Simple Ships Centrifuge Operation Explained
We previously discussed the fundamental principle of operation of purifiers. Lets figure out how to start which will help prevent purifiers, and about necessary security precautions before starting, de-sludging procedures, and emergency stopping.
We are very mindful that centrifuges are a significant type of auxiliary equipment up to speed ships and that they are classified into two operating functions. One is really a clarifier, which separates solids from liquids. The other type can be a purifier, which separates liquids of numerous density. The Purifier operates on the principle of separation by centrifugal force. But in order to optimize the purification process, certain parameters needs to be adjusted before the purifier commences. Out of those parameters, extremely important parameters are:
1. Feed inlet oil temperature: Before entering the purifier, the dirty oil passes over the heater. This increases the temperature, thus reducing the viscosity with the oil being purified. The lower the viscosity, better will be the purification.
2. Density of Oil: As the dirty oil entering the purifier is heated to cut back the viscosity, the density also reduces. The lower the density, better mouse click the up coming document separation.
3. R.P.M from the rotating bowl: If the purifier have not achieved full RPM (revolutions per second), then the centrifugal force won't be sufficient enough to aid the separation.
4. Back Pressure: The back pressure must be adjusted following the purifier begins. The back pressure varies since the temperature, density, viscosity of feed oil inlet varies. The back pressure helps to ensure that the oil paring disc is immersed in the clean oil on how of pumping to the clean oil tank.
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Throughput of oil feed: Throughput means the amount of oil pumped in the purifier/hr. In order to optimize the purification, the throughput must be minimum.
Before starting a Purifier, following checks are incredibly essential:
1. If the Purifier begins after a overhaul, then check all fittings are fiited in right manner. The bowl frame hood locked with hinges.
2. Check the Oil level inside gear case. Ensure that it is exactly half inside the sight glass. Also ensure the sight glass is in vertical position, as there is often a common mistake of fixing it in horizontal position.
3. look at the direction of rotation of the seperator, by only starting and stopping the purifier motor.
4. Check whether the brake is in released position.
1. Ensure the lines are set and respective valves are open. Usually the lines are set from settling tank to service tank.
2. Start the purifier feed pump while using 3-way re-circulation valve able leading to settling tank.
3. Open the steam to the heater slightly ensuring the drains are open so that the condensate drains. close the drains once steam appears.
4. Start the Purifier.
5. Check for vibrations, look at the gear case for noise and abnormal heating.
6. Note the actual (amps) during starting. It goes high during starting after which when the purifier bowl picks-up speed and when it reaches the rated speed, the actual drawn drops to normal value.
7. Ensure the feed inlet temperature has reached optimum temperature for separation as stated inside the Bunker report and nomogram ( bunker delivery note gives the density from the fuel and taking advantage of this we are able to get the separation temperature and gravity disc size in the nomogram)
8. Now check if the bowl has reached the rated speed by going through the revolution counter. The revolution counter provides the scaled down speed with the bowl. The ratio for calculation can be obtained from your manual.
9. Now, following your bowl reaching the rated RPM, check for the actual attaining its normal value.
10. Open the bowl closing water/operating water, which closes the bowl. (Ensure sufficient water is present in the operating water tank)
11. Now after 10-seconds, open the sealing water towards the bowl.
12. The sealing water ought to be kept open till the water comes out in the waste water outlet.
13. Once the water overflows over the waste water outlet, stop the sealing water.
14. Now open the de-sludge water/bowl opening water. (This is done to guarantee the bowl has closed properly). During de-sludge we could hear a characteristic sound with the opening of the bowl.
15. Repeat the steps 10, 11 ,12 & 13.
16. Open the 3-way re-circulation valve in a way that the dirty oil feed is fed to the purifier.
17. Wait for the back pressure to formulate.
18. Check for overflowing of dirty-oil through waste water outlet & sludge port.
19. Now adjust the throughput to your value specified in the manual. Correspondingly adjust the rear pressure, too.
20. Now the purifier is put into operation. Change in the clean-oil filling valve to service tank.
Checks after starting the purifier during regular watches:
1. Adjust the throughput, back pressure, temperature of feed inlet if necessary
2. gear case oil level, motor amps, general leakages, vibration have to be monitored
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3. De-sludge every couple of hours for heavy oil purifiers & every 4 hours for lubricating oil purifiers. (Rrefer towards the manual or chief engineer instructions.)
Stopping of Purifiers:
1. De-sludge the purifier after stopping the feed inlet.
2. Shut down the steam inlet to the oil.
3. Stop the purifier after completing the bowl with water.
4. Apply brakes and produce up the purifier to complete rest.
5. If any emergency, the purifiers has emergency stops, on pressing it, will eradicate the purifiers immediately shutting off of the feed.
Thus we come across in detail the place to start the purifier after carrying out all safety checks so we have also seen the best way to stop it.