Central Cooler (Plate Type) · Heat Exchangers
Alfa Laval CB210 copper-brazed plate heat exchanger for marine industrial cooling. Plate count 20-250, max flow rate 155 m3/h, design pressure 33 bar. Part of the CB series for hot water, district heating, marine cooling and HVAC duties.
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| Performance check (approach temperature / pressure drop) | at each routine engine room round, trended monthly |
|---|---|
| Upstream strainer cleaning | monthly to quarterly depending on water source cleanliness |
| Chemical CIP cleaning | typically every 6-24 months depending on water quality - condition based |
| Visual leak and corrosion inspection | at each planned maintenance or class survey window |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Pressure drop rise above commissioning baseline | commonly used as a cleaning trigger once it rises on the order of 20-40% above the commissioning figure - confirm against the unit's own commissioning data, not a fixed number |
|---|---|
| Approach temperature rise above design | a sustained rise of a few degrees C above the design/commissioning approach temperature is a typical fouling indicator |
| Plate pack differential pressure baseline | record the reading at commissioning or last cleaning as the reference point - there is no single generic figure, since it depends on plate count and flow rate for the specific unit |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Central coolers are pressure-retaining parts and are typically covered under the general machinery/piping survey rather than as a standalone item; class wants evidence of correct material certification for the duty, pressure test records where renewed, and confirmation the cooling water system meets its rated flow and temperature. Where the unit is critical to a class-essential system, condition evidence may be requested at Continuous Survey Machinery intervals.
Estimated lifetime: Not meaningfully expressed in running hours - brazed plate coolers are normally retired on condition (persistent fouling or leakage) rather than an hours-based schedule; well-maintained units in this class commonly remain in service 15-25 years.
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