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NOV Mono

E041

Progressive Cavity Pump · Pumps

Technical data from manufacturer or class sources · not yet verified by a person
Example image: Progressive Cavity Pump — not a photo of this model.

Keeping your equipment running smoothly and efficiently is essential for any operation. The NOV Mono E041 is a progressive cavity pump model designed for demanding applications. This model features various stator options, each constructed from different materials to suit specific fluid handling needs. Available stator materials include Hypalon®, EPDM, Fluorocarbon (Viton®), Hydrogenated Nitrile, NBR (Nitrile), and PTFE (Teflon®). Each stator is designated with a unique model number, reflecting its specific material composition and construction. For example, the Mono E041 stator model designated Mo.E041.1N.STA.CK.NN is made from CSM (Hypalon®). Other stator models include those made from EPDM (Mo.E041.1N.STA.EK.NN), Fluorocarbon (Viton®) (Mo.E041.1N.STA.FK.NN), Hydrogenated Nitrile (Mo.E041.1N.STA.HK.NN), NBR, Nitrile (Mo.E041.1N.STA.NK.NN), and PTFE (Teflon®) (Mo.E041.1N.STA.RK.NN).

Specifications

Technical data.

Do you have the manufacturer datasheet for this model? Send it with the enquiry form — we check it and name the source.

Reference values — not verified
Temperature Range-10 to +110°C

Source: sps-pumps.com · not checked against a manufacturer datasheet

Inspection

Inspector Detail

Common issues

  • Stator elastomer wear or swelling from chemical incompatibility with the pumped fluid
  • Dry-running damage to the stator (localized burning/tearing) from loss of suction
  • Rotor wear from abrasive solids in the pumped medium
  • Universal joint or drive coupling wear from misalignment or overload
  • Mechanical seal or packing gland leakage
  • Reduced output from stator swell reducing the rotor-stator interference fit
  • Corrosion in the seal/shaft area in seawater or bilge service

Inspection checklist

  • Check dry-run protection / low suction level trip is functioning
  • Inspect stator bore condition visually or by feel where accessible
  • Check the drive coupling/universal joint for play or wear
  • Check the seal or packing gland for leakage and adjust/replace packing
  • Check discharge pressure and flow against rated performance
  • Inspect the suction strainer for blockage
  • Check alignment between pump and driver
  • Inspect mounting bolts and baseplate for looseness

Service intervals

Packing gland adjustment/inspectionmonthly or per running condition
Mechanical seal inspection4000-6000 hours or per maker's schedule
Stator/rotor condition checkannually, or immediately at first sign of output loss
Full overhaul (stator, rotor, seals, bearings)condition-based, typically 2-4 years in continuous duty
Universal joint lubricationper the maker's schedule

Typical wear limits

Rotor-stator interferencejudged by loss of rated output/pressure at correct speed rather than a fixed dimension - replace the stator when output can no longer be maintained
Universal joint playcheck against the maker's allowable backlash - confirm in the manual

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

Critical spares

  • Stator (elastomer element in the compound rated for the service fluid)
  • Rotor
  • Mechanical seal or packing set
  • Universal joint/drive shaft kit
  • Coupling element
  • Gasket/O-ring set

Safety

  • Never run the pump dry - rapid stator overheating can occur and, with flammable fluids, presents a fire risk
  • Isolate the electrical supply and depressurize the line before opening the pump
  • Pinch points at the rotor/stator interface and drive coupling
  • Confirm the stator elastomer is compatible with the pumped fluid before putting the pump into a new service

Class survey

Where fitted in bilge, sludge, or sewage service, class will check the pump is covered by the relevant piping system survey and that spare stator/rotor sets are carried onboard per the planned maintenance system.

Estimated lifetime: Elastomer stator life is highly duty- and fluid-dependent; a general planning range for marine service is on the order of 8,000-20,000 running hours before stator replacement, with abrasive or chemically aggressive media at the low end - treat as indicative only.

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