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Heishin (Mohno Pump Brand)

NZF/TNZF Series - NZF, TNZF dewatered cake pressure feed pumps

Progressive Cavity Pump · Pumps

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

Heishin (Mohno Pump Brand) NZF/TNZF Series - NZF, TNZF dewatered cake pressure feed pumps — Marine sludge dewatering and cake conveying systems.

Inspection

Inspector Detail

Common issues

  • Stator (rubber element) wear or swelling from chemical incompatibility or dry running
  • Rotor wear reducing discharge pressure and flow
  • Mechanical seal or packing gland leakage
  • Blockage from oversized solids or fibrous material in the sludge/cake
  • Coupling/universal joint wear on the rotor drive
  • Motor overload trips as the stator wears or the discharge line blocks

Inspection checklist

  • Check discharge pressure and flow against the baseline for the duty
  • Inspect mechanical seal/gland packing for leakage
  • Check motor current/load trend for signs of increasing resistance
  • Inspect stator condition, where accessible, for swelling, cracking or wear
  • Check coupling/universal joint grease and play
  • Check inlet hopper/feed screw, if fitted, for blockage or wear
  • Verify safety guards and emergency stop function
  • Check relief valve setting and function, if fitted

Service intervals

Mechanical seal/packing checkper PMS, typically monthly
Stator/rotor inspectioncondition-based, commonly every 2,000-4,000 running hours depending on duty
Coupling/universal joint lubricationper maker schedule, typically every 3-6 months
Gearbox/reducer oil changeper maker recommendation, typically annually

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

Typical wear limits

Stator bore conditionrenew once interference fit with the rotor is lost and slip occurs - assessed by discharge pressure/flow drop against baseline, no fixed figure

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

Critical spares

  • Stator, correct elastomer grade for the material handled
  • Rotor
  • Mechanical seal or packing set
  • Universal joint/coupling repair kit
  • Gearbox/reducer seals

Safety

  • High-torque entrapment hazard at the pump inlet and rotating coupling - guard before operation
  • Pressure hazard if the discharge line is blocked while the pump keeps running - verify relief protection is in place
  • Handling of sludge/cake material - follow site biological/chemical exposure procedures

Class survey

Sludge/bilge handling pumps are typically part of the MARPOL Annex I oily water and sludge management equipment reviewed at survey; class will check that discharge/flow capability still meets the approved system design and that relief protection is in place.

Estimated lifetime: Progressive cavity pump stator/rotor sets in sludge/cake duty commonly need renewal in the 2,000-6,000 hour range depending on material abrasiveness and dry-run incidents - confirm against Heishin's own data and site history

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