Central Cooler (Plate Type) · Heat Exchangers
Alfa Laval M20-MFG 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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| Opening for mechanical cleaning | typically annually, more often on raw seawater duty or if the fouling trend indicates it |
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| Gasket replacement | typically every 3-5 years or whenever plates are opened and gaskets show compression set |
| Tie bolt torque check | at each opening/reassembly |
| Differential pressure/performance trend review | continuous or monthly |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Plate wall thickness loss (erosion/corrosion) | commonly flagged for plate replacement once wall loss reaches roughly 20-30% of the original thickness - confirm against Alfa Laval's plate condition criteria for the M-line |
|---|---|
| Gasket compression set | no single numeric limit - replace once the gasket no longer seals reliably under a post-reassembly leak test |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Central cooling heat exchangers are typically included in the periodical survey of essential cooling systems; surveyors commonly expect to see pressure test records after any gasket renewal and evidence of a tie bolt torque re-check.
Estimated lifetime: Plates in this gasketed design are typically serviceable for many years with periodic gasket renewal; individual plate life is driven by water quality and duty rather than a fixed running-hour figure - track condition through periodic opening rather than hours run.
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