Purifier starting procedure
1. Ensure valves are open; the lines are set from settling tank to service tank.
2. Start the purifier feed pump with the 3-way re-circulation valve in a position leading to a 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. If the steam controller is working fine, do not throttle the inlet/outlet valve of the steam line, open it fully By throttling the steam valve slowly the valve seat will erode causing steam to leak always.)
4. Start the Purifier motor.
5. Check for vibrations; check the gear case for noise and abnormal heating.
6. Note the current (amps) during starting. It goes high during starting and then when the purifier bowl picks up speed and when it reaches the rated speed, the current drawn drops to normal value.
7. Ensure the feed inlet temperature has reached the optimum temperature for separation as stated in the Bunker Analysis report and nomogram( bunker delivery note gives the density of the fuel and using this we can get the separation temperature and gravity disc size from the nomogram)
8. Now check whether the bowl has reached the rated speed by looking at the revolution counter if provided. The revolution counter gives the scaled-down speed of the bowl. The ratio for the calculation can be obtained from the manual.
9. Now, after the bowl reaches the rated RPM, check for the current attaining its normal value.
De-sludge Procedure
10. Open the bowl closing water/operating water, which closes the bowl. (Ensure sufficient water is present in the operating water tank or water line valve is open). close after 30 secs.
11. Now after 10 seconds, open the sealing water to the bowl.
12. The sealing water should be kept open till the water comes out of the wastewater outlet.
13. Once the water overflows through the wastewater outlet, stop the sealing water.
14. Now open the de-sludge water/bowl opening water. (This is done to ensure the bowl has closed properly). During de-sludge we can hear a characteristic sound at the opening of the bowl. then close. approx.3 seconds.
15. Repeat steps 10, 11, 12 & 13.
16. Open the 3-way re-circulation valve such that the dirty oil feed is fed into the purifier. observe the 3-way valve cylinder position
17. Wait for the back pressure to build up.
18. Check for overflowing of dirty oil through wastewater outlet & sludge port.
19. Now adjust the throughput to a value specified in the manual. Correspondingly adjust the backpressure, too.
20. Now the purifier is put into operation. Change over the clean-oil filling valve to the service tank.
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