Shell Tube Oil Cooler for Steam Turbine

Shell-and-tube oil cooler is a critical component in a steam turbine system, ensuring the lubrication oil remains within optimal temperature ranges to prevent overheating and maintain viscosity.

Function of a Shell-and-Tube Oil Cooler in Steam Turbines

Heat Rejection – Cools hot turbine lube oil (typically 60–70°C) by transferring heat to a cooling medium (water, air, or a secondary fluid).

Viscosity Control – Maintains oil viscosity (~ISO VG 32 or 46) for proper bearing lubrication.

Contamination Prevention – Minimizes thermal degradation of oil, extending its service life.

Design & Construction

1. Shell-and-Tube Configuration

Shell Side: Usually carries the hot turbine oil (due to higher fouling tendency).

Tube Side: Circulates cooling water (or air in finned-tube designs).

Baffles: Improve heat transfer by directing oil flow across tubes.

2. Materials

Tubes: Admiralty brass, stainless steel (304/316), or titanium (for seawater cooling).

Shell: Carbon steel (with protective coatings) or stainless steel for corrosion resistance.

Key Performance Parameters

Heat Load: Typically 100–500 kW (depends on turbine size).

Oil Flow Rate: ~50–200 GPM (varies with turbine design).

Cooling Water Temp: ~30–40°C inlet (max 45°C to avoid oil overheating).

Pressure Drop: <10 psi (oil side) to avoid pump overloading.