Central Cooler (Plate Type) · Heat Exchangers
Alfa Laval M20-MFG-MAX gasketed plate-and-frame heat exchanger from the M-line (marine main central cooling, LT/HT). Plate count 20-400, max flow rate 440 m3/h, design pressure 16 bar, max temperature 110 C. M-line is the workhorse industrial gasketed PHE — widely used for marine LT/HT cooling and engine cooling.
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| Performance monitoring (approach temperature, pressure drop trend) | continuous or monthly review |
|---|---|
| Opening for plate cleaning and gasket inspection | typically every 1-3 years depending on fouling rate and water quality - condition-based rather than fixed |
| Anode inspection/renewal (seawater side) | at each drydocking or per condition |
| Full gasket set renewal | on condition at each opening where gaskets show hardening, cracking or compression set - not a fixed calendar figure |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Gasket compression set | renewed when compression set or hardening prevents proper reseating per the maker's assembly gap specification - condition-based, not a fixed age |
|---|---|
| Plate wall thickness (corrosion/erosion) | renew individual plates once pitting or wastage is measurable against the maker's minimum thickness criterion for the M-line plate pattern |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
As a pressure-containing heat exchanger in the cooling system, class surveyors may check for evidence of pressure testing after opening, absence of uncontrolled leakage, and, where the unit interfaces with fuel or lube oil systems, confirmation that cross-contamination has not occurred.
Estimated lifetime: Gasketed plate heat exchangers of this type typically have a plate pack service life of 10-15+ years with periodic gasket renewal and cleaning; individual gaskets are commonly renewed at every opening (roughly every 1-3 years) rather than run to failure.
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