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Pump Room > Purifier > Flashcards

Purifier Flashcards

1
Q

Purpose of the centrifugal purifier

A

Separate and remove water, solids, and emulsions from JP5 during stowage to service tank transfers

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2
Q

What kind of purifier is it AKA?

A

A constant-efficiency type of separator. Same degree of efficiency at the end of a run as at the beginning

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3
Q

Define centrifugal force ?

A

A force which impels a thing outward from a center of rotation

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4
Q

Components of a purifier ?

x23 components

A
  • frame
  • brake
  • speed indicator
  • oil fill cap
  • worm wheel and drive assembly
  • spindle assembly
  • bowl casing
  • bowl cover
  • feed tube assembly
  • spring loaded T handle
  • water discharge chamber
  • inlet and outlet connection
  • bowl assembly
  • distributor
  • intermediate disc
  • top disc
  • paring disc
  • bowl top
  • coupling ring
  • discharge ring
  • coupling nut
  • A/C motor and controller
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5
Q

Frame

A

It’s bolted to base plate and secured purifier to ship foundation.
- it houses all the drive components

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6
Q

Brake

A
  • Used to stop bowl rotation , emergency use only
  • hand operated.
  • handle up - brakes on
  • handle down - brakes off
  • brakes must be off prior to purifier operation
  • brake drum is attached to drive assembly
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7
Q

Speed indicator

A
  • used to determine rotations per minute .
  • button on cap provides a speed count
  • operating speed for purifier in 146-152 BPM. Bumps per minute
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8
Q

Some ships use 200 GPM purifier , what should be BPM

A

146-150 BPM

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9
Q

Oil fill cap

A

Use to add oil.

- has a dipstick in center to determine level

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10
Q

Oil sight glass

A
  • has a retaining ring and clear glass for viewing oil level
  • white line for high oil level
  • red line for low oil level
  • oil reservoir holds 8-8 1/2 quarts of grade 90 gear oil.
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11
Q

Worm wheel and drive assembly

A
  • Connects the purifier to the motor shaft by a flexible coupling
  • horizontal drive shaft is supported by 2 ball bearings ( outer and inner )
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12
Q

Worm wheel is keyed to the drive shaft and engages the worm quill at the bottom of spindle assembly to provide what?

A

Provide the drive rotation to the spindle

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13
Q

A smaller gear of worm wheel gear assembly is used to drive what?

A

Drive the speed counter

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14
Q

How is the worm wheel and drive assembly lubricated ?

A

By splash action in the oil reservoir

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15
Q

Where is the worm wheel and drive assembly located?

A

Within the frame

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16
Q

Spindle assembly

A

Provides drive rotation to the bowl assembly

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17
Q

Spindle assembly consists of what?

A

Consist of a shaft with an attached worm quill that meshes with the worm wheel

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18
Q

Spindle assembly supported by how many bearings?

A 
Upper bearings (2)
Upper/lower bearings (2)
Lower bearings (2)
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19
Q

Bowl casing

A

Bolted at the top of the frame , and houses the rotating bowl shell assembly

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20
Q

Bowl casing has a ratchet hook that what?

A

Locks the bowl in an open position for service and inspection

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21
Q

Bowl casing drain line extends where ?

A

From the bottom of the bowl casing

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22
Q

Bowl casing has how many bowl shell lock screws and how many bowl shell plugs?

A

2 each

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23
Q

What are the bowl shell lock screws and bowl shell plugs do?

A

They help disassemble of the bowl shell assembly

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24
Q

Bowl shell screws must be removed and plugs installed prior to what?

A

Prior to operation

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25
Q

How many bowl cover clamps lock the bowl cover to the casing ?

A

3 cover clamps

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26
Q

O rings do what

A

Provide a seal between the casing and bowl cover .

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27
Q

How many O rings are there ?

A

2

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28
Q

How many inlet and outlet connections?

A

2 -With flanges and connections to piping

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29
Q

The housing of the inlet and outlet connections serve as what?

A

They serve as a hinge pin for the bowl cover .

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30
Q

Bowl cover provides what?

A

It provides a sealed enclosure over the top of the bowl casing as the purifier is in operation.

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31
Q

The bowl cover covers what?

A

The rotating assembly

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32
Q

Hinges on the bowl casing, when in the open position , the cover is what?

A

Automatically locked in place by the locking hook

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33
Q

The bowl cover houses what?

A

The inlet and outlet lines . And are flexible

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34
Q

Feed tube assembly

A

It provides a passage for dirty JP5 to the top of bowl.

35
Q

Feed tube assembly contains what?

A

Seal water inlet and a purified JP5 outlet

36
Q

Feed tube assembly contains a regulating tube which does what?

A

It directs feed inlet to the center of the distributor.

37
Q

Regulating tube is made of ?

A

Nylon, to prevent sparking

38
Q

Feed tube assembly is bolted where ?

A

To the top of the cover

39
Q

Spring loaded “T” handle assembly

A

It screws into paring disc and raises paring disc to complete the upper seal .
-it has left handed threads and remains down when screwed into paring disc

40
Q

Water discharge chamber

A

Receives water displaced over the discharge ring .

