Oil Conveyor and Blue Baleen

Transcription

1 Oil Conveyor and Blue Baleen Napoleon Danberg This test was performed by Kaj Joensen, managing director of Faroe Maritime Technic, and supervised by Jegvan Hammer, pointed out by the Faroese department of The Norwegian Veritas.

2 Content Abstract... 3 Introduction... 3 The Test Facility and the Test Setup... 4 Process... 5 Oils and emulsions... 5 Sampling and Monitoring... 6 Result of test nr. 1 - Shell Marine Gasoil... 7 Result of test nr. 2 - Shell Gadinia 30 (lubricant oil)... 9 Result of test nr. 3 - Shell Omala 460 (Gear oil) Result of test nr. 4 - Medium emulsion (50% Omala / 50% water) Result of test nr. 5 - Heavy fuel oil Result of test nr. 6 - Heavy Emulsion(20%Omala - 30% IF % Water) Conclusion

3 Abstract The results from performance testing of the bilge water solution where skimming and oil absorbing filters, in all from gasoil to heavy emulsions, are presented. The skimming equipment in this test Oil Conveyor is designed by Faroe Maritime Technic and the oil absorbing filtration system Blue Baleen is designed by C.C. Jensen. This combination was tested down the engine room onboard the fishery inspection ship Tjaldrið, while lying alongside the quay in Fuglafjørður, in order to perform all six tests under real life conditions. The oils used varied from very light gasoil to heavy bunker water/oil emulsions with viscosities from 3,7 [cst] up to 2509 [cst] at 40 C. Each test contained an average amount of 400 litres of water and 30 litres of oil, distributed over a surface area in the bilge at 3m 2. The equipment tested was functioning satisfactory according to its design criteria. In all tests the Oil Conveyor managed to recover the oils in the bilge and the Blue Baleen system never reached values over 4 ppm, were some discharges showed 0 ppm. Introduction The skimming technology have in many years showed its potential in the oil spill industry, were its daily being used in huge as well as small tasks all over the world. The potential of skimming is to quickly collect and remove great amounts of oil and leave behind just a thin layer of oil. The oil absorbing filters are opposite, as they easily and effectively can filtrate small amount of oil down to 0 ppm, but can t handle great amount of oil caused by their small oil capacity. This test was therefore made to prove the potential of combining these two technologies in order to handle the oil spill onboard ships, also called bilge water. The bilge water is a daily treat environmentally as well as economically for all ship owners as well as engine crew. Skimming can keep the oil content in the bilge water at a minimum constantly, and give oil absorbing filters almost clear water to handle. Our hope with this test is to make more focus and see new possibilities in the way of handling bilge water in the future. 3

4 The Test Facility and the Test Setup With acceptance from The Faroese Fishery Inspection, Faroese Maritime Authority and The Norwegian Veritas, the test setup was installed and prepared onboard the Faroese fishery inspection ship Tjaldrið. As the diagram below shows, the Oil Conveyor was installed down the bilge. From the funnel of the Oil Conveyor, a hose pump transfer the collected liquid into the settlings tube, were the oil floats over into a 70 litres oil measuring tank and the remaining water was rejected from the settlings tube, back to the bilge. The Blue Baleen takes suction from the bottom of the keel and pumps up the remaining water through a 5 micron particle filter and then through the oil absorbing filter. The oil content in the water is measured by a Deckma omd-2005 ppm monitor that controls a 3 way valve, which decides if the water is clean enough to discharge overboard. In this test an extra separate ppm monitor is installed to make sure that all data logged are correct. In this report, data from the separate monitor are used as documentation in form of pictures of the monitor. Both monitors are also equipped with memory cards and records data back to 18 months. 4

5 Process Below each test is described step by step: 1. Water added to bilge 2. Oil added to the bilge (30 litres) 3. Oil Conveyor started skimming When no more oil was coming out of the settlings tube, the Oil Conveyor was stopped and collected liquid in the oil tank and remaining oil in settlings tube, was measured. 4. Blue Baleen system started discharging The Blue Baleen system discharged overboard until the input pipe was above the water surface and unable to collect more water. After all data was logged, a new test was started up and the process started all over again. Oils and emulsions The oils used in these tests are handed out by Shell to be based on the chart described in the DNV certification programme as DNV oil class 1, 2, 3 and 4. Also the two emulsions tests were based on DNV certification programme as DNV oil class 5 and 6. The chart below shows the oils: Viscosity at 40 deg/c (cst) Density at 15 deg/c (Kg/L) Amount (Litres) Comment: Shell Marine Gasoil 3,7 0,7 30 Very light bunker Shell Gadinia ,89 30 Light bunker Lubricant oil Shell Omala 460 Gear oil 460 0, Medium bunker Fuel Oil ,98 30 Heavy bunker (at 50 deg/c) Shell Omala 460/ Water Medium Emulsion Shell Omala 460/ Fuel Oil 380/ Water Heavy Emulsion The emulsions are prepared using water, Omala 460 and Heavy fuel oil 380. The medium emulsion contained 15 litres water and 15 litres of Omala 460, that were mixed until the emulsion was saturated with water. The heavy emulsion contained 15 litres water, 6 litres Omala 460 and 9 litres Fuel oil

