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Allweiler

SN 10-16

Screw Pump · Pumps

Class-certified type (DNV register) · technical data sheet not yet verified
Specifications

Technical data.reference — unverified

Pump Typescrew
Flow Rate (m³/h)10
Pressure (bar)16
Inspection

Inspector Detail

Common issues

  • Mechanical seal leakage from wear or dry-running
  • Screw/rotor clearance wear reducing volumetric efficiency and pressure
  • Relief valve set-point drift causing bypass at the wrong pressure
  • Bearing wear from misalignment with the driving motor
  • Coupling wear/misalignment causing vibration and premature seal failure
  • Air ingress at the suction side causing loss of prime or noisy running
  • Fuel contamination (water, particulates) accelerating rotor and bushing wear

Inspection checklist

  • Check the mechanical seal for leakage and correct flush/quench arrangement
  • Measure discharge pressure and flow against nameplate/curve values
  • Inspect coupling alignment between pump and driving motor
  • Check the relief valve setting against the specified bypass pressure
  • Inspect the strainer/suction filter for blockage
  • Check the rotor/screw set for wear where accessible, or via performance trend
  • Inspect the bearing housing for correct lubrication and abnormal noise/heat
  • Verify baseplate and foundation bolts are tight with no excess vibration

Service intervals

Mechanical seal inspectionannually or at first sign of leakage
Coupling alignment checkannually or after any pump/motor removal
Relief valve setting verificationannually
Strainer/suction filter cleaningper fuel quality, typically every 1-3 months
Bearing lubrication/grease renewalper the maker's schedule, typically every 2,000-4,000 hours

Typical wear limits

Rotor/screw radial clearancetypically renewed once running clearance has increased well beyond the as-new figure, since capacity and pressure fall off progressively - confirm exact figures against the Allweiler SN series manual

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

Critical spares

  • Mechanical seal kit
  • Screw/rotor set (matched power rotor and idler rotors)
  • Relief valve
  • Coupling flexible insert
  • Bearing set
  • Gasket/O-ring kit

Safety

  • Fuel service pumps handle flammable liquid under pressure - check for leaks before and during operation, no ignition source nearby
  • The relief valve must be correctly set and tested - an incorrectly set valve risks overpressure of the fuel line
  • Isolate and depressurize before opening the pump casing

Class survey

Fuel oil transfer/service pumps are within the general machinery survey scope; class will look for correct relief valve function, leak-free operation and, where duplicated, that the standby pump is proven operational. Keep pressure/flow trend records to support condition-based maintenance evidence.

Estimated lifetime: Screw-type fuel service pumps of this size commonly run 40,000-60,000+ hours between rotor set renewals under clean fuel conditions; contaminated fuel materially shortens this - treat as an approximate range only

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