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Machinery space ventilation on board cargo ships
Ventilation is the provision of a supply of fresh untreated air through a
space. Natural ventilation occurs when changes in temperature or air
density cause circulation in the space. Mechanical or forced ventilation
uses fans for a positive movement of large quantities of air.
Natural ventilation is used for some small workshops and stores but is
impractical for working areas where machinery is present or a number
of people are employed.
Forced ventilation may be used in cargo spaces where the movement
of air removes moisture or avoids condensation, removes odours or
The machinery space presents another area which requires ventilation.
As a result of its large size and the fact that large volumes of air are
consumed a treatment plant would be extremely costly to run.
Ventilation is therefore provided in sufficient quantities for machinery
air consumption and also to effect cooling. The usual distribution
arrangement is shown in Figure
Fig:Machinery Space Ventilation
Several axial-flow fans provide air through ducting to the various
working platforms. The hot air rises in the centre and leaves through
louvres or openings, usually in the funnel. The machinery control room,
as a separate space, may well be arranged for air conditioning with an
individual unit which draws air through trunking from the outside and
exhausts back to the atmosphere.
- Refrigeration system components Centrifugal,reciprocating, or screw compressors. Modern Shell and tube type condensers.Various refrigerant types, refrigerant flow control valves & Ancillary fittings etc.....
- Modern refrigerants for cargo ships
In all refrigeration, heat is collected in a suitable fluid and this fluid is removed from the space substance being cooled carrying the heat with it. Such fluid known as refrigerant. All refrigerants using on board might be sub-divided into primary and secondary refrigerants.....
- Choice of refrigerants
Theoretically, almost any liquid can be used as a refrigerant if its pressure/temperature relationship is suitable for the conditions. Although no perfect refrigerant is known, there are certain factors which determine a refrigerant's desirability for a particular duty and the one selected should .....
- Cargo refrigeration procedure Refrigerated cargo vessels usually require a system which provides for various spaces to be cooled to different temperatures. The arrangements adopted can be considered in three parts: the central primary refrigerating plant, the brine circulating system, and the air circulating system for cooling the cargo in the hold.....
- How to troubleshoot refrigeration system faults
It is important that gas losses are minimized in systems. Gas used in this system is both expensive and a danger to health. The system is therefore to be kept in an absolutely gas-tight condition. On no account should the refrigerant be blown off to atmosphere. Before carrying out repairs the refrigerant should be pumped down to the liquid receiver or the condenser. The remaining gas should be vented off and the area well ventilated.....
- Safety precautions for refrigeration plant and refrigerated compartments Adequate information should be available on each vessel, laying down the operation and maintenance safeguards of the refrigeration plant, the particular properties of the refrigerant and the precautions for its safe handling.....
- Reefer container Individual containers with their own refrigeration plant are connected to the 440 or 220 a.c. sockets provided on deck. Systems designed for the cooling of refrigerated containers employ trunkings arranged so that containers stowed in stacks between built-in guide rails, can be connected to the suction and delivery air ducts of the ship's
refrigeration plant by bellows pieces operated pneumatically......
- Air conditioningSingle-duct & twin-duct marine air conditioning system - An air conditioning system aims to provide a comfortable working environment regardless of outside conditions. Satisfactory air treatment must involve a relatively 'closed' system where the air is circulated and
Marine machineries - Useful tags
Marine diesel engines ||Steam generating plant ||Air conditioning system ||Compressed air ||Marine batteries ||Cargo refrigeration ||Centrifugal pump ||Various coolers ||Emergency power supply ||Exhaust gas heat exchangers ||Feed system ||Feed extraction pump ||
Flow measurement || Four stroke engines || Fuel injector || Fuel oil system || Fuel oil treatment ||Gearboxes || Governor ||
Marine incinerator ||
Lub oil filters ||
MAN B&W engine ||
Marine condensers ||
Oily water separator ||
Overspeed protection devices ||
Piston & piston rings ||
Crankshaft deflection ||
Marine pumps ||
Various refrigerants ||
Sewage treatment plant ||
Starting air system ||
Steam turbines ||
Steering gear ||
Sulzer engine ||
Turbine gearing ||
Two stroke engines ||
UMS operations ||
Drydocking & major repairs ||
Critical machinery ||
Deck machineries & cargo gears
|| Control and instrumentation
||Engine room safety ||
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