6 After the emulsions were prepared, they were tipped down the sump, into the 400 litres of water. The blending ratio between oil and water is given in table below. Medium Emulsion Heavy Emulsion Diesel Gadinia 30 Omala 460 Fuel oil 380 Water 0 % 0 % 50 % 0 % 50 % 0 % 0 % 20 % 30 % 50 % The typical properties of the oils can be found in Annex 1.1 to 1.4. Sampling and Monitoring Before going into details of each and every test, a total overview of the results is given in the table below, that presents data about the efficiency and the recovery rate of the Oil Conveyor and displays the values that are discharged overboard through the Blue Baleen filtration system in all six tests. In the recovered liquid, the oil amount in settlings tube is also measured. Results of the test are: Test 1 - Shell Marine Diesel Test 2 - Shell Gadinia 30 Test 3 - Shell Omala 460 Test 4 - Medium Emulsion Test 5 - Heavy bunker Test 6 Heavy Emulsion Oil Conveyor Blue Baleen Liquid Litre of oil pr Water mixed Minimum Maximum Pressure recovered hour at [Hz] into logged logged Indicator [litres] recovered oil ppm value ppm value 31,5 4,28 litres 429 ppm 0 ppm 0 ppm 1,2 bar 50 Hz litres 5465 ppm 0 ppm 0 ppm 1,25 bar 30 Hz 31 6,3 litres > 6,3 % 0 ppm 0 ppm - 22 Hz 15,5 - >6,3 % 1 ppm 1 ppm 1,2 bar 32 5,7 litres 20 Hz 30 6,6 litres 20 Hz >6,3 % 1 ppm 4 ppm 1,2 bar >6,3 % 0 ppm 4 ppm 1,25 bar The average water temperature measured during the test period is 12,66 C and the average air temperature was 19,15 C. Other measured parameters can be found i Annex 2.1 to 2.6 On the next pages a detailed description of each test individually gives a more exact measuring from the ppm monitor in form of pictures. These pictures show the variation of oil content in the water discharged overboard during the whole discharging period. 6

7 Result of test nr. 1 - Shell Marine Gasoil (Started 25/ at 15:21 - Ended 26/ at 11:01) Test nr. 1 was made with Shell Marine Diesel. First 468 litres of water were tipped down the machine grave and then 30 litres of gasoil poured into the water. After a few minutes the Oil Conveyor was started up. After 16 hours and 55 min, the outlet of the settlings tube was not giving more liquid and the result of the skimming was as following: Skimming recovery rates: Liquid collected: 31,5 litres Litres collected pr/hour: 4,28 litres/hour (Sample taken after 1 hour and 34 min, at speed 50 Hz) Water content mixed into oil: 429,0 ppm (Sample taken after 1 hour and 34 min.) The results above shows, that 31,5 litres of liquid were collected and the oil sample showed a water content in the oil of 429 ppm. After the Oil Conveyor was stopped, the Blue Baleen filtration system was started. The system discharged overboard until the input pipe of Blue Baleen was above the water surface and unable to pump more water. Blue Baleen data: Started at: 10:26 o clock Pressure Indicator: 1,2 bar Ppm monitor 1 at 10:34 o clock: 0 ppm Ppm monitor 1 at 10:41 o clock: 0 ppm Ppm monitor 2 at 10:34 o clock: 0 ppm Ppm monitor 2 at 10:41 o clock: 0 ppm Stopped at: 11:01 o clock The ppm data described above are individually and taken visually during the test. They show that the Blue Baleen during the whole period filtrated down to 0 ppm. The pictures on next page are photographed from the extra measuring ppm monitor after the test. The bottom line of the monitor shows the ppm value during the whole pumping period, where each picture shows a ten minutes period. The reason why the extra measuring ppm monitor kept on logging data after the Blue Baleen had stopped pumping, was that the monitor was connected separate to a socket supply and had no connection to the Blue Baleen system. The data logged during test 1 can be found signed and approved in Annex 3.1 and 4.1. Also the laboratory result of water in oil can be found in Annex

