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CoC Oral Exam Preparation (Part – 16)_ CO2 Flooding System _ Marine Study | Valve | Carbon Dioxide
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11/25/2016 CoC Oral Exam Preparation (Part – 16): CO2 Flooding System | Marine Study
In CO2 flooding system, carbon dioxide bottles are placed in a separate room. The requirements for location,
accessibility, use and ventilation of CO2 storage spaces as per IMO are:
Spaces where entrance from the open deck is not provided or which are located below deck are to be fitted with
CO₂ room safety arrangement:
1. Exhaust fan, and suction duct is provided at the bottom of the room. Any accumulated CO₂ from leakage at the
bottom can be exhausted to atmosphere.
2. Cable operated Safety Valve is fitted on Pilot Cylinder discharge line.
It prevents accidental discharge of CO₂ from Quick Release Cylinders due to action of
leakage gas from Pilot Cylinder.
3. Relief Valves are fitted on each discharge line from cylinders so that leakage gas can safely dispose to
4. Check Valve is fitted in connection pipe between each cylinder discharge valve and manifold, so that leakage of
one cylinder cannot effect other cylinder.
5. Each bottle has a combined Bursting Disc, which will rupture spontaneously at a pressure of 177 bar at 63΄C.
6. Pressure Gauge and pressure Alarm in the manifold.
Maintenance of CO₂ flooding system:
1. Weekly inspection for alarm system.
2. Bottles should be weighed yearly; level checked by ultrasonic or radio active isotope detector. Level reference
mark should be provided. If 10% loss of weight, recharge them.
3. All the pulley, wire, rope and toggle must be free from dirt, scales and well lubricated.
4. CO₂ branch pipe and discharge nozzle should be cleared with compress air at two year interval.
5. Bottles should not be exposed to temperature of 60΄C.
http://marinestudy.net/coc­oral­exam­preparation­part­16­co2­flooding­system/ 1/6
CO₂ quantity shall be sufficient to give a minimum volume of free gas.11/25/2016 CoC Oral Exam Preparation (Part – 16): CO2 Flooding System | Marine Study Weighing of CO₂ bottle: 1.56 X 45) Machinery Space (Engine Room) CO2 Flooding Procedure: CO2 System operation in Machinery Spaces: A Co2 system of machinery spaces consists of a bank of Co2 bottles that can be operated from a remote place located away from the machinery spaces. http://marinestudy. CO₂ Quantity Calculation: (by Regulation): For cargo space. The Pilot cylinders are contained in a control box and are normally kept disconnected. equal to 40% of gross volume of machinery space so protected excluding the casing. The valves of the pilot cylinders will be opened with the help of the levers in the main CO2 control system. The system also consists of pilot Co2 cylinders which control the activation of the bank of Co2 bottles. So. 2. the coupling in plugged into the corresponding socket. Bottles should be weighed yearly by special weighing device designed for this purpose. equal to 30% of gross volume of largest cargo space so protected.4 x Machinery space gross volume) / (0.56 X 45) and Required CO₂ bottles for machinery space = ( 0. then. For machinery space. The system is connected to the pilot cylinders and the control box with the help of steel wires or flexible pipes. When the system is to be activated. if weight of CO₂ / bottle = 45 kg / bottle and Free gas volume of CO₂ = 0.3 x Largest cargo space gross volume) / (0. All these pipes are fitted with a quick action coupling.net/coc­oral­exam­preparation­part­16­co2­flooding­system/ 2/6 . Required CO₂ bottles for cargo space = (0. It has a reference mark to determine 10% loss of weight. CO₂ quantity shall be sufficient to give a minimum volume of free gas.56 m³/ kg.
Monitoring. 5. All these valves have an actuator which gets operated by the pilot pressure. 5. Machinery space fire fighting: by CO₂ flooding system: 1. 8. minimum. operate the gang release bar so that all CO₂ from quick release or total http://marinestudy. 10. master valve must be opened first. After opening the cabinet door. tanks. Two nos. All fuel pumps and quick closing valves of fuel tanks and fuel transfer line must be shut from remote control position. Machinery space minimum requirement: 1. 10 ft³ of sand and sawdust with scoops. after due consultation with the master of the ship. CO₂ flooding to machinery space must be done by master’s order. CO₂ must be released by competent engineer. 8. the main decision for CO2 flooding is taken by the Chief engineer. One fixed installation of CO₂ or foam or Halon.O. 4. 2 nos: of main fire pumps. detection and alarm system. All openings must be shut [ventilator flaps.11/25/2016 CoC Oral Exam Preparation (Part – 16): CO2 Flooding System | Marine Study The CO2 from the pilot cylinders will open the system’s main stop valve. With the opening of the master valve. CE.37 litres) foam or CO₂. Before releasing Co2 into the fire affected space. all ER crew to be counted. which then smothers the fire with the help of blanket effect. Pull the operating handle of pilot cylinders. The operating of a particular lever activates the pilot bottles. 6. Before releasing.e all skylights & ventilators are closed air­tight and pumpsumps supplying fuel oil should also be stopped in order to prevent re­ignition. 9. Inert gas system. This pilot gas operates the cylinders’ valves. The place is fully enclosed i. fire damper]. 4. 2. 9. 3. of 2 ½ gallon (11. Boundary cooling should be carried out. released from pilot cylinder.net/coc­oral­exam­preparation­part­16­co2­flooding­system/ 3/6 . 11. The detection of fire is done by various sensors installed in the machinery spaces.Though the opening of control box operates an alarm. Separate levers for each and every space are present inside the main controlling cabinet. CO₂ .O. of fire hydrants with hoses. The main stop valve has a piston which gets depressed due to the Co2 gas pressure and allows the pilot gas to flow to the bank of CO2 cylinders. 7. Drip pans and trays for every F. 6. When cabinet door is opened alarm will sound and all ER fans will be stopped. 3. it should be made sure that everybody is out of the place and total head should be counted. Semi­portable extinguishers of 45 kgs of CO₂. which helps in releasing the complete bank of bottles designated for that place. 7. and L. Portable extinguishers of at least 2 nos. Emergency fire pump. Co2 is flooded inside the fire affected space. International shore connection. depending on BHP. 2.
