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Compatible models: Caterpillar 3512B V12 diesel generator sets, main power 1275-1360 kW (60Hz)/1600-1700 kVA (50Hz). The engine comes with SCAC independent low-temperature intercooler circuit + jacket water high-temperature circuit, featuring an integrated high-low temperature remote dry cooler, eliminating cooling tower water consumption. Supports new project integration and 1:1 replacement of old equipment, strictly customized according to Caterpillar's original thermal balance calculation and on-site boundary conditions.
Cooling Circuit Overview (CAT 3512B Original Cooling Logic)
HT High-Temperature Circuit Jacket Water (Cylinder Jacket Water Circuit)
Function: Cylinder liner and cylinder head cooling, controlling engine operating temperature
Medium: Ethylene glycol aqueous solution (Caterpillar Extended Life Coolant) Cat
Typical operating condition: inlet water 88-92°C / return water 75-82°C, thermostat fully open at 92°C
The heat dissipation value is taken from the thermal balance sheet of the CAT project and serves as a reference, not directly used for selection purposes.
LT Low Temperature Circuit SCAC (Separate Circuit Aftercooler Independent Intercooler Circuit)
Function: Turbocharged intake air cooling; protects intake air temperature to prevent power loss in high-temperature environments
Typical operating conditions: The loop thermostat maintains a minimum of 30°C, with inlet water at 34-41°C / return water at 44-52°C.
- ⚠️ The LT circuit and HT circuit are completely independent, with two sets of water pumps inside the engine. Internal cross-flow between the dry cooler coils is strictly prohibited.
Key Design Features for CAT 3512B HT-LT Dry Cooler
1. Two fully independent coil bundles
HT coil and LT coil are physically isolated, supplied as a single complete unit, fully matching the flow and pressure drop requirements of the 3512B cylinder liner water and SCAC intercooler circuits. The flange connection positions and interface dimensions can be replicated according to the old equipment drawings, enabling 1:1 replacement and minimizing on-site pipeline modifications.
2. Custom design based on thermal calculations
Import CAT original thermal rejection data + project boundaries, output a comprehensive thermal calculation report to avoid high-temperature alarms and unit power reduction during summer heat.
3. Multi-grade anti-corrosion options
Standard configuration: copper tube with aluminum fin + epoxy impregnated anti-corrosion coating; hot-dip galvanized whole machine frame
Corrosive conditions (coastal, dust-prone industrial areas): stainless steel tube - stainless steel fin, resistant to salt spray and industrial atmospheric corrosion.
4. VFD variable-speed axial fan group
The HT and LT circuits can independently adjust speed based on temperature linkage; 4-20mA signal output, compatible with unit A-III electrical control or power plant DCS system; optional redundant fan configuration, meeting 24-hour continuous unattended operation requirements.
5. Pre-installed accessories
Automatic air vent, drain valve, sensor mounting base, vibration damping support; optional rain cover, fan safety screen, maintenance platform; closed-loop glycol circulation, dry cooling, zero water consumption.
6. Mechanical layout options
V-type / H-type / horizontal remote radiator; select the model based on the occupied area outside the equipment room and the air intake/exhaust conditions to avoid hot air backflow.
