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Library› Engine Room› Oily Water & Waste Systems› Sewage Treatment Plant› Hamworthy/Wartsila ST6A
Hamworthy/Wartsila

ST6A

Sewage Treatment Plant · Oily Water & Waste Systems

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

Hamworthy/Wartsila ST6A — Medium sewage treatment for marine vessels and small offshore platforms.

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
BOD Loading6.00 kg/day maximum

Source: dokumen.tips · not checked against a manufacturer datasheet

Inspection

Inspector Detail

Common issues

  • Aeration blower failure or reduced air delivery, causing incomplete biological treatment
  • Disinfection unit (chlorinator/electrolytic cell) fouling or electrode wear
  • Discolored or odorous effluent from insufficient retention time or a blower malfunction
  • Level sensor/float switch fouling causing pump short-cycling or tank overflow
  • Macerator or inlet screen blockage
  • Air diffuser fouling reducing oxygen transfer
  • Discharge/transfer pump seal wear or clogging with wipes/rags

Inspection checklist

  • Check aeration blower operation and air pressure/flow to the diffusers
  • Assess discharge water clarity and odor as a rough process indicator
  • Test the disinfection unit output where fitted
  • Check level switches and high-level/pump-failure alarms
  • Inspect and clean the macerator and inlet screen
  • Confirm the sample point is accessible for BOD/TSS testing
  • Check discharge valve interlocks that prevent discharge in restricted areas per MARPOL Annex IV
  • Inspect the tank interior for solids buildup at dry-docking or other opportunity

Service intervals

Blower filter/oil checkper manufacturer, typically every 500-1000 running hours
Diffuser cleaning/inspectionannually or when air distribution becomes uneven
Disinfection electrode/cell cleaningquarterly or per manufacturer
Macerator blade inspectionevery 3-6 months depending on usage
Full internal tank inspectionat dry-docking or per class interval
Effluent quality testingper flag state/MARPOL Annex IV requirement

Typical wear limits

Effluent quality (BOD/TSS/coliform)must meet the standard in the plant's own type approval certificate (e.g. IMO Res. MEPC.227(64)) rather than a generic figure
Diffuser air distributioneven bubbling across the diffuser bed - an uneven pattern indicates fouling or blockage needing cleaning

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

Critical spares

  • Aeration blower belt/filter set
  • Air diffuser membranes
  • Level float switches
  • Macerator cutting blades
  • Discharge pump seal kit
  • Disinfection electrode, where fitted

Safety

  • Confined space entry hazard for internal tank inspection - test the atmosphere and follow the enclosed space entry procedure
  • Biological/pathogen exposure when handling sludge or effluent - PPE and hygiene required
  • Electrical hazard around blower and pump motors in a wet environment
  • MARPOL Annex IV restricts discharge distances/areas - do not discharge unless the plant is confirmed operating correctly

Class survey

The plant is subject to MARPOL Annex IV survey requirements and IOPP/Sewage certificate renewal. Class checks the type approval certificate validity, effluent sampling where required, and correct function of any discharge valve interlocks/logging.

Estimated lifetime: Typical service life is 15-20 years for the tank and structural components; blowers, pumps and electrical/electronic controls are usually replaced or overhauled within 8-12 years.

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