Compact C

Common issues

• Stator elastomer wear or swelling from running dry or from fluid incompatibility
• Rotor wear reducing volumetric efficiency and self-priming ability
• Mechanical seal or packing gland leakage at the drive shaft
• Coupling/drive train misalignment causing vibration and premature bearing wear
• Loss of suction lift performance as stator interference wears down
• Overheating from prolonged dead-heading or closed-valve operation

Inspection checklist

• Check discharge flow/pressure against baseline to detect stator wear
• Inspect shaft seal or packing gland for leakage and adjust or replace as needed
• Confirm coupling alignment and guard condition
• Check for abnormal noise or vibration indicating rotor-stator contact wear
• Verify suction strainer is clear and suction lift is within the pump's rated range
• Check the elastomer compatibility record against the fluid actually being pumped

Service intervals

Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.

Typical wear limits

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

• Stator (elastomer, correct compound for the pumped fluid)
• Rotor
• Mechanical seal or packing set for the shaft
• Coupling element/insert
• Suction strainer element

Safety

• Never run dry, even briefly - dry running destroys the stator elastomer within minutes and can generate enough heat to be a burn or fire risk
• Isolate and lock out drive power before opening the pump casing or shaft seal
• Check elastomer chemical compatibility before pumping any fluid other than the original duty - an incompatible fluid can swell or degrade the stator rapidly

Class survey

Progressive cavity transfer pumps are not usually a dedicated class survey item unless part of a class-defined system (e.g. bilge or sludge transfer); class instead checks the system it serves - confirm the local requirement before treating this pump as a standalone survey point.

Estimated lifetime: Stator life is fluid- and duty-dependent; typically a few thousand up to around 10,000-15,000 running hours in clean transfer duty before elastomer replacement is needed - judge by wear trend rather than hours alone.