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NOV Mono

D22

Progressive Cavity Pump · Pumps

Technical data from manufacturer or class sources · not yet verified by a person

In demanding marine environments, reliable pumping systems are essential for efficient operation and maintenance. NOV Mono offers a range of Eccentric Screw Pumps designed for a variety of demanding applications. These pumps are known for their robust construction and ability to handle abrasive and corrosive fluids. The Mono D22 is one model in this series, featuring a stator with various material options to suit different fluid types. Available stator materials include CSM (Hypalon®), EPDM, Fluorocarbon (Viton®), Hydrogenated nitrile, NBR, Nitrile, and PTFE (Teflon®). Each stator material offers specific properties and resistance to various chemicals and temperatures. NOV Mono also provides a comprehensive range of spare parts, ensuring easy maintenance and minimizing downtime for these critical pumps.

Inspection

Inspector Detail

Common issues

  • Stator wear or swelling from chemical incompatibility with the pumped fluid, reducing capacity
  • Rotor wear reducing pump efficiency and increasing slip
  • Mechanical seal or packing leakage
  • Dry-running damage to the stator elastomer if the pump is started without adequate fluid present
  • Coupling or universal joint wear on the drive shaft
  • Excessive discharge pressure from downstream blockage causing overload trips
  • Bearing wear in the gearbox or drive end

Inspection checklist

  • Check pump capacity and discharge pressure against baseline performance
  • Inspect the mechanical seal or packing gland for leakage
  • Check stator condition, where accessible, for swelling, tearing or chemical attack
  • Inspect the rotor for wear and coating condition
  • Check the drive coupling and universal joints for play and wear
  • Verify dry-run protection, if fitted, operates correctly
  • Check motor and gearbox bearing temperature and vibration
  • Inspect the suction strainer for blockage
  • Check alignment between the pump and driver
  • Verify the relief valve, if fitted in the discharge line, is set correctly and operable

Service intervals

Mechanical seal or packing inspectionevery 2,000-4,000 hours or per observed leakage
Stator and rotor condition checkannually or per performance drop-off
Gearbox oil changeper maker's schedule, typically annually
Coupling and universal joint inspectionannually
Suction strainer cleaningper operating condition, at least monthly

Critical spares

  • Stator, elastomer grade matched to the pumped fluid compatibility
  • Rotor
  • Mechanical seal or packing set
  • Universal joint or coupling kit
  • Gearbox oil
  • Suction strainer element

Safety

  • Pumps handling wastewater or chemical residues require appropriate PPE and isolation before seal or stator work
  • Stored pressure in discharge piping - depressurise before disconnecting
  • Rotating drive shaft and coupling guards must be in place before running
  • Confirm the pump is isolated and drained before opening for stator or rotor replacement, particularly on chemical or wastewater duty

Class survey

Where this pump serves a class-relevant system such as sewage treatment discharge, surveys typically check that discharge performance and any required treatment process indicators remain within approved limits, alongside standard machinery maintenance record review.

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By manufacturer HeishinNOV MonoAllweilerNetzschSeepexINOXPAHolland Air PumpsBornemannWatson-MarlowGroeneveld-BEKAMono (NOV)INOXPA S.A.U.All manufacturersSpare parts by equipmentNew here? Create a free account Can't read the plate? Try the nameplate scanner More like D22
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