8 Pictures taken of the extra measuring ppm monitor 8

9 Result of test nr. 2 - Shell Gadinia 30 (lubricant oil) (Started 26/ at 12:07 - Ended 26/ at 19:45 ) Test nr. 2 was performed using Shell Gadinia 30 lubricant oil. This time 415 litres of water were tipped down the machine grave and 30 litres of lubricant oil poured into the water and the Oil Conveyor started. After 6 hours and 58 min, the outlet of the settlings tube was not giving more liquid and the result of the skimming was as following: Skimming recovery rates: Liquid collected: 31 litres Litres collected pr/hour: 10 litres/hour (Sample taken after 1 hour and 8 min, at speed 30 Hz) Water content mixed into oil: 5465 ppm (Sample taken after 1 hour and 8 min.) The results above show that 31 liters liquid were skimmed up. This time the water content, mixed into oil had risen to 5465 ppm. Blue Baleen data: Started at: 19:14 o clock Pressure Indicator: 1,25 bar Ppm monitor 1 at 19:28 o clock: 0 ppm Ppm monitor 1 at 19:39 o clock: 0 ppm Ppm monitor 2 at 19:28 o clock: 0 ppm Ppm monitor 2 at 19:39 o clock: 0 ppm Stopped at: 19:45 o clock The ppm monitor again gave the value of 0 ppm on the discharge side and the pressure indicator raised 0,05 bar. The pictures on next page are photographed from the extra measuring ppm monitor after the test. The data logged during test 2 can be found signed and approved in Annex 3.2 and 4.2. Also the laboratory result of water in oil can be found in Annex

10 Pictures taken of the extra measuring ppm monitor 10

11 Result of test nr. 3 - Shell Omala 460 (Gear oil) (Started 26/ at 20:22 - Ended 27/ at 08:24 ) In test nr.3, 30 litres of Shell Omala 460 gear oil were tipped down the machine grave, where already 415 litres water were poured down, and then the Oil Conveyor was started up. After 11 hours and 20 min, the outlet of the settlings tube was not giving more liquid and the result of the skimming was as following: Skimming recovery rates: Liquid collected: 31 litres Litres collected pr/hour: 6,3 litres/hour (Sample taken after 1 hour and 46 min, at speed 22 Hz) Water content mixed into oil: Above 6,3% (Sample taken after 1 hour and 46 min.) The results above shows, that 31 litres of liquid were collected, but this time the water content in the recovered oil was above 6,3 %. The ppm monitor used for measuring the water content in the oil, was not able to measure higher values than 6,3% of water in oil and therefore we can t get the exact value for this test. After the Oil Conveyor was stopped, the Blue Baleen filtration system was started. Again the system pumped overboard until the input pipe of Blue Baleen was above the water and unable to pump more water. Blue Baleen data: Started at: 07:53 o clock Pressure Indicator: - Ppm monitor 1 at 08:03 o clock: 0 ppm Ppm monitor 1 at 08:21 o clock: 0 ppm Ppm monitor 2 at 08:03 o clock: 0 ppm Ppm monitor 2 at 08:21 o clock: 0-1 ppm Stopped at: 08:24 o clock The ppm data described above are individually and taken visually during the test. They show that the Blue Baleen during the whole period filtrated between to 0 and 1 ppm. The data logged during test 3 can be found signed and approved in Annex 3.3 and 4.3. Also the laboratory result of water in oil can be found in Annex

12 Pictures taken of the extra measuring ppm monitor 12

13 Result of test nr. 4 - Medium emulsion (50% Omala / 50% water) (Started 27/ at 09:00 - Ended 27/ at 14:35 ) In test nr.4, a medium emulsion containing 50% Shell Omala 460 and 50% water, was mixed before poured down to the 361 litres of water in the bilge. After 4 hours and 58 min, outlet of the settlings tube was not giving more liquid and the result of the skimming was as following: Skimming recovery rates: Liquid collected: 15,5 litres Litres collected pr/hour: - Water content mixed into oil: Above 6,3% (Sample taken after 3 hours and 6 min.) The skimming period of 5 hours shows that the Oil Conveyor easily and effectively can collect oil, emulsified with water. The recovered amount of 15,5 litres shows, that the settlings tube is able to separate the water from the oil again in medium emulsions. But still the water content in the recovered oil is over 6,3 % After the Oil Conveyor was stopped, the Blue Baleen filtration system was started. The system pumped overboard until the input pipe of Blue Baleen was above the water surface and unable to collect more water. Blue Baleen data: Started at: 14:08 o clock Pressure Indicator: 1,2 bar Ppm monitor 1 at 14:19 o clock: 1 ppm Ppm monitor 1 at 14:34 o clock: 1 ppm Ppm monitor 2 at 14:19 o clock: 1 ppm Ppm monitor 2 at 14:34 o clock: 1 ppm Stopped at: 14:35 o clock The ppm data described above are individually and taken visually during the test. They show that the Blue Baleen through the whole pumping period filtrates down to 1 ppm. The pictures on next page are photographed from the extra measuring ppm monitor after the test. The data logged during test 4 can be found signed and approved in Annex 3.4 and 4.4. Also the laboratory result of water in oil can be found in Annex

