or small amounts of Sand or Earth
Medium Abrasives
For example: Clay Slurries - Potters Glazes - Porcelain Enamel - Frit - Sludge - Wood Dust in Water
Heavy Abrasives
For example: Slurries containing large amounts of Sand - Emery Dust - Lapping Compounds - Mill Scale - Plaster - Grout - Roof Gypsum |
CORROSION
Whether the Fluid being Pumped is Neutral, Acid or Alkaline shoud be considered in selecting the proper materials of Pump Construction. The pH value of the Fluid should be known or determined-pH of 7 is Neutral, below 7 is Acid and above 7 is Alkaline. | 
