This guide provides maintenance and troubleshooting information for MOYNO progressing cavity pumps, covering geometry, wear, temperature, and viscosity effects.
The manual explains the geometry of progressing cavity pumps, describing the rotor and stator design, cavity formation, and how these affect flow. It also outlines the three major application variables—abrasion, temperature, and viscosity—and their impact on pump performance.
Detailed sections cover failure analysis cases, recommended operating limits, and maintenance practices such as speed restrictions, pressure safeguards, and material selections for high‑temperature or abrasive service conditions.
| Maximum design speed | 419 rpm |
|---|---|
| Maximum speed with VFD | 544 rpm (78 Hz) |
| Pressure safety shut‑off | 80 psi |
| Stator elastomer temperature range | 70 °C to 130 °C (swells) |
| CPS to RPM relationship | 1000 CPS = 150 RPM |
The pump’s maximum design speed is 419 rpm.
The high‑pressure safeguard is set to shut off at 80 psi.
Stator elastomers swell between 70 °C and 130 °C and shrink below 50 °C, changing the rotor‑stator fit.
The rotor should be undersized for temperatures above 130 °C to maintain proper fit.