Oily water seperator | Bilge water seperator | Oil and water Seperator — Transcript

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1. 0:00Oily water separator.
2. 0:03See the operation of an oily water
3. 0:04separator with a 15 ppm monitor. The
4. 0:08separation of oil water in the separator
5. 0:10takes place in two stages. In the first
6. 0:13stage, the separation is by gravity,
7. 0:16whereas in the second stage, the
8. 0:17separation is by coalescing filters.
9. 0:20Bilge pump delivers clean sea water to
10. 0:23the first stage of the separator through
11. 0:25the inlet valve. The vent is kept open
12. 0:28till all the air is removed from the
13. 0:30separator and water issues out.
14. 0:34Oily water is delivered to the
15. 0:36separator. As it enters through the
16. 0:38inlet valve, oil separates by gravity
17. 0:41and collects at the top of the
18. 0:42separator. The remaining oil sticks to
19. 0:45the baffle plates as the water passes to
20. 0:47the second stage. Oil droplets from the
21. 0:49plates tend to travel upwards to the oil
22. 0:52collection space.
23. 0:54Oil from the top of the chamber is
24. 0:56automatically drained to the oil tank
25. 0:59where the level reaches the bottom of
26. 1:00the sensor as shown. The oil drain valve
27. 1:03from the top of the first stage
28. 1:05separator is a diaphragm controlled
29. 1:07piston valve. Control air is supplied to
30. 1:10the diaphragm through a solenoid
31. 1:12operated pilot valve. The capacitance
32. 1:15probe senses oil quantity in the
33. 1:17collection space and energizes the
34. 1:19solenoid through the control switch.
35. 1:22Water passes downwards from the first to
36. 1:25the second stage coalescer through a
37. 1:27central pipe. The filter in the right
38. 1:29chamber
39. 1:30removes solids and some oil.
40. 1:33Coalescing filters in the left chamber
41. 1:36take out the remainder of the oil in the
42. 1:38form of small droplets, which coalesce
43. 1:40to form larger drops. These rise to the
44. 1:43oil collecting space.
45. 1:45Oil content of the final discharge is
46. 1:48below 15 ppm. In case the discharge of
47. 1:51water after the second stage is more
48. 1:53than 15 ppm, the monitor senses this and
49. 1:56gives an audible and visual alarm in the
50. 1:58engine room. At the same time, the
51. 2:01monitor sends a signal to the three-way
52. 2:03valve on the overboard discharge line,
53. 2:05which closes the overboard and opens to
54. 2:08the bilge tank. The sensor reverts to
55. 2:10normal operation once the oil content
56. 2:13drops below 15 ppm.
57. 2:16The test can be used to ascertain
58. 2:18the levels of oil and water manually. A
59. 2:20spring-loaded valve is usually fitted on
60. 2:23both discharges. However, it is
61. 2:26essential that a relief valve be
62. 2:28provided on the shell or incoming
63. 2:30mixture line to prevent overpressure and
64. 2:33accidental discharge to a confined space
65. 2:36or prevent overboard under all working
66. 2:38conditions. Such a relief valve should
67. 2:40be preferably led back to the suction
68. 2:42side of the supply pump or to an
69. 2:45overflow tank. The usual working
70. 2:47pressure for the separator is in the
71. 2:49region of two bar, that is, the pressure
72. 2:51at which the spring-loaded water
73. 2:53discharge valve is set. The relief valve
74. 2:55is set about two and a half bar
75. 2:57approximately.