14 Pictures taken of the extra measuring ppm monitor 14

15 Result of test nr. 5 - Heavy fuel oil 380 (Started 27/ at 15:10 - Ended 28/ at 07:50 ) In test nr.1, 30 litres of heavy fuel was poured down the bilge together with 348 litres of water and then the Oil Conveyor was started up. After 15 hours and 4 min, outlet of the settlings tube was not giving more liquid and the result of the skimming was as following: Skimming recovery rates: Liquid collected: 32 litres Litres collected pr/hour: 5,7 litres/hour (Sample taken after 3 hours and 45 min, at speed 20 Hz) Water content mixed into oil: Above 6,3% (Sample taken after 3 hours and 45 min.) Again we see that more liquid is collected than oil was poured down in at the beginning of the test. The water content in the recovered liquid is still higher than 6,3%. After the Oil Conveyor was stopped, the Blue Baleen filtration system was started. The system pumped overboard until the input pipe of Blue Baleen was above the water and unable to pump more overboard. Blue Baleen data: Started at: 07:24 o clock Pressure Indicator: 1,2 bar Ppm monitor 1 at 07:29 o clock: 3 ppm Ppm monitor 1 at 07:43 o clock: 4 ppm Ppm monitor 2 at 07:29 o clock: 4 ppm Ppm monitor 2 at 07:43 o clock: 4 ppm Stopped at: 07:50 o clock The ppm data described above are individually and taken visually during the test. They show that the Blue Baleen is giving higher ppm values than in other previous tests. The reason might be that heavy fuel oil is adding particles to the water and giving it a gray colour, that might disturb the photo censor inside the ppm monitor. The pictures on next page are photographed from the extra measuring ppm monitor after the test. The data logged during test 5 can be found signed and approved in Annex 3.5 and 4.5. Also the laboratory result of water in oil can be found in Annex

16 Pictures taken of the extra measuring ppm monitor 16

17 Result of test nr. 6 - Heavy Emulsion(20%Omala - 30% IF % Water) (Started 28/ at 08:12 - Ended 28/ at 15:55) Test nr.6 is the final test in this report, and is performed by mixing 15 litres of water with 9 litres of IF380 heavy oil and 6 litres Omala 460 gear oil. The heavy emulsion was tipped down the bilge together with 401 litres water. And the Oil Conveyor was started. After 7 hours and 6 min, the outlet of the settlings tube was not giving more liquid and the result of the skimming was as following: Skimming recovery rates: Liquid collected: 30 litres Litres collected pr/hour: 6,6 litres/hour (Sample taken after 1 hour and 16 min, at speed 20 Hz) Water content mixed into oil: Above 6,3 % (Sample taken after 1 hour and 16 min.) The liquid collected proves that the Oil Conveyor easily can skim up the heavy emulsion, but the settlings tube is not able to separate the water from the oil again. After the Oil Conveyor was stopped, the Blue Baleen filtration system was started. The system discharged overboard until the input pipe of Blue Baleen was above the water and unable to collect more water. Blue Baleen data: Started at: 15:25 o clock Pressure Indicator: 1,25 bar Ppm monitor 1 at 15:33 o clock: 1 ppm Ppm monitor 1 at 15:50 o clock: 2 ppm Ppm monitor 2 at 10:33 o clock: 0 ppm Ppm monitor 2 at 10:50 o clock: 1 ppm Stopped at: 15:55 o clock The ppm data described above are individually and taken visually during the test. The pictures on next page are photographed from the extra measuring ppm monitor after the test. The data logged during test 6 can be found signed and approved in Annex 3.6 and 4.6 also the laboratory result of water in oil can be found in Annex

18 Pictures taken of the extra measuring ppm monitor 18

19 Conclusion The result of this test proves that skimming technology and oil absorbing filtration effectively can handle all kinds of bilge water, from light bunker to heavy emulsified bunker. Light bunker test gave values of oil content in water between 0 ppm and 1 ppm, while heavy bunker test gave values from 1 ppm to 4 ppm. During all tests the pressure over the filter was at t,2 to t,25 bar. This indicates that the filtration capacity has not been changed any noticeable during all six tests and proves to have a long lifetime when the oil content in the bilge water is skimmed to a minimum. The water content in the light bunker tests recovered oil, was from 0,0043% to 0,055%. In medium and heavy oiltests the water content in the oilwas above 6,3%oin alltests. To reduce the water content in the collected oil, it's recommended adding more heat to the settlings tube, in order to have a better separation. This test proved that the Oil Conveyor can skim all types of oils up from the sump onboard ships, and that the Blue Baleen filtration system can filtrate and discharge bilge water, to an oil content below 5 ppm. Faroe lslands,2011 ' -.faz?t:fl7// Kaj Joensen Manager Jegvan Hammer Supervisor 19