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Inspector Detail
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Common issues
- Gasket degradation or leakage at plate seals, especially with age or incompatible cleaning chemicals
- Fouling on the seawater side (biofouling, scaling) reducing heat transfer efficiency over time
- Plate corrosion/pitting, particularly with chloride-containing coolant or seawater in the circuit
- Cross-contamination between circuits from a failed or leaking plate, showing up as unexpected fluid mixing
- Reduced flow or rising differential pressure from fouling, requiring more frequent cleaning
- Frame bolt tension loss over time, contributing to gasket leakage
Inspection checklist
- Monitor and trend inlet/outlet temperatures and differential pressure across the cooler to detect fouling
- Visual inspection of plates for pitting, deposits and gasket condition when opened
- Check for external leakage at the frame/gasket interface
- Verify frame tightening bolt torque/compression length against the maker's specification
- Pressure/leak test after reassembly before returning to service
- Watch for cross-contamination (e.g. oil in cooling water, or a salinity change) as an indicator of plate leakage
- Check sacrificial anodes, if fitted on seawater-side end covers, for consumption
Service intervals
| Performance trending (temperature/differential pressure) | continuous, reviewed each watch |
| Opening for plate/gasket inspection and cleaning | typically every 1-2 years depending on fouling rate and water quality - confirm against the vessel's own PMS |
| Gasket replacement | at each opening where gaskets show compression set, hardening or damage |
| Sacrificial anode inspection/renewal (seawater side) | typically annually, or per observed consumption rate |
Critical spares
- Full gasket set matched to the specific plate pattern - Alfa Laval gaskets are plate-pattern specific, confirm the exact reference against the unit's nameplate rather than assuming compatibility across models
- Individual heat transfer plates, for replacing pitted or damaged plates
- Frame tightening bolts/nuts
- Sacrificial anodes, seawater-side end covers, where fitted
- End cover/connection gaskets and O-rings
Safety
- Frame bolts are under compression - follow the maker's tightening sequence and torque to avoid uneven loading or plate damage
- This is a pressurised system - isolate and depressurise before opening
- Seawater-side biological contamination risk during cleaning - standard hygiene precautions apply
Class survey
Central coolers in the seawater cooling system are checked for external leakage and general condition at machinery surveys; class does not normally require opening unless a performance or condition issue is reported. Note: the source listing for this entry reflects general Alfa Laval marketing content rather than one specific product model - the guidance above applies generically to Alfa Laval gasketed plate central coolers of the M/T-line family referenced in the specs (T6-T35, DN60-DN350).
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Dichtungen visuell auf Risse, Verhärtung, Quellung und Verfärbung inspizieren; Material-Kompatibilität mit Prozessflüssigkeiten überprüfen; ClipGrip™ Befestigung kontrollieren. Alterungserscheinungen und Elastizitätsverlust sind Austausch-Indikatoren.
A-Dimension gemäß Herstellerangaben mit Messschieber überprüfen (metallischer Kontakt erforderlich). Bolzen sauber halten und schmieren. Überdrehen vermeiden. Regelmäßiges Nachziehen nach Betriebsstunden durchführen. Bei zu niedriger A-Dimension Druckverlust und Leckage zu erwarten.
Druckdifferenz über Wärmetauscher überwachen (Anstieg deutet auf Ablagerungen hin). Wärmeleistung vs. Design-Wert prüfen. CIP-Intervalle nach Performance-Audits optimieren. Ablagerungen erzeugen höhere Pumpenleistung (Energieverschwendung bis 8.000 kWh/Jahr möglich).
Nach Demontage Plattenoberflächen auf Lokalmessungen (pittings), Risse und Lochfraß inspizieren. Materialkompatibilität mit Prozessflüssigkeit überprüfen. Ermüdungsrisse besonders an Ecken und Übergängen beobachten. Bei Lochbildung ist Platte unwiederbringlich und muss ersetzt werden.
Nach Demontage und Reinigung Hydrostatic Test gemäß Datenblatt durchführen. Prüfdruck typischerweise 1,5× Betriebsdruck. Externe und interne Leckage an allen Anschlüssen und Plattenrändern überprüfen. Befund dokumentieren.
Nach Öffnung Plattenfolge und Honeycomb-Muster überprüfen (korrigierte Chevron-Patterns müssen alternieren). 5-Punkt-Alignment System für größere Units aktivieren/validieren. Versatz oder Fehlplatzierung führt zu Kurzschluss und reduziertem Wärmevortrag.
Type-general inspection and maintenance points for this equipment category — not model-specific.
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