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Low Pressure CO2 Systems

For more details visit or call 0871 8732404


For more details visit or call 0871 8732404

L ow Pressure C O 2 Systems Danfoss Semco low pressure CO2 systems are intended for use where large machinery and cargo spaces require protection with carbon dioxide. he advantage of the low pressure system is that one single tank replaces a large number of CO2 cylinders with an approximate saving of 50% in weight. he tank, main valves, distribution valves, refrigerators, and associated controls are supplied prewired and ready assembled on a common steel frame. he quantity of carbon dioxide is shown directly by an electronic gauge indicating the actual tons of CO2 in the tank. he gauge unit is itted with alarm contacts for warning at low CO2 contents in the tank. Recharging ater use is made directly from a truck. For large vessels the installation cost of a low pressure CO2 system is considerably lower compared to the installation costs of a high pressure CO2 system. he system is designed to meet the requirements of the appropriate classiication societies to which the vessel is being built.

TANK. he tank is constructed as a steel pressure vessel in accordance with the classiication society requirements. he tank is equipped with two safety valves, which are itted to a three way change-over valve, thus one safety valve is connected to the vessel if the other one is out of operation. he tank unit is supplied complete and ready for use, installed on a rectangular steel framework and held in position by thermally insulated supports. he tank is insulated with non-lammable polyurethane foam protected by an aluminium cover. REFRIGERATION UNITS. he refrigeration units are installed at the end of the tank on the support frame and are completely duplicated both mechanically and electrically. he refrigerant is environmentally friendly and the cooling circuits on the compressors and condensers are suitable for either seawater, fresh water or air-cooling. he tank is maintained at a temperature of –18°C, which is equivalent to a CO2 storage pressure of 2.1 MPa. CO 2 LEVEL INDICATION. An electrical capacitance type liquid gauge is itted and the meter is calibrated from zero tank contents to tank full. he indicator has an accuracy of +/- 2% and is itted with an alarm switch indicating minimum illing level. To meet rule requirements an overill valve and a level sight tube with isolation valve is itted. CONTROLS. A pre-wired operating panel is installed at the end of the tank on the support frame, at which are

For more details visit or call 0871 8732404


For more details visit or call 0871 8732404

grouped all controls and overload relays for the refrigerators, tank pressure, level indicators, and various indicators and warning lamps. he panel is completely watertight and itted with cable glands. VALVES AND FILLING CONNECTIONS. he automatically operated main stop valve and distribution valves are ball valves itted with manual override. he valves are sized so that the appropriate quantity of carbon dioxide will be discharged in accordance with the rule requirements. To prevent ice formation on the valves the main outlet pipe from the tank is located at the top of the tank as a continuation of the tank dip tube. he tank is illed by a truck through twin illing and balancing lines led from the tank to deck level port and/or starboard. Isolation valves and hose connections are itted to these lines. RELEASE OF CARBON DIOXIDE. Remote release of the required quantity of gas to a particular space is made from master control boxes located as required. he release system utilises the CO2 pressure from the tank to actuate the main stop valve and the distribution valve via pressure operated control valve, and these valves are arranged for remote operation from the master control box. When the appropriate quantity of carbon dioxide




Length (air cooled +145)


14 12 10 8 6 4 2 0

Tank ∅2200 3000 mm 2805 mm 1225 mm 2695 mm

Tank ∅2400 3200 mm 3000 mm 1340 mm 2900 mm


Tank dia. ∅1800 and 2200 Weight empty Metres

Tank dia. ∅1800 and 2200 Length excl. air cooling

Tank ∅1900 2800 mm 2460 mm 1080 mm 2420 mm

0 5 10 15 20 25 30 35 40

Max. CO2 content in tons

14 12 10 8 6 4 2 0



Tank ∅1800 2600 mm 2415 mm 1025 mm 2270 mm

0 5 10 15 20 25 30 35 40 Max. CO2 content in tons

has been discharged, the distribution valve is closed automatically by means of a solenoid operated control valve actuated by the electronic timer. DISTRIBUTION SYSTEM. he distribution valve is connected to a computer calculated piping system within the protected space and to which the CO2 nozzles are connected. he piping is dimensioned so that the required quantity of gas will be discharged within the prescribed time and at no point in the piping system will the pressure fall below 1.05 MPa which would cause freezing at the nozzles. All designs and sizes are available on request

For more details visit or call 0871 8732404


For more details visit or call 0871 8732404

he Danfoss Semco QA system is in accordance with EN ISO 9001: 2000 and is certiied by DNV. Our ongoing internal training programs make our employees - naval architects, sales engineers, project managers, service engineers etc. – fully qualiied to handle our ire ighting systems for the marine industry. An important element is the use of an approved computer program for hydraulic calculations, which secures a quick and precise system design.

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Danfoss Semco - Low Pressure CO2 Systems