Description
There are three methods employed for water-cooled marine petrol and diesel engines: direct, heat exchanger and keel cooling. Direct cooling of the cylinders and heads by seawater is unsatisfactory because the engine which was probably originally designed for radiator cooling – will run too cold and the sea-water will eventually ruin the cylinder block and heads. Keel cooling is suitable for small boats operating in shallow weedy water, but the need for pipework external to the hull is a severe limitation. Heat exchanger cooling is the most common method, the seawater being isolated in components that can be designed to withstand its corrosive effect.
Alfa Marine Heat Exchangers are fabricated with a distinctive spiral corrugated tube design. Its compact structure for effective use with high fluid velocities and low-pressure drops. The tube stack is fully floating, thus minimizing thermal stresses, and it can easily be removed should cleaning be necessary. Most marine products are made of cupronickel, stainless steel 316L or titanium which are highly corrosion resistant and therefore suitable for use with seawater. Some of the smaller units are fitted with neoprene end covers which can fit directly into the seawater pipework.
Specifications
- Model Options
SS316L: DC50, DC60, DC90, DC120
Titanium: DC50ti, DC60ti, DC90ti, DC120ti - Marine Port (BSPT): 1",1 1/4", 1 1/2"
- Engine Port (BSPT): 1/2",3/8"
- Max Working Pressure on Engine Water Side: 15 bar
- Max Working Pressure on Sea Water Side: 15 bar
- Max Working Temperature：200 degrees C
- Warm Tips: Kindly send the size of ports you need to support@alfaheating.com after the order placed.
*Customization Service
Mounting brackets are available.
We produce customized applications on different working pressure and temperature.
Lead time is typically up to 14 days or longer depending on project complexity.
For customization requests and technical review, please contact: support@alfaheating.com
Limited Warranty of Heat Exchanger.pdf
Application Scenarios
Marine Engine Cooling Systems: Marine DC type shell and tube heat exchangers are widely used in diesel engine cooling systems for boats, yachts, and commercial vessels, helping transfer heat efficiently between engine coolant and seawater.
Boat & Yacht Seawater Cooling: Ideal for small boats and yachts requiring reliable seawater heat exchange, ensuring stable engine temperature even under high load conditions.
Ship & Offshore Equipment Cooling: Used in marine and offshore platforms where continuous cooling is required for engines, hydraulic systems, and auxiliary equipment.
Industrial Cooling Applications: Suitable for industrial processes requiring corrosion-resistant heat transfer between fresh water and seawater or other fluids.