Alfa Laval CB30 100kW AC cooling
Alfa Laval Alfa Laval CB30 100kW AC cooling — Alfa Laval Brazed & Fusion-Bonded Plate Heat Exchanger (CB / AlfaNova). Alfa Laval's brazed and fusion-bonded plate heat exchangers are compact, high-efficiency units for demanding marine and industrial applications. CB models employ stainless steel plates brazed with 100% copper in vacuum furnaces, while AlfaNova uses patented AlfaFusion technology combining all-stainless-steel construction (316) with stainless steel
Inspector Detail
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Common issues
- Internal fouling/scaling reducing heat transfer efficiency over time
- Leakage at brazed joints, often from thermal cycling fatigue or freezing
- Reduced flow from partial internal blockage, since a brazed pack cannot be opened for cleaning
- Corrosion of stainless plates in aggressive water quality (chlorides) without adequate treatment
- Freeze damage if the system is drained improperly or glycol concentration is insufficient
- Connection/pipe stress causing cracking at inlet/outlet stubs
Inspection checklist
- Check the approach temperature difference between circuits against the commissioning baseline
- Measure pressure drop across the unit and compare to baseline as a fouling indicator
- Inspect for external leakage at brazed joints and connections
- Check insulation condition where fitted
- Verify upstream strainers are clean and undamaged
- Review water treatment/chemistry logs for the cooling circuit
- Check mounting/support brackets for vibration damage or looseness
- Confirm glycol concentration, where used, is adequate for the expected minimum temperature
Service intervals
| Strainer cleaning | monthly or per fouling experience |
| Performance check (approach temp, pressure drop) | quarterly to annual |
| CIP chemical cleaning of the plate pack | condition-based, when performance drop indicates fouling - per Alfa Laval CIP guidance |
| Water treatment chemistry check | monthly |
| Visual leak inspection | at each engine room round |
Critical spares
- Complete replacement heat exchanger unit (brazed units are not field-rebuildable)
- Pipe connection gaskets/O-rings at flanged joints
- Strainer basket/element upstream of the unit
- CIP cleaning chemical for internal fouling removal
- Inlet/outlet pressure and temperature sensors for performance monitoring
Safety
- Pressure hazard - isolate and depressurize the unit before disconnecting any connection
- Chemical handling hazard during CIP cleaning
- Hot surfaces on the AC/HVAC-side circuit adjacent to the unit
Class survey
Class surveys of HVAC/AC cooling heat exchangers typically confirm pressure test history where applicable, absence of leakage, and that the unit matches the approved cooling system arrangement drawing. No internal opening is expected for a brazed unit, so survey relies on external condition and performance trending.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Visual inspection inside heat exchanger after opening plate package; UV light detection—white spots indicate water-soluble scaling, black spots indicate oil-soluble deposits. Monitor pressure drop across unit during operation as early fouling indicator. If fouling detected, perform optimized CIP (Cleaning-in-Place) with custom-formulated cleaning agents (2–4 hours typical duration). Backflushing (3× daily, 30-second pulses) may prevent accumulation.
During operation: inspect for any liquid weeping from gasket glands or plate boundaries—must be zero. Perform periodic integrity testing (recommended every 2 years per Alfa Laval): place donor fluid in primary path, recipient fluid in secondary path, apply positive pressure differential, monitor electronically for donor fluid leakage into secondary circuit. On brazed/fusion-bonded units (CB, AlfaNova), inspect solder/bond lines for microcracks using visual inspection and dye-penetrant testing if available.
Monitor inlet and outlet temperature differentials during operation. Document frequency and magnitude of temperature swings. For brazed CB units, be especially cautious—Alfa Laval notes brazed units are sensitive to large, sudden, frequent temperature changes. Inspect solder-joint interfaces during maintenance outages for hairline cracks. Check tightening torque of frame bolts according to Alfa Laval specifications; incorrect bolt load accelerates fatigue. Request Alfa Laval assessment if temperature cycling frequency exceeds design envelope.
Visually inspect all gasket grooves when plate package is opened—look for cracks, discoloration, swelling, or hardening. Confirm gasket material compatibility with both heat transfer media (check Alfa Laval compatibility matrix). If cracks detected or if unit has been in service >5–7 years, replace gaskets with certified Alfa Laval equivalents using correct groove placement procedure. After replacement, perform torque-down sequence per manual and conduct integrity test before restart.
After opening plate package, inspect plate surfaces under good lighting for pitting, discoloration, or rust staining—prioritize gland/seal areas and plate corners where stagnation may occur. In marine service, perform visual assessment annually or after seasonal lay-ups. For high-corrosion marine duty, verify AlfaNovaM (all-stainless-steel) is in use rather than standard CB (which may have dissimilar metals). Confirm flush/circulation program is followed to prevent salt/sediment accumulation. If pitting observed, consult Alfa Laval on material upgrade or replacement.
Monitor differential temperature across inlet and outlet on each circuit. Uneven temperatures indicate distribution maldistribution or internal blockage. Inspect plate inlet and outlet ports visually for debris or sediment before opening. Compare actual thermal performance (capacity, outlet temperature) against design baseline—significant drop indicates fouling or flow restriction. If blockage suspected in narrow channels, perform flushing with appropriate solvents (per CIP protocol) or request Alfa Laval chemical cleaning. Verify inlet filtration is active to prevent future particulate ingress.
Type-general inspection and maintenance points for this equipment category — not model-specific.
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