  • discharges into water outlet connection of bowl casing.
  • it contains an observation port for visual check of discharges water
41
Q

Inlet and outlet connections

A

They have rubber seals to prevent leakage between pipes and tubes .

42
Q

Inlet and outlet connection seals are located where ?

A

Directly over the motor , and any leakage of the seal will cause a fire

43
Q

Bowl assembly

A

Provides a working area for separation of contaminants from the JP5

44
Q

The bowl assembly is driven by the what?

A

Driven by spindle through the worm drive assembly

45
Q

The bowl assembly transmits motion to JP5 and provides what?

A

The necessary centrifugal force to cause separation to take place

46
Q

Bowl assembly capacity ?

A

300 GPM at 60-90 degrees F.

47
Q

Bowl speed of bowl assembly ?

48
Q

Bowl assembly contains what?

A

The water seal during operation.

49
Q

Bowl assembly retains what?

A

Most of the solids and emulsions

50
Q

Bowl assembly is held to the spindle by what?

A

The spindle cap nut

51
Q

Bowl assembly has annular passages near its center to allow what?

A

To allow seal water to drain to the casing

52
Q

A conical shaped strainer prevents what?

A

Clogging of the drain holes

53
Q

Bowl confines the liquid being separated and contains what?

A
  • paring disc
  • disc stack
  • distributor
  • strainer
  • spindle cap nut
54
Q

Distributor

A

AKA tubular shaft.

- forms a circular bulkhead between the feed inlet and the discharge to the paring disc .

55
Q

The distributor has 3 unequally space raised bosses on the underside which interlock with?

A

3 slots in the bowl shell

56
Q

The unequally spaces raised bosses and and 3 slots in the bowl shell allows what?

A

The tubular shaft to fit in one position only and rotate with the bowl shell

57
Q

The distributor has how many holes near the outside diameter ?

58
Q

Intermediate discs for 300 GPM purifier / 200GPM purifier

A

300GPM has 186 discs

200GPM has 127 discs

59
Q

Each disc has 12 holes which line up with the holes in the what?

A

Distributor ( tubular shaft)

60
Q

Top disc

A

Covers the entire disc stack and forms a pump casing for the paring disc .

  • rotates with disc stack and is wider than disc stack .
  • also has no holes
61
Q

Paring disc

A

Acts as a pump and discharges JP5 from bowl .

  • does not rotate
  • it has a protecting collar made of nylon.
  • it threads onto the feed tube assembly.
62
Q

Bowl top

A

Compressed and keeps the disc stack on the distributor

63
Q

Bowl top houses what?

A

An upper and lower sea ring

64
Q

Bowl top lower ring forms a what?

A

Forms a liquid tight seal between bowl shell and bowl top

65
Q

Bowl top upper ring forms what?

A

Forms a liquid tight seal between the discharge ring and bowl top

66
Q

Coupling ring

A

Locks the bowl top to the bowl shell and screws to the shell.
- it has left handed threads and am indicating arrow to show the direction of rotation for removal.

67
Q

The bowl top and coupling ring each have marks that must be aligned for proper what?

A

Proper disc compression.

This line is called the LOLLIPOPS

68
Q

The coupling ring alignment mark must not pass the bowl top alignment mark by how many inches ?

69
Q

If the coupling ring alignment mark passes the bowl top alignment by more than 4 1/2” this indicates what?

A

It indicates excessive wear of the bowl threads , and this is to personnel and equipment

70
Q

Discharge ring

A

It acts as a dam to maintain a proper line of separation in the bowl

71
Q

How many discharge is the purifiers furnished with ?

A

7 discharge rings

72
Q

Inside diameter of discharge ring varies from how many millimeters and millimeter increments?

A

220-250 millimeters at 5 millimeter increments

73
Q

Coupling nut

A

Locks the discharge ring in place.

-screws onto bowl top and has left handed threads .

74
Q

A/C motor and controller

A
  • motor provides the necessary torque to drive assembly

- magnetic controller is manually operated using start and stop buttons

75
Q

A/C motor is mounted where ?

A

Directly mounted to the base plate of the purifier

76
Q

Start button on the magnetic controller causes the “hold” light to come on, indicating what?

A

Motor winding are energized

77
Q

How long till the “hold” light goes out, and the “run” light to come on?

A

11 1/2 minutes ( +/- 1 minute)

78
Q

Purifier must have a feed pressure and back pressure of how much psi for proper operation?

A

15-25 psi feed pressure
15 minimum back pressure
20psi ideal back pressure
25 psi max back pressure

79
Q

Back pressure must not be below or above how much psi?

A

Not below 15 psi

Not above 35 psi

80
Q

Regulating tube

A

Made of nylon and directs fuel to the center of the tubular shaft( distributor )

81
Q

What kind of maintenance check is done on purifiers?

A

R-37 check.
- 400 +/- 25 hrs.
Unscheduled check , every time we pull into ports we clean purifiers
R- means unscheduled

82
Q

The drive housing and assembly contains what?

A
  • spindle assembly
  • direct drive assembly
  • speed counter
  • brake
  • lubrications system
83
Q

The purifier drive motor rotates at what RPM?

A

1770-1775 RPM

Pump Room (8 decks)

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