AFGU 1-E-7
Atlas Danmark AFGU 1-E-7 — Marine Frischwasser-Generator, Eineffekt Basismobil.
Inspector Detail
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Common issues
- Scaling on plate heat exchanger surfaces reducing heat transfer and distillate output, especially at higher feed water temperatures
- Salinity alarm trips from ejector/condenser air leaks or brine carryover
- Vacuum ejector or vacuum pump underperformance reducing evaporation efficiency
- Plate gasket degradation causing internal leakage between the fresh and salt water circuits
- Feed water regulating valve fouling affecting brine density control
- Demister/separator fouling allowing salt water carryover into the distillate
Inspection checklist
- Check distillate salinity continuously via the salinometer and verify alarm/dump valve function
- Inspect the plate pack for scale build-up when opened for maintenance
- Check plate gaskets for hardening, cracking or leakage marks
- Verify vacuum level against the maker's normal operating range
- Inspect the demister/separator element for fouling or damage
- Check ejector or vacuum pump performance
- Verify feed and brine flow rates against maker setpoints
- Inspect plate pack tie bolts for correct torque and corrosion
Service intervals
| Acid cleaning/descaling of the plate pack | as needed based on output decline, commonly every 3-12 months depending on feed water quality - confirm against maker manual |
| Plate gasket inspection/replacement | at each plate pack opening, typically every 1-2 years |
| Demister/separator cleaning | every 3-6 months or at reduced output |
| Salinometer calibration | per maker recommendation, typically every 6-12 months |
Critical spares
- Plate pack gasket set
- Demister/separator element
- Salinometer sensor/probe
- Feed and brine valve seats/seals
- Ejector nozzle or vacuum pump service kit, depending on evacuation type
Safety
- Vacuum vessel implosion risk if opened without confirming the vacuum is fully released
- Hot surfaces on the heating medium side (steam or jacket water circuit)
- Chemical descaling agents - corrosive/irritant, requires PPE per the product's safety data sheet
- Confined space considerations if internal plate pack access requires entry into a larger casing
Class survey
Class typically confirms the freshwater generator produces potable-quality distillate within salinity limits and that the salinity alarm/automatic dump-to-bilge function operates correctly; records of periodic water quality testing are commonly requested.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Check vacuum gauge - must display >90%; pressure value >0.9 bar (negative); perform leak test if below setpoint
Half-yearly remove covers and inspect tube bundle for scale; check neoprene coating for flaking; inspect condenser tube side for sludging/sludge
Clean sensor electrode; calibrate salinometer against reference solution; perform regular function test; check sensor electrodes for wear
Check demister for fouling, corrosion and leakage; if leak suspected: inspect entire freshwater tank; chemically clean or replace demister if required
Check ejector inlet pressure ≥3 bar; check seawater inlet temperature to condenser (optimal 15-30°C); check ejector pump for wear; check filter for fouling
Type-general inspection and maintenance points for this equipment category — not model-specific.
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