Marine Type Heat Exchangers

About:

The Marine Type Heat exchangers are the most common way to cool a boat’s engine, using the lake, river or ocean water in which the boat floats and also there are three methods employed for water-cooled marine petrol and diesel engines.

Specifications of Marine Type Heat Exchangers:

• A water-jacketed exhaust manifold is necessary on marine engines to reduce the temperature of the engine-room air space and the exhaust pipe.
• If the exhaust manifold is in the sea-water circuit it should be installed with the sea-water inlet at the back and the outlet at the front on the top to ensure that it operates completely full of sea-water.
• The engine is being used to drive auxiliary equipment in a ship and the sea water supply is taken from the ship’s main, ensure that the recommended flow rate cannot be exceeded.

Applications of Marine Type Heat Exchangers:

• This arrangement is particularly suitable for small series-produced engines; the manifold is cooled by fresh water and as a result a keel-cooled engine can be made by omitting the heat exchanger tube stack and the sea-water pump.
• On installation the fresh-water outlet from the manifold would be connected to the keel pipes and the return taken back to the engine fresh-water pump. Heat exchanger and manifold assemblies are heavier than ordinary marine manifolds and must therefore be supported on the underside using the fixing lugs provided.
• When automotive engines are being converted for marine use the existing centrifugal-type pump should be retained for the fresh-water circuit and an additional pump fitted the sea-water circuit.
• Gear Oil Coolers Fuel Coolers Hydraulic Oil Coolers Diesel Fuel Return Coolers Combination Coolers in Tandem Lube Oil Coolers.

Advantages:

• The manifold is in the fresh-water circuit a small by-pass hole must be provide to ensure that some water is circulating through the manifold at ail times. Our development is to combine a water jacketed exhaust with the heat exchanger and header tank.
• The sea water pipe bore should be chosen so that the velocity does not exceed 2 m/sec on the suction side and 3 m/sec on the discharge side of the pump.
• The exchangers are very high efficient and best product.  High Quality design with high heat transfer ability. The advantages and problem areas with different heat exchanger types and materials are discussed.  Marine heat exchanger is its size, cost and ease of adapting existing cold water systems to hot.  Researchers, over the years, have used a variety of heat exchanger types and materials.  The application of heat exchangers to large scale marine aquaculture

Methods of Marine Type Heat Exchangers Maintenance:

     Note: Prior to Maintenance, isolate the heat exchanger by shutting off the line valves for both medium and media; and drain the remaining liquid using the drain cock. The Vent must be open to ensure everything is drained from the heat exchanger.

• If the deposits on the heat exchanger are not so hard, then they can be removed using a wire brush.
• If the deposits are stubborn, chemical cleaning should be used by emersion of the part in chemical solution.
• Depending on the type of the heat exchanger, there are tools provided by the manufacturers for the cleaning purpose. For e.g. there are special tools for cleaning shell and tube type heat exchangers.
• Once the cleaning is done, the heat exchanger must be flushed with fresh water to remove any remaining chemical or dirt from the surface.
• In sea water cooled heat exchanger, anodes are fitted on the cover to prevent it from galvanic corrosion. Anodes must be checked and changed if required.
• Always renew the cover gasket if it is damaged during opening of heat exchanger.
• In oil coolers and heaters, fouling can take place on the outside of the tubes as well. This can be removed by chemical flushing.

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