11/25/2016 CoC Oral Exam Preparation (Part – 16): CO2 Flooding System | Marine Study flooding cylinders will be released to machinery space. 6. it activates the CO2 alarm system of the ship. The sensors will detect any presence of smoke in the sample. By regulation. 10. As soon as the sensor detects smoke in the sample. a small indicator propeller is fitted. 85% of the capacity must be able to be released within 2 minutes. which ensures that the samples are taken. Remote detector fitted at the bridge can detect concerned cargo space. The only difference is that the cargo spaces have a different type of fire detection system. After ensuring no person left in cargo space. Manual operation procedure and amount of CO₂ bottle to be released is stated in CO₂ room. Before discharging. fire damper. For detection of fire in cargo hold. a sample of air is drawn from all the cargo holds by an extractor fan. 5. 4. Open the quick opening valve so that alarm will automatically initiated. A part of the sample is also discharged to the wheelhouse in order to cross­check the presence of smoke in the sample. Cargo hold fire fighting: by CO₂ flooding system: 1. hatch cover]. change 3­way valve to CO₂ discharge line so that connection to smoke detector is isolated. In order to check whether the extractor is extracting samples from the holds. http://marinestudy. This sample of air is passed through a cabinet wherein a set of smoke sensitive sensors analyze the sample. Cargo Hold CO2 Flooding System : The release mechanism of CO2 system in cargo spaces is same as that of the machinery spaces. This can be done by smelling the smoke. 2.net/coc­oral­exam­preparation­part­16­co2­flooding­system/ 4/6 . seal off the cargo space [closing of ventilation fan. The sample is later vented to the air. 3. This operation must be done by master’s order.
By master’s order. Remote and manual operation possible. clamps. Inspection to be recorded in log book and Saturday safety routine book. Key. 3. 3. No hazard for electrical equipment. 9. CO2 room key should be in position. Check exhaust fan / ventilation. Clamped against movement and vibration(by wooden plank). 2. 5. After discharging.net/coc­oral­exam­preparation­part­16­co2­flooding­system/ 5/6 . 8. Safety bursting disc at each CO2 bottle. Blow through the lines 4.11/25/2016 CoC Oral Exam Preparation (Part – 16): CO2 Flooding System | Marine Study 7. 6. Requirements of CO2 bottles: 1. Recharge if 5 % loss. Hydraulically tested to 228 bar. Advantages: 1. 2. 8. 4. Survey on CO2 flooding system: 1. Non return discharge valves after CO2 bottles. Check the operating instructions. Alarms etc. 3. Check CO2 weight every 2 years 2. 5. 8. 6. Emergency lights. 4. Topping up procedure must be followed at port arrival. Stop valve and pull handle are in lock release cabinet and alarm switch. Relief valves at manifold. General inspections in CO2 room: 1. Master valve with alarm switch. Leakage detecting pressure switch on manifold. Bursting disc fitted. 6. General inspection on Instructions. Safety devices on CO2 flooding system: 1. Check emergency light and all other lights. Store in temperature less than 55 °C 4. operates at 177~ 193 bar at 63 °C 3. 7. 7. All bottles stamped at 52 bar pressure. Check operating wire condition. Check all bottles overall condition. 2. 2. it leaves no residues and no damage to other parts. valves etc. Level tested (by radio active level indication). 5. Ventilation. release the correct amount to concerned cargo space. Testing of cylinder at 228 bars 3. if > 10 years internal and external examination required. Can permeate throughout the space. http://marinestudy. Check CO2 alarms.
Written by Marine Study “For Maritime Education and Knowledge” Related LNG Ships Guidance to Deck Officers While Loading Ignition Quality Parameters of Slow Speed November 12. only extinguished by smothering and inhibition. Fatal to life. and needs total sealing of the space. No cooling effects. 3. Leave a Reply Be the First to Comment! Notify of new follow­up comments Email › Start the discussion Marine Study Proudly powered by WordPress.net/coc­oral­exam­preparation­part­16­co2­flooding­system/ 6/6 . http://marinestudy. CO2 Flooding System. 4. 2016 Grain Diesel Engine In "Professional's Page" February 26. Re­ignition can occurs after fire is completely died out. CO2 Fixed Fire Extinguishing System. Bookmark the permalink. 2016 March 7. 2.11/25/2016 CoC Oral Exam Preparation (Part – 16): CO2 Flooding System | Marine Study Disadvantages: 1. 2016 In "Professional's Page" In "Marine Technology"  Share  Tweet  Share  Share  Mail  Print About Marine Study "For Maritime Education and Knowledge" View all posts by Marine Study → This entry was posted in Question & Answer and tagged CO2. Only suitable for confined space.
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